I have a motorola DCH 3200 hooked up to a ONKYO receiver and a Phillips 47PFL77403D/27 LCD t.v. using HDMI, That has the same issue, cable box remote control simply will not work with the T.V. on,sometimes The cable box remote will work if I turn on the T.V.'s on screen menu. Drives me crazy and I have already replaced the Cable box and remote control,I have tried aftermarket remotes with no improvement in symptoms. Already had a comcast tech out here who was of no help,any input on this issue would be apprieciated.I am using comcast,would going over to Direct t.v.or some other Satellite provider that uses a different H.D. box help?? The t.v. has the latest firmware updates in it. Comcast claims that they have never heard of this problem before.