Electrohome vertical hold weirdness (Qix)

Ice Cream Jonsey

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I have a Qix that had worked perfectly for a few months. I went to install a NiCad battery and started seeing the following weirdness:

When I turn the game on, the vertical hold is ALWAYS messed up. Doesn't matter how I had it set before, it's wrong by about the same amount each time.

If I run the self-test on Qix, I'll get to the one test that shows all the colors on the screen. There will be long black lines running down the screen at a slight angle. If I adjust the vertical hold, everything is fine.

However, it seems crazy that I would have to do this each time, because the vertical hold is a physical pot or dial, or whatever it's called, on the monitor itself.

Any ideas on what is going on with it or how to troubleshoot it?
 
More or less fixed this. Here's what I learned:

You can have the color palette up on the screen and use it with vertical hold to stabilize things. But there is a big range on the pot that will work from there, but not when I power cycle the game. I was able to find the sweet spot eventually. Still weird though.
 
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