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PSU caught fire. - Page 2

post #11 of 98
If you have another PSU, it won't hurt to plug it into the motherboard and see if it will POST. Generally, if a component gets toasted by a direct short, it will burn the component until it's an open circuit, which SHOULDN'T blow another PSU if attached. No guarantees there though.

So, hook up a different PSU to your toasty motherboard and see if it works. If it doesn't, you will need another motherboard to test AND I would then recommend a new PSU to go with it. Going back and forth between blown PSU and blown motherboard to cross-test each other with new components could put you into a loop of destroying the new components in the process.

Greg
post #12 of 98
Thread Starter 
Quote:
Originally Posted by shilka View Post

If the PSU only killed itself then you are lucky

If you are unlucky it could have killed everything in your PC

Interesting. I'm pretty sure the PSU would have continued on going until it blew up if I hadn't killed its power. I'm really worried about the motherboard though. I mean, it looks the same and there is no damage that the eye can see, not even on the system fan header but not sure after that.
post #13 of 98
So did the OP plug one of these into his motherboard fan haeder?
post #14 of 98
Quote:
Originally Posted by $ilent View Post

So did the OP plug one of these into his motherboard fan haeder?
yup. except it was straight from the PSU. not a adapter.
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post #15 of 98
Thread Starter 
Quote:
Originally Posted by hammong View Post

If you have another PSU, it won't hurt to plug it into the motherboard and see if it will POST. Generally, if a component gets toasted by a direct short, it will burn the component until it's an open circuit, which SHOULDN'T blow another PSU if attached. No guarantees there though.

So, hook up a different PSU to your toasty motherboard and see if it works. If it doesn't, you will need another motherboard to test AND I would then recommend a new PSU to go with it. Going back and forth between blown PSU and blown motherboard to cross-test each other with new components could put you into a loop of destroying the new components in the process.

Greg

I'll be buying a new PSU tomorrow but have no means to purchase another motherboard, not for a few weeks at least. But I guess I have no choice.

What about the damage to the CPU and ram, or do you reckon they are still a-ok?
post #16 of 98
Thread Starter 
Quote:
Originally Posted by $ilent View Post

So did the OP plug one of these into his motherboard fan haeder?

Yes. frown.gif

Idiotic mistake I know.

The result was that the yellow cable in that image was burnt. From what I can see there are no burn marks etc on the mobo though.
post #17 of 98
ouch! You basically created a short circuit by doing that! Now with any luck, all you've taken out is the system fan header.

Both the fan header, and the Floppy connector are power outputs, and not the same wiring setup, so when you've plugged the floppy power into the fan header, it's probably shorted the 12V to ground.

FIRST RULE OF BUILDING A PC - Every connector on the PSU / Motherboard does NOT need to be connected

Let me repeat that - Every connector on the PSU / Motherboard does NOT need to be connected.

right on to what you can do next - you've probably toasted the system fan header - you can try a 3 pin fan on it, but it is doubtful it'll work. If it does, you are lucky.

The molex's you plugged together are fine - the two wire fan only needs the 12V power, thats why it only uses 2 connections - 12V and GND. the PSU molex has 4 wires for providing 12V (Yellow),GND (Black),GND (Black), 5V (red) - so the fan is only using the 12V and one GND for a complete 12V circuit. It was fine.

The mistake was the urge to plug EVERYTHING together - and you've basically killed the floppy connector. Does it have the 4 wires running up to the molex? And is the 12v (yellow lead) only burnt up to the molex connector? If so, I'd get snips, and just cut each of the 4 wires that go to the floppy connector - cut them right up beside the molex, being careful not to cut the cables between the molex and PSU. and make sure theres no exposed copper touching - use some electrical tape to cover the snipped wires INDIVIDUALLY.

If you do that, and it fires up (oops! not literally,no pun intended), you have been VERY lucky.

Worst case scenario could have been a fried board AND PSU.
Edited by latelesley - 6/11/13 at 9:21am
post #18 of 98
Quote:
Originally Posted by asfrn View Post

I'll be buying a new PSU tomorrow but have no means to purchase another motherboard, not for a few weeks at least. But I guess I have no choice.

What about the damage to the CPU and ram, or do you reckon they are still a-ok?

Buy something better this time dont cheap out and buy something crappy
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post #19 of 98
You said the system started up just fine. Does that mean the PSU was powering the system when you started it up? If everything runs, then I'd just ignore everything and use it as it is.

I once had an issue where one of my fans punctured a fan cable when I wasn't paying attention installing the fan. The screw grounded the fan to the case. When I powered it up, It short circuited the molex cable and it caught on fire. Luckily the extreme heat severed the cable. The PSU was fine in my case and I found the issue was it was grounded to the case. After fixing that, I didn't have any more issues.

If there are no "apparent" issues, besides you melting one of the cables, I'd just pretend that it never happened. Check if the fan header still works on the motherboard. If it does, then the motherboard should be fine. If the PSU powers the system, then you're golden.
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post #20 of 98
Quote:
Originally Posted by kill View Post

yup. except it was straight from the PSU. not a adapter.

Eh so how did he connect one of his fans to this?
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