I have a 1 1/2 year old Sony LED Tv. A single vertical blue line has developed in the same spot on the screen. The blue line appears as the tv heats up, the hotter the tv (and room) the darker the blue line. The blue is intermittent meaning that is appears for 12 to 14 second intervals going on and off.

This affects all HDMI inputs, TV and BluRay.

Any thoughts on this? The interval timing makes me think the t-con or mainboard.

TIA...Rick...