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Standard Definition Channel Converts to HD Resolution - Troubleshooting

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If you have a Motorola DCX3400M TV Box and certain models of Phillips HD televisions you might experience an HDMI re-synch issue when powering on both the TV Box and the TV.  An HDMI re-sync occurs when you tune to a standard definition channel, and the channel automatically converts to HD resolution (for example, 16:9 aspect ratio).

Note: This issue only applies if you have the following On-Screen Guide:
This is an example of the a31 On-Screen Gude. The TV listings are displayed.

Impact

If you have a Motorola DCX3400M TV Box and certain models of Phillips HD televisions you may experience an HDMI re-synch issue when powering on both the TV and the TV Box.
 

Steps to Resolve Issue

You can avoid re-synching only by turning the TV off/on (i.e., not using the All On button on your remote) or by replacing your HDMI cable with component cables.

If you continue to experience issues, please visit our Discussion Forum Community from any Internet-connected device. Chances are, your question has already been asked and answered. If not, post your question and get answers from Comcast employees and/or customers like you.

Or, please Contact Us using the method that is most convenient for you - chat with us online or call us to speak with a Comcast representative.
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Find this article at:

https://www.xfinity.com/support/cable-tv/a31-guide-hdmi-resynch-issues/

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