Samsung Galaxy S10+ won't turn on, tried new battery
Testo:
The device is a Samsung Galaxy S10+ SM-G975U1. This is what occurred: my phone was charging while I was on a video call and then the screen/audio froze. The touch screen was unresponsive. The phone turned off. The phone felt a bit warmer than usual. I let the phone cool down and tried to reboot it and nothing happened. I tried recharging it and the phone doesn't respond.
Using a AVHzy CT-3 and a Fnirsi-C1 USB meters, I don't see any attempt to recharge/power up the phone. The meters read 4.9v and 0.1799A. The existing battery was drained so I recharged it to about 3.9v and the phone still would not turn on. I tried with a new battery from ifixit and the phone will still not turn on. I suspect maybe a capacitor/diode/IC has gone bad and I need to do some troubleshooting to get my phone to boot again.
I've seen the "8-4-1 Power On Diagram" on this forum but I need better schematics to be able to find a test point for AP_PS_HOLD to see if it is 1.8V. If anyone can supply me with schematics and board layout diagrams I would be very grateful.
I have a multimeter (Fluke 87V), Hakko FR-802 rework station, and a decent bench top power supply. I just need some guidance to isolate the problematic part so i can attempt a desolder/resolder from a known good part.
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Thanks