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A motor on my HiFi system (which is supposed to lift a volume controller) has broken. The motor is stuck and I don't want to fix the mechanical part. I assume disassembling the volume controller would cause problems.

However, I have access to the flat cable to the complete volume unit. I'd like to isolate the motor pin. The flat cable looks like this one:

Image of flat cable

(Image source - AliExpress)

The pins are really tiny. How could I isolate the pin? It would be great if this is reversible. I thought about using nail polish. This usually works well on bigger connectors. However I fear it might be too thick or be too hard to apply on only one pin. Are there other "more professional" approaches to make such on PCB changes?

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  • \$\begingroup\$ Trace the PCB tracks with a magnifier lens. \$\endgroup\$ – Sunnyskyguy EE75 Dec 29 '18 at 19:17
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Kapton tape. Cut a tiny piece up on a nonsticky backer (like taken from another adhesive product) and stick on. Also used to isolate under one pin of a QFP (unsolder, bend up slightly, stick underneath). Available at Uline and other fine online retailers.

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    \$\begingroup\$ if you have a laptop computer, then remove one of the panels on the underside .... you may find some Kapton tape holding a harness .... just cut a piece \$\endgroup\$ – jsotola Dec 29 '18 at 19:32
  • \$\begingroup\$ Thank, that sounds quite professional. I don't have found a device yet which I could open. I'll keep looking and try it out. \$\endgroup\$ – Mr.Sh4nnon Dec 30 '18 at 8:55

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