Facing TV Problems? Ask a TV Technician.
Hello, my name is***** to Justanswer! Give me just a few minutes to look up some specifics, I'm working on this now.
When you replaced the main board, something may have fried the digital HDMI circuit. Check the yellow input, and tell me if that one works.
Don't worry about the call, those are automated emails from a computer. I'm looking into the service reset.
Click here. It's the complete service manual. The answer has to be in there somewhere, I'm looking now.
Open that document, and press CTRL+F. Type reset, and it will show you all of the available resets. There are a lot.
It doesn't seem to be that easy for this one. There is a service remote, and manual resets for each board.