Trying to repair a HP Z800 850W PSU by Delta

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  • BLinux
    started a topic Trying to repair a HP Z800 850W PSU by Delta

    Trying to repair a HP Z800 850W PSU by Delta

    This is for my son's computer... got a really nice deal on a HP Z800 (12-core/48GB) for like $250 on eBay. It's been working great for a few months, but then started to randomly reset/reboot, and at times refuse to power on at all. When this happens, there's a audible "clicking" sound, like a relay switch sound. But, it's not consistent... some times the power supply works fine for weeks at a time. And then some times it runs into this resetting issue. Some times worse than others; one time it even failed it's own "BIST" (built-in self test) mechanism, which consists of pulling the PSU out, plugging the power cord in, and there's a LED that turns green if it passes. Most of the time, it passes this test, but some times it fails. Online posts have indicated this test can pass even if there's a problem as there's no load.

    Doing my research online, I found this to be pretty common issue. Several posts claim due to bad capacitors. So I open up the PSU to see if I can find the problem. I can't find any visual signs. I'm attaching photos of I took to see if someone can point out something I missed.

    I got myself a ESR meter, and I've been going through each capacitor one by one. So, far, I've gone through about half of them and haven't found any issues. Though, the Rubycon caps had some incredible ESR readings (0.001 ohms)....

    Anyway, looking for suggestions...
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