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Old 05-14-2011, 05:35 PM   #1 (permalink)
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Conductive pen alternatives?

I've got a few keyboards where I need to go back over the traces, especially where the traces on the flexible plastic meet the traces on the circuit board for the keyboard. Does anyone know of a reasonably priced alternative. Pencil graphite seems to work, but it's very temporary. Is there something I can use that won't cost me twice what all the keyboards are worth but is relatively permanent?

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Old 05-14-2011, 07:00 PM   #2 (permalink)
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Old clicky type keyboards, I used flattened solder...but those are several layers of plastic with foil traces between them.
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Old 05-14-2011, 07:02 PM   #3 (permalink)
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Fine silver solder? Or foil tinsil? A mix of superglue and graphite powder/fine metal powder?
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Old 05-14-2011, 07:33 PM   #4 (permalink)
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This may work for you: Rear Window Defogger Repair Kit
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Old 05-15-2011, 10:26 PM   #5 (permalink)
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You could try conductive epoxy. Or Nickel Print, which is a conductive paint marketed by GC Electronics. I use it to paint the cavity of electric guitars to shield the guitar electronics.
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Old 05-15-2011, 11:06 PM   #6 (permalink)
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Conductive copper never seize might work too, but I like the conductive paint for repairing defrost wires.
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Old 05-17-2011, 12:51 PM   #7 (permalink)
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I've used the rear window defogger paint on CPU's in the past, it works pretty well, and is easy to apply. I would think it should work fine on flexible PCB's as well.

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