820-3476 - High PPBUS_G3H? 14 volts

[mccafe]

Hello,

I have a 820-3476 that does not turn on (sometimes). If it turns on, it would be totally fine, but if I leave it or if I press force shut down it would be unable to boot up again unless I unplug battery, unplug charger and connect again. Even then it would be intermittent.

PPBUS_G3H = 14 volts. Is this too high?
I replaced the ISL, checked the Resistors R121/22/51/52, all checks out. Traces are good it seems. Replaced Q7130, but still getting 14 volts.

I notice also when the computer does turn on, pins 5/6 of the BIOS is only 2 volts, is this normal?

 

[2informaticos]

Change battery of your multimeter and post 3V42_G3H, DCIN_G3H and PPBUS_G3H.
Compare with another multimeter too.

"I notice also when the computer does turn on, pins 5/6 of the BIOS is only 2 volts, is this normal?"
You should have 0V there, when board is working...

 

[mccafe]

Thanks, it was the battery of the multimeter. PPBUS is fine @ 12.6 volts. I found out that U8020 was giving random voltages between 2 and 3 volts because it was chipped. Replacing the chip did the trick.