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Thread: LCD cable won't work

  1. #1
    Constant Bitrate
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    Post LCD cable won't work

    Alright, I ran the LCD cable, soldered it, tested it TWICE!!!! And when I plugged it all in for a test, it doesn't work. For some reasong my HD didn't startup so I used a Win 98 boot disk and when DOS was loaded, I have a floppy w/ LCD print and and TXT file. It sends or whatever fine, but nothing on the LCD! It's all 22 gauge wire and was tested with a Fluke. The most resistance I had was like 8 ohms. The LCD doesn't even have power, no backlight, nothing. What's wrong?!?! Thanks!

    -Kev

  2. #2
    Constant Bitrate monger's Avatar
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    8 ohms is ALOT. Plus you should have pretty even resistance with all the lines. I'm assuming that you used all seperate strand 22 gauge wire. Sounds like you may have a cold soldered joint. Find the high resistance lines and re-solder them and see if you can get a better connection.

    Depending on the length of the run, why didn't you use ribbon cable or even a hacked and slashed printer cable? Sounds like you may have to re-wire the whole job...

    either that or you cooked your LCD. Hey anything is possible.
    Monger
    ICQ-7207702
    UPDATE: I moved farther north. Now its even too cold for the deer; only moose now

  3. #3
    Constant Bitrate
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    The LCD is OK, I just hooked it up to the 1 foot parallel cable, I'm running 13 ft of cable and its shielded and grounded. Guess I'll check out pricewatch and spend some MORE money!

  4. #4
    Constant Bitrate
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    Would this work? web page

  5. #5
    FLAC
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    Originally posted by Dudah:
    <STRONG>The LCD is OK, I just hooked it up to the 1 foot parallel cable, I'm running 13 ft of cable and its shielded and grounded.</STRONG>
    the cable length will make a difference at lengths of 13ft that you are quoting. With my mp3car software developement I was using one of my 40*2 lcd's with about 2 ft of cable fine..... once I built my 10ft cable to reach from the dash to the rear hatch/boot of my suzuki I nearly tore my hair out with the LCD not working... checked wiring about eight times.....

    turned out that the timings I had set for my LCD display code on the parallel port was too quick for the cable length. slowing back the transmission to the LCD from the parallel port fixed the problem....
    Project - GAME OVER :(

  6. #6
    Constant Bitrate monger's Avatar
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    I dont think that it is a problem with the length of the cable. Mine is a good 25' with no problems at all. Parallel transfers are good for atleast 30-50 feet. I think that you just have a bad cable job.
    Monger
    ICQ-7207702
    UPDATE: I moved farther north. Now its even too cold for the deer; only moose now

  7. #7
    Constant Bitrate
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    Where did you get your cable? I'm looking and can't find any! Thanks

  8. #8
    FLAC
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    Originally posted by Monger:
    <STRONG>I dont think that it is a problem with the length of the cable. Mine is a good 25' with no problems at all. Parallel transfers are good for atleast 30-50 feet. I think that you just have a bad cable job.</STRONG>

    true.... but like in my situation if the LCD data is pumped out too quickly over a longer length it WILL cause trubbles.... now depending on the LCD software that
    Dudah is tying to use, it may be transmitting that little bit too quick.... it would make sense if he is having success with a 1ft cable...
    Project - GAME OVER :(

  9. #9
    Newbie Tech^Cellfish's Avatar
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    Magnetic is correct! Signal rate may be to fast. Most plug-ins and software has and option to control the rate or place a delay for the output to LCD.
    Car: 1995 Saab 900S 2.0 ,Sapphire GPS ,Mini-Mag WiFi antenna
    HU: Pioneer DEH-P7100R AMP: XM-4060GTX Sub: XS-L121P5
    Old car that got stolen: 1984 Nissan Cherry (Pulsar), PII-400,64MB Ram,35GB HD,Keypad,CF 634 Display

  10. #10
    Maximum Bitrate
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    the transfer rate on some parrallel ports are slower than others also, on some older motherboards it may be slower i think the standard is around 2meg but dont have anythign else to compare it too

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