Update:
I pulled out the caps, including the super one.
No major corrosion, just little soldermask damage under a cap.
I've measured all the ESR before desoldering the components, according to the ESR meter only one cap was still OK.
I also noted the measurement in one of the attached pictures, I'm curious to see the difference with the new caps in circuit.
@samnmax:
I made some experiment on scrap boards with the wiggle tequinique, I found it to be really slow with high chance to lift the pads. I think two irons works best for me.
This is how I do it:
- I add some fresh tin on the cap terminals,
- I use the two irons to melt the tine and pull the cap. I have consistent result with very short contact time (2sec. max) with iron temp of about 300°C.
- I then clean the pads with the desoldering gun I bough after seeing Dave's review on the thing. That tool is worth every single cent.
To resolder the caps last time I used solder paste heated with the iron, it worked but I don't like the idea of having solderpaste leftovers under the component.
This time I will tin the pad and try tack it in place. Let's see how it works.