We have a fire monitoring/management panel which has a 40x4 character display attached to provide information in the event of a fire.
It has recently started "glitching out", it displays random characters/glyphs for split-seconds in random places on the display. These are valid alphanumeric characters (not just random pixels etc), which leads me to think the LCD controller is damaged, which happens to be on-board the display PCB.
We have had a quote provided to replace the panel, but we'd much rather replace just the character display (huge difference in price).
I'd like to make sure however, that the display is the part malfunctioning.
What are your thoughts?