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Thread: Hard wiring screen

  1. #1
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    Hard wiring screen

    I'm having a hard time figuring out the wiring for this monitor that I got. I would say it's a Lilliput but I'm not positive because there's no Lilliput label on it at all. It looks exactly the same as ones that I look at on here though. Anyways, it's a 8" touch screen that I'm mounting in my 07 Jetta. Fits right in the dash and all of the other components do too. The supplied cable for the monitor is just way to long though so I decided to cut it and remove the connector (it was in the way too) and just solder the wires to the circuit board. Only problem is as I'm tracing the wires something just doesn't seem to add up. There's a grey and a shielding that don't get a reading correctly but the grey seems to turn to a blue wire further down the line if I test from one connector end to the other. Here's some pictures to try to better understand what I mean. Either I have a bad cable that was made wrong or ...??? I'd like to hook up the rca's too for a possible second input like a video camera or something for later use but that shouldn't be a problem. If I remember right they pinned out fine. One other thing too, there's the power hook up mounted on the board and there's another one connected to the connector into the board. Are they different? Which one should I connect to?

    -1st pic is of the board with the connector removed.
    -2nd is what I pinned out from the connector on the board to the wires out of it
    -3rd is the cable laid out
    -4th is the wires that are the problem so far and the connector that goes to the monitor
    -5th is what I pinned out that doesn't seem to match up

    Right now all I'm worried about is getting visual and touch use out of the screen. Hopefully someone knows what's goin on. Thanks!
    Attached Images Attached Images      

  2. #2
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    bump... anyone have some knowledge I can get some help with?

  3. #3
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    I know you've already gone through the effort of desoldering and cleaning it up, but I always check the pinout as assembled (using a probe on the connector end and one on the board). A lot of manufacturers change cables like you are seeing and they always don't match up color for color.

    If you remember which colors matched up to the board (image 1), you could assemble the cable and then re-engineer the connections all the way from power, rca, usb, and vga back to the wires sticking out of the connector that you desoldered.
    Nick - 08 GG Element
    Custom 3D-CAD Design, Reverse Engineering and Fabrication

  4. #4
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    I actually started to do what you just said but to me as I go through each step of the cable there's a fault somewhere. I think there's no connection between a wire and a pin in one of the connector ends. I think it's where the vga cable connects to the screen cable. It makes no sense at all why there would ever have to be a split in the cable at all though. To me it's dumb. I'm getting a readout for all the pins on one side of the connector but no reading from just one wire and one pin on the other side. Of course when I connect the two and read from the new ends I'll still get the negative reading cause there's still the fault present. I'll just have to see what I get for the other readings first. I was just hoping someone already did this before and would give me some insight on if they had the same problem too. Thanks alot!

  5. #5
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    No problem. I know sometimes one gets too stuck in the details and it helps to step back a little and try the basics again. At the worst, it points you in a new direction. Good luck, it sounds like it will be really nice when done.
    Nick - 08 GG Element
    Custom 3D-CAD Design, Reverse Engineering and Fabrication

  6. #6
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    bump... anyone know the pinout at all? It'd help alot. Been kinda puttin this off cause I'm not 100% positive. Now I want it finished

  7. #7
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    did you end up with an answer? I did exactly the same thing you did (chop cables) and ended up with a new motherboard and a new touchscreen controller... I realized that the shields on the vga and usb were creating a short when connected. Toasted my VIA sp13000 mobo. I should've gotten a better pinout diagram built before I chopped...
    Is there a definitive diagram out there?

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