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Thread: Same strange problem

  1. #1
    Newbie
    Join Date
    Feb 2001
    Posts
    8

    Post Same strange problem

    Hello all,

    I went out and picked up another hd44780 40x2 lcd.

    I got it all soldered up, and plugged it in. And it is still acting funny.

    When I initially start the plugin, the boxes are kind of light, but I will see darker strips popping up randomly all over the place.

    If I take the parallel plug out, and lightly plug it back in, I start to get the normal contrast, but all garbage characters flashing and scrolling all over.

    NOw, OCCASIONALLY, I will see some good information. For a brief second I'll see the artist name, or time remaining. But it's surrounded by junk. If i stop the plugin, and restart it, I'm back at square one, and need to unplug the parallel port slightly, and then plug it back in lightly, leaning a lot on the right side of the plug. Using the winLCD plugin, I've turned the delay up to 1000000....using lorty's, i've turned it up to 100 with no effect.

    I have pin6 on the lcd going to pin1 on the parallel port, and then in sequential order to pin9 on the parallel port going to pin14 on the lcd. Pin4 on the lcd is going to pin16 on the parallel port. This is all correct according to the schematics i've read.

    Could anyone please clue me in on what's going on here? I'm quite frustrated, and have run out of ideas in my own head.

    Thanks!

    John C.

  2. #2
    Variable Bitrate peter3's Avatar
    Join Date
    Feb 2001
    Location
    The Netherlands (deventer)
    Posts
    238

    Post

    maybe u can try a divrend lcddriver plugin for the 40x2
    i use vis_LCDisp and it works fine with me
    If you can't find it let me know and i will mail it

    Peter3
    peter3@pveen.demon.nl
    PETER - THE NETHERLANDS - DEVENTER
    sproggy 2.8,epia c3-800,20Gb 2.5", 5.6"lcd,touchscreen.

  3. #3
    FLAC DodgeCummins's Avatar
    Join Date
    Oct 2000
    Location
    DFW area
    Posts
    1,386

    Post

    you are describing a mechanical/solder problem...like your parallel port is damaged, or the plug is poorly connected.

    What is your parallel port set to in bios (ECP)?
    are you using those settings (IO) in the lorty plugin?

  4. #4
    Newbie
    Join Date
    Feb 2001
    Posts
    8

    Post

    Dodge,

    Thanks for the verification. That's what I assumed, but here at home, I don't have another Win9x or Linux machine to test it on.

    I'll find another machine and give it a try.

    I'm sure the soldering is pretty solid, as I have two units that are doing the exact same thing.

    Thanks again for the tips, I'll post it up if I get it working on another machine.

    Thanks!

    JC

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