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Motherboard routine maintenance of 23 cases

Today, more and more integrated motherboard, motherboard repair has become increasingly difficult, often using specialized digital testing equipment to complete. However, some motherboards do not require specialized common faults detection equipment, your own hands can be resolved, following are some of the most typical example of a motherboard failure repair and hope that everyone will learn the basic approach to solve the motherboard failure.



First, boot no display type fault

【Example 1】: motherboard does not start, boot-free shows that the memory alarm sound ( "Didi" to call a non-stop)

Cause of the malfunction: Memory alarm failure is more common, is mainly caused by poor contact of memory. For example, non-standard memory, the memory of a bit thin, when the memory into the memory slot, leaving some gaps; memory of the finger technique is poor, the surface of gold-plated cheat poor over time, Finger surface oxide layer gradually thickened, leading to poor contact memory; memory slot of poor quality, reed contact with the memory of the finger is not really so.

Approach: Open box, with rubber carefully wipe the memory clean of the finger to get down and re-insert memory look, with hot melt adhesive to the memory slots on both sides of the gap filled to prevent oxidation of the use of the process to continue. Note: In-swappable memory be sure to unplug the power cord off the host, to prevent accidental burning of the memory.

【Example 2】: motherboard does not start, boot no display, there are graphics alarm sound (a long two short tweet)

Cause of the malfunction: Normally, graphics card loose or damaged. Approach: Open box, put a good graphics card can be re-inserted. To check the AGP slot if there were a small foreign body, otherwise it would be graphics card will not plug in place; the board for the use of voice alarm should be careful to distinguish the contents of the voice prompts, and then solve the corresponding failure based on content.

If the above approach even after the police, it could be bad graphics chips, and replace or repair card. If the boot after the hear "tick," gave the self-test passed, but that did not display the normal image, put the card inserted in the other motherboard, use the normal, that is, graphics are not compatible with the motherboard, graphics card should be replaced.







【Example 3】: motherboard does not start, boot no display, no alarm sound

Failure reason: There are many reasons, mainly the following.

Approach: For the following reasons, one by one to exclude. Ask you are familiar with digital circuit analog circuit, will use the multimeter, and sometimes also need to check with DEBUG card failure.

(1) CPU issues

CPU no electricity: multimeter test CPU can be used around the three (or a) field pipe and three (or a) rectifier diode, check the CPU for damage.

CPU socket pins are missing or loose: the performance of such failures as the point does not light or non-crash. Need to open the surface of the superstructure of the CPU socket, carefully observe with your eyes whether the deformation of the pin.

CPU fan socket fixed clamp fracture: You can consider the use of other fixation methods, generally do not replace the CPU socket, because the left hand soldering easier to hidden failures. SOCKET370 of the CPU, its fixed the radiator through the CPU sockets, if the fixed leaf spring too tight, demolition must be careful when, otherwise it will cause a plastic clamp fracture, there is no way a fixed CPU fan.

CPU frequency CMOS settings wrong inside: as long as you can clear the CMOS to solve. Clear CMOS jumper on the motherboard in general vicinity of the lithium batteries, its default location is generally 1,2 short, as long as its changed for the 2,3-short jump a few seconds you can solve the problem, for the previous old motherboard, such as the finding does not to the jumper, as long as the battery removed, to be displayed into the CMOS settings and then boot off the battery to install up will also allow CMOS discharge.

(2) motherboard expansion slot or an expansion card problem

Because the motherboard or expansion card expansion slot problems, leading to plug in graphics cards, sound cards and other expansion cards, the motherboard does not respond, thus creating a boot no display. For example, brute-force disassembly AGP graphics card, resulting in cracking AGP slot, you can cause such failures.

(3) memory problems

Motherboard does not recognize the memory, memory corruption or memory does not match: Some older motherboards more selective memory, once the plug in the motherboard does not recognize the memory, motherboards, will not start, and even some motherboards do not fault tips (tweet). In addition, if the plug in different brands, types of memory, and sometimes lead to such failures.

Memory slots Broken Needle or burning: sometimes because of excessive force or improper installation method will cause deformation of the memory slot of the spring break, so that the memory slot scrapped. Note: Plug memory should be the vertical force, do not shake around. In the swap memory before the host must unplug the power to prevent the use of STR function, memory, live, burning memory. In addition, do not install anti-memory, and to avoid power-up and burned in memory. But now the motherboard, generally foolproof will be designed to insert anti-.

(4) The motherboard BIOS is damaged

The motherboard BIOS the hardware store important data, while the motherboard BIOS is the more vulnerable parts susceptible to damage, once damaged it will cause the system to not run.

Such failures usually occur because the motherboard BIOS has been caused by CIH virus attack. In general after the virus destroyed BIOS, hard disk where data will be all lost, you can detect the hard disk data is intact, in order to determine whether the BIOS has been damaged; in a time when DEBUG card can also be through the BIOS on the card indicator light to determine whether the . When the BIOS, BOOT block has not been destroyed, start after the display does not shine, PC speakers have "toot" sound the alarm; if BOOT is damaged, then, after power on, power supply and hard disk lights, CPU fan turn, but it does not start at this time only through the programmer to rewrite the BIOS.

You can also plug in ISA card, see if there is displayed (if prompted, can prompt steps below.), If there is no boot screen, you can even act as an automatic update BIOS, floppy disk, re-update BIOS, but there are The motherboard BIOS is damaged, the floppy drive simply does not work, at this time recommend to service providers, device will be used to write code to write BIOS in the BIOS update file.

(5) CMOS battery problem using the

Press the power switch, hard drive and power lights, CPU fan turn, but the host does not start. When, after removing the battery, you can start normally.

(6) The board automatically protect lock

Some motherboard with automatic detection protection function, when the power supply voltage is abnormal, or CPU overclocking, adjusting the voltage is too high occurs, will automatically lock to stop working. Performance is what the board does not start, then the CMOS after discharge may be combined with electric start, and some motherboards need to board the power to open, hold down the RESET key to unlock it.

(7) capacitors on the motherboard is damaged

Check the capacitors on the motherboard, or whether the bubble burst. When the capacitor voltage is too high or because of long high temperature BBQ will bubble or drip fluid, when the capacity of capacitance decrease or loss of capacity, capacitance will lose filtering function, the provision of load current to increase the exchange of components , resulting in CPU, memory, and the relevant board job insecurity, manifested as easy to hang or system instability, often a blue screen.

【Example 4】: motherboard temperature control disorders, leading to boot no display

ASUS P3B-F motherboard can monitor the CPU temperature, using a temperature monitoring 2Pin lines, inserted in the CPU slot beside the pins on the JTP. Later, in the course of time playing the game, the machine suddenly a blue screen, reboot, wait until the CD-ROM, hard disk self-test does not actually exhausted display bright.

Failure reason: connected to the motherboard's temperature-controlled off-line, off the motherboard, causing the motherboard automatically protect the state, refused to increase power. As the CPU heat is very large, many motherboards offer a strict temperature control and protection devices. General CPU temperature is too high, or on the motherboard temperature monitoring system fails, the motherboard will automatically enter the protection. Refuse to power-start, or alarm.

Approach: Re-connecting the temperature control cable, and then you can boot. Note that if your motherboard does not start properly or alarm, you should first check the motherboard temperature monitoring devices are normal.

2, CMOS type fault

【5】 examples: Computer frequently crashes, conducting crash CMOS settings will appear the phenomenon of

Cause of the malfunction: is generally bad or motherboard motherboard design thermal problem caused by Cache.

Approach: If the heat is not good enough because of the motherboard caused the failure, you can touch the CPU after the crash around the motherboard components, you will find that the temperature is very hot, in the replacement of high-power fans, the crash failure can be resolved.

If it is a problem caused by Cache, you can enter the CMOS settings, immediately after the Cache prohibited. Of course, Cache ban, the machine speed would certainly be affected. If the fault can not be resolved according to the law, it is motherboard or CPU have problems, only to replace the motherboard or CPU.

【6】 examples: CMOS parameters of the loss, after the boot prompt "CMOS Battery State Low", and sometimes you can start to use some time after the crash.

Cause of the malfunction: This phenomenon mostly due to power shortages in CMOS.

Approach: If it is welded battery, you can re-power soldering iron can be welded on a new battery; if it is button-type battery can be replaced; if it is chip-type battery, you can replace the chip, preferably in the same type chip replacement.

If you replace the battery, the time is not long, suffers from a similar phenomenon, it is likely to be board leakage, you can check the diodes, or capacitors on the motherboard is damaged, you can also use an external battery jumper.

【7】 examples: CMOS settings can not be saved

Cause of the malfunction: is generally caused due to lack of motherboard battery approach: replacement of the battery can. If you have the battery replaced the motherboard, but also solve the problem, you should check the motherboard CMOS jumper have any questions, sometimes because it would be wrong on the motherboard CMOS jumper set to clear the option, or set to an external battery, will be made CMOS data can not be saved. If not the above reasons, you can determine that the circuit board there are problems, I suggest you look for professional repair.

【8】 examples: Board anti-virus does not shut down, resulting in the system can not be installed

Install Win98 initial stage, the screen suddenly appeared on a black rectangular area, such as what prompt, and then stop installed. Adjust the display brightness and contrast switches are also invalid, killing the virus with anti-virus software and did not find any viruses.

Failure Cause: This behavior is easier to buy in the new motherboard, because by default, the new motherboard BIOS in the anti-virus is set mostly Enabled, it will appear similar to the failure.

Approaches: carefully read the motherboard manual. Into the CMOS setup program, the "BIOS Features Setup" (BIOS feature set) in the "Virus Warning" (Virus Warning) option from the "Enabled" (allow) set to "Disabled" (Prohibition), you can solve the problem .

【9】 examples: Installing Windows, or start Windows when the mouse is not available

A old 586 computer, install Windows, or when you start Windows the mouse is not available to replace a good mouse, the fault is still not be excluded. Suspected to be board PS / 2 mouse interface failure, to get the professional board test points, check the PS / 2 mouse port to normal.

Cause of the malfunction: CMOS parameter errors caused by IRQ settings. Such failure is common in the old 586 computer, new motherboard generally will not have this problem.

Approach: In the CMOS settings, power management field, there is a Modem use IRQ project, options were 3,4,5 ......, NA, in general it is the default option for three, set it to 3 other than the interruption of items, you can troubleshoot.

In addition, a number of old 586 computers, COM port and LPT port is connected through a signal cable connected to the chassis outside of the signal line of the access method, with the board differ, if the access method does not also lead to the mouse is not available, their access laws generally have the following two:
(1) signal line in accordance with the order of 1 to 9, in turn connected with the connector;
(2) signal line and the connection point cross-linked above a row of connectors are connected to the signal lines 1,3,5,7,9, following a row as 2,4,6,8.


【10】 example: Cache on the motherboard is damaged

Cache on the motherboard is damaged, the performance to run the software crashes, or simply can not install the software.

Approach: in the CMOS settings, "External Cache" entry set to "Disable" after troubleshooting.

3, I / O device is not functioning properly fault

【11】 examples: board COM port or parallel port, IDE port failure

Cause of the malfunction: General is due to hot plug hardware caused by the user.

Approach: You can use multi-function card instead. But instead, you must first ban on the motherboard that comes with COM port and parallel port, pay attention to some motherboards with IDE port to be banned, before being used normally.

【12】 example: can not use the keyboard interface on the motherboard

Good to connect a keyboard, power on self test when prompted "Keyboard Interface Error" after the crash, unplug the keyboard, re-inserted to pursue a normal start the system, using the keyboard no response after a period of time.

Failure reason: plug the keyboard several times, causing loose keyboard interface board.

Approach: remove the motherboard can be a good electric soldering iron to re-. If it is charged plug the keyboard, causing a form of insurance on the motherboard of the power block (on the motherboard marked as Fn things), put on a 1 ohm / 0.5 watt resistor.

【13】 examples: integrated on the motherboard display adapter failure

The Great Wall has a computer, the boot sound 8 sound, determine display adapter failure. Open the case found that the display adapter integrated on the motherboard, nor the motherboard manual.

Cause of the malfunction: After boot ring several more, most of them do not insert a good memory, motherboard or display adapter failure.

Approach: a close look at the jumpers on the motherboard marked, shielding out the motherboard on the integrated display device, some motherboard CMOS settings need to prohibit the integrated graphics on the motherboard; and then plug in the expansion slot on the card can be good.

【14】 example: the printer parallel port on the motherboard is damaged

Of more than 486 computers, printers, parallel port integrated on the motherboard most prone to such failures, resulting in not print.

Cause of the malfunction: Charged plug the printer cable signals, most likely to cause damage to the parallel port on the motherboard.

Approach: Check whether the printer supports DOS printing, in pure DOS mode, use the DIR> PRN (only for needle and some laser printers, inkjet printers and effective), see Printing is normal; see motherboard manual, through "to prohibit or allow on the motherboard parallel port function "related to jumper, set the" mask "function on the motherboard parallel port (or through the CMOS settings to shield), and then in the ISA expansion slot you can add a multi-function card.

【15】 examples: the motherboard of soft / hard disk controller is damaged

Cause of the malfunction: from 486 started, most motherboards have integrated soft / hard disk controller, the controller damage mostly caused by electrically charged pluggable.

Approach: For the following conditions are dealt with separately.

(1) floppy disk controller on the motherboard is damaged you can change the jumper, or CMOS settings, plus a multi-function card, Gaoding.
(2) hard disk controller, a bad hard drive, if the access is less than 528MB, you can add a multi-function card,; if by then the hard disk is larger than 528MB, need to update the motherboard BIOS, or the use of relevant software.

【16】 instance: IDE connection error, can not find hard drive

A 40GB console, in a dual-drive Duikao, re-connecting to the main hard drive and boot the machine prompts can not find any IDE device, can not find the hard disk can not access WinXP. After the restart enter the CMOS setup program and found not detect any IDE devices are not detected from another hard drive.

Fault reasons: frequent occurrence of such failures. If it is not the hard disk itself is damaged, then the wrong motherboard IDE cable or IDE port is damaged, can lead to such failures. In addition, hang the hard disk, if the failure to make timely change the jumper, there will be a similar situation. The investigation in this case is caused by the errors IDE cable, ATA/100 hard drive line Slave port connected to the hard disk.

Approach: Master port can be replaced.

4, power failures category

【17】 examples: power switch or RESET key to damage boot after a few seconds automatically shut down.

Cause of the malfunction: Now a lot of switches and lights on the chassis, headphone jack, USB socket poor quality. If the RESET key is pressed after the bombs are not up, after power on because the host is always reset, so press the power switch, the host will be no response, and processing power are not the same, so the power light and hard disk light does not shine, CPU the fan not to switch.

Approach: Open chassis, repair power switch or the RESET button. Mostly on the motherboard power switching power supply, the power tubes used for the separation of the device and, if damaged, as long as the replacement power tubes, capacitors can be.






【18】 example: power supply socket with virtual access, loose

This situation is rare, may from time to time to restart the emergence of the phenomenon.

Approach: inspection can be turned on, the hand-shaking every part of the power line interface to see if there is failure phenomenon.

【19】 example: insurance resistor fuse on the motherboard

There can not find the keyboard and mouse, USB mobile devices can not be used and so on.

Fault reasons: the insurance resistor fuse on the motherboard.

Approach: determine the methods of simple, use the multimeter to measure the resistance of files off of. If that is indeed the insurance resistor fuse, you can use 0.5OHM about resistance replace.

【20】 example: Power not the machine is configured to nForce2 motherboard, Athlon XP 1700 + (overclocked to 2400 +) CPU, each boot to be repeated by several times the total "Power" button to light up the computer, and sometimes still in testing standstill when the hard disk, and restart one can usually solve the problem.

Cause of the malfunction: Athlon XP 2400 +'s power has reached 70W, while the nForce2 motherboard circuit design of the power supply stability requirements are very high.

Approach: replacement of brand-name power supply, you can troubleshoot. Chassis poor power supply, the computer will cause great harm to the various parts. Proposed nForce2 motherboard players in preparation for a 300 ~ 350W brand names (such as the Great Wall, buffalo, HuntKey, etc.) power supply. 5, hardware compatibility failures

【21】 examples: the motherboard is not compatible with the display

PC configurations for the elite P6ISA-II motherboard (i815E chipset), Samsung 750S monitor, install the driver later, when the boot display appears stripes and actually does not restart after the display of the imaging. Use substitution to replace all the parts in turn, found that when using P6ISA-II motherboard with Samsung 750S equipped with machines, fault occurs, and if the block with this motherboard compatible with the other displays, fault does not appear.

Cause of the malfunction: the motherboard is not compatible with the monitor approach: replace the motherboard or the display can solve the problem.


【22】 examples: the motherboard and memory are not compatible machines are nForce2 motherboard, added a 256MB Kingmax DDR400 (TinyBGA package) memory, and the composition of the original memory, dual-channel mode, but the added memory, the system becomes very unstable, play games from time to time when the automatic restart or crash.

Cause of the malfunction: nForce2 motherboard memory more selective about the other, Kingmax memory, and a lot of motherboards are not compatible with the existence of the problem.

Approach: nForce2 motherboard with Kingston's DDR333 (Infenion particles), DDR400 (Winbond particles), and Samsung original memory, with very good, we recommend installation of this type of memory.

【23】 example: the driver is not compatible with the motherboard in a number of brand-name motherboard, sometimes there such a phenomenon: the motherboard driver Asus after the restart the computer in normal mode does not enter the Win98 desktop, or a crash occurs, CD-ROM drive access slow phenomenon, and that the driver can not be uninstalled under Win98.

Cause of the malfunction: the motherboard and the driver is not compatible.

Approach: find the latest motherboard driver re-install, issues are generally able to resolve. If not, you can re-install the system.

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