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Does it have a switching power supply board bolted to the right hand side (looking from the back) of the cabinet? If so, look for bad caps. I think I remember a 47 uf electrolytic going bad and causing a dead set.
Also, if that set uses one of those "membrane" keypads, that could very well be the problem. Try turning it on with a universal remote.
'89 was before the CRT's got really bad. I have, however, seen plenty of weak ones from the late '80's. I would say that you'll have a better chance with this one than with the newer ones.
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