Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Problem programming channels?

I've had 2 of these televisions in 4 days and neither one will program channels into it except for channels 5 and 6. I'm connected to Comcast analog in the Chicago area. Magnavox tech. support is stumped. I've run the channel scan at least 30 times to no avail. Does anybody know what the problem might be? Is there a way to change the cable mode between irc and hrc?