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Thread: Monitor testing

  1. #1
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    Monitor testing

    Hi
    I have an old Olympic Pokie that I brought to Mame but as usual I like to see if it can be fixed first. Reading archives on here and the net it looks highly unlikely.
    First thing is to see if I can get some video happening to see the fault list.
    When I turn it on I get the display of vertical lines in the first pic. (Sorry pic has rotated 90 deg and I can't turn it back)


    I don't know if it is a monitor fault or a video output fault.
    The monitor is a RGBs (Red Green Blue Sync Earth), so to test this, I plugged it to a 60 in 1 card to provide a RGBs signal in to the monitor..
    I get the second pic.(Sorry again pic has rotated 90 deg and I can't turn it back)


    Should that have worked?
    I didn't use screened cables and the 60 in 1 was supplied through an old computer power supply. The Screen was powered through the Pokie power supply as it has special plugs and I think is 110Vac (didn't check yet but on drawings). I was hoping to see some image, maybe not great due to the rough connections but something.
    If I connect only one RGB signal at a time I get the similar image in that color only as expected.

    If the images were the same from either source, then I would say the monitor is U/S or if the 60 in 1 worked the video out is U/S.

    It would be great if anyone could tell me what the images are caused by and push me in the right direction


    Cheers
    Andy
    Attached Images Attached Images

  2. #2
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    Can you get to the adjustment pots on the monitor chassis? That could simply be a vertical and horizontal hold issue. It might be something worse, but the first step would be to try adjusting the holds to see if you get a stable image.

    Are you sure the monitor is 15khz? A lot of pokie monitors were 31khz, depending on the age of the pokie. If you post a good picture of the monitor chassis, someone will be able to ID it.

  3. #3
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    Thanks Nama
    wasn't aware of the different 15/31 kHz freqs. I'll get some pics but I'm thinking your right.

  4. #4
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    Definately 15kz monitor..
    First picture has the remote board under the front of tube.
    HOLY GRAIL

  5. #5
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    Also check 60in1 is set to 15 too
    you can always expect change in life..except from vending machines

  6. #6
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    Thanks to you 3 guys the screen now shows the 60 in 1 output. Did need setting to 15kHz. Thankyou.

    While that's good news it now means unless there is a dip switch on the Pokie board set wrong or a wiring problem between the board and the monitor, the Pokie video out is U/S and the machine is not repairable.

    There is a multi Dip switch but no idea if it even has anything to do with this, any suggestion would be welcomed.

    I will check the wiring over the weekend.

    If anyone knows something else to try, please let me know.

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