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Colecovision composite mod degrading?

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I have a Colecovision with a mod for composite that I installed a couple of years ago. I think I bought the mod on ebay. Lately I am noticing some red bars on the screen. Is this a common failure? What should I check?

 

 

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If this is using the old Ben Heck mod, I had a problem with mine not too long after I had installed it. Basically the transistor essentially burned up due to the +12 applied to it and no where to sink that heat. Not saying that is the same here, but I was happy to switch it out with one of the other kits later on.

 

 

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