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Thread: MVS 2 slot video flicker w/ Big Red adapter

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    Join Date
    Dec 2019
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    PA

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    MVS 2 slot video flicker w/ Big Red adapter

    Just obtained a 2 slot system in need of a little work. The original mv2f board had some vertical line issues so I decided to swap in a single slot mv1c board I had laying around in conjunction with a JNX Big Red adapter. When powering on, the screen flickers in a vertical motion rapidly. I also swapped out another single slot board with the same result. Any ideas what could be causing this?

    After replacing the power supply with a new HAPP model, I noticed the stock PSU plug going to the MVS board has no -5 pin? The MVS harness is also missing the connection on the “jamma” connector. Unsure if this could be causing my issue?

    Pics of the “flicker” and missing pin out



    Last edited by Bigdej8; 12-26-2019 at 01:40 PM.

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