Lenovo gaming ideapad 3-15ach6

[TOMÁŠ]

Hi,

I have a GOG20 LA-171P Rev1a board. Long story short, this laptop came to me not powering on. I found a short to ground on the KB9022. I replaced the KB9022 and programmed it with a CH431A. The laptop worked for about three days but then stopped powering on again.

I discovered that a small chip, the SY8388BR, was shorted to ground. I replaced it, and once again, the KB9022 was shorted to ground. I replaced it again, but this time, the pad for pin 1 on the mainboard fell off and wasn't connected to anything. I decided to program the KB9022 with the same BIN file as before. Now, the laptop powers on but with no picture and only draws 0.54 amps. I've tried many different EC and BIOS BIN files with no luck.

It seems that pin 1 should be connected, but the pad doesn't go anywhere. All power circuits are present, the CPU and GPU get hot, the RAM has 1.2V, and the BIOS has 1.8V.

Do you think that pin 1 should be connected? Or do you have any other opinions?

Thank you.

[TOMÁŠ]

Update:
How is that possible? I downloaded the BIOS directly from Lenovo and extracted the EC dump, wolala laptop working. The only explanation is that Windows probably updated the BIOS the last time it was working without permission.