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Check your TV settings and be sure to set the tuning mode to cable (sometimes it says CATV). You will find it's set to "air" now. When set for off-the-air tuning, cable channels 2 through 13 work fine, but above that you get nothing. After you set your tuning mode to cable, rescan channels and ou should have everything.
Try bringing up the menu by holding both volume buttons down at the same time (or use menu button on remote if you have it). Go into CH SET using the channel and volume buttons on the front of set (or use the SET + and - and the ENTER buttons on remote). Go to the TV CATV line and move the arrow to CATV. Let menu time out. This will put tv into cable mode. Hope this helps.
Your tuner settings must be set on broadcast instead of cable.
Below channel 13, they use the same frequencies so it doesn't matter.
Find the tuner settings page in the menus and change the
Probably, at first you searched the programs in automatic way. And there were only 20 channels at that time. So, you only have 20 channels. You should try to search channel 21, 22, 23, etc, manually. If you can't set 21 on your program, then your tv set has only 20 programs.
You did not mention which set you have, so look for a small switch (usually on the back of the set) or go into the menu and set the TV to the "broadcast" or "tv" mode. If the set is in the "cable" mode, you will not get any UHF channels above 13.
If you get channels 2 to 13 nice and clear but the rest are snowy, it means that the TV is set to the broadcast channels, which means that for the channels above 13 it is tuning in the old-fashioned UHF channels. If the TV is set to the cable mode then it tunes in cable channels above 13. To do this, enter the menu and navigate to the tuner settings, set the tuner to standard cable and then do the autoprogram, and the tuner's memory will be set for your cable system.