if your TV unit is totally went black or even a raster doesn't appear on the screen, the problem maybe the power inverter board for the back light or the back light itself must be the reason of no picture. you will need to open the back cover then look for the inverter board where the lamp is connected, check bad components like shorted FET transistor and mostly electrolytic capacitors which blow up to its casing and it becomes leak causes a low voltage and can not give enough supply to the lamp. and then next you need to consider is faulty or busted back light which the main source to illuminate light to make the screen visible. if you need parts replacement click this
www.lcdparts.net/CCFLA13D.aspx you can find here replacement part.good day and good luck hope it can help you.
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