Check where the flat ribbon cables that go to the screen come from.
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If the main board has a cable that goes to another board (not the power board) which then has 2 (or more) cables going to the screen then that board is the tcon board.
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If the mainboard connects to the screen (2 or more cables) then the tcon is inbuilt with the mainboard.
The tcon is integrated with the mainboard
If you haven't already replaced the mainboard that would be the first thing to do.
If no good then it may be the driver board that the mainboard connects to but you can't replace them that easily as the cables from them are attached to the screen and are very fragile.
Hi @vraptor
The tcon is integrated with the mainboard
If you haven't already replaced the mainboard that would be the first thing to do.
If no good then it may be the driver board that the mainboard connects to but you can't replace them that easily as the cables from them are attached to the screen and are very fragile.