The eight-pin chip on the laptop motherboard may be a variety of chips, and in general, we need to determine the function of its pins according to the model of the chip. Here are some basic detection steps:
1. First of all, to determine the chip model, you can query the chip manual or search for relevant information on the Internet.
2. According to the data manual or test chart, find the corresponding function of the chip pin.
3. Use a multimeter to touch the pin of the chip and check the function of the chip. Generally speaking, the first pin of the chip is identified, and we can detect it from the first pin in turn.
4. If you need to test the open or short circuit of the chip, you can set the multimeter to measure resistance or diode test mode, and test according to the chip pin function.
It should be noted that the use of multimeters needs to be careful not to contact the wrong pins or use the wrong test mode to avoid damage to the circuit. If you are not familiar with the detection method of the chip, it is best to ask a professional to test.
First you must have the basic tools for maintenance, then the drawings.
Maintenance steps,
1. Check the bad description, including model, phenomenon and so on
2. Check the appearance
3. Use a multimeter to check whether there is a short circuit in all trunk voltages, mainly because there is a short circuit leading to burning.
4. Determine the power-on voltage and current through the drawing, adjust the power adapter, there is a dedicated power supply can also be
5. Power on each trunk and branch voltage and check the working status of each chip.
6. To this step is to test the strength of the time, if you do not have the chip level analysis ability, you just can soldering iron, coax the gun, repair the appearance of good.
The above is only for the maintenance of the novice reference, remember to eat the guy, soldering iron, coax gun technology to play well in order to get started, and then to improve the ability will use oscilloscope, lcz, grs500, power timing analysis, voltage control chip working principle, various peripheral chip working principle, how to use software to check the working state of the cpu and power control chip. There's a lot of knowledge that goes into it,