XfinityTV and Equipment

[nels31]

How do you set the output mode to 720?

[RicardoR]

For Cisco RNG200

(With Box Powered OFF, press directly on THE BOX)

VOLUME UP + DOWN at the same time You will see “HDSr” on Box Screen
To change Box resolution press arrows as follow:

Up: 480i

Left:720p                                        

Right: 1080i

Down:480p

Wait a few seconds after selection and word “SET” will appear on Box Screen

[rog286713]

I don't know how you know that box is an RNG 200 but for a motorola box, turn off the box, with it off press the menu button on the remote.  In that screen you can set resolution to 720p.

Requirements for 3d include

3d capable tv and cable box

HDMI cable

set resolution of the box to 720 p

Have 3d account codes added to your service.

[RicardoR]

RNG200 is the model, and is printed in front of the box

I can watch 3D in 1080i resolution when 3D mode is side-by-side

[rog286713]

The original OP did not say what box they had so I was wonderin how you knew what box they had.

[RicardoR]

In my area, Cisco RNG200 is the only Comcast 3D-HDMI-Box available.I just wrote a general recommendation for the model I have