I just had the same problem on the new version of the cable box with the updated Comcast software. Very simple. Hit the Menu button (the one that says xfinity in red). Go to the last icon for settings. Go to Device Settings and you will see that Closed Captioning is the first choice. You toggle on/off.
But when I turn my STB off, my TV goes off, too. I didn't hook this all up, I'm just trying to get rid of the closed captions!
Apologies for this issue. I can see that you have a Motorola cable box but not sure entirely of the model number.
I can also see that there is an open ticket on your account that is being worked for this situation. Thanks for your patience.
You are able to turn the cable box OFF using the power button located on the front panel of the box while leaving the TV set ON.
Also, how is the TV connected to the cable box? HDMI? Component cables? Coaxial cables?
Steps to enable and disable CC on Comcast STBs:
Motorola HD Set-Top Boxes
Turn STB off and leave TV on
Press Menu on STB or remote control
Using the down arrow, navigate to Closed Captioning
Press the right arrow to select Enabled or Disabled
Also, you can try this:
To modify the Closed Captioning settings:
Access the TV Guide Main Menu (press Menu twice on the Comcast silver remote control)
Using the arrow keys, navigate to Setup and press OK/Select
Using the arrow keys, navigate to Closed Captioning Setup and press OK/Select
Using the remote control, modify the Closed Captioning and Background settings as needed and press OK/Select to confirm the settings
Additional settings such as Font size, Color, Service selection, etc. still require accessing through the set top box diagnostics menu (accessed by pressing the power key to turn the set top box off and then followed by pressing the menu key on the set top box).
Note: This feature is only available for HD and HD-DVR STBs. Standard Definition Boxes must continue to use the Closed Captioning feature built into their TV.
If the above doesn't work or you have a non-HD cable box, the closed captioning may be showing from your TV set (not the cable box). Locate your remote control for your TV set (not the Comcast remote)and check the TV's menu setting or closed captioning settings.
The software on my Motorola DCH3416 is ver: 78.53-A28p0-4.1005.r-8. I called Comcast and asked about A30 software. Was unable to get a satisfactory answer. Is this A30 software available nationwide or just in certain areas? Do I have to ask for it or is it an automatic upgrade?
On Motorola-based boxes updated to A30 software, you an now turn CC on and off from the main menu, and change the CC background between black and clear. More detailed settings still require the power-off/MENU method if you want to change fonts, color, etc...
I recently swapped out my old Comcast HD-DVR box (which was about five years old) with Comcast's latest HD-DVR box (as of December 2012). I hooked up my Sony Bravia TV to the HD-DVR box via the HDMI cable and the closed captioning button on my Sony remote wouldn't work. I unhooked the HDMI cable and hooked up the analog RCA video/audio cables to the component input on my television. Using this input, I could get the Sony remote to activate the closed captioning on the non-HD channels but not on the HD channels. Leaving the RCA cables in place, I re-hooked up the HDMI cable from the HD-DVR box to the HDMI input on the TV. If I select the HDMI input from the Sony remote, the closed captioning doesn't work on any channels. If I select the component input from the Sony remote, the closed captioning works on all channels. You have to have the HDMI cable connected from the box to your TV, you have to have the RCA video/audio cables (there are five RCA plugs, three for video and two for audio) hooked up from the box to the TV component input, and you have to select the component input and watch TV from that input if you want to use the closed captioning you're used to seeing. It sounds complicated but once you have it hooked up, it's just a matter of changing your video input when you want to see closed captioning. I'm Larry Gentry on facebook if you need help.