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Is this set only 4 yrs. old you say? There are zenith sets from the mid 1990s that had a lot of bad picture tubes but this is probably newer...this sounds like a problem in the switching power supply of the set, will need some troubleshooting to find out what. Don't think it is just a simple fix. Could be bad electrolytic capacitors, they can go bad just sitting on the shelf or just sitting in an unused TV set. Heat also aggravates capacitor degradation, if this was in a school book room likely the temperature got very hot in the summers.
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