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Fix or toss??

U

USMCGrunt

2[H]4U
Joined
Mar 19, 2010
Messages
3,103
So I've got a bfgtech 850w psu that I was using on my old system. Last time I turned it on there was this sound of somethin shorting out. So I immediately shut the computer off and when iwent to start it again it would not turn on. Pulled the psu and cracked it open. No scorch or burn marks on anything but I did find a 5amp fuse that was blown. Was wondering if you guys think it would be a good idea to replace the fuse and see if it would work or is there a chance that it could damage the mobo?

I checked the fuse and bought replacements of the very same kind so there shouldn't be any issue of it passing on more amperage then what was originally intended, I just don't want to break anything more expensive in the process lol.
 
Could have just been a bad fuse or something else blew the fuse. If it's the second one it's hard telling what caused it to blow. Got another PSU you can try ?
 
Ya the system works fine with another psu just wasn't sure about it causing issues if I try fixing it.
 
Fuses don't blow by themselves. If there's a blown fuse, chances are some other component in the PSU is also defective and is the real source of the problem. Replacing the fuse would not fix anything in that case.
 
If you already have the fuses its not going to hurt to see if the PSU will turn on. Paper clip jump the supply and use a meter to check voltages out of some of the lines. If you have a spare computer or something you don't mind possibly damaging you can use the PSU and use software to see if the voltage is holding correctly; assuming the system turns on.
 
USMCGrunt said:
So I've got a bfgtech 850w psu that I was using on my old system. Last time I turned it on there was this sound of somethin shorting out. So I immediately shut the computer off and when iwent to start it again it would not turn on. Pulled the psu and cracked it open. No scorch or burn marks on anything but I did find a 5amp fuse that was blown. Was wondering if you guys think it would be a good idea to replace the fuse and see if it would work or is there a chance that it could damage the mobo?

I checked the fuse and bought replacements of the very same kind so there shouldn't be any issue of it passing on more amperage then what was originally intended, I just don't want to break anything more expensive in the process lol.
Click to expand...

Why fix it? Doesn't BFG offer a lifetime warranty? Just send it back & get a replacement!
 
UMASS said:
Why fix it? Doesn't BFG offer a lifetime warranty? Just send it back & get a replacement!
Click to expand...

Unfortunately sounds like he opened it which would likely void the warranty. But still worth a try.
 
That man is correct it has been opened prior to this happening, can't remember why though
 
psu is pretty much the most important part of your pc. i wouldnt screw with it. just get a new one if u can't rma it.
 
Test it with a paperclip, as _K_ recommended. If it doesn't run, then it may require a load on the +12V or +5V rail. But if the new fuse blows, then there's a shorted transistor in the high voltage side, either in the PFC circuitry or the inverter oscillator. Those transistors are usually MOSFETs and aren't expensive from places like B&D Enterprises and Mouser.
 
larrymoencurly said:
Test it with a paperclip, as _K_ recommended. If it doesn't run, then it may require a load on the +12V or +5V rail. But if the new fuse blows, then there's a shorted transistor in the high voltage side, either in the PFC circuitry or the inverter oscillator. Those transistors are usually MOSFETs and aren't expensive from places like B&D Enterprises and Mouser.
Click to expand...

+1 on testing the psu. if you don't know, just use the paper clip to create a connection from the green pin to any black pin on the mobo connector
 
There's the experts I was looking for, I'll try it out and let y'all know what happens
 
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