What does a working TMSS indicate? (MD/Gen repair)

Discussion in 'Sega Discussion' started by segasonicfan, Feb 18, 2019.

  1. segasonicfan

    segasonicfan Robust Member

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    Hey everyone,
    I have a Genesis 2 (VA0, 315-5660-02) that I'm repairing, mostly to learn from. It was in my parts been for a while and I removed almost all the ICs only to replace them just now. The system now boots to the produced and licensed screen but then immediately goes black. No audio, but I think the amp is probably fine.

    I'm curious to know what the system checks for after this stage. I'm not really sure which chip to suspect is faulty in this situation. I've triple checked all traces and solder points.
     

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