Don Allen Posted December 17, 2015 Share Posted December 17, 2015 If the three terminal regulator is loose, it is best to put new heatsink compound on it, unless it is using one of the silicon pads, as the three terminal regulator needs good thermal contact with the heatsink to allow it to run at high current loads. Its shuts down due to internal protection circuitry and regulates again when the it's case temperature drops. Link to comment Share on other sites More sharing options...
timsabre Posted December 18, 2015 Share Posted December 18, 2015 The above is true but with the psu running on its own it should not even get warm, never mind hot. It does sound like one or more bad solder joints caused by thermal cycling - go over all the joints with new solder. Link to comment Share on other sites More sharing options...
boatman Posted December 19, 2015 Share Posted December 19, 2015 As you are going to have to remove the PCB to check the solder joints, I would be inclined to change the voltage regulator and the electrolytics anyway. They capacitors may have dried out and, as the PSU is second hand, you don't know what kind of abuse they may have been subjected to. Link to comment Share on other sites More sharing options...
Richard P-W Posted December 21, 2015 Share Posted December 21, 2015 If you're reflowing the solder joints on what sounds like a fairly old bit of kit then make sure you use 60/40 solder (with lead in it) Trying to mix new lead-free solder with the older type will probably create more problems with connections than you had in the first place! Link to comment Share on other sites More sharing options...
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