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Most probably, Electrolytic condenser in the Power supply to display circuit may have punctured resulting in smoke coming out. Take tv to service centre. There is no other option.
Rating the solution is highly appreciated.
I had similar problem with a 42" Soniq plasma TV.
The fault was the start up / power up circuit board at a cost of $180 Australian including labour.
The serviceman told me that it's not uncommon for him to see On/Off switches on plasma or Lcd TV's that have jammed up inside the TV even though the switch / button still appears to be working normal outside of the TV.
Ur power inverter board it dead.It have burns capacitors.Buy a new board or buy parts for replacement.U know how to solder right?Tries these websites Shopjimmy.com,Tv Repair World.com,Ebay.com,and Partstore.com.
There is a board that manages the power going into your tv I would check around with local mom and pop tv reapir shops. The board is not expensive its the labor I am not sure where you live but I am sure there are local techs that work on flat panel tv's. They are pretty affordable these days. Most flat panel tv's are rated for 60,000 hrs as there life span. Hope that helps
I have a sansui 19" LCD TV+DVD I had to attempt multiple times turning the TV on to get a picture. The sound was fine. This kept happening when I would go to turn on the set the TV kept playing fine with picture & sound but after the 2nd attemts I turned it off & then tried to turn it back on which took multiple attempts, it kept playing for a few minutes then the picture went out but the sound was still there. The set is not yet 2 years old.