The earlier 400's had the LCD TV monitor mounted flat against a hinged swing out cabinet. While sitting on the sofa, the angle of view was lower than optimum for a bright clear picture. Mainship later started using a swivel mount for mounting these TV's which solved the problem. If you have one of these older 400's with the verically mounted sets, there is a swivel mount made by Peerlees Industries that works very well in this application. The mount keeps the TV close to the back of the cabinet while allowing a tilt of 15 degrees down. This makes viewing the picture possible even if laying down on the sofa.
The mount is a Peerless Industries, model ST630. More info can be found at: