Laptop power supply principle Explained

Notebook without power fault conditions in several ways, namely:
First, use the adapter without electricity, but the use of battery power-normal;
Second, use the adapter power-normal, but without using battery power;
Third, use the adapter and the battery can not power up.
The three failures are very common in notebook computers, in order to maintain the three failures, must have the laptop power-up process.

The following simple analysis of the notebook's power-process.
When we press the power switch after the low (or high) of PWRSW # signal triggered PC87591, PC87591 and then issued a PM-PWRBTN # signals trigger the ICH, ICH back to laptop mode PC87591 three signals (Figure in step 6), and then the main power supply notebook computers to trigger the switch, such as the main power supply, CPU power supply, etc., and then follow the steps in the diagram in power. As shown.

MOBILE PHONE SERVICING- BGA CHIP REMOVAL GUIDE

BGA chip removal and welding
1. Guide
With the rapid global development of mobile communication technology, many handset makers compete to launch new compact and powerful mobile phones. In these new phones, the widespread adoption of advanced BGAIC (Balld arrays ball grid array package), which has spread the technology can significantly reduce the volume of mobile phone, enhancements, reduced power consumption, lower production costs. But, like all things beneficial to have disadvantages, BGA package IC is easy to fall caused by Weld, and to the maintenance work led to great difficulties.
BGA packaged chips are used precision optical instrument patch installed, error is 0.01mm, while the actual maintenance work, most of the repairs were not like the SMT equipment, even with all welding hot air and feel installation, little chance of success.

BASIC ELECTRONICS-FET TESTING

As the FET structure, principle and common transistor different conditions in the amateur use multimeter to determine the method is not the same as before the test what your hands touch touch water pipe, or ground, to let go of the body's charge.

1.G pole (gate) of the judge: multimeter with R × 100 files, each FET were measured resistance between two feet (both positive and negative to the test once), there should be a pair of feet to several hundred ohms resistance (such as are high-value,

BASIC ELECTRONIC-BASIC COMPONENTS DETECTION METHODS

Components of the detection is an appliance repair basics, how to accurately and effectively detect the components of the relevant parameters to determine whether components of the normal, not a stereotyped thing, must be based on different components use different methods to determine components of normal or not. Especially for beginners, proficiency testing methods commonly used components and experience is necessary, the following test on the common experience of electronic components and test methods are introduced for the right.

1, resistor detection methods and experience:

BASIC ELECTRONICS- USE OF CAPACITORS

1. DC blocking: role is to stop by and let the exchange by DC.

2. Bypass (decoupling): for the exchange of circuit components in parallel to provide certain low- impedance path.

Detection of laser diode

(A) determine the pin order of the multimeter to put R × 1K block, in accordance with the detection of common diode positive and negative resistance method, can be laser diode of the pin in the order determined.

EPSON C4X series printer maintenance

Printer connected to the mains, press the printer's power button when the green indicator light does not shine, the printer does not work, press the key for the red ink light is not bright, it could be the printer's power supply broke down.

The first step to take off the printer's plastic cover. Off-white plastic cover with plastic buckle 7 is connected with a gray base with a screwdriver to push up one by one plastic button, you can take off the plastic cover and then remove the paper into the frame. Connected to electricity, with a multimeter to check the availability of CN2 on the 36 V voltage , shown in Figure 2, if no voltage,

Add Printer Tip Print Spooler service is not running solution

When this problem occurs, first check-related services have not started
In the Start - Run - CMD - SERVICES. MSC start the service component or on the desktop select "My Computer" right choice "management";

HOW TO REPAIR COMPUTER MOTHERBOARD

MOTHERBOARD NOT BOOT
a. check whether the short circuit CPU voltage
b. MOS tube 5V and 3V voltage is normal
c. check motherboard VID0-VID5 signal
d. 12V Power Management Chip 0 ohm affect, MOS capacitor for the wrong side of the tube will affect the voltage
e. VID_GOOD signal

A simple mobile charger

A simple charger drawings, to see to understand.

Reform yourself making mobile phone charger, USB data cable and headset

Reform yourself making mobile phone charger, USB data cable and headphones

Many reasons made cell phones for models, charger, USB data cable and earphones since the original machine can not buy the charger cable and headset, to tell you here yourself, use the other line conversion method: This method is suitable for a certain practical ability of the machine friendly, if a novice, it is recommended not to do the same action! Many domestic phone because the model because, charger, USB data cable and earphones after the original machine can not buy the charger cable and headset, to tell you here yourself, with other line conversion method: this method is suitable for a certain Friends of practical ability of the machine, if a novice, it is recommended not to do the same action!

Tools ready: Tools to prepare:

1, multimeter a 1, a multimeter
2: The full line phone socket pin plug a 2: The full line phone socket pin plug 1
3: The maintenance of a power table (need short-circuit protection) 3: The maintenance of a power table (need short-circuit protection)