820-00840 dont power on 20V on charger

opsudhead

New member
Hi guys, I have this board 820-00840 with 20V 0.01a , no water damage, no corrosion . Any help

Some measures

PPBUS_G3H. 0.4v
PP3V3_G3H. 0v
PP3V3_UPC_XB_LDO. 3.3V
PP3V3_UPC_XB 0v

no short on PPBUS
 

2informaticos

Administrator
Staff member
Very strange to get 20V without 3V3_G3H.
BTW, test the board alone on the desk, without battery connected.
And post accurate information.
 

2informaticos

Administrator
Staff member
Do not quote an entire post, visible few centimeters above?
Please, maintain forum aesthetic.

Are you really get 20V on USB-C meter with 0V at PPBUS_G3H???
Using original charger?
 

2informaticos

Administrator
Staff member
87W charger is fake?

So 61W cycles 5-0-5V?
Both ports, in both directions have the same behaviour?
Be aware, charger can be connected in 4 ways, 2 for each port.

Check for short on all secondary supplies.
 

2informaticos

Administrator
Staff member
Yes, start checking at big coils.
Don't forget to check behind power FETs.

Also post exact diode mode to ground at PPBUS_G3H and 3V3_G3H.
 
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