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This sounds like a common problem on these TVs (it's happened to both of my AOC TVs a couple times). Try a factory reset:
1. Press and hold "Menu" and "Channel+" on the TV. (do not use the remote) 2. Using the other hand, press the Power button. 3. A small screen should appear in the top left part of the screen. 4. Using the remote, select "Memory Recall" and Enter. 5. Power off and reboot the TV and Computer. 6. Run channel auto-scan to regain the picture.
go into programming mode and search for channels it will do this automatically to find all antennae and all cable channels if this is hooked up to a receiver box then only channel 3 will be found or used also most tvs are computerized these days and at times it will need to 'rebooted' unplug the power and wait 10 seconds and plug it in again this may have to be done whenever you are locked out from changing channels or using the volume controls
using the magnovox remote, reprogram the vcr's channels. set it up to use cable not air. when the vcr was unlugged it lost it's channel memory. don't buy new cables, you're getting a picture and sound so that means your rca cables are ok.
If you hooked up the satelite box to your tv Automaticly the Satelite box is the one who pick up the channels (from the satelite)
In this case your tv is acting as a monitor only. Try to connect your tv with HDMI cable or COMPONENT cable for best picture. Don't use RF antenna input to hook up your Satelite Box. Hope this Helps
in some cases certain manufacturers say in the instructions that when using s video with seperate audio, you cannot use the HDMI for the sound and sometimes visa versa, it's just the way the output is set up.
Remove the other sound cable you are using for pc or tv and just use HDMI to confirm that the sound is re-enabled on the HDMI
You got the right idea,use the ext.imput on you tv and use the vcr to change the channels,you can check the solder conections in the tuner ,ussually the ground gets loose after a while but if you are not too familiar with tv service and dont want put any money in this set use your vcr.If the quality of the picture is still good then is worth keeping it.Let Us know if you need more information.