820-01700 no power

[Max7]

No signs of water damage or corrosion. It came in with a no-boot issue.

Some strange behaviour is all ports drawing 5v 28mA. However, when I plug the master USB port into another laptop to check if it is stuck at DFU, another port that I try to power the laptop starts drawing 20V, 0.0A. I am not sure if this is the sign of something.

Further investigation revealed a short on PP1V8_SSD0 as measured at C9132. Resistance to the ground is 1 ohm. Is it what I am afraid of ? (Dead NAND) ? Or could it be a short elsewhere ? Same capacitor on the other NAND is not shorted.

I appreciate it if you let me know if there is anything else I can check.

 

[2informaticos]

Only 1V8 SSD rail shorted to ground?
2V5 rail is OK?

Wit 1 ohm resistance, you can use voltage injection method, to find the culprit.

 

[Max7]

1V8 and 2V5 was both shorted to ground, injected 1V to 1V8 rail and thermal camera was only showing head at the NANDs.
I suppose there is not much we can do about it ?

 

[2informaticos]

Must change the NANDs, if you want to repair the board.
Be aware of all the work required...