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Fault with the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/
Follow the link below and select LCD TV, Sansui, 42" in the guided search and then hit search. Select your model from the ones that come up!
Accessories
Click here and try to download the user manual to your Sansui TV, and refer it how to make a factory reset to your tV. If it do not help you, the main system memory IC might be faulty, and should be replaced.
Ur LCD inverter board it dead.Replaced the LCD inverter board.U will get ur picture back.Tries websites like Shopjimmy.com,Ebay,com to buy a refurbish LCD inverter board for the replacement.It a long board in shape.
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