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 Tips on reviving a dead XT PSU? View next topic
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Erik



Joined: 28 Feb 2006
Posts: 120
Location: LI, NY

PostPosted: Sat Aug 22, 2020 7:36 am Reply with quoteBack to top

One of the power supplies for my XTs decided to die randomly. It used to work fine but now doesn't output any power to the board.

Any tips or ideas where to look first that might be a simple fix? It's definitely the power supply as when plugging in a different one, the computer boots right up (or as quick as it can slowly count the ram Laughing ).

I checked the fuse in the PSU and it's still intact. Nothing appears to be burnt inside and none of the caps are bulging.

Thanks!

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Nukem Enterprises - http://eriks.servehttp.com
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T-R-A



Joined: 02 Oct 2004
Posts: 578
Location: Western NC

PostPosted: Sun Aug 23, 2020 6:56 pm Reply with quoteBack to top

Just because capacitors don't bulge, doesn't mean they're not bad. Electrolytic caps are the first suspect in any P/S that shows no other signs of failure.

It'd also go a long way for you to purchase a (cheap) multimeter. They can be had for a little over $6 at Harbor Freight. They're still good enough to check for electrical shorts and measuring resistors, diodes and transistors...


https://www.harborfreight.com/7-function-digital-multimeter-63759.html
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T-R-A



Joined: 02 Oct 2004
Posts: 578
Location: Western NC

PostPosted: Wed Aug 26, 2020 12:48 am Reply with quoteBack to top

And, FWIW, I repaired a board (for a car-wash) yesterday at work which had a shorted electrolytic cap in the power supply section. It showed absolutely no signs of being bad...it's routine for me to check these since they are on a backplane board that supplies power to other boards.
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