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Thread: 20x4 Problem - Odd charcters and layout

  1. #1
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    20x4 Problem - Odd charcters and layout

    Hi, I've just bought and wired a 20x4 lcd panel, I've checked continuity, checked for shorts, checked the pinouts and everything. I am wanting to use it with Mpxplay, but when I plug it in, I get the lines of blak blocks, then it goes blank when mpxplay starts, and starts displaying something. It only shows line 1 and line 3, line 2 and 4 are blank, although they shouldnt be according to mpxplay.ini. The stuff which does display is unreadable, some characters appear right sometimes, most are just weird ascii or black blocks. Brackets and dashes appear to work ok. I've plugged it in to my Windows XP machine, and get the same problem when using LCDcenter. Anybody have any ideas?
    Every now and then, there are odd words that are readable, i.e Kbps, Traffic\Outz AMBI\z\dTEMP, but still only lines 1 and 3 are working.

  2. #2
    Maximum Bitrate 2Fast's Avatar
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    Feb 2005
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    Bristol UK
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    Try running the CFAH Wintest and see what happens

  3. #3
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    Feb 2006
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    I close lcdcenter, and \\\\LCDCenterrnp\\\\ shows on line 1, then if I run that, line 2 reads jjj\Crystalfontz\jjj, line 3 is blank, and line 4 shows the alphabet in upper case up to t "ABCDEFGHIJKLMNOPQRST"
    so my screen is showing:
    \\\\LCDCenterrnp\\\\
    jjj\Crystalfontz\jjj

    ABCDEFGHIJKLMNOPQRST

  4. #4
    Maximum Bitrate 2Fast's Avatar
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    Try re-installing port95nt, and then restart.

  5. #5
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    Feb 2006
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    Surely if it was a port95nt problem it wouldn't happen under DOS in mpxplay?

    EDIT: Note to self, be thorough with multimeter. On my 6th continuity check I found that I had my blue and Blue/white wires the wrong way round, one was on ground, the other on pin 12 of the lcd, and they should have been the other way round. Dunno how I missed it, but thanks for the help anyway. It works perfectly now!

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