Ademco Keypad not working after extended power outage

[randykel@xxxxxxxxx]

I have a Ademco Vista 20SE system with two keypads (M6673). Following a
winter power outage of 4 days, one of the two keypads doesn't work,
however the system works fine with the other keypad.

I verified that the keypad is the issue by switching the two keypads
(dismount from wall and swap) so I am confident that all wiring is
fine.

On power up, the bad keypad turns on all LCD indications, lights both
the LEDS (red & Green) and then blanks the LCD display. The keypad
responds by beeping on the first 4 or 6 keypresses, but after that
nothing.

Is this a programming issue?  Visual inspection of the board shows no
issues.

Any ideas how to get this back online or is this keypad done for good?

  Thanks,
    --Randy