Power supply problem(4pin plug melted)


I built a PC two years ago and i just cleaned it recently. I discovered that the 4pin plug which goes into the motherboard melted a little (24pin plug also turned a little brown but barely noticeable). I didnt pay much attention and plugged it back.

Everything was fine untill recently:

-My PC restarted itself after a 20-30 minutes everytime I turned it on.(Everything booted and it worked fine, I checked the HDD, CPU and the Video card, I didn't notice any problems)

-After a while it restarted and the leds were dark but the fans worked, nothing showed up on the monitor. I restarted it and then everything was fine again, my OS booted. I turned it off and took a look at the 4pin plug and it was melted.

Here I stand completily puzzled what to do.( I could go to a an expert but i think he just say that I should buy another power supply and he wouldn't check anything)

My PC specs are the following:
-Nvidia GTX 460
-Intel quad core q9400
-Samsung HDD HD103SJ 1terrabyte (SATA3)
-P5P43TD ASUS motherboard
-Powersupply: HKC USP5565 2.2version 565W (it was a really cheap one, around 50USD)

I took some photos of PC(sorry for the quality):

<a href="http://imgur.com/KFhPv"><img src="http://i.imgur.com/KFhPv.jpg" title="Hosted by imgur.com" alt="" /></a>

<a href="http://imgur.com/OvGdW"><img src="http://i.imgur.com/OvGdW.jpg" title="Hosted by imgur.com" alt="" /></a>

<a href="http://imgur.com/PHrco"><img src="http://i.imgur.com/PHrco.jpg" title="Hosted by imgur.com" alt="" /></a>

<a href="http://imgur.com/G522n"><img src="http://i.imgur.com/G522n.jpg" title="Hosted by imgur.com" alt="" /></a>

<a href="http://imgur.com/7m6FN"><img src="http://i.imgur.com/7m6FN.jpg" title="Hosted by imgur.com" alt="" /></a>

I would really appreciate any advice.

Thanks in advance,
1 answer Last reply
More about power supply problem 4pin plug melted
  1. The orange wire on the 24 pin connector should be the +3V conductor. The wire on the 4 pin that's fried also looks orange, but must be red, because that would be the +12V conductor. Either way, it is a sign of a poor connection that was arcing, or something on the board that was drawing way too much current. I would doubt the latter. The PSU is unsafe to use and should be properly disposed of.

    The 24 pin header on the board 'looks' OK, but the 4 pin is questionable from what can be seen in the pic. If I had to guess, I'd say the cheap PSU had poorly manufactured connectors that caused arcing due to poor fit. Or perhaps poor wire-to-pin connections. You could try a new PSU and see if it fixes the issue. Ideally, you'd want to replace the board too. But if that is out of the question, try the new PSU first.
Ask a new question

Read More

Power Supplies Components