Hello,
Trying to repair my very first motherboard:
No power draw at all on the USB-C port
I checked every capacitors next to sensitives chips (M92, BQ28, MAX, etc), no shorts. I have checked all the MOSFETS, they seems OK. I have even replaced the M92 by a brand new one.
I have made the readings of the M92 in diode mode (everything unplugged, no battery) and obviously this is not good (can’t upload images):
from bottom right, counter clock wise:
- right side (from bottom to top): OL, OL, OL, OL, OL, OL, 0V, 1.8V, OL, OL
- top side: OL everywhere
- left side (from top to bottom): 0V, OL, OL, OL, OL, 0.78V, OL, 0V, OL
- bottom side (from left to right): OL, OL, OL, OL, OL, 1.6V, 0.78V, 0.392V, 1.87V, 0.88V
So now, what to do next? Maybe injecting some VSYS voltage (4.2V) on the coil and check if something is getting really hot?
What would you do?
Thanks in advance