Power Supply Repair

Start date: Late summer 2023

Background

I was given 3 power supplies, none of which fully worked, and set out to repair them.

Power Supply #1: GW Instek PSP-2010

This supply appears to turn on, but all segments of the display remain on, and it is impossible to get it to do anything:

A quick online search revealed that this is a known issue with these PSP supplies (e.g. EEVBlog repair thread). The one discussed in the thread is the 405, which is 40V 5A, whereas my 2010 is 20V 10A. The problem, as is often the case with older electronics, tends to be excessively old capacitors which have wrong capacitance values and too high ESR.
Opening up my supply, I see two main PCBs:

A quick visual inspection reveals that C25 and C29 are slightly bulging. These are the capacitors adjacent the top right of the middle heat sink on the left PCB in the above picture. I will be replacing these. Unfortunately, I do not (yet) have an ESR meter to easily check all the capacitors. The EEVBlog thread did reveal large changes in measured vs nominal capacitance. I would like to remove these caps, but for this I will need to purchase larger soldering tips, as mine are too small to heat up the large copper pours on this power PCB.
I will resume the repair once this has been done.

Two Other Supplies

The two other supplies are much cheaper, analog-style supplies. Both have issues with the voltage/current readouts. I suspect the dials will have to be replaced. Once I find parts or a workaround, I will update this accordingly (with pictures!).