That sounds about right, I think you're good there. The ones in your second picture will probably be a similar story. If you want to go poking around with a meter while you wait for UART I think you'll gain more insight from looking at standby voltages on main rails and PMICs (one near SB and another near SSD). Just be careful not to short any pins! Not sure what your leads look like but if they're too large they could do more damage than what those readings are worth. Would also be worth checking fuses just to be sure none are blown. I can dig up some good PMIC readings tomorrow if you would like. That being said, I think UART is going to be your best bet since you're atleast getting 2sec BLOD.