Gaurdall G-LCD19B

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  • sabre504
    replied
    Re: Gaurdall G-LCD19B

    Right better pic now
    Attached Files

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  • sabre504
    replied
    Re: Gaurdall G-LCD19B

    I have tried 2 seperate power supplies and get the same result.
    I know i need better picture will do that tomorrow and will post

    I tried the LCD panel in my Xerox unit as this has no screen but comes in handy for testing ,
    but i dont have another of these boards cant even find one online it has no makers name or code just VA-3700 VER:1.1 and it is a single sided board there are no components on the back .

    But have found the monitor its a professional IT and security monitor (bit of a mix) has 1 vga 2x s vid 2x bnc i think they are called and has a hard glass front quite a nice unit in all
    Attached Files

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  • PlainBill
    replied
    Re: Gaurdall G-LCD19B

    I'm assuming you have verified the external power supply is good. If so, a better picture is a good idea. I can identify two voltage regulators, and there is at least one and possibly two more candidates. verifying they are working would be the next order of business.

    PlainBill

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  • jetadm123
    replied
    Re: Gaurdall G-LCD19B

    You say you took out lcd panel and it tested good on another monitor. Was that monitor also the same model as the one in question? If yes, have you tried swapping the logic/video card from the "good" monitor to see whether or not the card is the problem?

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  • sabre504
    replied
    Re: Gaurdall G-LCD19B

    Have checked the wires and they are working (have continuity from one end to the other s assume its ok

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  • seanc
    replied
    Re: Gaurdall G-LCD19B

    Have you ruled out the cable connecting the LCD to the main board?

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  • sabre504
    replied
    Re: Gaurdall G-LCD19B

    Just a quick pic till i get better one
    Attached Files

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  • sabre504
    replied
    Re: Gaurdall G-LCD19B

    The monitor shows only white screen but as i said that tested ok on another unit.
    The switches do nothing when connected but all the pins where the switch panel connects show voltage except the earth pin so the inverter runs constantly it is possible that someone has put in a new inverter board and not wired it correctly.
    Have checked voltages on other parts to see if supply is going in and out but these have been checked against data sheets for the individual parts and not data sheet for the board.

    I will post a pic of the whole set up when i get camera working

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  • pedro
    replied
    Re: Gaurdall G-LCD19B

    Originally posted by sabre504
    HI have a problem with this unit .
    And I'm sure that you'll eventually tell us what it is, but in the description you posted I can't detect one.

    Originally posted by sabre504
    Not sure if its a caps problem but thought someone may have a clue as to the problem.
    Firstly when power is applied (12v 4a) the screen lights up so inverter working ok .
    Took out lcd panel and tested on another unit and it works fine .
    So there's no problem there ....

    Originally posted by sabre504
    Disconnected the control switch panel and it still powers up so something is amiss on the control board.
    Why do you presume this. Many many monitors power up in the "ON" state without user intervention. With the front control panel disconnected, I'd expect it to "get up and go" normally.

    Originally posted by sabre504
    Looked online but cannot find a data sheet for the board so just wondered if anyone had come across this board (VA-3700 VER:1.1) or a similar problem before.
    Have uploaded a pic just so you can see it not a good one need batteries for camera had to use phone.
    Any help or input appreciated
    Pictures may help, but so far I'm in the dark as to what isn't behaving properly.

    Leave a comment:


  • sabre504
    started a topic Gaurdall G-LCD19B

    Gaurdall G-LCD19B

    HI have a problem with this unit .
    Not sure if its a caps problem but thought someone may have a clue as to the problem.
    Firstly when power is applied (12v 4a) the screen lights up so inverter working ok .
    Took out lcd panel and tested on another unit and it works fine .
    Disconnected the control switch panel and it still powers up so something is amiss on the control board.
    Looked online but cannot find a data sheet for the board so just wondered if anyone had come across this board (VA-3700 VER:1.1) or a similar problem before.
    Have uploaded a pic just so you can see it not a good one need batteries for camera had to use phone.
    Any help or input appreciated
    Attached Files

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