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My vote would be for a bad cap in the vertical circuit. Don't run it for long as-is unless you can turn the brightness down (which you probably can't without accessing the menu.)
Search the circuit board for the vertical section and look, you might get lucky and see obvious signs of a faulty cap (leakage/corrosion around the base, a bulging top) otherwise you might have to just replace all the electrolytic caps in that circuit. Not a huge ordeal once the board is pulled. You can get those parts at RadioSchlock, though there are cheaper/better places. If it blew a transistor, though, you have a problem out of my league!
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Bryan
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