Second, repairing ASUS X540UP notebook can't open the machine.

Second, repairing ASUS X540UP notebook can’t open the machine.

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.

[machine model] ASUS X540UP notebook

[motherboard version number] X540UP REV 2.0

[Fault phenomenon] The notebook can’t be turned on.

[maintenance process]

I received an Asus X540UP fault machine. The customer described that the notebook could not be turned on. I showed it to others and said that it could not be repaired. My friend introduced me to repair it here.

Second repair ASUS X540UP notebook can’t open the machine. Classic common fault Figure 1

Get the machine and visually check that there are no screws behind it. Remove the motherboard, turn on the battery screw connection point, and automatically trigger 0.330. When you see this current, either the CPU is broken or the converter tube or BIOS is faulty.

Remove the motherboard and see that the BIOS hasn’t moved, but the standby part is full of pine oil, so the current can’t be seen clearly at all.

Wash the board with water. As a result, each pin of the standby chip is not welded in place. The air gun blows it down and it is soldered again. The current is still the same when it is powered on. The CPU voltage is normal and the CPU is slightly hot. It seems that the CPU is not hung up, which is a common fault.

Second repair ASUS X540UP notebook can’t open the machine. Classic common fault Figure 2

Second repair ASUS X540UP notebook can’t open the machine. Classic common fault Figure 3

Second repair ASUS X540UP notebook can’t open the machine. Classic common fault Figure 4

Open the bitmap, look for the small 6-pin converter PU8804, directly disassemble it, and then connect it directly to the R0633 resistor at the back of the CPU, and then power it on. The current is 0.26-0.54-0.68-0.48-0.53-0.44-0.75, brush a BIOS, start it up normally, and all other functions are normal. Troubleshoot and repair it here.