On 05/01/2016 01:58 PM, Jeff Liebermann wrote:
On Sun, 1 May 2016 13:47:13 -0400, bitrex
wrote:

I think the problem may not be mechanical, as I've noticed that now the
keyboard is having issues triggering as well, which is not connected to
the same area.

Well, it wouldn't hurt to eliminate the keyboard as a possibility. Put
an ohmmeter across a row and column on the keyboard and measure the
contact resistance with an ohmmeter. Try all the button combinations.
If the resistance seems resonable, move on to looking for another
culprit.

I think I screwed something up swapping R66 on page 18 near the LCD, and
the processor is having trouble with read/writes or something.

5.6K goes to Vo on the LCD display, whatever that does. If it's
carbon comp, check the resistance with an ohmmeter. They change over
time and absorb moisture. However R66 doesn't seem to go anywhere
except the display making changes to keyboard and buttons rather
unlikely. Dunno.

R66 controls the contrast of the LCD. I had to swap it out as the new
LCD display didn't seem to be 100% compatible, and it was invisible with
the stock 5.6k resistor. 1k makes it legible again.

R66 is sitting about half a millimeter away from the deglitching cap for
IC20. I'm looking to see if I might have bridged it somehow.