A1706 MacBook Pro mid 2017 no internal SSD 820-00923

[slimmy182]

Hello people.

I've purchased this mid 2017 13" MacBook Pro touchbar, logic board number 820-00923 who don't recognize internal SSD anymore. When powered on it display the question mark. Seller says that it simply stop working one day, no liquid spill, failed update or so. It can operate perfectly installing MacOs on external drive, but internal SSD storage does not show up in online recovery nor when external hard drive is plugged it to launch MacOs.

I decided to open it and try to resolve the problem. Never been opened or worked before for sure.

Inspecting the board under the microscope show this two little spot of corrosion:

probe point TP[1]TP_Q3100_DRAIN , picture show before and after cleaning




and LB300 (It's a filter?)



I can't find any other spot or phisical damage on this board. J9600 (lifeboat port) also look good. Could you please help me fix this Mac? Any advice or suggestion what to check it's really well accepted. Thank you in advice!