@legacytech looking at that clip and notching the well defined top and bottom border of the area on question, this looks like a Panel issue (gate driver). With a backlight issue, the borders would not this well defined.
+
@legacytech looking at that clip and notching the well defined top and bottom border of the area on question, this looks like a Panel issue (gate driver). With a backlight issue, the borders would not this well defined. Furthermore, your TV uses Edge backlighting, meaning it gets the backlight from the top and the bottom. If one (or even two) of those LEDs would have failed your picture would have been dark from either the top down or bottom up, but not somewhere in the middle.
I would start off by removing thew back cover and checking all of the ribbon cables. Remove those, check for corrosion, tears and any other damage. Next check the driver boards (long skinny boards) that connect directly to the LCD. Check for any area or component that looks damaged etc.
You can always post some images of anything that appears odd with your Question. That way we can see what you see.
@legacytech looking at that clip and notching the well defined top and bottom border of the area on question, this looks like a Panel issue (gate driver). With a backlight issue, the borders would not this well defined.
I would start off by removing thew back cover and checking all of the ribbon cables. Remove those, check for corrosion, tears and any other damage. Next check the driver boards (long skinny boards) that connect directly to the LCD. Check for any area or component that looks damaged etc.
You can always post some images of anything that appears odd with your Question. That way we can see what you see.
[guide|21499]