Question Dead board on MacBook Pro, A2251, 820-01949 ?

[tom_stringer98]

Hello, i need some help. i have a dead board that is only taking 5v and no amps. ppbus g3 h isn't shorted to ground. I also cannot find a short on pp3v3. The usb c controller chips are all good. I cannot find a single short on the board. PP5v is not present when plugged into the cable, is that something i can look into?
Cheers

 

[madagascor]

It sounds like the lack of PP5V is a key issue to investigate. Check the path from the USB-C port to the PP5V rail, including any protection circuits, MOSFETs, or inductors. Verify that the USB-C controller is enabling power delivery correctly. Since there are no shorts, focus on identifying open circuits, damaged components, or missing signals along this path.

 

[Sagebrush Repair]

Check for dust/crud by SSD controllers on both top and bottom of the board. Check the 2.5V NAND supply for presence, check it for shorts. Check for shorts on CPU and GPU VCC, normal readings are about 4 Ohms to 12 Ohms, NOT 0 Ohms.