I fiddled about with the energy efficiency in the UEFI BIOS several weeks ago and a couple of weeks later my PC kept powering down in use or when going into sleep.
It could stay on for over a day or ten minutes then there'd be a click from the machine and it would power down.
I'd have to switch off the PSU, waith for the motherboard LEDs to extinguish then it could be powered on again. I assume the click was from the ATX PSU but I'm quite hard of hearing.
The warranty expired (bought 2013) so I opened it up, vacuumed it.
Could anyone point me top a service manual or schematics please.
I've found one component frazzled. It's an SMD R or C one of two components off pin 9 on the edge of the underside (solder side) of the board, off the PS233 '4-Channel Secondary Monitoring IC With 4-Channel OCP And an Additional OTP'
https://datasheetspdf.com/pdf-file/666047/SiliconTouchTechnology/PS223/19 OTP Over temperature protection input pin
The surviving component is an 822 resistor 8.2k resistor. It's not that it's the vapourised one to the right of that when board is solder side up and modular sockets facing.
I'l need to figure from there what caused the passives on the OverTemp pin to blow, if it wasn't the build up of dust.. If it holds up I'll maybe do some recapping if I've the right components at hand.
The solder side is quite messy, I wondered if there was a short, unless it's just bad lead free wave solder.
I can try to photograph it but I don't have a fancy camera that does macro and I'm using a Chromebook as my PC until I get a PSU delivered (order still sitting at 'waiting to pick' due to high demand).
Many thanks
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