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That set may have a constant power supply to keep the CRT filaments half-way, which could possibly make the top of the cabinet warm to the touch if the room is cold, I guess. I personally don't think it should be noticeably warm though. My advice is unplug it 'til you solve the mystery. The only malfunction I can think of, which could do that if it's NOT a normal cause, would be if the degaussing thermistor is going bad and is randomly turning the degaussing coil on. That would make the front of the top of the cabinet warm for sure. But it would likely also burn out quickly, and you'd hear it humming for a second or two on & off.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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