I originally posted this issue of the comcast remote not working with this westinghouse model TV back in 2010.
Since then, I still have the TV and am happy to report that after we upgraded our TV box and remote the new remote now works with this TV.
It took 10 years to figure this out. I suspect it was the upgrade to the remote combined with the new code that worked but if anyone has a TV and none of the codes work from comcast I would recommend they upgrade to the latest remote.
Experiment with this: