PSU 11.94V, White Light, Start Beep, Then Turn Off Beep
Update: I have advice from the element14 forums to replace all of the MOSFETs at once. I have yet to try this. I have some light experience using the hot air rework station and Gough Lui gave me some very good advice on how to improve my technique.
Does anyone else have some advice in this regard?
First disassembly and diagnosis:
Tried to swap the MOSFETs:
I have an XBOX ONE S that I bought as “for parts” on eBay and the owner says it was kept in a clean house, etc. It is indeed clean inside. No signs of water damage.
The PSU is also fine. The APU had a TON of thermal grease all over the surface mount capacitors. I didn’t remove that yet but I did re-apply some arctic silver and I used a more reasonable amount.
The symptom I see:
Console when plugged in does a few quick pulses to the APU fan. Is it trying to init?
Console when eject is pressed makes the eject sound, then the shutdown sound immediately after.
Console when power is pressed makes startup beep and then shutdown beep immediately after.
I don’t know what kind of issue I’m getting yet. Is there a JTAG interface or some way to do further diagnosis on this thing?
11.94V sounds perfectly fine for a 12V rail. Should I simpy try plugging a PC power supply into the motherboard to see if it will boot?
Any links or info on diagnosis would be appreciated.
Thanks in advance!
Photos of my motherboard:
I need to find a place to buy a handful of both of these MOSFETs.
4C50 and 4C55N