Your TV has detected that you disconnected the cable and has switched modes to antenna input. Despite the likelihood that you do not have a UHF antenna, your TV will pick up usually 1 to 5 stations in the UHF band. It would pay to pick up a cheap universal remote from the Dollar Store if there is one in your area and they still have the remotes available for a dollar.
SOURCE: channel selection
What you need to do is take the remote, go into the menu, find channel scan and do a channel scan to find all the available stations available on this system. Make sure the TV set is in the cable mode and not antenna mode or you wont get any stations above channel 13.
SOURCE: cannot program cable to tv
if your are using a cable box,all of your channels will be control only on the cable box.so, what you are going to do is use the remote control of the cable box.
SOURCE: Tivo won't change my TV Channels anymore with direct cable
I re-did the guided setup in the Tivo under Messages & Settings/Restart-Reset System/Restart menu section in Tivo. Once I did that, it cleared this issue, even though I didn't have to change any of my settings thru this guided setup. I tried a reset alone first, but that did not fix it. Only this fixed it. We had lost both power and cable during a recent tree fall in a storm, and when both were restored, this problem started. I have a cable coax directly in the back of the TV (no cable box/IR etc) and the system is on a home wireless network. I actually have 2 identical Tivo's in the house set up the same way but only one had this problem. The other worked no different after the outage.
SOURCE: RCA Colortrak 2000 remote control
I called RCA's 800 number on the back of the owner manual--got a response that said to replace the unit since only the up-down channel changer buttons were not working. Using another remote (universal) now--cost only $5.
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