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Macbook came in as dead, did a physical inspection on the board, found a hairline crack on the u5200, replaced it. No PPBUS short. Board is not drawing 20V. Your input will be highly appreciated.
3V8_AON is present
Pls can you specify the PMU and LDOs
It didn't enter DFU
But I did check some coils at the U8100
L8100 that should be 1.06V was 0.7V
L8110 no voltage present
L8280 that should be 0.94V has 0.7V
All other coils voltage are present
U7700
L77D0 has 1.2V present
L7740 has 1.06V present
L77C0 has 0.8V present
C7700/C7701 has 3.8V present
C780D has 0.78V present
C7805 has 1.2V present
L800 has 3.8V present on pin 1 and 5V present on pin 2
C7825 has 5V present
U8100
L8230 has a pulsing Voltage
L84E0 no voltage
L8290 pulsing
C81F3 3.8V present
L8281 pulsing
L8280 pulsing