Acer E1- Z5WE1(LA-9535P) Laptop Does Not Turned On,No Power Repair

Laptop Model : Acer E1-Z5WE1

Motherboard Number : LA-9535P

Fault : Does Not Turned On No Power

Repair Process :

The plug can be adjusted up to 0.08A, but the switch does not trigger. The current is so large that it feels linear, but the 3V5V PWM has not come out.

Because it has been repaired too much, it feels a little bit, but it is not necessarily accurate. Go directly to the 3V5V inductor. After a test, I found that one is 3.0V and the other is 3.3V.

After a closer look, the 3.3V is correct. The 3.0V is originally 5V. How did it become like this? Check the conditions.

After checking, I found that the voltage of pin 5 is wrong. It should be 3.3V. Let's see where the voltage goes. I found that it didn't go anywhere. I only connected a capacitor PU420.

I measured the secondary value of pin 5 to ground and found that it was only 7. This was too small. I didn't even think about blowing the PU402. When I measured it again, it was still 7.

Actually, the PU420 died. After replacing it and restoring it, the standby voltage is OK, the trigger power-on current is constant, the memory is also bad, replace it with the memory for testing, the trigger current is normal, and the repair is completed!

Happy Repairing !