This unpatched switch does not boot. There is no signs of prior rework and no signs of dropping damage or liquid damage. The owner said it has been used only on stock fw and it was sitting on the official dock for few months without use and now it didn’t turn on anymore.
When I plug the charging cable (draws current at 0.4A) there is only black screen and most likely goes to autoRCM mode. I can run Hekate (without jig) but I cannot launch the eMMC (failed to init).
I have tested it with a known good battery. I checked the USB-port with breakout board and everything looks normal. I couldn’t find any shorts on the caps of M92, BQ, P13, MAX77620 and inductors were not open line. BQ diode values also look normal (and voltage were 15V and 4V), at M92 I get 3.3V and 1.8V
Is the eMMC corrupted? How can I verify it?
Based on this forum the problem could also be on the fuel gauge IC (MAX17050) or on CPU buck failure MAX77621. How can I troubleshoot these chips?
What other troubleshooting I can do with Hekate?