I just bought my arduino, and I was following a project with the LCD screen. The first time I used it, it was working perfectly. Then e turned it off, and at the other day, when I turned it on again, the screen had some failures. Some of the "lines" were note been showed. What could have happned? I tried to rebuilt the circuit, but it didnt work. I cant believe it has broken by itself during the night!
Did you try adjusting the contrast? Post a picture as I can't see your LCD from here.
Yes, I already had ajusted de contrast. As you can see by the picture, not all the lines are working.
This is most likely caused by a problem with the contacts between the PC board and the LCD 'glass'. Try putting some pressure on the black bezel around the display and see if the display changes.
Also, I think your backlight needs a current limiting resistor and the lack of one could be causing some power supply issues.
Don
Hey Floresta,
Yeah, the display changed when I pressed it. How can I fix this?
Yeah, the display changed when I pressed it.
Did it display the correct information?
Don
floresta:
Yeah, the display changed when I pressed it.
Did it display the correct information?
Don
Not exactly, some of the lines appearead, some of them desappeared. It changes depending on where I press it
it seems theres a lot of problems with these 16x2 lcd screens. i have a yellow on blue i think, same 'model' although im still not sure how to correctly identify them, but from your layout, its the same, different color.
mine will display fine, but it seems mine wont light up brightly enough to even read in a lit room. ive read to switch the r7 on the back, with an alternative, whatever it is, capacitor, resistor? it seems too tiny, or too difficult to find the specific part, because its like 1/16 inch long and 1/32 inch wide.
i just figured id start communicating on this forum because im trying to learn as much as i can before i start a home security system as well as a 3d printer if possible.
Saviotp:
Not exactly, some of the lines appeared, some of them disappeared. It changes depending on where I press it
It's a dud. Take it back.
eronjonson:
mine will display fine, but it seems mine wont light up brightly enough to even read in a lit room. I've read to switch the r7 on the back, with an alternative, whatever it is, capacitor, resistor? it seems too tiny, or too difficult to find the specific part, because its like 1/16 inch long and 1/32 inch wide.
Before you imagine changing the LED resistor, which should already be optimal, just check that you are actually applying 5 volts to pin 15 and 16.
And I trust you have the contrast pot set correctly in the first place? Wrong contrast (or insufficient 5V to the electronics) = dark display. Check pins 1 and 2 as well!
I've put one of these LCD's through hell (lose connections, having to bend back into place wires on the breadboard) corrupting it, dropping it once...
Still going fine... maybe yours is simply faulty...
Question, when it "worked" was it colder/warmer? failing that - disconnect it all, clean all the contacts and put it back....