I received this logicboard with water damage. Initially it was stuck at 5V, ISL6294 had to be replaced and I restored the sensing resistors and traces witch bring back 20V and it is now able to charge a battery.
Without the battery it stabilizes to 0.40A and cycle again .
The fan spins very high for couple of seconds and it shuts down and cycle again.
Noticed that PP3V3_S2 was missing and shorted with 0.077 diode mode reading. I compared with a known working board and it is supposed to be 0.300.
I traced back the short to the BT/Wifi module, I isolated it by removing RD810 and now I am back to 0.330 Diode mode reading.
Unfortunately PP3V3_S2 was still missing, so I checked P3V3_S2_EN and found it missing (0.6V) and shorted (diode mode 0.065 instead of 0.350), I removed RC714 and I can say short is coming from U8100.
Do we need to replace it with one coming from the same exact board model?
Without the battery it stabilizes to 0.40A and cycle again .
The fan spins very high for couple of seconds and it shuts down and cycle again.
Noticed that PP3V3_S2 was missing and shorted with 0.077 diode mode reading. I compared with a known working board and it is supposed to be 0.300.
I traced back the short to the BT/Wifi module, I isolated it by removing RD810 and now I am back to 0.330 Diode mode reading.
Unfortunately PP3V3_S2 was still missing, so I checked P3V3_S2_EN and found it missing (0.6V) and shorted (diode mode 0.065 instead of 0.350), I removed RC714 and I can say short is coming from U8100.
Do we need to replace it with one coming from the same exact board model?
