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5150 PSU blowing fuses

VERAULT

Veteran Member
Joined
Jan 30, 2012
Messages
5,650
Location
Connecticut, USA
So I have a 5150 PSU that was from a working system (completely working fine) I was using it to test a sketchy 5150 motherboard. Immediately upon powering up the 2a slow blo fuse blew. Removed psu, installed new fuse and attempted to turn it on with nothing connected whatsoever. IT now keeps blowing the 2a fuse (there is a 4a slo fuse that is fine next to it)

Any ideas what to check as it blows the fuse immediately?
 

Agent Orange

Veteran Member
Joined
Sep 24, 2008
Messages
6,141
Location
SE MI
So I have a 5150 PSU that was from a working system (completely working fine) I was using it to test a sketchy 5150 motherboard. Immediately upon powering up the 2a slow blo fuse blew. Removed psu, installed new fuse and attempted to turn it on with nothing connected whatsoever. IT now keeps blowing the 2a fuse (there is a 4a slo fuse that is fine next to it)

Any ideas what to check as it blows the fuse immediately?

Obviously a short. You can Google for a schematic. The first thing that I would look at is the bridge rectifier circuit as well as any caps that appear popped.

While not specifically your particular PS, the following will provide a fairly good example of where to look:

https://en.wikipedia.org/wiki/Power_supply_unit_(computer)
 
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