820-01521 dead

tech

Member
power
PP20V_USBC_XA_VBUS stuck at 5 volt
PPDCIN_G3H cycling between 5v to 4.6 v
PPBUS_G3H cycling 12v and then 0 volt
PP3V3_G3H_RTC cycling between 2 v to 2.7 volt
 

tech

Member
no liquid spill
no corrosion found
when I removed R6979 PP3V3_G3H_RTC_R stable at 3.3 volt
PPDCIN_G3H 5 volt constant
PPBUS_G3H 12 volt constant
 

2informaticos

Administrator
Staff member
Of course no short, if cycles 2-2.7V.
But you can compare diode mode reading with good board; that can give you an idea.

Check voltage and diode mode to ground on the small coils around U7800.
Inspect audio board/flex for liquid signs.
Test the board disconnecting J6100.
 
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