Lg TV shows logo when start then turns gray, has sound

I have a LG 47LT561T TV. It shows the LG logo when I turn it on but immediately turns to horizontal gray and black lines. The lines are static and have same width. It has sound.

I digged into the T con board, tried to clean all the connectors, tried to connect only one side of T con then screen shows haft white and half vertical colorful lines.

Are there any solutions for this?

Thanks in advance.