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PSU caught fire.

post #1 of 98
Thread Starter 
Hey guys.

Let me preface this by stating I'm a first time builder and did what I did with haste and not carefully.. So now I have royally effed up but I would greatly appreciate your input. For reference my PSU was a 500W OCZ, if it matters.

I connected the main motherboard components without hassle but when it came to connecting the supplied case fans I hit a problem. The exhaust and intake fans were cables with 2 pins. My motherboard had only room for one System Fan header (the CPU fan header was already taken up due to the stock cpu cooler). I never came across this in the build vids I saw but then figured out that the PSU has a molex cable attached. I plugged the 2 pin molex cable of the fan into the 4 hole molex PSU cable, at this point my brain said - hang on, don't you need to utulise that system fan header there son? To which I replied by connecting the floppy disk power cable (I didn't know it was this at the time) into the motherboard fan header...... it made sense at the time in my mind because the 3-pin header fit perfectly.

Great I thought. Off I go to turn it on.

Yes... thankfully I left the case open and immediately saw smoke. Turned off system unplugged everything but the yellow cable off the molex was on fire and bright yellow. adjshdfghasdkijsfdndsfmsdbfsndfsdfnsdjfsbf mad.gif

Within 3 seconds it stopped.

I've attached some pics - here is the album: http://imgur.com/a/3WmsV
Plugged connectors in pics 1 and 2 together, put the floppy power on the fan header, end result is the burnt cable.

Now my concerns is:

is the PSU reusable?
is the mobo and other components reusable?


I should add that the system started up fine and the fans started working as they should. The only downer was the small fire. From the outside the mobo looks exactly the same as when I took it out the box. The 3 pin fan header looked pretty fine as well despite it being near to the fire.

Where did I go wrong? Was I supposed to connect the 2 pin connector and the 4 hole molex only? What about the 2 spare holes?

Idiot of the year candidate right here, I feel so empty inside. :facepalm:

How can I fix this?
post #2 of 98
What OCZ unit is it?

Is it a ModXStream Pro?
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Seravee
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post #3 of 98
You likely blew the motherboard and possibly the PSU. Plugging the floppy power connector into the fan header at the very minimum applied 12V or 5V (with high current availability) to the speed sensing pin in the fan header, which no doubt totally roasted the IC that provides the speed sensing and fan speed control on the motherboard.

What else was damaged beyond that is questionable. You'll need another PSU and another motherboard to properly diagnose the situation, and you run the risk of damaging both of those test components in the process.


What possessed you to hook the floppy power up to the fan header in the first place? Just because it fits doesn't mean you plug it in. LOL. Chalk that one up as expensive learning experience.

The 2-pin fans with their 4-pin Molex sockets should be plugged into the 4-pin Molex power plugs from the PSU. It connects the 12V positive and negative connection to the fan. You only need 2 pins to run a cheap case fan, as they have no speed control capability, and no speed sense capability. Those two other features are what separates a 2-pin cheap case fan from a 3-pin fan with speed sense, or a 4-pin fan with PWM speed control capability.


Greg
post #4 of 98
The floppy connector is called a floppy connector for a reason...

If it was only a 2 pin fan then all you had to do was plug it into the molex.
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post #5 of 98
Thread Starter 
Quote:
Originally Posted by shilka View Post

What OCZ unit is it?

Is it a ModXStream Pro?

Quote:
Originally Posted by hammong View Post

You likely blew the motherboard and possibly the PSU. Plugging the floppy power connector into the fan header at the very minimum applied 12V or 5V (with high current availability) to the speed sensing pin in the fan header, which no doubt totally roasted the IC that provides the speed sensing and fan speed control on the motherboard.

What else was damaged beyond that is questionable. You'll need another PSU and another motherboard to properly diagnose the situation, and you run the risk of damaging both of those test components in the process.


What possessed you to hook the floppy power up to the fan header in the first place? Just because it fits doesn't mean you plug it in. LOL. Chalk that one up as expensive learning experience.


Greg

I just did it. Crazy mistake. Do you reckon that I can get away by using a new PSU to test if the other components still work? Or should I replace the mobo and psu at the same time?
Quote:
Originally Posted by hammong View Post

You likely blew the motherboard and possibly the PSU. Plugging the floppy power connector into the fan header at the very minimum applied 12V or 5V (with high current availability) to the speed sensing pin in the fan header, which no doubt totally roasted the IC that provides the speed sensing and fan speed control on the motherboard.

What else was damaged beyond that is questionable. You'll need another PSU and another motherboard to properly diagnose the situation, and you run the risk of damaging both of those test components in the process.


What possessed you to hook the floppy power up to the fan header in the first place? Just because it fits doesn't mean you plug it in. LOL. Chalk that one up as expensive learning experience.

The 2-pin fans with their 4-pin Molex sockets should be plugged into the 4-pin Molex power plugs from the PSU. It connects the 12V positive and negative connection to the fan. You only need 2 pins to run a cheap case fan, as they have no speed control capability, and no speed sense capability. Those two other features are what separates a 2-pin cheap case fan from a 3-pin fan with speed sense, or a 4-pin fan with PWM speed control capability.


Greg

Quote:
Originally Posted by shilka View Post

What OCZ unit is it?

Is it a ModXStream Pro?

CoreXstream
post #6 of 98
Im confused as to what has happened here, I dont understand from your pictures. On my build I had like 8 fans in my pc, they are all connected via a 3pin or 4pin fan header, like this:

Once I have used up all my CPU fan header and SYSTEM fan headers on my motherboard, I grab a few of these:

Then I just connect the rest of the fans together into one big molex connection train, if you like to call it that. So I have a molex cable from my PSU, then 3x 3pin-to-molex plugs all plugged into one another to power my fans.

My system fans have been like this for ages, never had an issue. Is this what you've done or am I missing something?

Edit: Think I just realised, did you plug one of these into your fan header on your mobo?:

Edited by $ilent - 6/11/13 at 9:11am
post #7 of 98
The OCZ CoreXStream is a cheap crappy unit made by HEC which seems like they are a bunch of underpaied overworked monkeys

It uses Taiwanese Teapo capacitors
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Seravee
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post #8 of 98
Thread Starter 
Quote:
Originally Posted by $ilent View Post

Im confused as to what has happened here, I dont understand from your pictures. On my build I had like 8 fans in my pc, they are all connected via a 3pin or 4pin fan header, like this:

Once I have used up all my CPU fan header and SYSTEM fan headers on my motherboard, I grab a few of these:

Then I just connect the rest of the fans together into one big molex connection train, if you like to call it that. So I have a molex cable from my PSU, then 3x 3pin-to-molex plugs all plugged into one another to power my fans.

My system fans have been like this for ages, never had an issue. Is this what you've done or am I missing something?

I connected the fan to a molex but I also connected a floppy disk power cable into the fan header. I never should have but I did without knowing if it was correct procedure. Obviously I didn't know that what I plugged into the fan header was a floppy power cable. tongue.gif
post #9 of 98
Thread Starter 
But if I replace the PSU only, then all is good? Right? redface.gif
post #10 of 98
Quote:
Originally Posted by asfrn View Post

But if I replace the PSU only, then all is good? Right? redface.gif

If the PSU only killed itself then you are lucky

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