Electronics > Repair
best method to restore conductive keypads?
Wallace Gasiewicz:
I used aluminum conductive tape. Cut dots with a paper punch. Worked pretty well.
This worked for a while. I think it wears out the traces on PCB.
BILLPOD:
I've had good results with this conductive paint. I apply it with a q-tip.
https://www.amazon.com/gp/product/B01MQ4F1T5/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1 :popcorn:
coppercone2:
anyone want to hazard a guess about how much silver powder you need to add to two component silicone to make it conductive enough to work with these pads? I do have 10 grams of silver powder for those sintering experiments that I strayed away from. I would prefer to not waste silver and I have no clue what a mix ratio might be. I noticed conductive silver epoxy does not register conductivity until it cures (with dmm probes), and the cure time of the silicone mix is very long (24 hours IIRC), so its kind of expensive and time consuming to guess.
I bought the repair kit already, but I could try the silicone silver mix if someone has a reasonable answer
eurgenca:
Isn't copper powder cheaper?
I always use conductive rubber pads with super glue and no problems.
wraper:
Clean it with dishwashing liquid first, measure resistance of conductive rubber by multimeter. Resistance should be up to a few hundred ohms on good buttons when pushing probes a few millimeters apart. If on bad buttons it's much higher than on working buttons, use fine sandpaper to remove a thin layer of conductive rubber. To do so, push the button so conductive part protrudes outside, then make a few light passes with sandpaper, measure resistance. Repeat until resistance drops <2x of good buttons, then stop sanding. You should remove just a few microns at a time. Be careful to not sand the membrane around the button as it's very thin. Clean PCB with some sort of alcohol too. Use additive repair like gluing conductive part only if conductive rubber is totally destroyed and cannot be rejuvenated by removing outer layer.
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