"Lostgallifreyan" wrote in message
...
Might as well throw my bit in too.

Forget diagnostics, just treat the most likely symptom; it's a harmless
excercise, and if it fails you can start doing tests.

Start by assuming that pressure on switches has caused a stress fracture
in
one of the address lines, so find the track common to the failed switch
group, then remove solder from the first switch terminal that track
arrives
at, and use a scriber to scratch the solder resist back along the track
about 3 to 5 mm, then reapply solder.

If that doesn't fix it, start testing stuff, starting with a resistance
(not continuiuty) test of that address line's track back to source.


thanks Lost,

i like to try simple solutions first myself. lots of good ideas and here
from everyone.

thanks again for your time,
rob