Hello, Thanks for the
opportunity to help.
What your experiencing is a
bad back light or inverter board.
The inverter board is a circuit board
responsible for producing the
electric down conversion for the back light. This board is found on or on the sides of the actually lcd display. these boards can be purchase for under what it would cost to repair this tv at a local shop.
Here is the part number for this board
click here
Now you may check
www.shopjimmy.com to see if they have the board in stock or not. You might also check
www.ebay.com for said part.
Working on these TV's is a skill and it takes allot of
effort to do. Please keep in mind
safety and risk while opening these tv's. We are not
responsible if you decide to do this yourself.
Remember also we are not there so there is no basic way to diagnose without a two way conversation and a look see feel approach.
The common issue is the back light or its inverter board in your case.
Thanks for giving me the
opportunity to help, Thanks for using
Fixya.com
Btw, I’m available to help over the phone in case u need at
https://www.6ya.com/expert/edwy_1a56970cf1ea4620