To properly connect to your HD TV, please play the video on the Tablet device and then press the Menu button to output the signal.  You then need to wait for the display as it can take 1-2 seconds for the image to transfer to the secondary display.

The HDMI port can be quite sensitive so it is advised that you only use certified HDMI cables.

Please also ensure that the HDMI jack does not contain any dust particles or otherwise.

 The output resolution to the secondary display is 720p.  Although the original video format is 1080, the Tablet 6000 converts the output resolution to 720p.  The Tablet 6000 will display 1080 resolution on its screen.