You could throw a rock in any direction and hit someone that knows more
on this topic than I do.  But in my limited experience, if 'junk' appears
on the pins of an LCD display, just about anything can happen, most of it
defying logic.  Try checking

Power up sequencing

Double check what you're actually sending the display

Check for adequate timing between rise and fall on enable line.

On Fri, 6 Nov 1998, Steven Kosmerchock wrote:

> Friends, > I am using an LCD (2X20) to display some results of a test
performed by a PIC16C65A. The PIC performs all of it's tests and display's
the appropriate data for the appropriate tests. Unfortunately, the first two
spaces on the top line seems to have an incorrect character (It's supposed to
be blank). The funny thing is that when I unplug the LCD from it's socket
(leave the PIC circuit powered up) and then plug it right back in, the
"trash" characters aren't there anymore. But if I turn off the whole circuit
and then restart it, the "trash" characters are still there. It's a mystery
to me!? I would appreciate any/all help I can get!! Thank you all! > > Best
regards, > Steven > > > Steven Kosmerchock > Email:
steve.kosmerchock@celwave.com > www.geocities.com/researchtriangle/lab/6584
>