Chosen Solution

Model: UN40F6300 I recently bought this television for $40 on Facebook marketplace from a guy with no reviews. Big mistake. He showed me it worked and it wasn’t that noticeable until that night. I’ve looked everywhere but haven’t found out a solution. If you’re wondering if I use a DVR or cable box, I don’t, I use it for my ps4. any suggestions could help. thank you

From the looks of it, might have some bad leds or led backlight strip. Replacement process is lengthy and tedious but doable, here is a video demonstrating the process: https://www.youtube.com/watch?v=fHhx12Ax