You're backlight inverter is faulty.
You first need to check your power supply and ensure you have 24v output to the backlight inverter.
If you lack the 24v you will need to replace capacitors in-line to the 24v rail to get power back to your backlight inverter.
Look for these:
If your 24v is OK then you will need a replacement inverter to restore your picture to your tv.
Best of luck!
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