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The TV electronics for the picture may have failed. Do you get any picture ever, like when you turn it on, or when you connect a DVD to it?
If you do then replace the scart cable with a good known brand. Cheap scart cables often do not have all the pins connected up.
Ur tv power supply board is defective.That the board where the a/c power cord go into it.Replaced the power supply board,ur tv will have stable power and work again.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.
There are two places to look for the problems, the backlight inverter board and the power supply. Look at the power supply first since it is easier to get to, look for burnt parts, bad capacitors, etc. http://en.wikipedia.org/wiki/Capacitor_plague Please post back what you find.
Your inverter boards need to be tested and serviced, these are circuits designed to control the light behind the LCD glass panel. It could also be the power supply not feeding 24volts too the inverter circuits. In that case the power board would need servicing.
Take it back if its under warranty if not get it serviced at your local repair center..
possibly external power supply faulty under load it may fail these power supplies ofen have capacitor failure open the power supply to check for leaking/bulging/swollen capacitor is around 2000uf rated at 12v