I was working on a project made by someone else. It has above mentioned LCD display which is used in 4-bit character display mode and interfaced with a PIC microcontroller. The display was working fine. One day, i unplugged interface connectors (4-pin & 8-pin molex) of display to do some work on main board. I re-connect LCD connectors after i finish the work on main board. Unfortunately, I mis-aligned 4-pin (DB7-DB4/LCD pins 11-14) connecter with an offset of one space. I powered on the system and the display was gone. Only background light is visible. Now upon start-up, LCD displays black boxes for a while in upper row and then turns white. My initial guess was that the LCD is broken. I ordered a new LCD and replaced the old one. Still I have no luck with the new LCD. I don’t know why it is not working?
I will appreciate your help in this regard. Thank you in advance.
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