Invertor board problem.check capacitors in the power supply if they swollen replace them with new ones if not change invertor board.
You may have bad power suply or bad back lught inverter board, need to so some inspection inside.
If you are going to DIY and have proper tools and know safety precaution then please read on:
Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
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