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I would suspect your cable box first. I would unplug the power cable from your cable box and wait 60 seconds. Plug it back in and try to watch cable tv. I would also make sure the coaxial cable going from the wall to your cable box is connected properly. I would also make sure the cable going from the cable box to the tv is connected properly. Test your tv and see if it works correctly when you watch cable. If this fixes the issue you are good to go.
If this makes no difference use a set of new cables if you have them.
If this does not work then call your cable company. They may have to replace your cable box.
if you are using coax cable to conn cable box to tv, be sure to use the analog ant conn on back of tv, and there is a switch on the back of the tv for selecting channel 3 or 4, for cable box use. be sure to turn tv to the same channel the switch is selected to, and always use the cable box to change channels/ programs, not the tv channel selector.
It is a possibility if you are using a cable tv service, without a converter box, that the cable company has limited the number of station you are able to receive. It seems to be their new ploy to get subscribers to get a box since the digital changeover. I also may be that the TV's tuner memory may have to be re-programmed. Go into the menu and go through the channel scan process and see if they return. If they don'y it may be a tuner issue. An easy fix is to get a cable box!
Hope this has been helpful
instead of putting the converter box on ch4 ,put it on ch3 same as the vcr . set the converter box channel for the channel to be recorded, program the vcr to channel 3 for the channel to be recored. set the time and date on the vcr progam.tv does not need to be on for the program to be recored but the converter box needs to be on.
i know this problem, happened to me with the comcast Motorola HD receiver box. The key is with the setting in the cable box.
Switch on the TV.
Set the channel to normal tuner channel 3 or HD input.
Turn off the cable HD box.
Press the Menu Button on the Cable box or the remote.
You should see a Menu.
Use the cursor keys to navigate
The default setup is also one of the option, Right click on your cursor keys acts like the computer keyboard enter key and applies the change.
The default setup is 16:9, the shacking would happen if you have set the picture type to "PAN SCAN". change it to either 16:9 or 4:3 Letter Box. The shacking should stop.
Hope it helps.