LCD 20 X 4 Problem

Discussion in 'General Electronics Chat' started by camerart, Apr 19, 2015.

  1. camerart

    Thread Starter Active Member

    Feb 25, 2013
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    Hi,

    Does anyone know what the problem is with this LCD module? Is it repairable, or do I get a new one?

    Camerart.
     
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  2. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    I might be wrong but it could be a software issue.
     
  3. ericgibbs

    AAC Fanatic!

    Jan 29, 2010
    2,500
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    I would say the line addressing for the LCD map is wrong within your program.
     
  4. camerart

    Thread Starter Active Member

    Feb 25, 2013
    517
    30
    Ok, I just connected it, with an old program.

    Thanks, Camerart.
     
  5. camerart

    Thread Starter Active Member

    Feb 25, 2013
    517
    30
    Hi,
    I checked the connections between the circuit and LCD, they are ok.
    I tried the 18F4520 PIC in a separate circuit and it shows "LCD TEST" on all 4xRows, so the Program is ok, the contrast is ok.
    It seems to me that it is a problem with the LCD, does anyone agree?
    C.
     
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  6. dannyf

    Well-Known Member

    Sep 13, 2015
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    You bet.
     
  7. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
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    Something like that happened with a 2X16 LCD I had 4 or 5 months ago . One display worked fine; the other didn't. I could probe the zebra strips and make the missing pixels show life, but it certainly wasn't worth keeping that display.

    John
     
  8. camerart

    Thread Starter Active Member

    Feb 25, 2013
    517
    30
    Hi D and J,
    I've ordered new ones!
    I have a few similar, and may try twisting the though circuit butterflies and see if alcohol fixes them. (Or ME:)
    Thanks, C.
     
  9. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
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    Anything is worth a try, but I have been singularly unsuccessful in fixing one of those zebra connectors. If I were to try something, it would be a very dilute solution of liquid laundry soap in distilled or deionized water (no fragrance or dyes would be my preference). In other words, threat them like vinyl lettering on a glass surface.

    John
     
  10. camerart

    Thread Starter Active Member

    Feb 25, 2013
    517
    30
    Hi J,
    Soap may be ok, or it may leave a film. I'll try alcohol first them soap, and let you know.
    C.
     
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