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Make sure the batteries are fresh in the remote control ( I am assuming you are using a remote control to access the on screen display) If you have a universal remote and replaced the batteries you most likely will have to enter the code for the specific TV that you have.
It sounds like a stuck button or switch. What happens when you hit the channel DOWN, does it still keep scrolling down?
Is this with or without the remote?
Have you tried it with the remote and or the TV?
Let me know whether you are changing the channels with the remote or the buttons on the tv and I can try to give you a couple more suggestions. Mac =)
If you mean that you get a black box, with a little of the picture visible around the edges, then your closed captions are on and set to TEXT. This puts a black box on the screen about 10 seconds after changing the channel. Go into the menu and turn off the closed captions and the picture will be back to normal.
I believe you are getting mixed up between channels and programs.
Normally program 00 is used for VHS as it has slightly different parameters for colour and brightness.
If the TV has about 39 or more programs which can be programmed in from the on screen menu, try using program 20 for the video and 30 for the cable. For this to work you must do the on screen frequency scanning from channels 22 to 69 (UK) and select VCR, CATV, VHF, UHF, etc.
I have used program 00 and 20 for two VHS recorders, working on channel 33 and 35 for example, but you must tune them to 33 and 35 on the `Tune' screwdriver hole by the aerial input sockets of the recorders.
I expect if your cable unit plugs into your aerial socket of the TV that it has an adjustment for what channel it is on.
The TV on screen menu may be different in some countries, so it would help if I knew where you are.