Gigabyte GA-H81M-DS2-T triggered the power failure, and the WR66 resistance was severely corroded. After the resistance was replaced, the fault was removed.
The memory slot is corroded, and both sides of the memory are corroded. Especially, the memory chip on the right side of the memory is burnt directly. First, the memory slot is replenished, and then the screen line interface is processed. The other side of the screen line is also burnt. Scrape it with a knife, patch a line, and then plug it back in. The boot current runs directly, and the machine is turned on.
HONOR Play3 screen does not display, and the fault is fixed after replacing backlight diode.
ASUS H110M-F 1.01 VPPDDR does not light up, replace the chip, remove PU502 and PL502, and solder 1117.
HUAWEI P20 can't be turned on. Remove the short-circuit capacitor and repair the fault.
It is the problem of judging the power supply chip and its peripheral accessory components. Brush the solder paste, and re-solder the capacitors and resistors around the chip to be processed with an air gun. After cooling, the bare board is electrified, and the current goes up to 0.5+ and then goes up to 0.8+~1.0+ after a short stay. Plug in the screen and test the lighting machine.
It was suspected that the resistor was leaking. The R2014 resistor was tested by 10K and 100K in turn. The voltage of HDP was different, which ruled out the problem of CPU. It was caused by the leakage of R4521 resistor. Remove the motherboard, wash R2014 with washing water, and the boot is normal.
ASUS B85-PRO GAMER has reset without code running, short circuit the C and E poles of SQ35, reset the PWROK signal of the bridge, and replace the SQ35 with code running light.
HONOR 20 can't be charged, and the fault is repaired after replacing the battery.
