2600 gfx problem - colors changing when they shouldn't

[chupathingy]

I'll get right to it - there's a problem with my 2600. After it's been running for a while, the colors begin to change. The only big one I've noticed is the transition of blue to green, though there may be more. I've attached a picture of what it looks like. It's not an actual screenshot from the system, it's an approximation made from a screenshot in Stella that I doctored up in MS Paint.

 

 

Any ideas? Suggestions? Should I just throw it out?

 

I have a theory though - I'm using a stock power supply that is damaged - I have to have the cord in just the right position to get it to work. I read a post a few years ago that said these power supplies are made of bad components and over time lose resistance, thus letting in more voltage than the system can take. This can lead to an Atari Barbecue, which I fear is happening in this case.

 

If it helps at all, I'm also using a first-run Harmony cart from 2011.

 

Any and all info is greatly appreciated.

 

Thanks in advance.

[zylon]

replace the 7805 voltage regulator. This is a classic example of a failing one.