Lenovo Xinchao 7000 notebook suddenly shuts down and doesn't start when it is in use. Firstly, it suspects the BIOS program problem, and the fault remains after brushing; After eliminating the sleep switch problem on the small board, remove the magnetic induction sleep chip and solve the problem!
Gigabyte H81 motherboard is powered down, and the BIOS is turned on perfectly due to failure.
HUAWEI Mate 20 screen appears ghosting, short circuit the dropped inductor, make up the pull-up resistor, and repair the fault.
The power-on light of HP TPN-Q194 notebook turns off when it is on. At first glance, it is turned on by the 83rd 83pin of ec. Run the line according to this idea.
Gigabyte H81M-S1 has no CPU power supply. The IT8620E trigger is normal. After replacing the power supply chip ISL95812, the fault is eliminated.
HUAWEI Enjoy 20 can't start the machine, the motherboard is short-circuited, the faulty resistor is deducted, and the fault is repaired.
Shenzhou Z10-CU7PF doesn't show maintenance, which is obviously a lack of voltage on the motherboard.
Asus A68HM-K can only press F1 when starting up, but the BIOS still fails. Then the detection bridge found that the SC18 capacitor leakage caused the voltage to be pulled down, so it would be better to replace it.
Redmi Note 9 Pro touch screen failure, CPU virtual welding, CPU rework, fault repair.
