1, PANEL (LCD)
2, A / D Driver Board;
3, LCD screen line-drive
4, high-pressure plate (also known as step-up board, high-pressure section, INVERTER)
5, high-pressure plate wire 5, high-pressure plate wire
6, Power adapter (external, generally DC 3A/12V), are also part of the display of the open
Off the power section is built into the machine, the direct input AC220V to Off the power section is built into the machine, the direct input AC220V to
7, VGA cable
8, shell
The following is based on the maintenance of our daily summary of some of the maintenance ideas:
1. Display machine without electricity 1. Display machine without electricity
(1) Power Failure: This is one that should be said to be a very simple failure, the general extension of the liquid crystal display within the power supply and external power supply two kinds of machines, machine outside the common number. (1) Power Failure: This is one that should be said to be a very simple failure, the general extension of the liquid crystal display within the power supply and external power supply two kinds of machines, machine outside the common number. Regardless of the kind of power, its structure is simpler than the crt monitor power supply more, the general vulnerability of some small components, such as insurance, tubes, rectifier bridge .300 V filter capacitor, power switch, power management IC, the output rectifier diodes, filter capacitors. Regardless of the kind of power, its structure is simpler than the crt monitor power supply more, the general vulnerability of some small components, such as insurance, tubes, rectifier bridge .300 V filter capacitor, power switch, power management IC, the output rectifier diodes, filter capacitors.
(2) Drive board failure: The driver board or the insurance regulator chip burn failure, some machines are the built-in switching power supply, the output power two groups, one group is 5V, for signal processing use, another group is 12V panel backlight using high pressure point, if the switching power supply part of the circuit will malfunction could lead to two sets of power supplies do not output. first check whether the 12V voltage is normal, followed by check whether the 5V voltage is normal, because the A / D driver board MCU chip working voltage is 5V, so to find they can not machine failure, the first measurement with the multimeter 5V voltage, if there is no 5V voltage or 5V voltage becomes very low, then a power supply circuit input stage may be a problem, that is 12V converted to 5V power supply part of a problem, this failure is common, check the 5 terminal regulator block (Common Model 8050SD-LM2596-AIC15-01, etc.). (2) Drive board failure: The driver board or the insurance regulator chip burn failure, some machines are the built-in switching power supply, the output power two groups, one group is 5V, for signal processing use, another group is 12V panel backlight using high pressure point, if the switching power supply part of the circuit will malfunction could lead to two sets of power supplies do not output. first check whether the 12V voltage is normal, followed by check whether the 5V voltage is normal, because the A / D driver board MCU chip working voltage is 5V, so to find they can not machine failure, the first measurement with the multimeter 5V voltage, if there is no 5V voltage or 5V voltage becomes very low, then a power supply circuit input stage may be a problem, that is 12V converted to 5V power supply part of a problem, this failure is common, check the 5 terminal regulator block (Common Model 8050SD-LM2596-AIC15-01, etc.).
Another may be the 5V load has increased, the 5V voltage is pulled very low, another way is to say, after the level of signal processing circuit is a problem, there is part of the circuit is damaged, causing the load increased, the 5V voltage is pulled too is very low, one by one to troubleshoot problems after the class components, replace the faulty component, after, 5V able to return to normal, fault generally will be solved, but also frequently encountered 5V voltage is back to normal can not be a normal boot, this situation is more kinds of reasons, on the one hand is the MCU's procedures have been obliterated may lead to boot, there is the MCU itself is damaged, such as MCU's I / O port is damaged, so that MCU can not scan button, encountered such a failure caused by the MCU , find a hardware problem is of no use, even if you change the MCU can not solve problems because MCU is a need for programming and writing code, and in no way to find the original driver board to replace the AD cases, we can only use general-purpose A / D Driver Board substitutions, such as: 151D, or 161B and so on. Another possibility is a 5V load has increased, the 5V voltage is pulled very low, another way is to say, after the level of signal processing circuit is a problem, there is part of the circuit is damaged, causing the load increased, the 5V voltage is pulled too is very low, one by one to troubleshoot problems after the class components, replace the faulty component, after, 5V able to return to normal, fault generally will be solved, but also frequently encountered 5V voltage is back to normal can not be a normal boot, this situation is more kinds of reasons, on the one hand is the MCU's procedures have been obliterated may lead to boot, there is the MCU itself is damaged, such as MCU's I / O port is damaged, so that MCU can not scan button, encountered such a failure caused by the MCU, find a hardware problem is of no use, even if you change the MCU can not solve problems because MCU is a need for programming and writing code, and in no way to find the original driver board to replace the AD cases, we can only use general-purpose A / D Driver Board substitutions, such as: 151D, or 161B and so on.
2. Screen does not look bright light, but the power light green Chang-liang. 2. Screen does not look bright light, but the power light green Chang-liang.
This problem is usually caused by abnormal high pressure is to protect the circuit action, and in this case, there is a general liquid crystal display screen and see approach is "strabismus." This problem is usually caused by abnormal high pressure is to protect the circuit action, and in this case, there is a general liquid crystal display screen and see approach is "strabismus."
Repair method can be used then a single lamp high-voltage panel lamp test, because the present high-pressure liquid crystal display board design are generally symmetrical design, both sides could be essentially bad. Repair method can be used then a single lamp high-voltage panel lamp test, because the present high-pressure liquid crystal display board design are generally symmetrical design, both sides could be essentially bad. In general the old machine is an error-prone road supply pipe, boost tube, step-up transformer and the lamp short-circuit, or no-load, caused by load-balancing power management IC protection. see the pressure plate interface, there are so many lines, many beginners think that change is very complicated, is actually very simple , only four signals can be received a high-voltage plate: 1, power supply. 2, ground. 3, switch control ON / OFF. 4, ADI brightness adjustment. first to identify positive and negative power lines, there is generally fuse positive and negative are mostly connected to the negative terminal of the capacitor. then determine the voltage to determine the best way is to look at voltage capacitors marked, if it is about 3.3V to 6V, 12V or so if the capacitor superscript, then the input voltage is certainly 5V, If it is around 24V or more, it is a 12V, inferior race, and so on, the capacitor on the subject of a few volts divided by 2, the closest is a few volts of several volts. Some people say that by this way then, or it does not shine, or just click on the eradication of the flash, yes, there are many high-pressure shell is the case, then how should we do? identify other foot, take a look at leg better is received on a small transistor is generally taken directly on the receiving transistor , up to the middle of a small capacitor, should be easily identifiable, the control pin is generally 3.3V and 5V, there are also individual is a ground, so we do not know the circumstances, the first ground to try, no longer draw a line 3.3V Then 5V, if the input voltage and control voltage is 3.3V situation is more than can be directly combined. how do the feet of extra å‘€?? let him empty well, not of it. In general the old machine is a way more error -prone power tube, step-up tube, step-up transformer and the lamp short-circuit, or no-load, caused by load-balancing power management IC protection. See the pressure plate interface, there are so many lines, Many beginners think that change is very complicated, is actually very simple and requires only four signals can be received a high-voltage plate: 1, power supply. 2, ground. 3, switch control ON / OFF. 4, ADI brightness adjustment. first determine the power cord positive and negative, with the fuse is generally positive, negative are mostly connected to the negative terminal of the capacitor. then determine the voltage to determine the best way is to look at voltage capacitors marked, if it is a 3.3V to 6V or so, if the capacitor superscript 12V or so, then the input voltage is certainly 5V, If it is around 24V or more, it is a 12V, inferior race, and so on, the capacitor on the subject of a few volts divided by 2, the closest is a few volts of several volts. Some of According to this pick people say, or it does not shine, or just click on the eradication of the flash, yes, there are many high-pressure shell is the case , then how should we do? identify other foot, take a look at leg better is received a small transistor on, usually taken directly on the receiving transistor up to the middle of a small capacitor, should be easily identifiable, the control pin is generally 3.3V and 5V, there are also individual is a ground, so we do not know the circumstances, first ground to try, no 3.3V Afterwards Afterwards 5V, if the input voltage and control voltage is 3.3V situation is more than can be directly combined. how do the feet of extra å‘€?? let him empty well, not of it.
3. Screen black, no backlight. The power light green Chang Liang. 3. Screen black, no backlight. The power light green Chang-liang.
Strabismus LCD screen showing images of mostly high-voltage power supply circuit board problem. Focus on examination of 12V power supply (fuse F), and the switching voltage of 3V or 5V is normal. If it is because there is no MCU problems caused the output switch control voltage can be directly extracted three terminal regulator block (AIC1084) 3.3V instead. the idea of repairing high-voltage board (power switch control tube fuse ---- ---- power management IC ---- ---- push-pull power switch tube made bassoon ---- DA conversion circuit (energy storage inductor, rectifier) --- LC step-up circuit (step-up transformer, step-up capacitive coupling capacitance )------ ---- lamp. Strabismus LCD screen showing images of mostly high-voltage power supply circuit board problem. Focus on examination of 12V power supply (fuse F), and the switching voltage of 3V or 5V is normal. If it is because there is no MCU problems caused the output switch control voltage can be directly extracted three terminal regulator block (AIC1084) 3.3V instead. the idea of repairing high-voltage board (power switch control tube fuse ---- ---- power management IC ---- ---- push - pull power switch tube made bassoon ---- DA conversion circuit (energy storage inductor, rectifier) --- LC step-up circuit (step-up transformer, step-up capacitive coupling capacitance )------ --- - lamp.
4. The screen bright line, bright or dark line with a 4. The screen bright line, bright or dark line with a
This problem, the general failure of the LCD screen. This problem, the general failure of the LCD screen.
Bright-line fault is generally connected LCD screen cable ontology a problem or a particular row and column driver IC is damaged. Bright-line fault is generally connected LCD screen cable ontology a problem or a particular row and column driver IC is damaged.
Dark line is generally screen body has leakage, or the TAB flexible plate connection open. For more than two kinds of problems to the machine is basically a death sentence, and no maintenance of value, because the price of a screen too much. Dark line is generally screen body has leakage, or the TAB flexible plate connection open. For more than two kinds of problems to the machine is basically a death sentence, and no maintenance of value, because the price of a screen too much.
5.black or a white screen
This question is generally screen drive voltage is a problem, the first screen for drive plate and drive-line test, if not do check the screen backplane power supply circuits, repair ideas: Driver board 5V to 3.3V regulator to switch block (AIC1084) is Body of power supply output .--- screen driver board fuse (F) - 3.3V ----- DC-DC converter circuit ---- vacuum to form IC (-7V )---- row, column driver IC . This question is generally screen drive voltage is a problem, the first screen for drive plate and drive-line test, if not do check the screen backplane power supply circuits, repair ideas: Driver board 5V to 3.3V regulator to switch block (AIC1084 ) is Body of power supply output .--- screen driver board fuse (F) - 3.3V ----- DC-DC converter circuit ---- vacuum to form IC (-7V )---- row, column driver IC.
6. Color cast failure
Generally enter the factory adjustment mode to adjust. Generally enter the factory adjustment mode to adjust. If there is no such pattern, repair ideas: replace the screen line and the adapter plate ----- ----- Driver Board rewrite the driver for the bad (not common )----- screen backplane control IC bad (not common )-------- unplug the screen-ray study of backlight color )------- change color as the lamp tube. Without this model, repair ideas: replace the screen line and the adapter plate ----- ----- Driver Board rewrite the driver for the bad (not common )----- screen control IC bad back (not Common) --- ----- unplug the screen-ray study of backlight color ------- change color as the lamp tube.
7. Characters real or tailing 7. Characters real or tailing
Maintenance ideas: Check the VGA signal lines, focusing on RGB three-color look at the ground wire is connected properly ----- replacement screen wire or adapter plate ----- ----- rewrite the driver for Driver Board -- --- LCD screen backplane signal interface IC bad ----- LCD screen back to adjust the contrast potentiometer dislocation ---- ------ LCD screen light guide plate polarizer film dislocation Maintenance ideas: Check the VGA signal lines, focusing on RGB three-color line to see whether the connection is working ----- ground wire or replace the screen adapter plate ----- ----- rewrite the driver for Driver Board - --- LCD screen backplane signal interface IC bad ----- LCD screen back to adjust the contrast potentiometer dislocation ---- ------ LCD screen light guide plate polarizer dislocation
8.LCD stain on the screen within the 8.LCD stain on the screen within the
Maintenance ideas: wipe or replace the protective film ----- open the screen for cleaning the outer body of polarizing film and plexiglass (with cotton balls, pure water) --- hairdryer dry Maintenance ideas: wipe or replace the protective film ----- open the screen for cleaning the outer body of polarizing film and plexiglass (with cotton balls, pure water) --- hairdryer dry
9.LCD screen or light leaked uneven Light leakage or uneven screen lighting 9.LCD
Maintenance ideas: Re-install the lamp to adjust light guide plate ----- Maintenance ideas: Re-install the lamp to adjust light guide plate -----
10: LCD Screen Highlights 10: LCD Screen Highlights
One or two large bright spot, you can try gently pressed with fingertips bright spot may disappear, indicating the switch over for this pixel and electrode virtual connection. Small black point and gray point may be within the light guide plate or a partial rays are caused by dust. washable handle. One or two large bright spot, you can try gently pressed with fingertips bright spot may disappear, indicating the switch over for this pixel and electrode virtual connection. Small black point and gray point may be within the light guide plate or a partial rays are caused by dust. washable handle.
The above method, when the trial first levy customer approval before operation, or else pay the consequences, all responsibility has nothing to do with the author. The above method, when the trial first levy customer approval before operation, or else pay the consequences, all responsibility has nothing to do with the author.
11: LCD screen brightness low-11: LCD screen brightness low
Check the pressure plate ADJ adjust brightness for lamp circuit ---------- -------- -------- for high-pressure plate to adjust or replace the light guide plate Check the pressure plate ADJ adjust brightness for lamp circuit ---------- -------- -------- exchange high-pressure plate to adjust or replace the light guide plate
12: error message "beyond the frequency range" 12: error message "beyond the frequency range"
Check the signal line -------- rewrite MCU driver to replace EPROM ------ ------- ----- rewrite the EPROM program for Driver Board Check the signal line --- ----- rewrite MCU driver to replace EPROM ------ ------- ----- rewrite the EPROM program for Driver Board
13: do not follow after the power switch button that is backlit white screen appears, key display properly after the image 13: do not follow after the power switch button that is backlit white screen appears, key display properly after the image
High-pressure plate interface and the ADJ signal reverse switch signal is caused in part, driven plate MCU switch signal output is not normal, you can rewrite the MCU fixes .------- for MCU High-pressure plate interface and the ADJ signal reverse switch signal is caused in part, driven plate MCU switch signal output is not normal, you can rewrite the MCU for MCU fixes.
LCD Troubleshooting Maintenance
1, PANEL (LCD)
2, A / D Driver Board;
3, LCD screen line-drive
4, high-pressure plate (also known as step-up board, high-pressure section, INVERTER)
5, high-pressure plate wire 5, high-pressure plate wire
6, Power adapter (external, generally DC 3A/12V), are also part of the display of the open
Off the power section is built into the machine, the direct input AC220V to Off the power section is built into the machine, the direct input AC220V to
7, VGA cable
8, shell
The following is based on the maintenance of our daily summary of some of the maintenance ideas:
1. Display machine without electricity 1. Display machine without electricity
(1) Power Failure: This is one that should be said to be a very simple failure, the general extension of the liquid crystal display within the power supply and external power supply two kinds of machines, machine outside the common number. (1) Power Failure: This is one that should be said to be a very simple failure, the general extension of the liquid crystal display within the power supply and external power supply two kinds of machines, machine outside the common number. Regardless of the kind of power, its structure is simpler than the crt monitor power supply more, the general vulnerability of some small components, such as insurance, tubes, rectifier bridge .300 V filter capacitor, power switch, power management IC, the output rectifier diodes, filter capacitors. Regardless of the kind of power, its structure is simpler than the crt monitor power supply more, the general vulnerability of some small components, such as insurance, tubes, rectifier bridge .300 V filter capacitor, power switch, power management IC, the output rectifier diodes, filter capacitors.
(2) Drive board failure: The driver board or the insurance regulator chip burn failure, some machines are the built-in switching power supply, the output power two groups, one group is 5V, for signal processing use, another group is 12V panel backlight using high pressure point, if the switching power supply part of the circuit will malfunction could lead to two sets of power supplies do not output. first check whether the 12V voltage is normal, followed by check whether the 5V voltage is normal, because the A / D driver board MCU chip working voltage is 5V, so to find they can not machine failure, the first measurement with the multimeter 5V voltage, if there is no 5V voltage or 5V voltage becomes very low, then a power supply circuit input stage may be a problem, that is 12V converted to 5V power supply part of a problem, this failure is common, check the 5 terminal regulator block (Common Model 8050SD-LM2596-AIC15-01, etc.). (2) Drive board failure: The driver board or the insurance regulator chip burn failure, some machines are the built-in switching power supply, the output power two groups, one group is 5V, for signal processing use, another group is 12V panel backlight using high pressure point, if the switching power supply part of the circuit will malfunction could lead to two sets of power supplies do not output. first check whether the 12V voltage is normal, followed by check whether the 5V voltage is normal, because the A / D driver board MCU chip working voltage is 5V, so to find they can not machine failure, the first measurement with the multimeter 5V voltage, if there is no 5V voltage or 5V voltage becomes very low, then a power supply circuit input stage may be a problem, that is 12V converted to 5V power supply part of a problem, this failure is common, check the 5 terminal regulator block (Common Model 8050SD-LM2596-AIC15-01, etc.).
Another may be the 5V load has increased, the 5V voltage is pulled very low, another way is to say, after the level of signal processing circuit is a problem, there is part of the circuit is damaged, causing the load increased, the 5V voltage is pulled too is very low, one by one to troubleshoot problems after the class components, replace the faulty component, after, 5V able to return to normal, fault generally will be solved, but also frequently encountered 5V voltage is back to normal can not be a normal boot, this situation is more kinds of reasons, on the one hand is the MCU's procedures have been obliterated may lead to boot, there is the MCU itself is damaged, such as MCU's I / O port is damaged, so that MCU can not scan button, encountered such a failure caused by the MCU , find a hardware problem is of no use, even if you change the MCU can not solve problems because MCU is a need for programming and writing code, and in no way to find the original driver board to replace the AD cases, we can only use general-purpose A / D Driver Board substitutions, such as: 151D, or 161B and so on. Another possibility is a 5V load has increased, the 5V voltage is pulled very low, another way is to say, after the level of signal processing circuit is a problem, there is part of the circuit is damaged, causing the load increased, the 5V voltage is pulled too is very low, one by one to troubleshoot problems after the class components, replace the faulty component, after, 5V able to return to normal, fault generally will be solved, but also frequently encountered 5V voltage is back to normal can not be a normal boot, this situation is more kinds of reasons, on the one hand is the MCU's procedures have been obliterated may lead to boot, there is the MCU itself is damaged, such as MCU's I / O port is damaged, so that MCU can not scan button, encountered such a failure caused by the MCU, find a hardware problem is of no use, even if you change the MCU can not solve problems because MCU is a need for programming and writing code, and in no way to find the original driver board to replace the AD cases, we can only use general-purpose A / D Driver Board substitutions, such as: 151D, or 161B and so on.
2. Screen does not look bright light, but the power light green Chang-liang. 2. Screen does not look bright light, but the power light green Chang-liang.
This problem is usually caused by abnormal high pressure is to protect the circuit action, and in this case, there is a general liquid crystal display screen and see approach is "strabismus." This problem is usually caused by abnormal high pressure is to protect the circuit action, and in this case, there is a general liquid crystal display screen and see approach is "strabismus."
Repair method can be used then a single lamp high-voltage panel lamp test, because the present high-pressure liquid crystal display board design are generally symmetrical design, both sides could be essentially bad. Repair method can be used then a single lamp high-voltage panel lamp test, because the present high-pressure liquid crystal display board design are generally symmetrical design, both sides could be essentially bad. In general the old machine is an error-prone road supply pipe, boost tube, step-up transformer and the lamp short-circuit, or no-load, caused by load-balancing power management IC protection. see the pressure plate interface, there are so many lines, many beginners think that change is very complicated, is actually very simple , only four signals can be received a high-voltage plate: 1, power supply. 2, ground. 3, switch control ON / OFF. 4, ADI brightness adjustment. first to identify positive and negative power lines, there is generally fuse positive and negative are mostly connected to the negative terminal of the capacitor. then determine the voltage to determine the best way is to look at voltage capacitors marked, if it is about 3.3V to 6V, 12V or so if the capacitor superscript, then the input voltage is certainly 5V, If it is around 24V or more, it is a 12V, inferior race, and so on, the capacitor on the subject of a few volts divided by 2, the closest is a few volts of several volts. Some people say that by this way then, or it does not shine, or just click on the eradication of the flash, yes, there are many high-pressure shell is the case, then how should we do? identify other foot, take a look at leg better is received on a small transistor is generally taken directly on the receiving transistor , up to the middle of a small capacitor, should be easily identifiable, the control pin is generally 3.3V and 5V, there are also individual is a ground, so we do not know the circumstances, the first ground to try, no longer draw a line 3.3V Then 5V, if the input voltage and control voltage is 3.3V situation is more than can be directly combined. how do the feet of extra å‘€?? let him empty well, not of it. In general the old machine is a way more error -prone power tube, step-up tube, step-up transformer and the lamp short-circuit, or no-load, caused by load-balancing power management IC protection. See the pressure plate interface, there are so many lines, Many beginners think that change is very complicated, is actually very simple and requires only four signals can be received a high-voltage plate: 1, power supply. 2, ground. 3, switch control ON / OFF. 4, ADI brightness adjustment. first determine the power cord positive and negative, with the fuse is generally positive, negative are mostly connected to the negative terminal of the capacitor. then determine the voltage to determine the best way is to look at voltage capacitors marked, if it is a 3.3V to 6V or so, if the capacitor superscript 12V or so, then the input voltage is certainly 5V, If it is around 24V or more, it is a 12V, inferior race, and so on, the capacitor on the subject of a few volts divided by 2, the closest is a few volts of several volts. Some of According to this pick people say, or it does not shine, or just click on the eradication of the flash, yes, there are many high-pressure shell is the case , then how should we do? identify other foot, take a look at leg better is received a small transistor on, usually taken directly on the receiving transistor up to the middle of a small capacitor, should be easily identifiable, the control pin is generally 3.3V and 5V, there are also individual is a ground, so we do not know the circumstances, first ground to try, no 3.3V Afterwards Afterwards 5V, if the input voltage and control voltage is 3.3V situation is more than can be directly combined. how do the feet of extra å‘€?? let him empty well, not of it.
3. Screen black, no backlight. The power light green Chang Liang. 3. Screen black, no backlight. The power light green Chang-liang.
Strabismus LCD screen showing images of mostly high-voltage power supply circuit board problem. Focus on examination of 12V power supply (fuse F), and the switching voltage of 3V or 5V is normal. If it is because there is no MCU problems caused the output switch control voltage can be directly extracted three terminal regulator block (AIC1084) 3.3V instead. the idea of repairing high-voltage board (power switch control tube fuse ---- ---- power management IC ---- ---- push-pull power switch tube made bassoon ---- DA conversion circuit (energy storage inductor, rectifier) --- LC step-up circuit (step-up transformer, step-up capacitive coupling capacitance )------ ---- lamp. Strabismus LCD screen showing images of mostly high-voltage power supply circuit board problem. Focus on examination of 12V power supply (fuse F), and the switching voltage of 3V or 5V is normal. If it is because there is no MCU problems caused the output switch control voltage can be directly extracted three terminal regulator block (AIC1084) 3.3V instead. the idea of repairing high-voltage board (power switch control tube fuse ---- ---- power management IC ---- ---- push - pull power switch tube made bassoon ---- DA conversion circuit (energy storage inductor, rectifier) --- LC step-up circuit (step-up transformer, step-up capacitive coupling capacitance )------ --- - lamp.
4. The screen bright line, bright or dark line with a 4. The screen bright line, bright or dark line with a
This problem, the general failure of the LCD screen. This problem, the general failure of the LCD screen.
Bright-line fault is generally connected LCD screen cable ontology a problem or a particular row and column driver IC is damaged. Bright-line fault is generally connected LCD screen cable ontology a problem or a particular row and column driver IC is damaged.
Dark line is generally screen body has leakage, or the TAB flexible plate connection open. For more than two kinds of problems to the machine is basically a death sentence, and no maintenance of value, because the price of a screen too much. Dark line is generally screen body has leakage, or the TAB flexible plate connection open. For more than two kinds of problems to the machine is basically a death sentence, and no maintenance of value, because the price of a screen too much.
5.black or a white screen
This question is generally screen drive voltage is a problem, the first screen for drive plate and drive-line test, if not do check the screen backplane power supply circuits, repair ideas: Driver board 5V to 3.3V regulator to switch block (AIC1084) is Body of power supply output .--- screen driver board fuse (F) - 3.3V ----- DC-DC converter circuit ---- vacuum to form IC (-7V )---- row, column driver IC . This question is generally screen drive voltage is a problem, the first screen for drive plate and drive-line test, if not do check the screen backplane power supply circuits, repair ideas: Driver board 5V to 3.3V regulator to switch block (AIC1084 ) is Body of power supply output .--- screen driver board fuse (F) - 3.3V ----- DC-DC converter circuit ---- vacuum to form IC (-7V )---- row, column driver IC.
6. Color cast failure
Generally enter the factory adjustment mode to adjust. Generally enter the factory adjustment mode to adjust. If there is no such pattern, repair ideas: replace the screen line and the adapter plate ----- ----- Driver Board rewrite the driver for the bad (not common )----- screen backplane control IC bad (not common )-------- unplug the screen-ray study of backlight color )------- change color as the lamp tube. Without this model, repair ideas: replace the screen line and the adapter plate ----- ----- Driver Board rewrite the driver for the bad (not common )----- screen control IC bad back (not Common) --- ----- unplug the screen-ray study of backlight color ------- change color as the lamp tube.
7. Characters real or tailing 7. Characters real or tailing
Maintenance ideas: Check the VGA signal lines, focusing on RGB three-color look at the ground wire is connected properly ----- replacement screen wire or adapter plate ----- ----- rewrite the driver for Driver Board -- --- LCD screen backplane signal interface IC bad ----- LCD screen back to adjust the contrast potentiometer dislocation ---- ------ LCD screen light guide plate polarizer film dislocation Maintenance ideas: Check the VGA signal lines, focusing on RGB three-color line to see whether the connection is working ----- ground wire or replace the screen adapter plate ----- ----- rewrite the driver for Driver Board - --- LCD screen backplane signal interface IC bad ----- LCD screen back to adjust the contrast potentiometer dislocation ---- ------ LCD screen light guide plate polarizer dislocation
8.LCD stain on the screen within the 8.LCD stain on the screen within the
Maintenance ideas: wipe or replace the protective film ----- open the screen for cleaning the outer body of polarizing film and plexiglass (with cotton balls, pure water) --- hairdryer dry Maintenance ideas: wipe or replace the protective film ----- open the screen for cleaning the outer body of polarizing film and plexiglass (with cotton balls, pure water) --- hairdryer dry
9.LCD screen or light leaked uneven Light leakage or uneven screen lighting 9.LCD
Maintenance ideas: Re-install the lamp to adjust light guide plate ----- Maintenance ideas: Re-install the lamp to adjust light guide plate -----
10: LCD Screen Highlights 10: LCD Screen Highlights
One or two large bright spot, you can try gently pressed with fingertips bright spot may disappear, indicating the switch over for this pixel and electrode virtual connection. Small black point and gray point may be within the light guide plate or a partial rays are caused by dust. washable handle. One or two large bright spot, you can try gently pressed with fingertips bright spot may disappear, indicating the switch over for this pixel and electrode virtual connection. Small black point and gray point may be within the light guide plate or a partial rays are caused by dust. washable handle.
The above method, when the trial first levy customer approval before operation, or else pay the consequences, all responsibility has nothing to do with the author. The above method, when the trial first levy customer approval before operation, or else pay the consequences, all responsibility has nothing to do with the author.
11: LCD screen brightness low-11: LCD screen brightness low
Check the pressure plate ADJ adjust brightness for lamp circuit ---------- -------- -------- for high-pressure plate to adjust or replace the light guide plate Check the pressure plate ADJ adjust brightness for lamp circuit ---------- -------- -------- exchange high-pressure plate to adjust or replace the light guide plate
12: error message "beyond the frequency range" 12: error message "beyond the frequency range"
Check the signal line -------- rewrite MCU driver to replace EPROM ------ ------- ----- rewrite the EPROM program for Driver Board Check the signal line --- ----- rewrite MCU driver to replace EPROM ------ ------- ----- rewrite the EPROM program for Driver Board
13: do not follow after the power switch button that is backlit white screen appears, key display properly after the image 13: do not follow after the power switch button that is backlit white screen appears, key display properly after the image
High-pressure plate interface and the ADJ signal reverse switch signal is caused in part, driven plate MCU switch signal output is not normal, you can rewrite the MCU fixes .------- for MCU High-pressure plate interface and the ADJ signal reverse switch signal is caused in part, driven plate MCU switch signal output is not normal, you can rewrite the MCU for MCU fixes.
2, A / D Driver Board;
3, LCD screen line-drive
4, high-pressure plate (also known as step-up board, high-pressure section, INVERTER)
5, high-pressure plate wire 5, high-pressure plate wire
6, Power adapter (external, generally DC 3A/12V), are also part of the display of the open
Off the power section is built into the machine, the direct input AC220V to Off the power section is built into the machine, the direct input AC220V to
7, VGA cable
8, shell
The following is based on the maintenance of our daily summary of some of the maintenance ideas:
1. Display machine without electricity 1. Display machine without electricity
(1) Power Failure: This is one that should be said to be a very simple failure, the general extension of the liquid crystal display within the power supply and external power supply two kinds of machines, machine outside the common number. (1) Power Failure: This is one that should be said to be a very simple failure, the general extension of the liquid crystal display within the power supply and external power supply two kinds of machines, machine outside the common number. Regardless of the kind of power, its structure is simpler than the crt monitor power supply more, the general vulnerability of some small components, such as insurance, tubes, rectifier bridge .300 V filter capacitor, power switch, power management IC, the output rectifier diodes, filter capacitors. Regardless of the kind of power, its structure is simpler than the crt monitor power supply more, the general vulnerability of some small components, such as insurance, tubes, rectifier bridge .300 V filter capacitor, power switch, power management IC, the output rectifier diodes, filter capacitors.
(2) Drive board failure: The driver board or the insurance regulator chip burn failure, some machines are the built-in switching power supply, the output power two groups, one group is 5V, for signal processing use, another group is 12V panel backlight using high pressure point, if the switching power supply part of the circuit will malfunction could lead to two sets of power supplies do not output. first check whether the 12V voltage is normal, followed by check whether the 5V voltage is normal, because the A / D driver board MCU chip working voltage is 5V, so to find they can not machine failure, the first measurement with the multimeter 5V voltage, if there is no 5V voltage or 5V voltage becomes very low, then a power supply circuit input stage may be a problem, that is 12V converted to 5V power supply part of a problem, this failure is common, check the 5 terminal regulator block (Common Model 8050SD-LM2596-AIC15-01, etc.). (2) Drive board failure: The driver board or the insurance regulator chip burn failure, some machines are the built-in switching power supply, the output power two groups, one group is 5V, for signal processing use, another group is 12V panel backlight using high pressure point, if the switching power supply part of the circuit will malfunction could lead to two sets of power supplies do not output. first check whether the 12V voltage is normal, followed by check whether the 5V voltage is normal, because the A / D driver board MCU chip working voltage is 5V, so to find they can not machine failure, the first measurement with the multimeter 5V voltage, if there is no 5V voltage or 5V voltage becomes very low, then a power supply circuit input stage may be a problem, that is 12V converted to 5V power supply part of a problem, this failure is common, check the 5 terminal regulator block (Common Model 8050SD-LM2596-AIC15-01, etc.).
Another may be the 5V load has increased, the 5V voltage is pulled very low, another way is to say, after the level of signal processing circuit is a problem, there is part of the circuit is damaged, causing the load increased, the 5V voltage is pulled too is very low, one by one to troubleshoot problems after the class components, replace the faulty component, after, 5V able to return to normal, fault generally will be solved, but also frequently encountered 5V voltage is back to normal can not be a normal boot, this situation is more kinds of reasons, on the one hand is the MCU's procedures have been obliterated may lead to boot, there is the MCU itself is damaged, such as MCU's I / O port is damaged, so that MCU can not scan button, encountered such a failure caused by the MCU , find a hardware problem is of no use, even if you change the MCU can not solve problems because MCU is a need for programming and writing code, and in no way to find the original driver board to replace the AD cases, we can only use general-purpose A / D Driver Board substitutions, such as: 151D, or 161B and so on. Another possibility is a 5V load has increased, the 5V voltage is pulled very low, another way is to say, after the level of signal processing circuit is a problem, there is part of the circuit is damaged, causing the load increased, the 5V voltage is pulled too is very low, one by one to troubleshoot problems after the class components, replace the faulty component, after, 5V able to return to normal, fault generally will be solved, but also frequently encountered 5V voltage is back to normal can not be a normal boot, this situation is more kinds of reasons, on the one hand is the MCU's procedures have been obliterated may lead to boot, there is the MCU itself is damaged, such as MCU's I / O port is damaged, so that MCU can not scan button, encountered such a failure caused by the MCU, find a hardware problem is of no use, even if you change the MCU can not solve problems because MCU is a need for programming and writing code, and in no way to find the original driver board to replace the AD cases, we can only use general-purpose A / D Driver Board substitutions, such as: 151D, or 161B and so on.
2. Screen does not look bright light, but the power light green Chang-liang. 2. Screen does not look bright light, but the power light green Chang-liang.
This problem is usually caused by abnormal high pressure is to protect the circuit action, and in this case, there is a general liquid crystal display screen and see approach is "strabismus." This problem is usually caused by abnormal high pressure is to protect the circuit action, and in this case, there is a general liquid crystal display screen and see approach is "strabismus."
Repair method can be used then a single lamp high-voltage panel lamp test, because the present high-pressure liquid crystal display board design are generally symmetrical design, both sides could be essentially bad. Repair method can be used then a single lamp high-voltage panel lamp test, because the present high-pressure liquid crystal display board design are generally symmetrical design, both sides could be essentially bad. In general the old machine is an error-prone road supply pipe, boost tube, step-up transformer and the lamp short-circuit, or no-load, caused by load-balancing power management IC protection. see the pressure plate interface, there are so many lines, many beginners think that change is very complicated, is actually very simple , only four signals can be received a high-voltage plate: 1, power supply. 2, ground. 3, switch control ON / OFF. 4, ADI brightness adjustment. first to identify positive and negative power lines, there is generally fuse positive and negative are mostly connected to the negative terminal of the capacitor. then determine the voltage to determine the best way is to look at voltage capacitors marked, if it is about 3.3V to 6V, 12V or so if the capacitor superscript, then the input voltage is certainly 5V, If it is around 24V or more, it is a 12V, inferior race, and so on, the capacitor on the subject of a few volts divided by 2, the closest is a few volts of several volts. Some people say that by this way then, or it does not shine, or just click on the eradication of the flash, yes, there are many high-pressure shell is the case, then how should we do? identify other foot, take a look at leg better is received on a small transistor is generally taken directly on the receiving transistor , up to the middle of a small capacitor, should be easily identifiable, the control pin is generally 3.3V and 5V, there are also individual is a ground, so we do not know the circumstances, the first ground to try, no longer draw a line 3.3V Then 5V, if the input voltage and control voltage is 3.3V situation is more than can be directly combined. how do the feet of extra å‘€?? let him empty well, not of it. In general the old machine is a way more error -prone power tube, step-up tube, step-up transformer and the lamp short-circuit, or no-load, caused by load-balancing power management IC protection. See the pressure plate interface, there are so many lines, Many beginners think that change is very complicated, is actually very simple and requires only four signals can be received a high-voltage plate: 1, power supply. 2, ground. 3, switch control ON / OFF. 4, ADI brightness adjustment. first determine the power cord positive and negative, with the fuse is generally positive, negative are mostly connected to the negative terminal of the capacitor. then determine the voltage to determine the best way is to look at voltage capacitors marked, if it is a 3.3V to 6V or so, if the capacitor superscript 12V or so, then the input voltage is certainly 5V, If it is around 24V or more, it is a 12V, inferior race, and so on, the capacitor on the subject of a few volts divided by 2, the closest is a few volts of several volts. Some of According to this pick people say, or it does not shine, or just click on the eradication of the flash, yes, there are many high-pressure shell is the case , then how should we do? identify other foot, take a look at leg better is received a small transistor on, usually taken directly on the receiving transistor up to the middle of a small capacitor, should be easily identifiable, the control pin is generally 3.3V and 5V, there are also individual is a ground, so we do not know the circumstances, first ground to try, no 3.3V Afterwards Afterwards 5V, if the input voltage and control voltage is 3.3V situation is more than can be directly combined. how do the feet of extra å‘€?? let him empty well, not of it.
3. Screen black, no backlight. The power light green Chang Liang. 3. Screen black, no backlight. The power light green Chang-liang.
Strabismus LCD screen showing images of mostly high-voltage power supply circuit board problem. Focus on examination of 12V power supply (fuse F), and the switching voltage of 3V or 5V is normal. If it is because there is no MCU problems caused the output switch control voltage can be directly extracted three terminal regulator block (AIC1084) 3.3V instead. the idea of repairing high-voltage board (power switch control tube fuse ---- ---- power management IC ---- ---- push-pull power switch tube made bassoon ---- DA conversion circuit (energy storage inductor, rectifier) --- LC step-up circuit (step-up transformer, step-up capacitive coupling capacitance )------ ---- lamp. Strabismus LCD screen showing images of mostly high-voltage power supply circuit board problem. Focus on examination of 12V power supply (fuse F), and the switching voltage of 3V or 5V is normal. If it is because there is no MCU problems caused the output switch control voltage can be directly extracted three terminal regulator block (AIC1084) 3.3V instead. the idea of repairing high-voltage board (power switch control tube fuse ---- ---- power management IC ---- ---- push - pull power switch tube made bassoon ---- DA conversion circuit (energy storage inductor, rectifier) --- LC step-up circuit (step-up transformer, step-up capacitive coupling capacitance )------ --- - lamp.
4. The screen bright line, bright or dark line with a 4. The screen bright line, bright or dark line with a
This problem, the general failure of the LCD screen. This problem, the general failure of the LCD screen.
Bright-line fault is generally connected LCD screen cable ontology a problem or a particular row and column driver IC is damaged. Bright-line fault is generally connected LCD screen cable ontology a problem or a particular row and column driver IC is damaged.
Dark line is generally screen body has leakage, or the TAB flexible plate connection open. For more than two kinds of problems to the machine is basically a death sentence, and no maintenance of value, because the price of a screen too much. Dark line is generally screen body has leakage, or the TAB flexible plate connection open. For more than two kinds of problems to the machine is basically a death sentence, and no maintenance of value, because the price of a screen too much.
5.black or a white screen
This question is generally screen drive voltage is a problem, the first screen for drive plate and drive-line test, if not do check the screen backplane power supply circuits, repair ideas: Driver board 5V to 3.3V regulator to switch block (AIC1084) is Body of power supply output .--- screen driver board fuse (F) - 3.3V ----- DC-DC converter circuit ---- vacuum to form IC (-7V )---- row, column driver IC . This question is generally screen drive voltage is a problem, the first screen for drive plate and drive-line test, if not do check the screen backplane power supply circuits, repair ideas: Driver board 5V to 3.3V regulator to switch block (AIC1084 ) is Body of power supply output .--- screen driver board fuse (F) - 3.3V ----- DC-DC converter circuit ---- vacuum to form IC (-7V )---- row, column driver IC.
6. Color cast failure
Generally enter the factory adjustment mode to adjust. Generally enter the factory adjustment mode to adjust. If there is no such pattern, repair ideas: replace the screen line and the adapter plate ----- ----- Driver Board rewrite the driver for the bad (not common )----- screen backplane control IC bad (not common )-------- unplug the screen-ray study of backlight color )------- change color as the lamp tube. Without this model, repair ideas: replace the screen line and the adapter plate ----- ----- Driver Board rewrite the driver for the bad (not common )----- screen control IC bad back (not Common) --- ----- unplug the screen-ray study of backlight color ------- change color as the lamp tube.
7. Characters real or tailing 7. Characters real or tailing
Maintenance ideas: Check the VGA signal lines, focusing on RGB three-color look at the ground wire is connected properly ----- replacement screen wire or adapter plate ----- ----- rewrite the driver for Driver Board -- --- LCD screen backplane signal interface IC bad ----- LCD screen back to adjust the contrast potentiometer dislocation ---- ------ LCD screen light guide plate polarizer film dislocation Maintenance ideas: Check the VGA signal lines, focusing on RGB three-color line to see whether the connection is working ----- ground wire or replace the screen adapter plate ----- ----- rewrite the driver for Driver Board - --- LCD screen backplane signal interface IC bad ----- LCD screen back to adjust the contrast potentiometer dislocation ---- ------ LCD screen light guide plate polarizer dislocation
8.LCD stain on the screen within the 8.LCD stain on the screen within the
Maintenance ideas: wipe or replace the protective film ----- open the screen for cleaning the outer body of polarizing film and plexiglass (with cotton balls, pure water) --- hairdryer dry Maintenance ideas: wipe or replace the protective film ----- open the screen for cleaning the outer body of polarizing film and plexiglass (with cotton balls, pure water) --- hairdryer dry
9.LCD screen or light leaked uneven Light leakage or uneven screen lighting 9.LCD
Maintenance ideas: Re-install the lamp to adjust light guide plate ----- Maintenance ideas: Re-install the lamp to adjust light guide plate -----
10: LCD Screen Highlights 10: LCD Screen Highlights
One or two large bright spot, you can try gently pressed with fingertips bright spot may disappear, indicating the switch over for this pixel and electrode virtual connection. Small black point and gray point may be within the light guide plate or a partial rays are caused by dust. washable handle. One or two large bright spot, you can try gently pressed with fingertips bright spot may disappear, indicating the switch over for this pixel and electrode virtual connection. Small black point and gray point may be within the light guide plate or a partial rays are caused by dust. washable handle.
The above method, when the trial first levy customer approval before operation, or else pay the consequences, all responsibility has nothing to do with the author. The above method, when the trial first levy customer approval before operation, or else pay the consequences, all responsibility has nothing to do with the author.
11: LCD screen brightness low-11: LCD screen brightness low
Check the pressure plate ADJ adjust brightness for lamp circuit ---------- -------- -------- for high-pressure plate to adjust or replace the light guide plate Check the pressure plate ADJ adjust brightness for lamp circuit ---------- -------- -------- exchange high-pressure plate to adjust or replace the light guide plate
12: error message "beyond the frequency range" 12: error message "beyond the frequency range"
Check the signal line -------- rewrite MCU driver to replace EPROM ------ ------- ----- rewrite the EPROM program for Driver Board Check the signal line --- ----- rewrite MCU driver to replace EPROM ------ ------- ----- rewrite the EPROM program for Driver Board
13: do not follow after the power switch button that is backlit white screen appears, key display properly after the image 13: do not follow after the power switch button that is backlit white screen appears, key display properly after the image
High-pressure plate interface and the ADJ signal reverse switch signal is caused in part, driven plate MCU switch signal output is not normal, you can rewrite the MCU fixes .------- for MCU High-pressure plate interface and the ADJ signal reverse switch signal is caused in part, driven plate MCU switch signal output is not normal, you can rewrite the MCU for MCU fixes.
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