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My grandparents computer is an older iMac G5. When installing an Airport card in it last weekend I noticed that a number of the capacitors were domed, and some were leaking electrolyte, a sure sign of failing capacitors, possibly because of the capacitor plague. After digging around through Digi-Key, Mouser, et al I found that the cheapest way to get a set of replacement caps is to order them from The Cap King. He sells a set of the 25 needed caps for $16 shipped, and the set arrived earlier this week.
After sorting the caps, tearing down the iMac, and removing the logic board I identified which caps needed to be replaced, marked them by type, then set about desoldering two of the most accessible ones. This is where I began to have problems.
Normally I’m pretty decent at soldering, but getting these first two caps out was difficult. The first one left a lead sitting in the board, and the other three holes still contain solder. I presume its because of the number of layers in the board and the giant planes of copper near them, but I cannot seem to get enough heat on the board to melt the solder all the way through and wick it out.
Here are two photos of where things currently stand: 1 · 2. I think the next thing I’ll try is pre-heating the board with a hair dryer, then leaving the hot air flowing over it while attempting the desoldering. Hopefully that’ll help.
