Just confirming that the TV has a lit screen (backlights are on) but no video display, is this correct?
Also is there audio at all?
Check the connections between the mainboard and the tcon board and also between the tcon board and the panel itself (be careful with these as the panel connections are delicate)
Also check if there is power to the tcon board.There is usually a fuse on the tcon where it can be measured, just to see if it is there.
No video display is either the mainboard, the tcon board or the connections in between.
What is the model number if not a UA40F5500AM?
Cette réponse est-elle utile ?