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dbarnhart97

Odyssey 4000 no video output

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I got an old odyssey 4000 from an attic a month or two ago, and I've been trying to get it working. I have the service manual and I made an attempt at an av mod based off of a thread I read here. The audio works,  the system starts, and it seems like the game is running, but there is no video output to the tv. There is also not the voltage the service manual says I should have at the video out pin,  or anywhere I can tell it connects to. Can anyone advise on what to check?

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Hmm... The Odyssey 4000 apparently uses a AY-3-8600 game chip, with color from a AY-3-8615 chip. According to the databook (page 486) video out on the 8615 is pin #5, you tested this one, right? Besides that there are a few traces between the two chips, and the clock signal circuitry (if the game plays then the clock circuitry should be fine.) Also, what thread did you base your composite mod on? It may be that the 8615's outputs need amplification or adjustment before the TV can process them.

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