I have a TV/VCR combo just given to me by a friend. The VCR works just perfect and same with volume and other features, but can't change TV channels. After repeated attempts to set channels, both auto or manually, it always goes back to either LINE or channel 67 when I attempt to change channels. Note: I have a cable connection and signal but no cable box. Also tried to set it to channel 3 or 4 on the set up menu but to no avail. Any suggestions?