Hi guys,
I'm new to the forum and i'm looking for some help. I have a broken MPC Live MK1 that I'm trying to fix. When I try to turn it on, pads light up for a few seconds and then it shuts off. When connected to a power brick, battery charges and holds charge as expected. Unit behaves in the same way as the one shown in the video on below page:
https://www.reddit.com/r/mpcusers/comments/yfuqdy/mpc_live_wont_turn_on_can_anyone_help_me_find_out/I've taken the whole thing apart and looked for some obvious faults, like blown components, but couldn't find any. I'm by no means an expert in electronics, but I also did a continuity test on diodes, caps etc. and couldn't find any shorts.
There's not much available about this issue online, except below post on this forum, where someone was troubleshooting the same board with similar issues from another product:
https://www.eevblog.com/forum/repair/trying-to-troubleshoot-a-main-board-with-rockchip-rk3288-microprocessorSomeone there suggested connecting the board to a computer via UART port and configuring it to 115200 baud, 8 bits, no parity, 1 stop bit and no handshake, so that's what I did, but board basically didn't return anything, except for a few jibberish characters from time to time (pushing the reset button would generate such stuff every time). I thought that maybe the baud rate is incorrect, but I also tested my friends MPC Live with the same settings and it worked just fine and printed out the whole boot process, so settings are definitely correct. So, the board doesn't start booting at all - there's something preventing it from starting that process, I guess.
Forgot to mention that I also tried holding down the Recovery button when powering on, but that didn't change anything. Board does not go into update mode and is not seen by the computer.
Also, two LEDs marked as LED STATE 1 and LED STATE 2 are not lighting up under any circumstance. CR1220 battery that's attached to the board was dead when I got it, but I replaced it with a brand new one.
There are some voltages written on the board where there's space for more LEDs, so I checked those as well (not because I knew what I was doing, but to see if measurements will match what's writen

).
There's a close up shot of that section of the board, and results attached. There are discrepancies on three points, and voltages are present for a short period of time when power button is pressed. When it shuts down, there's no voltage on those points.
I'm hoping that someone here can point me in the right direction based on the details provided, or suggest other things I could test. I'd really like to fix this one

Thanks in advance!