820-00239 ppbus_g3h short

Roshon

Member
i have a 820-00239 it had water damage i get 20v with 19milliamps i have a short on ppbus_g3h can you help
 

2informaticos

Administrator
Staff member
20V on USB-C input without 3v3_G3H?
That's really strange.
Did you test disconnecting battery?
Are you using original charger?
 

2informaticos

Administrator
Staff member
Sorry, I was thinking to 3V3_G3H, instead of PPBUS_G3H.

Check if any big coil gives the same value to ground as PPBUS_G3H.
 

2informaticos

Administrator
Staff member
0.086 is not very low value.
But you can try injecting voltage; may have luck and some chip enter in thermal avalanche.
Start with low voltage and slowly increase, monitoring the temps; IR cam can help a lot.

Be absolutely sure no high-side MOSFET is shorted.
Check on all big coils.
 

Roshon

Member
it was C7421 that was short PPBUS_HS_CPU
I DON,T HAVE THAT CAP BUT IT IS WORKING WITH OUT IT CAN I LEAVE IT LIKE THIS
 

2informaticos

Administrator
Staff member
These 33uF caps work like energy reservoir for iGPU power supply.
May be important under high graphics load...
 
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