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Thread: 20x4 LCD problem

  1. #1
    Variable Bitrate Superduck's Avatar
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    20x4 LCD problem

    Hi people.

    I just finished wiring up a 20x4 LCD. I've done an 8x2 LCD without problems, display worked perfectly once I got all the software/drivers working properly.

    Now, First, this 20x4 had about 15' of printer cable between it and the computer. It powered up, backlight works fine, contrast is fine. I got the two rows of squares. I set up CrystalControl to display the time. The boxes flashed off then on once a second, like it's getting the update, but just flashing to a blank display, then back to the test pattern.

    So, I read that the cable might be too long, so I cut it down to about 6', still the exact same problem. I haven't double-checked the connections yet. I'll do that after work, I'm just confused why it would flash off and on like that without displaying anything.
    I also tried using LCDPrint, but the same thing. All it does when I try to print something is blank the screen. No test pattern until I open CrystalControl again.

    Hopefully someone can point me in the right direction. I don't want to have to resolder all those connections for a third time.

    Thanks in advance,

    Kris

  2. #2
    FLAC
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    Im curious on what the Parallel mode should be set @ on a 4x20 over parallel.
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  3. #3
    Variable Bitrate Superduck's Avatar
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    What do you mean by parallel mode? Like EPP or ECP?

    I'm going to test all the connections again on my LCD. I've Googled and nobody seems to be having the problem I've got, so it's back to the drawing board.

    Kris

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