Hi guys!
I'm having some troubles with a parallel connection Pololu 16x2 LCD. When I bought it, it worked fine! The next time I mounted it, it didn't worked; only two black bars appeared on half of the screen.
Some of the things I've already tried are:
- change the pins (first time I used the pins from LadyAda's guide, here);
- delay the first write on the LCD (put a
delay()
on the end of thesetup()
function); - used a power supply instead of the USB to power the Arduino (maybe it could be a power problem...);
- made a new board for the connections, because the first time I tried the display it was on a breadboard and it could have some bad connection or something like that;
- used another library (LCD4bitLibrary).
I noticed that on the back of the LCD there is place for 6 resistors (R1 to R6) and the R6 is "missing"; don't know if it should be there or if it shouldn't; it doesn't seem like that any resistor has been soldered there. I couldn't find any picture of the back of the LCD, so I can't confirm this.
Can anybody point me a solution or a tip for some other thing I should try? Can it "broken"? I'm using Arduino 0022 IDE.
I also uploaded 2 photos for the described problem: one with the black lines and other of the back of the LCD with the resistors (sorry for the bad quality of them…).
Black lines:
Resistors (R6 is the top resistor on the right side):
Thanks!