unfortunately there is no quick fix for this problem. your back light supply is failing
This is a very simple approach.
(Please click on high lighted words)
If too technical cost for repair is around 1-150.00
demo of inverter replacement..
First make sure to hit the menu button on the TV's remote while the screen is black, and if you have sound, and nothing is there then friend while the set is on turn a bright flashlight on and shine at angle into the set push the TV menu button if you can see a image then your back light is not working. You can also check the transformers they are close to were the wires plug into the panel, make sure all transformers read the same amount of resistance if not you have found a bad one. Now you will have to check to see if the power supply is sending 24v to the back light, if not the power supply is bad. Cost back lights around 150.00 and power supplies around 100.00. Well this should help you friend.
Here is a link to better understand the
inverter. Within the power supply the capacitors
let me know if there is anything else I can do for you!
If you have more questions please ask if not satisfied!
Only accept an answer when you are totally satisfied and willing to leave positive feedback. If I have answered your questions and met your needs even if the tv is repaired now or needs to go to the shop then please press the "accept" button. you can always reply back to me.