Recent content by aarone

donor board it is... :( It did not die in vain. It gave it's U1950 so that another 820-3437 might live again. First board I've fixed too.

it's random unfortunately. Sometimes it does it right away when the charger is connected and sometimes it doesn't :/ It wasn't doing it and I pressed down on the U7200 area and it started doing it. No idea if that means anything for real or if it's a red herring. 10 sec on, one off, small...

Yeah no corrosion anywhere unfortunately. Looking at the schematic could a faulty ISL6259 cause improper signaling to Q7130 (which looks like it creates PPBUS_G3H) and that cause the fluctuations on PPBUS_G3H? Is there anyway to meter CHGR_LGATE and CHGR_UGATE to know if the ISL6259 is working...

On this one it looks like the keyboard connects to the logic board directly rather than keyboard -> trackpad -> logicboard https://d3nevzfk7ii3be.cloudfront.net/igi/oC1yURZJ5qtOsZAc.huge That flex in the tweezer is the keyboard, the trackpad is behind it in the photo

A steady 3.42 V on L7095.

When PM_SLP_S5_L is missing is PM_PCH_SYS_PWROK present out of U1950? Known good DC in board and cable?

PPBUS_G3H varies a little between 8.58 and 8.65 on R7006, doing the same fluctuating on both sides of F7140 L7520 shows a the - sign flashing on and off and a small number of volts like .005v fluctuating L7560 is cycling from 0 to 3.3 or so volts

No signs of liquid damage on this board or machine at all. Doesn't appear to have been cleaned previously. Sometimes I get a short (5 seconds or so) fanspin out of the board and the CPU heats up but it's sporadic and nothing sustained. Green light so one wire is working PP5V_S5 - multimeter...