820-01700-A - stuck at 20V 0.07A - tries to boot

quasimodo

Member
Hey guys,

got a 16" here. Corrosion around U7410.

amp meter goes: 0.03 - 0.18 - 0.27/0.31 and jumping and staying to 0.07

put a new U7410 - and replaced all compontens around it.

PPBUS_HS_CPU is 12.6V

resistance to ground on l7410 pin 2 and l7420 pin2 is 7OHM.


what to do? any chance? cpu gone?
 
Last edited:

quasimodo

Member
yes to the battery, when connected its taking about 4A

96W charger - yes.

DFU-Mode no. no sign of life in apple configurator
 

2informaticos

Administrator
Staff member
That's really strange; did you follow all the steps from DFU tutorial?
Check all SSD, G3S, AWAKE and SLPS2R voltages.
 

2informaticos

Administrator
Staff member
L7410/20 may have low resistance to ground as normal.
Compare with similar board, if possible.
Do you get voltage on other big coils?
 
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