DirecTV H20 Mode D'Emploi

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If your TV supports all formats (1080i, 720p, 480i and 480p), then your cycle would also include 720p. 
If Native is turned on, the FORMAT key cycles through Stretch, Letter and Crop for the current TV 
program’s native resolution. Th
  e  FORMAT key allows you to easily cycle all resolution and format 
settings with a single key until the picture displays the way you like it. Navigating menus to modify 
settings is not necessary.
If pressing this key causes a loss of video and audio, continue to press it until the picture returns. (Wait a 
second between presses to allow the Receiver to change the resolution.) Th
  is can happen if your settings 
include a resolution that your TV doesn’t support. To correct this, you’ll need to change your resolution 
setting: Press MENU, select Settings, then Setup, then  HDTV in the left side menu. Press SELECT on 
the  Resolution tab and mark or unmark the TV  Resolutions to  display the resolutions supported by your 
television.
RESOLUTION Key on Receiver Front Panel
Th
  is key is used to cycle all available resolutions on your DIRECTV HD Receiver. It does not cycle 
format settings. If video and audio are not appearing, it may be because the current resolution setting 
is not supported by your television. By pressing this key, you can check all available resolutions to see if 
that solves the problem. Th
  e lights next to the RESOLUTION key on the   front panel will light below 
the resolution to which the receiver is set; they will change with each key press.
Resolution made 
simple: Set 
the resolution 
to the highest 
number that your 
TV supports by 
pressing the 
RESOLUTION 
key.