Main board, swap 4 channel HDMI switch
I recently got one of these TV:s from a friend when the HDMI ports stopped working and he was going to throw it away. After reading up on this problem and finding this forum thread I think I have an idea of what could be wrong with the board. I think all the 4 HDMI ports go to the TDA19997 IC on the main board, which is a 4-port HDMI switch. If you search for this component on for ex mouser electronics its been replaced with the TDA19998 which is the same component (pin-compatible). So my thought was that obviously there was something wrong with the TDA19997 and that would explain why so many have the same error on this TV. It wouldn't surprise me if the new boards have the TDA19998 instead. But of course all this is just speculative until I get the board out and swap the component. If anyone have a new board it would help to if you could post a picture on it for comparison.