Alien Alienware M18 R3 computer screen suddenly restarts with a black screen, and the cpu frequency is locked at 0.78GHZ. Immediately put on four 470uF tantalum capacitors, and the fault was solved.
Macbook notebook screen, replace GPU, weld video memory, disassemble the screen line, and re-insulate. Power on again, perfect display.
Lenovo Y400 notebook didn't respond when pressing the switch. When the trigger current goes up for a while, the power will be turned off, then the original BIOS will be brushed back, and the machine will be turned on directly.
When the TPN-Q191 notebook is in normal use, it suddenly loses power. Carefully observe the fault phenomenon. After running for 3 days, the power indicator goes out. When it is turned on again, the self-test page reports CMOS error 502. According to the drawings, it can be seen that PQ1(AP0203GMT-HF) and PQ2(AON7408) are isolation tubes. Because PQ1 has a large current, no replacement is found, only PQ2 is found. After the replacement, everything is normal through plug-in test.
Dell XSP 15-9570 laptop has a dark screen when it is turned on. Visually, the BIOS and CPU have been passive. It is wrong to measure the voltage of EDPVDD to 0V, and then measure that the 19, 20 and 21 pins of the screen are also 0 V. Dismantle it and replace it with a good one, then connect it with electricity for testing. When it is turned on, the EN voltage is 1.2, and it is turned on normally.
Lenovo ThinkPad E540C notebook is powered on and powered off. After removing the capacitor, the measured resistance value is more than 300 ohms (the one after disconnection). After the capacitor is installed, the computer will be normal
Asus X540UP notebook can't be turned on, the BIOS hasn't been moved, the CPU voltage is normal, turn on the bitmap, look for the small 6-pin conversion tube PU8804, disassemble it directly, and then connect it directly from the resistance of R0633 at the back of the CPU, then power it on, and the current is 0.26-0.54-0.68-0.48-0.53-0.44-0.75.
Lenovo Xinchao 7000-13 notebook has standby current without triggering multi-fault maintenance. [Machine model] Lenovo Xiaoxinchao 7000-13 [Fault phenomenon] The notebook will not be triggered when there is standby current. [maintenance process] Repair a small trendy 7000-13 notebook computer with a…
When the current was debugged to 2V and burned, it immediately became more than 4A. I touched a chip PU18 SA with my hand to supply power, and removed the re-burned machine, but there was no current. First change the SA chip, then continue to change the CPU and graphics card, and restart the current of 1.85-1.96-2.15-2.43. There is no power failure, so it is installed and tested, and the machine lights up perfectly.
Lenovo Xiaoxin Air13IWL notebook standby short circuit, when the current is adjusted to 2V, the current becomes more than 4A. Under a sticker, there is a capacitor next to the standby chip PU701, which can be directly removed.
