Quote:
Originally Posted by old_tv_nut
If you have two complete images squeezed vertically, the vertical frequency is half the normal rate.
If you have only the lower half on top and the upper half on the bottom, it's a sync problem.
Pictures are helpful if you can post some.
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It's not always a sync problem... sometimes it's the frequency at double the normal rate at least if the bottom half and top half of the image both fill the screen and overlap each other nearly completely...I had that years ago on a Zenith with bumble bee caps that instead of learning to read I replaced based on Sam's info which contained typos. If you can carefully adjust the vertical hold and get a single image that wants to roll in either direction and won't hold lock for more than a second then it's definitely a sync problem.