I just switched from Xfinity to Fios in march we get every channel in HD except 576 and 590 which is NBC sports channels that we watch all the time we have had our splitters and coax all checked and everything is good we have run all the tests and everything is good could it possibly be the set top box that was sent because it is only 2 channels that tile when we try to watch in HD theses are Philadelphia sports channels and we want to watch them in HD