Facing TV Problems? Ask a TV Technician.
Hello, and sorry you're having problems. What 2 circuit boards did you replace? Was one the Mainboard? And if so, where did you purchase it from?
Thanks for the reply. The issue is with the Mainboard (the one with the AV jacks on it) having the WRONG software from the manufacture installed on it- that is why the pic shows it's for a 40"- even though your TV is a 55".
Unfortunately the only people that can change the software on the board is the manufacturer. This is in the service menu of the mainboard and it allows TCL to select the screen size which is what reverts the picture to the correct orientation. This is not a user fix and since TCL sent you the board, then you will need to contact them and diligently request they update the software on the board in order to work in your set. I'm sorry for the bad news here and wish there were a quick fix.
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Again, only something TCL can do. Since you got the board directly from them and it's not setup for your TV, then call them and send it back.
Understood, but since TCL, or a TCL authorized service center are the only ones privy to accessing their proprietary service menu, this is something that needs to be done by them I'm afraid. Sorry for the bad news here.