I believe due to recent surge, we lost an HDMI input on our VIZIO VX37L. 1 of 2 HDMI inputs is bad,(no signal) and the other is ok, but with red horizontal random lines. I have the service manual, and I'm game for component testing with a little help. I know it is likely the main board itself, or a smaller component for power regulation or signal....thanks in advance for any ideas...V