I can't program my Comcast remote for my Olevia model 232 S12, I have used all the codes comcast suggested to no avail

The Comcast remote will unlikely have Olevia codes available since its design age is much older than the set's. In addition, it may never have them since Olevia is bankrupt and probably of little interest to Comcast. You might check Comcast's website since the most recent codes will be available there.

I have the same problem and have heard that if you have a comcast remote that takes 4 digit remote codes, it won't work.

You need a newer comcast remote that accepts 5 digit remote codes.

The easiest way to determine if you have a new or old remote is the color of the Ok/Select button. Newer remotes have a red OK/Select button. Older ones have a gray Ok/Select button. Comcast reps may be able to drop one off.

If not, I've heard Radio Shack carries cheap universal remotes that work w/ both Comcast DVRs and Olevia LCD TVs.

I used the RCA codes and 10019 worked for the digital adapter remote for Comcast.