The T-CON board
is the place to start. If everything else is working (i.e. change channels, sound, etc) then this is almost certainly the problem.
\012It's possible the problem is the connector(s) to the T-CON board. Over time the connections
start to lose good contact because of heating/cooling or contamination on the pins.
\012IF YOU KNOW HOW TO WORK WITH ELECTRONICS REPAIR(replace board ) or have a friend with knowledge/skill you can fix it.
\012The T-CON board is located in the center of the back probably behind some metal shielding.
\012After you remove the back cover and get to the board, disconnect the flat cables and carefully reconnect them. Be careful doing this since the connectors have a lip which holds them on and you do not want the damage them. You may temporarily test the set before reassembling it to check the fix.
IF this does solve the problem then turn off again and UNPLUG the set and disconnnect/reconnect the flat cables again.
\012If you are not making any progress in the fix then you may replace the T-CON board.
\012You can search for a board at;
\012other sites in your country
\012(p.s. Since you have the back cover off, take a look at the caps on the power board))
\012The board looks something like;
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