Problem with 300W ATX Power Supply

srinath_adipudi · Guest

hi this is srinath. i have a problem with my SMPS. Actually it power up only for 2 sec. and then i shuts down. i removed it and i switched on the power supply by shorting the Green and the Black pins. same thing repeats it starts and then shuts off. i thought it must be the loaded but switching on the power supply without anyting should work. please i need help on this please

Guest · Posted: Mon Apr 24, 2006 4:20 pm Post subject:

If you power up the supply with no load you will blow it up!

Guest · Posted: Thu Apr 12, 2007 8:08 am Post subject:

You will not blow it up. I had one PSU that shut itself down immediately. It was the big rectifying diode after the 5VSB transformer. Also, you will have to connect a dummy load, such as an old CD-ROM drive.

Guest

What's the cheaper option?
A faulty power unit AND a wrecked motherboard, cpu etc. or simply replacing a power supply. It wouldn't do any harm to replace the power unit anyway as they are cheap and if it works then you have just provided a bit of preventive maintenance as the capacitors etc are new.

shadow99 · Joined: 24 May 2007 Posts: 2 Location: Canada

The problem is most likely bad electrolytic capacitors. Bad ones are easy to spot, they'll be bulged at the top of the can and/or leaking brown crud.
This problem affects alot of equipment, motherboards, etc..
They can be replaced.
For more info:
www.badcaps.net