There is another method for locating the codes for the device you wish to control. Although I do not know the specific remote model you have it should work. First though try any of the codes listed here that you have not already tried.
0002, 0179, 0184, 0209, 0236, 0463, 0479, 1479
On a majority of the Comcast remotes you have to follow special instructions for setting up combo devices.
For your TV/DVD.
- Turn the device on and insert a DVD
- On the remote press the DVD button once, then press and hold the Setup button until it blinks twice.
- If you didn't insert the DVD into the player the first time you tried your codes, retry those as well. The most common code for your device is 0236
- If you entered the code in correctly the DVD button should blink twice if not try it again.
You may also need to enter a separate code for controlling the TV for volume control.
If you still have not found a code that works then use this method to search the stored memory for codes.
- Turn on the device.
- On the remote press the corresponding Device key and it should blink once.
- Press and hold the Setup key until the Device key blinks twice.
- Now enter 991 on the key pad and the Device key should blink twice.
- Aim the remote at the Device and press the Power button once.
- Now press and release the Channel + button continuously until the device turns off.
- Press the Power button and the devise should turn back on.
- If the device does not turn back on then press the Channel - until it does.
- To lock the code press the Setup button.
Again since I am unsure of which model remote you have there is a slight variation to this with other models.
Instead of pressing the Channel+ to scroll through the codes you need to alternate between the Power button and TV button.
If you still are no closer to relaxing while watching a DVD. You may want to consider programing the TV/DVD as separate devices.
All this seems like a real pain so good luck.
I hope this helps, but if not respond with the remote model# and maybe I can do more with that.