I hate to reply to myself, but there is another failure that will cause the LCD display to go nutty, if the +5V logic supply is not regulating properly, and is up around 5.5V, the display will do just what you are saying.
-Chuck
Chuck Harris wrote:
Hi George,
There are two problems with the 2100 families front panel. The LCD,
and the keybuttons. The keybuttons were not properly debounced for the
long haul. As the switches get older, the bounce time increases and the
keypad logic starts to generate multiple switch entries for each press.
The fix is to replace the two 1uf tantalum caps on the front panel (C5 and C2) with
good quality 2-5uf tantalum caps (ceramic would be better).
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