Rolling screen when watching in ant A or B or

Chances are you have a 2HDW Board that is failing. It is mounted Vertically on the Signal Board under a metal shield cover. As you look at the Signal Board from the rear, it is the Metal Shield cover furthest to the right. I would recommend a Qualified Service Person replace it to be sure it is installed correctly.
Mitsubishi's Customer Service Number is
1800-332-2119
There Parts Department Number is
1800 -553- 7278
I hope this helps,
Skyassoc