Apple IIc Video Repair

Since moving, the home office area has taken a back seat to other projects. Although it’s been fully functional, there were many unopened boxes filled with books/computers/etc. This weekend we started the process of unpacking and organizing the office stuff with the goal of understanding what kind of storage space and desk space is needed. I’ll use this info to design/build cabinets, hopefully some time in the near future.

One of the boxes contained an Apple IIc. It powered on OK, but the video signal was flaky. The video connector felt a little loose, so I opened it up and found that the connector design relied on a crimped connection that had worked loose over time. With a very hot soldering iron I was able to heat the crimped connection and flow solder into the joint.

This fixed the video problem from the IIc side, but on the monitor side the brightness knob has to be set just right or the picture scrambles. I suspect the brightness potentiometer has oxidized everywhere except where the wiper was sitting for the last 20yrs. If this is the case, then I should be able to fix the monitor by just spending some time turning the adjustment knobs back and forth until it clears up. Either way I’ll be disassembling both the monitor and the IIc (again) to fully clean them and reverse the yellowing of the plastics; I can replace the potentiometer at that time if needed.

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I’m planning to set aside a corner of the office for the retro computers (Apple IIc, Macintosh Plus, Commodore 64). As I unpack these I’ll post more details on getting them cleaned up and working again.

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