Outofwhack
Member
Macbook dead.
PPDCIN_AON 5.1v
PPBUS_AON 6.7v
Found corrosion underneath sticker on U5700 (replaced)
PP3V8_AON was almost shorted to ground at 3ohms.
Removed 3 (phase) inductors and found 3ohm short was not regulator side.
Injected voltage on system side increasing to 2volts and saw U7700 reaching 80c.
Removed U7700 and 3ohm short only increased to 8ohm which was disappointing.
I assume corrosion on U5700 caused PP3V8_AON to reach 20v and damaged U7700 and others (prob U8100).
Do you think the damage could be limited to two BGAs or time to retire this board?
PPDCIN_AON 5.1v
PPBUS_AON 6.7v
Found corrosion underneath sticker on U5700 (replaced)
PP3V8_AON was almost shorted to ground at 3ohms.
Removed 3 (phase) inductors and found 3ohm short was not regulator side.
Injected voltage on system side increasing to 2volts and saw U7700 reaching 80c.
Removed U7700 and 3ohm short only increased to 8ohm which was disappointing.
I assume corrosion on U5700 caused PP3V8_AON to reach 20v and damaged U7700 and others (prob U8100).
Do you think the damage could be limited to two BGAs or time to retire this board?