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Thread: Garbled graphics with MVS 1 slot

  1. #1
    Timid Neo Newbie

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    Garbled graphics with MVS 1 slot

    having trouble with one of the arcade cabinets. It's a 1 slot MVS that has been refurbished lately. The symptons are the following:

    1. Test screen is perfect (see image)
    2. When game starts there are vertical (and horizontal) lines across the screen (this seems to vary between reboots/inserting removing cart)(see video)

    The following has been tried already:

    1. game(s) tested with another MVS -> games are ok
    2. Cleaned the cart slot throughout -> no help
    3. Bought a new mobo (that has been tested) -> same problem -> mobos are ok
    4. Measured all the voltages -> all within specs -> psu is ok

    I'm totally loosing it. What an earth can be wrong anymore? The Jamma harness?

    All help highly appreciated
    Last edited by emuola; 02-08-2018 at 08:58 AM.

  2. #2
    Genjuro's Frog
    scgon's Avatar
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    my guess would be that the contacts on your motherboards cart slot are dirty, find something you can get in there to clean them up, like a thin cloth with rubbing alcohol on it and a ruler or something...

  3. #3
    Timid Neo Newbie

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    But with both mobos? The second mobo was tested with 3 games before swapping it to the cabinet? Weird. I forgot to mention in the "sone already" that we cleaned both connectors (jamma and cart) and same result.

  4. #4
    Genjuro's Frog
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    oh I missed that, it looks like some of my games look if the carts are not seated well, or cart contacts are dirty which is why I suggested it. perhaps clean and reseat your jamma harness? I would think its something simple and goofy. so carts work somewhere else, 2 mobos with the same issue, so it's the cab wiring maybe... did you try your mobo in a different cab?

  5. #5
    Timid Neo Newbie

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    Quote Originally Posted by scgon View Post
    oh I missed that, it looks like some of my games look if the carts are not seated well, or cart contacts are dirty which is why I suggested it. perhaps clean and reseat your jamma harness? I would think its something simple and goofy. so carts work somewhere else, 2 mobos with the same issue, so it's the cab wiring maybe... did you try your mobo in a different cab?
    Haven't tried the mobo in a different cab yet. I'll take time to do that this weekend

  6. #6

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