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Thread: Interfacting 4x40 HDD780 LCD with Printer port (Parallel Port)

  1. #21
    Maximum Bitrate Jarrod's Avatar
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    Already asked my supplier, no help at all with inverters and power.

    Heres it all the info I can gather from the LCD besides the pinouts:
    It has a built in button above (or below, not sure) the LCD panel.
    Pinout has a lock-in type connection.
    Printed on board: GEB-2294V-0 S LCM-5044
    Two HDD44780A00 Chips, one with a sticker saying "-68 HF 001" on it.
    8 chips that look the same, but only four have "OKI Japan M5839B 9910" printed on them.

    Any help there?

    Also, with that circuit, can it input -5V and output -2.5V ? I cant understand the info sheets, too complicated for me

    Thanx.

    [ 02-07-2002: Message edited by: Jarrod Bell ]
    Jarrod - Holden VX S!

  2. #22
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    I did a search on the LCM-5044 and all I found was others looking for pinouts for it,too.

    As for your 2nd question, yes you can input -5 volts and adjust the variable resistor 'til you get -2.5 volts .
    If it ain't broken, open it to see what makes it "tick".

  3. #23
    Rob
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    Maximum Bitrate Rob's Avatar
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    Originally posted by Jarrod Bell:
    <STRONG>The info on that chip says its adjustable from -1.2V to 30 something volts, which means it cannot go down to -2.5V which I require. Also, what voltage does it require to begin with?</STRONG>
    Sorry about that, as Miel said the web page I mentioned had left out a minus sign. I just did a quick search to fined some wheer that sold them, to point you in the correct direction, and it came up first, I should have check to see if it was correct. I've used the chip before and it'll work fine.
    And you say people actually pay money for M$ Windows?
    www.mp3mini.co.uk (Does what it says on the URL) www.openclassic.co.uk (The new car, with zero rust!) www.rob-web.co.uk (My other site)
    Total re-design underway: on the whole progress is very slow as the car is taking up too much time :)

  4. #24
    Maximum Bitrate Jarrod's Avatar
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    Ok thanx for clearing that up
    How much would it cost for someone to make the negative circuit and send it to Melbourne, Australia? Because I am not very good at electronics, so any help would be appreciated.
    Also, anyone got ANY ideas where I can find a backlight inverter for my LCD that has two outputs of 100V AC?
    Jarrod - Holden VX S!

  5. #25
    Maximum Bitrate Jarrod's Avatar
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    ok, I have gone out and bought the following items:
    2 x 10uF capacitor (electrolytic)
    1 x 120 Ohm resistor.
    1 x 10k var. resistor.
    1 x LM337 variable voltage regulator.

    multimeter, solder, soldering iron, small PCB.

    Is that all I will need to make the -2.5V from -5V ?

    I have emailed ergpower.com about a backlight inverter, stil no reply, slow ppl.

    Any hints on soldering? havent done it in ages!
    Jarrod - Holden VX S!

  6. #26
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    Yes, I do believe those components are OK.
    Just make sure to observe the correct polarity for the caps and the LM337.
    Connect -5 volts at the input, do not connect anything at the output, then adjust the pot for the right value.

    Go herefor a solder tutorial.
    If it ain't broken, open it to see what makes it "tick".

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