Power supply board is dead,require a new refurbish power supply board for the replacement.Tries websites like Shopjimmy.com,Ebay.com to buy the whole rufurbish power supply for the replacement.Or if u know basic electronic's and basic soldering.Searches the power supply board for these dying,will be dead leaking gases capacitors.Replaced these capacitors will power up stable power to the tv again.These capacitors alway bulges up on it tops or puff up on it tops,that the indication the capacitors are leaking gases and it dying,must be replaced.
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