4600 question

flex

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Donor 7 years: 2019-2025
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I have a Galaga with a 4600 in it. It usually has a great picture. After a few hours of play, the screen gets very orange, but you can still see the game. I tried a different pcb, and got the same thing. I tried a different monitor, and the problem went away. Is this a common problem with the 4600's and is there a fix.
thanks for any advice
 
I did reflow as much as I could see. There were definitely some weak looking solder joints, but it didn't fix the problem. It is definitely a warm up problem. It works great for about 5 minutes, then it gets very orange. If you turn it off and right back on, it comes up orange. If it cools off, then it works for 5 minutes again. Rejuv???
 
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