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fixing broken psu's

G

gotensan01

n00b
Joined
Nov 22, 2004
Messages
4
I have a non-functioning Antec PSU. I thought that it might be a blown fuse but when I opened it up, surprisingly I couldn't find a fuse. Am I just an idiot or does Antec not use fuses somehow?

If it is not the fuse, what else might I be able to take a look at?
 
For that supply to have any sort of safety certification, it must have either a fuse or a circuit breaker inside on the AC input. There's definitely one in there somewhere...

Usually fuses don't just blow by themselves - something blows them up. Could just be a power surge, but chances are the supply is dead...
 
Had a broken crappy PSU, found the fuse, replaced it and still no go. Obviously it wasn't just the fuse that had blown. It's probably not worth the trouble.
 
The Antecs I've seen had two fuses, both on the high votlage side, each vertical and covered in heatshrink. But when a fuse pops, something else usually does as well, like the high voltage transistor(s) on the big heatsink next to the large capacitor(s). It's so crowded in there that the only way to reach the transistors is by unsoldering everything attached to the heatsink and pulling out the whole assembly.

Finding new transistors or diodes is best done by either Googling the part numbers or going to a website like www.allegromicro.com, www.sanyosemiconductor.com, www.st.com, or www.bdent.com (under "schematics"). Some part nos. have prefixes that aren't printed on them, i.e., a C3039 will actually be a 2SC3039, and some parts that start with "W" actually start with "STW" (ST Micro). You can usually substitute other part numbers, provided their parts meet the minimum voltage, amp, and watt specs and are the same general type (i.e., a MOSFET can't be replaced by an NPN, a regular diode can't substitute for a Schottky), but if you find two in parallel they have to match each other very closely or they won't share the load equally.
 
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