Hello, I'm troubleshooting Xbox 360 S, it was showing no power symptoms some 8 years ago, I took it from storage and it does the same now.
What I've found so far is, that Pin 13 of front RF board (hopefully 1409) connector have 3.3V when board is out. When I connect the RF board voltage on pin 13 drops to 0.5/0.6V, measured against RF board plug outer case as ground (what more, voltage on source drops from ~5.2 to 5.0, also brick switch orange light immediately when plugged out from wall - with MB only, it stays light for quite a while).
Well, main question - is it expected behavior, or did I find something that might cause no power symptoms? Should I focus on RF board, or should I try another power brick (friend have one working OK)?
I'm measuring on plain motherboard, CPU with fan connected, connecting RF board to see a difference. Everything else out (network module, dvd, etc).
Few more details:
MB is probably Corona generation, but even with information from XenonLib I wasn't able to identify it certainty.
I've already cleaned MB and RF board with isopropylalcohol. RF board had bit of deposits around connecting port pins - those seems clear now.
Power brick has 5v on left port, something around 0 on right when disconected. Brick only shows orange light - no green/red/off flicker when connected to console.
Console doesn't light up any led, cd doesn't eject, no button reaction.
I've disassembled the console to boards. I haven't fully measured power rails yet - I need to identify right naming of points on rails to measure (XenonLib as generous as it is, probably expects bit more experiences on board troubleshooting than I have) - any help with that - board maps, commented pictures, threads/links with description are welcome.
Any help is welcome!