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Modding Need a Video/Screen Geek to help with mini LCD [56k Warning]

Discussion in 'Modding' started by Drachnem, 16 Jun 2007.

  1. Drachnem

    Drachnem Minimodder

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    I was going thought all my junk and I found this old LCD screen I had, it's part to I would guess a car unit of some kind but I got it free so whatevs. Anyway I wanted to mod this into my bay panel but I don't know how to power or hook up the video. I didn't see a power connection anywhere it just has a cord with a p2s connector, and so I could use some help figuring this out lol.

    Brand: Legacy
    Model: LSC56
    Details: 5.6" Color LCD Monitor (14.5CM(5.6")
    Power: DC12v 0.5A

    [​IMG]
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  2. Nexxo

    Nexxo * Prefab Sprout – The King of Rock 'n' Roll

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    A quick Google reveals that it runs on 12V, 5W and that it takes an NTSC video signal. This means that you can power it with a 12V line from a molex and the S-video output on your graphic card (set to NTSC).

    The layout of the connector can be assumed to follow the 6 pin video PS/2 standard as used on some Leadtek and VisionTek GeForce2 Ti cards. Find the layout (also Googled) here. Note that the Legacy screen has a built-in speaker, so the pin layout may be slightly different to accomodate for this (e.g. an S-Video 4 pin layout but with two extra pins for the speaker sound).
     
  3. Drachnem

    Drachnem Minimodder

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    I sent an email to legacy's support requesting a cable, but as far as power, I don't see a place to put power, or do I have to open the casing? The only visable connection is the PS/2 port, does it go there?

    I am a complete noob with this stuff, so I apologize if I seem semi retarded because when it comes to this stuff I am, so if you could maybe break it down for a noob :)
     
  4. Butcher9_9

    Butcher9_9 What's a Dremel?

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    show us some pics of the back and side

    there should be a socket for 12v power
     
  5. pccompuman

    pccompuman What's a Dremel?

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    assuming that this is for a car (likely cause of the 12 volts) that "ps/2" connector, is the connector for both ntsc and power. 2 of those wires should be for 12 volt plus, and ground. as for the other four, 2 should be for video, and 2 should be for audio. usually with car video, they have that connector, and a special cable that splits it to the appropriate connection, wheather it be video or power. youre best bet would prob be to take that sucker apart and go to town with youre mulitmeter.
     
  6. Drachnem

    Drachnem Minimodder

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    Sorry for the wait, here are more pics of the unit.

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  7. Nexxo

    Nexxo * Prefab Sprout – The King of Rock 'n' Roll

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    My guess is that it has a shared GND. So one pin for luminance (brightness), one for chromance (colour); one for sound, one for 12V, one for GND. Leaves one empty pin.

    The only way to work out which is which is by opening up and examining the PCB.
     
  8. Drachnem

    Drachnem Minimodder

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    What is PCB? looking it up.....ah the board :) I'll pull it apart and take a few pics for you.
    [​IMG]
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  9. Nexxo

    Nexxo * Prefab Sprout – The King of Rock 'n' Roll

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    Interesting: only three lines going in. By the looks of it, the red is 12V, the black is (common) GND and the yellow is the NTSC video signal. No obvious speaker, so perhaps there is no sound after all.

    Seeing as the cable can unplug from the PCB, I would do that and use a multimeter at each end of the cable to determine which line terminates in which pin of the PS/2 plug. That will help you determine its layout.

    However I would just remove the PS/2 plug, and wire the Red to 12V, the black to GND (of a molex), and the yellow to an RCA video line.

    EDIT: Some guy called AsylumJoe at xoxide.net managed to hook one up to his PC (his was a screen of the brand Mobile Authority, but same circuit board). Did not say how, but at least you know it is possible.
     
    Last edited: 20 Jun 2007
  10. Drachnem

    Drachnem Minimodder

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    I don't have a MM, and I don't know if you saw, but there is also an orange wire from the PS/2 cord but it looks like it was broken or cut. Is this multi meter thing hard to do and is the device expensive? My father used to be an electrical eng. so maybe he has one.
     
  11. Butcher9_9

    Butcher9_9 What's a Dremel?

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    multimeters are very cheap i got one for AU $10

    if you look at the pcb near where the wire go in, it has 4 solder points so that orange wire might go to the 4th solder point (maybe)
     
  12. Warrior_Rocker

    Warrior_Rocker Holder of the sacred iron

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    If you look at the PCB and the traces you should be able to easily determine the pinouts. Obviously the power input is going to go to some sort of regulation circuitry, while the video input will feed into a controller IC or some other part of the board.

    It is fairly common to see those small LCD's for cars use those connectors so they detach easily during install.
     

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