MacBook Pro 2019 A2141 820-01700 stuck at 5V

[sekidata]

This non-damaged 820-01700 board is stuck at 5.2V 0.04A on all 4 USB-C ports. I have PP3V3_G3H_RTC_X and all 3.3V and 1.5V LDOs. PPBUS is 12.3V.

PP1V8_SLPS2R and PP1V1_SLPS2R are missing but pulse every second without stabilizing. Does this point to an issue with the PMIC U7800? How to best troubleshoot?

 

[2informaticos]

Check diode mode to ground on U7800's surrounding coils; compare with good board.
Do the same for all big coils; don't forget L9080/580.

 

[sekidata]

Some diode mode readings are lower than on a good board but I see no shorts to ground. What causes U7800 to pulse?

 

[2informaticos]

It can detect overcurrent on some output rails.

 

[sekidata]

Got it. So when I see a diode mode reading, for example, on PP0V82_SLPDDR that's half of the value of a good board, it implies that the T2 is drawing too much current?

 

[2informaticos]

The low reading can be caused by any component connected there; at in least in theory.
But first suspects are the ICs; being more sensitive than a capacitor, for example.
So T2 and U7800, in this case...