| Electronics > Repair |
| How to Repair PC Motherboard Switch and Its Circuit |
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| Mechatrommer:
my PC power switch now playing up. when mains is turned on and i press the PC switch, it will not turned ON, i have to switch off and on the mains, and press the switch several times until success. i think i will repair it before its totally dead but not sure what to repair. i have 2 or 3 previous motherboard with same problem i was simply tossed off and buy new system. now i dont think i can afford that and dont have time to install new system (new MB means new CPU, new RAM new OS etc). any pointer on how to repair? what sort of components involved in there? i can take a picture of inside the casing but now its a liltte bit hard to dismantle everything (so by request). fyi: the mother board is Intel DG35EC (i just take out the box), its say "3 year limited desktop board warranty", now i bought it just passed 3 years (bought in nov2008), i thought intel name MB will be good, i guess its only designed for the dump now just like the rest. hope some pointers. thanks. |
| sonicj:
are you sure it requires cycling of the mains? have you tried another power switch? a different power supply? flashed and/or cleared the cmos? -sj |
| joelby:
What sort of power supply do you have, and how much did you pay for it? Cheap, nasty power supplies usually exhibit these sorts of problems. Swap yours out for a spare, and if that fixes the problem, buy a better power supply. |
| alm:
Corrupt CMOS, flaky power supply and dried out electrolytics on the mainboard would probably be my first guesses. You could measure the PS_ON and POWER-GOOD signals on the ATX power connector and ripple on the power lines. Typical troubleshooting strategy would be parts replacement, however. That tends to be much more efficient that messing around with test equipment. The first part I'd replace would be the power supply, after basics like clearing CMOS and shorting the power switch pins with a screwdriver. |
| Psi:
Check all the capacitors on the motherboard for any bad ones (curved on top surface) |
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