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This problems,i fix alot models of tvs all diffrent models of tvs but have the same board alway dies.The LCD inverter board is dead.This board help the LCD to have a backlight to go through the Turner board to produce a picture.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish LCD inverter board for the replacement.The board is long in shape.It the easiest board to replaced in LCD tvs.
Use a flashlight to shine light near the screen in a 45 degrees angle when the TV is ON, press menu to see if you get fainted dark video in the background. fainted video indicates that the backlight is defective.
This type of failure could be due to a lower backlight inverter voltage as well.
Check this link for availability.
Let me know if you require further assistance.
Most failures on this TV are due to defective power supplies. If the TV does not turn ON, you should replace the power supply. Check this website to buy the power supply adapter and hopefully that should fix the TV.
Open the back of the TV,and look at the can shaped items on the boards.If any of them have the tops,or bottoms bulged out,they need to be replaced.This should get it working again.I hope this helps.If you have any questions,please let me know.Thank You very much!