PR9-B LCD display wrong characters

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PR9-B LCD display wrong characters

Postby Vincent » Fri Feb 22, 2013 4:54 pm

Hi, thanks for viewing my post.

I have just bought the DIY PR9-B, finished soldered all the components. Loaded my program into the PIC, everything running correctly just some of the characters display in LCD is wrong. 'A' become 'C', 'a' become 'c' and 'P' become 'R', others character like "sswor" is fine. So when I display "Password", the LCD will display "Rcssworf".

Anyone have idea which part of my board is wrong?

Thank you.

Best regards,
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Joined: Fri Feb 22, 2013 4:44 pm

Re: PR9-B LCD display wrong characters

Postby robosang » Fri Feb 22, 2013 5:29 pm

Seem to have a standard pattern of error.

If possible, take a clear photo of LCD pin soldering, top and bottom. Show it to us.

LCD is getting character in ASCII format. Study and list out what is the value of ASCII 'A' and 'C', ASCII 'a' and 'c', ASCII 'P' and 'R'...... you might find something there. :mrgreen:
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Joined: Wed Jun 10, 2009 5:37 pm

Re: PR9-B LCD display wrong characters

Postby yonghui » Sat Feb 23, 2013 1:17 pm


try to check mayb one of the LCD pin is not solder properly?
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Joined: Mon Sep 28, 2009 3:27 pm

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