This is usually due to the tv's power supply shutting it down to prevent further damage. It does this when one of the other boards in the set is drawing more power than it should, indicating a faulty part on the board. This needs an experienced engineer to diagnose and repair it, and as this is a common fault with flat screens of all types, should not be too expensive, depending on the price and availability of spare parts.
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Coby tv power light turns green then red and will not turn on
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