My 15-inch Mag CRT monitor (model D510) first started its symptoms with an intermittent loss of vertical sweep (single horizontal line across the screen) for only a second or two, then return to normal. Days later, new symptoms appeared: the picture would shrink to 2/3 of its original size, be off-center, and come with a decrease in brightness. At other times, the picture width and height chnge intermittently. Sometimes it would return to normal, sometimes it wouldn't. Although there is still good synchronization and the picture is still intact, it's getting such that I can't do much work with it. I suspect it's the jungle IC - STV7778. Before I replace it, is there anything else I should check? It's an expensive chip, has 42 pins and is such a bear to work on.