Second, the touch panel keyboard of Apple MacBook A1707 notebook can't be used. It was directly installed on the machine for measurement. When the problem was found, the interface voltage was wrong, so the interface was directly changed, tested again, and troubleshooting was carried out.
The TPN-Q214 notebook can't be turned on when it is flooded with water, and the current is directly 0.15. There is a short circuit in this case, so it is suspected that there is a problem with the chip, so just disassemble it and try another one. Let's see if it's the same on the 8th generation machine. It's a 5V=7F [model RT3612C]. It seems that it can be exchanged with each other, replaced, troubleshooting, and maintenance is over here.
Dell 15-5547 notebook does not respond when pressing the switch, and the small inductance next to the small battery is 0 to the ground; One of the nearby capacitors is a little black and has a small crack. After turning off the capacitor, I found another capacitor to repair it
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!
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.
Shenzhou Z10-CU7PF doesn't show maintenance, which is obviously a lack of voltage on the motherboard.
Lenovo Xinchao 7000-13 notebook turned on the fan wildly and the screen didn't show. The fault point was placed on the WIFI and hard disk, and it was found that it was caused by the hard disk. The capacitor cracked, replaced it, and the boot test was normal.
Ying H310MHC2 REV7.3 doesn't show, measuring 2 feet EN3.3V is normal, 3 feet VIN3.3V is normal, 6 feet have no output, and there is no short circuit to the ground. Just replace APL5933C, and the maintenance is over.
Acer 4736ZG plugged in VGA and lost power. It was found that VGA and screen were connected via PCIE bus, and four 470UF capacitors were replaced. This time, the screen was installed and plugged in VGA test, and the fault was fixed here.
