Problem happened immediately after comcast disconnectd service-30 minutes tv was turned back on & didn't work.
Briefly...direct tv installed their dish & we switched service...comcast came out apprx 1 week latr to disconnect.tv workd 30 minutes before they arrived...was turned back on 30 minutes later & didn't.Strange but may just be one of those things
Bring up the menu screen the tv and auto program the channels this lock out all un wanted and only allow the rf tuner input channel from the box if your using rf cable hook up,if not un plug the unit for 1 min. and try it again.
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"AV- TV" where you plug your video cable in, there will often be a name like video-1 ,2or3. If you push the AV (audio video) button on your remote you will select channel video-1 if you press another one or two times toy will get channel video- 2and 3.
Use an RCA audio/video cable for this set up (Yellow/Red/White).
Connect from the Video out (Yellow) connection on the back of the cable box to the Video in on the back of the DVR.
Connect the audio (Red/White) cables from audio out connection on the back of the cable box to the "Audio in" on the back of the DVR.
This should still get you a decent picture but not a true HD picture for your recordings.
When you set the timer to record set it to record either E1 or E2 depending on which input you connected the cable box to and ensure that the cable box is tuned to the channel you wish to record.
*** NOTE: If you keep the HDMI cable connected as you have for the cable box and watch normal TV through the HDMI input on the TV you will get HD programming for your general viewing but still have the option to record with the DVR at a lower quality. ***
Talked to a Westinghouse tech and told to unplug for about 3-5 minutes, then re-plug. It's like having to re-boot your computer when it goes down or starts acting wacky. It worked, I got picture. Says it could happen again, maybe 1-2 times a year is o.k., if it starts to happen every few weeks, then it's something more.
I had the exact same problem on a brand new Insignia 26 " LCD with DVD. Comcast tech was able to fix it by changing the Comcast box diagnostics. Here is what he did. Using the Comcast remote with the TV on - press power, cable, menu in that order. A comcast diagnostic srceen will appear. Select Additional HDMI options, then audio options. Change the audio options to L-PCM. Press power again to exit the diagnostics. That will fix it and you get to use the HDMI cable.
Its possible that you changed the channel or the input line your TV gets the cable signal from. unless you caused more of a problem while trying to fix it, I would suggest you to go through the TV(not cable) channels to see if you can find the one that gives cable picture, or to go through the different input settings(TV/AV on older TV's, and 1, 2, 3 etc on newer ones). one general icon for the later is an arrow going into a circle. I think its the "select" button on your TV remote.