I have been trying to repair a speaker hum by diagnosing/replacing filter capacitors, described in this thread: https://www.avsforum.com/forum/89-sp...subwoofer.html
In the process of removing the capacitors, I believe the copper sleeves in the PCB's through-holes came out with the capacitor leads. Now the problem is worse.
I tried filling the hole with solder, but this is not working: the solder clumps to one side or the other side of the PCB but does not stay inside the hole.
My multimeter indicates that the resistance between the two sides of the same hole was in the order of megaohms for one hole(and essentially zero for another hole that I played on for a long time). That's without the capacitor installed. When in place, the large capacitor with snap-in leads does not allow access for measurements from the top side.
I don't know if this is part of the original problem, but it surely can't be helping. Also, I worry that I may have damaged the PCB or circuits by spending way too much time on it with the soldering iron, which is a basic non-temperature-adjustable one, and which has a fine tip that has been frustrating to work with.
1. How can I make sure to have good contact between both sides of the PCB holes missing their copper sleeve?
2. How can I check if there is PCB damage?
This repair has been getting increasingly frustrating, so any tips are really appreciated.