Problem with LCD

[davey]

Hi!

I don�t know if this is a common problem with LCD-displays, but mine is dead . On startup It only shows one line with black squares and then nothing happens. I�ve tried my code on a LAB-X1 dev-board (http://student.msi.vxu.se:3458/users/dbadt03/labx1sch.pdf) and there it works perfectly. But right now I�m using a homemade card with the same LCD as on the dev-board and nothing works. Here�s a picture of my own card with three PIC16F877A and the LCD connected to the 14-pin bridge in the upper-left corner. The upper PIC is the only one connected to the LCD, so don�t worry about the other two.
http://student.msi.vxu.se:3458/users/dbadt03/lcd_problem.bmp
On the right side of the layout you can see how the LCD is connected on the LAB-X1. I�ve tried to connect my display the same way.

I think my program freezes when it tries to check the busy-flag on the LCD. Why I don�t know.... If you look at the schematic for the dev-board there�s a LED-bridge with resistors that shares PORT-D with the LCD. The resistors are connected to Vdd, so I tried connecting the data-wires on my card to Vdd using eight 470-resistors. But that didn�t work either...

Here�s some bits and pieces from my code concerning the LCD:

[rnielsen]

The display is most likely not getting initialized properly. Either the code is not correct or the connections are wrong. A line of black squares is common for a display that has not been initialized. Check and re-check your connections and then make sure the code is sending the initialization strings properly. You might want to make a kind of break-out box and hook up LED's to each pin. Then, step through each command that sends data to the display. This might help you see if the correct strings are getting to the display.

Ronald