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PSU caught fire. - Page 4

post #31 of 98
Quote:
Originally Posted by asfrn View Post

Oh I think todays events prove that I should stay away from any mods what so ever and stick to what I'm supposed to do. redface.gif

Or it just means - ask questions here FIRST - BEFORE turning on the power! tongue.gifthumb.gif
post #32 of 98
wait a sec, when daisy chaining molexs together do you need the 3pin plugged in too, or does a fan just need some power from the molex?
post #33 of 98
Quote:
Originally Posted by $ilent View Post

wait a sec, when daisy chaining molexs together do you need the 3pin plugged in too, or does a fan just need some power from the molex?

NO, the 3 pin does not NEED to be connected - it is just there to supply power (and in a lot of cases monitor the RPM) of a 3 pin fan. If you do not have a 3 pin fan, nothing needs connected there, If the fan only has a molex connector, that is the only connection needed to the PSU to power the fan. This obviously has no speed monitoring though.


Edit - oh and in the case of a fan that has both a 3 pin AND molex connector - you usually only have to connect one OR the other - unless its a high power beast (think finger cutting Delta) - then the molex power connector is usually supplementing power to the fan. But in most cases, with fans rated under 1A (12W) you only need to connect one of the connectors.

Also - if you DO connect both connectors on a fan with both 3 and 4 pin connections, it shouldn't cause a fire - as all the power lines will match up. In the OP s case, it was connecting mismatched connectors (different wiring) to the fan header that caused the problem. The 12V basically got shorted, as it was connected -

Floppy power

12v GND GND 5V
  |       |      |
GND 12v RPM N/C

Fan header
Edited by latelesley - 6/11/13 at 9:59am
post #34 of 98
I just realised what I asked...it was a stupid question. My fans have 3 pin connection, I plug that into 3pin adapter which is then attatched to molex. So if I didnt have the 3pin plugged in the fan would not get any power. doh.gif lol

I guess if fans had molex and 3pin then you wouldnt need both plugged in. Would it make a difference if you did plug both in in that case?
post #35 of 98
What caught fire the PSU or the cable? I'm confused.
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post #36 of 98
What caught fire the PSU or the cable? I'm confused.
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post #37 of 98
the cable i think on the floppy drive connector.
post #38 of 98
Quote:
Originally Posted by $ilent View Post

the cable i think on the floppy drive connector.
So what he did was take the floppy power connector from the PSU and plugged it into a fan header? And the only thing the caught fire was the cable?
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post #39 of 98
Hey OP if it makes you feel better I recently had a dvd drive, a regular hard drive, and a solid state drive all hooked up to a 3 way sata splitter (Which worked great for ages) and I had plugged the splitter into a molex to sata adapter.

Well, the molex cables are keyed so normally you have to force it like hell to plug it in wrong, but the exception is when the cable has cheap ass plastic that bends very easily. I wasn't in the habit of checking to see if all the cables were matching colors, and the molex slid in upside down like no one's business.

Turn the computer on, and I hear a *pop* followed by some sizzles, I killed 3 drives by plugging it in upside down, which shot 12v to the 5v pins

thumb.gif
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post #40 of 98
Quote:
Originally Posted by Speedster159 View Post

So what he did was take the floppy power connector from the PSU and plugged it into a fan header? And the only thing the caught fire was the cable?

It confused me also, but basically he had his fan plugged in via molex daisy chain which led to psu, then he got a floppy drive connector and plugged it in via molex and then lastly plugged the floppy drive connector into his fan header on the motherboard.

Im guessing he would have been ok if he didnt plug the floppy into the motherboard fan header.
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