Wanted - CPC464 membrane.
Mine has failed with certain keys not working, even after cleaning.
Stupid question, but did you clean the inside of the contacts of the connectors as well as the membrane contacts?
If the failing keys are part of a common line in the connector it can be a cut in the flexible circuit that connects to the mainboard. If that's the case, you can easily fix it with a conductive paint pencil.
Thanks everyone.
I have to clean membrane ribbon,keyboard ribbon and membrane contacts more & more frequently. Working again for now.
Will try conductng pencil next time thanks.