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In this rather lengthy video, I repair a 1989 Cadillac radio. This style of radio was used from the mid 1980's to the mid 1990's in various General Motors cars. They came in different trim levels, with the best ones having a 5-band equalizer, searching tape deck, and 100W amplifier.
A very common problem with these radios comes as they age. There are some electrolytic capacitors on the board, which fail due to age. These are related to the right-side amplifier channels. As they become leaky (electrically leaky) they cause static, rumbling, popping, thumping and other strange noises on the right speakers. Then they begin physically leaking electrolyte solution onto the circuit board. This starts a corrosive process that damages the board.
Here, I disassemble the radio, remove the amplifier board, remove the bad capacitors, clean the board, install new capacitors, and then test / re-assemble the unit.
As with all electronic repairs, there is always a chance it will not be feasible to repair this. I have had about an 80% success rate with this repair.