Chosen Solution
I power the TV on and get bright power LED. Connected receiver turns on as usual (CEC working) then power LED fades to super dim. I opened the back up and haven’t seen any obvious signs of damage (blown caps, etc.) but I did find a “spare” screw laying on the main board down by the inputs. I’m just looking for some ideas as to what to replace first. My thoughts are that the main board is the culprit but also the most expensive piece to replace. The fact that my receiver is still told to turn on and that I can power on the TV by pushing the home button on my Roku remote makes me think it’s not a power issue.
Turns out it was the main board. I ordered a new one ($150) and slapped it in. Powered right up. I will say, the back side of the faulty one looked like someone dumped baby food on it then tossed it in the oven. This TV had not been off it’s initial setup place since I bought it, so nothing has happened to it since I’ve owned it. To add a bit more clarity, the backlights were not turning on before this was replaced. The loose screw hanging out in there definitely helped make my decision on ordering a main board first. I initially thought it was the power board before tearing into it. Be aware the main board for this TV comes in two flavors depending on the first part of your serial number.
@davezonk so it powers on and you can see the backlight turning on? You get no video and no audio? I’d be suspicious of this “spare screw” on the main board. It is entirely possible that it shortened out the main board. Start by measuring all the voltages going from the power board to the main board and see if these correspond with the values printed on the power board. Let us know what you find out. Of course you can always post some good pictures of your boards etc., with your question so we can see what you see. Adding images to an existing question
