have you tried the magnavox codes? Both those brands are notorious for not playing well with comcast remotes. Have you tried to go to ebay and see if anyone is maybe selling that remote? The best your comast remote will do with that player is turn it on and off anyway.
I believe your Philips MX 1055D/MX 1015D is considered a "HTIB" (home theater in a box), not a DVD player. The Philips HTIB code for a Comcast remote with a grey OK button is 1914. Try it and let us know.
I'm having an extremely hard time setting my DVD player, AUX setting, up to the comcast remote (universal w/ grey OK button). I'm programming it because I dropped the old remote, which had everything programmed by the comcast helper, and recieved an extra one from a friend.
I was able to set up the TV without a single problem, but I can't get the DVD player. The DVD player is a Philips DVD/CD Player-Digital A/V Surround Receiver (it also says Mx-1015D and Mx-1055D. I assume that's the model (??).
I HAVE tried every code given in the manuel for Philips players and none of them have proved fruitful. I have also tried using the 9-9-1 search code, but that also has had no results;however, I may be doing the seach code incorrectly.