. This heat, however, is not a defect and does not affect the TV's functionality. HD channels will have black bars on either side of the screen when displaying upscaled SD (4:3) content. Black bars will appear at the top and bottom of the screen when you watch movies that have aspect ratios different from your TV. Adjust the picture size options on your external device or set the TV to full screen. The output resolution of the attached device is not supported by the TV