alan_m was thinking very hard :
On 08/01/2017 11:57, Harry Bloomfield wrote:
A simple remote control which uses the conductive rubber for the contact
across the PCB has failed/ become too high resistance to work - what is
the latest wisdom for fixing them please?


I've 'repaired' many by just dismantling, washing all component parts under a
cold running tap, drying with paper towel and then just leaving the
dismantled parts in a warm place (on top of a radiator/airing cupboard) for a
day. Re-assembly is the reverse of dismantling.

You may find the high resistance is from crud (contaminated sweat from
hands/food/drink) migrating by capillary action between the rubber key
membrane and the pcb. Usually its only one or two keys that stop working
reliably.

You have replaced the batteries?

I have tried washing it out before. It is an old one, little used and
with all the current 10mA passing through the button contacts.
Resistance was up in the 400K range, but the remote works if the
contacts are shorted properly.

I have super glued cooking foil over the rubber contacts and it is
working again. Easy way to check is to shine the remote at a camera and
view the image.

The cooker hood fan seems to have failed now, in the middle of cooking
Sunday dinner - something else to fix :'(