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The Sega Genesis (also known as the Mega Drive) is Sega's most successful video game console.

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Power switch only works sometimes

I have a Sega Genesis (model 1) that has some issues with the power switch only turning on sometimes. It takes a few tries of turning it on and off again before the on light even comes on at all, but even then it doesn’t come on in the on position, only when I’m halfway through turning it off again. With enough back and forth it does come on properly, but it’s been taking progressively more time for it to do this (was fine when I pulled it out of storage ~5 months ago).

I’ve also noticed it’s got some other issues. The video kind of flashes brighter and darker on some scenes, mostly on menus. My other tv shows wavy lines that get worse the longer you play. Probably just the tv, but it’s annoying nonetheless.

I’m currently using an adapter I got at Goodwill, not meant for the system but it’s the right voltage, amps, and I’ve switched it so the polarity is right. I’ve had the entire system apart and made sure the outside part of the switch was lined up with the inside. Everything looked fine inside, nothing damaged. I’ve cleaned the adapter in port in case that was corroded. I’ve tried moving the wires around in case of there being a loose connection, same thing with the tip of the adapter. I’ve tried the adapter from my Sega CD (it seems to fit better). It could be something just inside the console because once I accidently touched the adapter tip while it was on and it rebooted, but I really don’t know. Any ideas?

Edit: Circuit board

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Annaliese P  what a great console. Don’t give up on it. The issues described by you, sound more like corrosion on the circuit board as well as failing capacitors. Given the age of this console it is not surprising. I suggest a really good cleaning with a soft brush and some 90%+ isopropyl alcohol. Then do a recap (replacing the capacitors) and see where this takes you. Post some good pictures of your PCB with your QUESTION. That way we can see what you see. Adding images to an existing question

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I've uploaded some pictures of the circuit board. I had already cleaned it inside beforehand but I tried it again anyways though no dirt really came off of it. I checked all the capacitors to see if they were bulging but as far as I can tell they aren't. The only problem I can see is that the switch has a rusty spot near the base. I don't think the problem is actually getting worse like I thought it was, as the power switch seems to work fine sometimes, but other times it acts up like how I described.


I had the same issue, the actual black plastic switch on the top lid was to blame - it has 2 small "posts" in the hole that goes over the motherboard's switch that help keep it in place, and they had worn from years of use. I would up putting a "cap" of shrink tube on the white power switch, so when I put the lid back on, it would jam into the plastic power switch and keep everything snug with no wiggle, which works now 100% of the time.


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Annaliese P será eternamente grato(a).
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