Hello ,
I have a problem eith display. Doesnt show text
I dont know what the problem. I checked all connections and the code also. And doenst want to show anything.
I dont know what the problem. I checked all connections and the code also. And doenst want to show anything.
- First things first, reduce the contrast potentiometer setting.
Aftersettiing the contrast please post your exact wiring diagram and please post your code using code tags. Less code and a wiring diagram I have no clue why it is not working. Have you tried just a simple code to see if the display works?
I also suggest you give this a read if you expect help.
Ron
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This is a very common problem which has been discussed dozens if not hundreds of times in the past several decades.
Those look like 'blocks'. Try a forum search with the key words LCD and BLOCKS.
Edit: Your photo, as poor as it is, seems to show no connection to LCD pin 5 ....
Don
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I will check the cables then. Reiwiring for sixt time , later today, and the code and i ll see. I ll post again.
I dont had time to see rules. Sorry. First time here.
Pin 5 is not connected. Only VSS, VDD, VO, E, RS , D4-D7.
Hi, @tudor_elias
Welcome to the forum.
It is not just the rules, but informative hints and procedures to help you present your problem.
In this case, your code, in code tags, and a copy of your circuit, a picture of a hand drawn circuit in jpg, png?
Hand drawn and photographed is perfectly acceptable.
Please include ALL hardware, power supplies, component names and pin labels.
Reverse engineer your project to make your schematic, sometimes that shows up a wiring error or misconnection.
Thanks.. Tom.. 
get a proper Schematic and check with your wiring
it is very likely that you missed to ground the RW pin of the LCD.
Correct your wiring and come back to us about the result.
Ok thats true. I didnt connect the RW . I thought is not neccessary to ground the RW. I will come back with updates
"it is very likely that you missed to ground the RW pin of the LCD."
Why didn't I think of that . . . .
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Update : screen working now. I had a wire who was interrupted. I checked all with the multimeter and one of it dorsnt carry the signal further. So that and RW pin was the problem. Thanks.
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Ok. Thanks all! Working now. One wire was interrupted and not carry the signal further and RW pin not grounded. Thats it ! Case closed.
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It was clearly not a contrast issue.
The way to tell is that because when there is a contrast issue,
either all the pixels will be off (which they aren't) or all the pixels/(blocks) would be on (which they are not).
In this case, only one row of pixels/blocks is on.
This normally indicates that the LCD has powered up but has not been initialized.
--- bill
.
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