Jeff Wisnia wrote:
Tom Gardner wrote:

Is there any way to repair those membrane keyboard switches with the
carbon-like button that makes contact on a PCB? Sometimes cleaning
them works but not always and now I'm in danger of getting MY remote
commandeered due to a faulty remote in somebody else's possession. It
seems that there is a deposit on the PCB that is also affected and the
button seems to be non-conductive anymore.

Try lightly sanding the conductive rubber buttons fine abrasive paper to
expose some fresh material?

I'd be a bit cautious using abrasive paper. I've screwed up some
contacts by trying to clean them with emery paper in the past. If
methylated spirit and a rag doesn't work, try one of those
oil-impregnated fibre contact burnishing strips. Search online for
"contact burnisher".

Best wishes,

Chris