Chosen Solution

My original problem was 7 blinking lights, but I disconnected the 2 circled cables

And now it is 10 blinking lights, what board is needed to be replaced? Or is more troubleshooting required? Update (08/21/2020) I found the answer https://www.manualslib.com/manual/863928

what was wrong with it to start of with [dead set] no back light i need to know more and is it a smart tv/led/lcd give me more to work on and i maybe able to help you . i been fixing electronics for 40 years not saying i know everything but will try to help you you can email me with more details and i can see what i can do SEAMORE seamore1367@gmail.com