Question Lg 42lb5600 Cant tell if power supply is bad or if i need new LED strip

[Hypogeum]

For a while the screen has been kind of going dimmer in the top left corner. It will flash between dim and lit. The tv has no picture anymore. The sound works. Ive tested the led line going from the board to the led strips (i assume thats where it goes) it reads 0 voltage. The ocassional times that the screen turns on for a second the voltage reads 80. The screen turns off again and it drops back to 0. With a flashlight i can see the tv's menu screen. Just dont want to waste money on led strips if the power supply could cause this too. Any opinions?

 

[howsthat]

Can't be positive but that symptom usually points to bad led/s or connection in backlight circuit.