Chosen Solution
My tv is an LG 50 inch I don’t have a Roku I have cable
anthonyholmes832 let us know the exact model number and what exact symptoms your TV has. Since it is an LG, I suggest to check for bad backlights first. In a darkened room turn the TV on to a channel where you have sound etc. Then use a flashlight and shine it at an angle against the screen see if you can make out shapes silhouettes etc. If so you know that your backlight is not working. This may require replacing the LCD strips inside the panel or a new power board. There is also the possibility of a bad T-con board. You will have to remove the back from your TV and check the power board with a multimeter Post some good images of all of your boards with your question so we an see what you see. Adding images to an existing question
