Here is a email i got back from LG in response to asking them why Verizon FIOS is not compatible with their TV's/CableCARD slot:
We are delighted to hear from you as our Valued Customer. We regret the trouble you have experienced with this television and cable card. The major reason for incompatibility is the format of the FIOS signal. It is not sent out in the standard cable format, as the other companies are. The FIOS system is originally designed to have your cable box convert the signal from a Fiber Optic line to a wire that the television can use, such as the standard Coaxial Cable. If you have other questions or concerns, please do not hesitate to contact us again either via email, or by calling our customer service division at 800-243-0000 at your convenience. Mr. Neil Electronic Correspondence Executive (ECE) LG Electronics USA 800-243-0000
Anybody think this could be the reason?