Came in for no power, was at another shop, looks washed and not rinsed. No visible corrosion. Unknown if water damaged but likely given white chalky film around every solder joint and 100% pink moisture indicators.
Disassembled for initial test, gets 20V, draws boot amperage. partially reassembled, Left side fan stuck at 100% at S0 state : fixed, found missing Q6000 and destroyed trace, likely got knocked off by other shop. Fan seems perfect now.
Current problem: If i plug in the touch/power button the machine refuses to negotiate 20v. Verified all resistors around J4900, and pullups for data, voltage on pin 7 "menu_key_l" present at 3.3. No other voltage, like 1.8. Removed TouchID button, connector looks good, cable seems fine, kinda nervous going much further with the button assembly itself. Never responded to SMC reset so maybe it's screwed. I have a spare button at the shop i can get next week.
U4920 gets enable, gets 3.3. Does not output. No short.
I can probably send this off without power/touchid button working, but maybe someone has a clue?
Disassembled for initial test, gets 20V, draws boot amperage. partially reassembled, Left side fan stuck at 100% at S0 state : fixed, found missing Q6000 and destroyed trace, likely got knocked off by other shop. Fan seems perfect now.
Current problem: If i plug in the touch/power button the machine refuses to negotiate 20v. Verified all resistors around J4900, and pullups for data, voltage on pin 7 "menu_key_l" present at 3.3. No other voltage, like 1.8. Removed TouchID button, connector looks good, cable seems fine, kinda nervous going much further with the button assembly itself. Never responded to SMC reset so maybe it's screwed. I have a spare button at the shop i can get next week.
U4920 gets enable, gets 3.3. Does not output. No short.
I can probably send this off without power/touchid button working, but maybe someone has a clue?
Last edited:
