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Sun SparcStation LX PSU Problems

munocat

Member
Joined
Jun 27, 2019
Messages
29
Location
Vancouver WA
I found my LX PSU has blown. When I took the PSU apart I saw that a component had explode. I also found a bunch of leaking capacitors. I order and replaced all capacitors. Also the exploded component. Now when I power it on it squeaks and I hear a relay switching. Does anybody know where I can find a replacement? Does anybody have a dead LX, with a working power supply they are willing to part with. I do not have the skills to diagnose the power supply.

I use this computer for some of my projects, It will be a same to lose it.
 

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NeXT

Veteran Member
Joined
Oct 22, 2008
Messages
7,219
Location
Kamloops, BC, Canada
The power supplies in all of the lunchbox suns (and probably the pizzaboxes now) have extremely bad leakage problems. Normally when I get a switch-mode supply blowing parts I find parts elsewhere shorted from the initial event. Verify the main output transistors and diodes have not failed.
 

munocat

Member
Joined
Jun 27, 2019
Messages
29
Location
Vancouver WA
UPDATE: After recapping the PSU, It did not return to life. I found a TV repair shop, that has been in business sine the 70’s. They have to know how to diagnose and repaired the PSU. It cost me a few $$, but in the end, I have a rebuild PSU. They found other components that had blow or shorted.
 
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