Hi @effortenergy,
It seems like it is a mainboard problem more than a tcon board problem.
It is more likely the mainboard as it that controls the signal output to the screen via the tcon
If it were a tcon board problem you would have no video at all every time or vertical lines from the start rather than the logo being OK every time? with no problems then vertical lines and after that a blue screen. Also usually a solid blue screen indicates no signal received on a lot of TVs and the logo works because that image is provided by the eeprom on the mainboard.
Best I can suggest is that you order a replacement mainboard from a supplier that accepts returns for a minimal restocking fee to reduce the cost to you if it is not the problem.