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I think the switch needs to be there at all times. Try the set with the switch turned off and see if any changes are noted.
Just because that board is new does not mean it does not have a fault. Most of these modules are actually rebuilt and I've had several zenith modules that were duds right out of the box, especially on the '80's and '90's sets. Also, try lightly tapping on the CRT neck with some sort of insulated tool. If the picture goes crazy, it's probably either a shorted CRT or something loose on the video driver module.
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