We have an old Quasar tv/vcr attached to a rooftop antenna, and our ability to receive channels comes and goes.
Somehow channel 5 got eliminated, via the remote I think.
In trying to get it back, using the remote, I went into the menu, to Channel, to Autoset...
and when I was done, all we saw was our PBS channel. ONE channel.
How do you UNDO autoset?
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If you let it autoprogram and all you get is channel 103. Move the TV back to the old connection and see if it autoprograms all the channels there. If that works ok then you have a problem with the cabe line that only has channel 103.
Initially, the only reason you would need/use a modulator is when the DVD/VCR has no RF OUT and the Quasar TV has no Audio/Video IN. If this were the case, then connections would be:
yellow Video Out of DVD/VCD to yellow Video IN of modulator;
red/white Audio Out of DVD/VCR to red/white Audio In of modulator;
modulator RF Out to RF/ANT/CABLE IN of the Quasar;
TV has to be set to either Channel 3 or 4;
if Modulator has no RF OUT but instead has a small antenna, still the TV has to be set to either Channel 3 or 4.
If however, the DVD/VCR has an RF OUT, then a coaxial patch cord from this could be connected to the RF/ANT/CABLE IN of the Quasar. The TV has to be set to either Channel 3 or 4. There would be no need for the modulator.
Vizio representative suggested connecting antenna directly to TV and not through the VCR. In doing this, we lose the ability to record on the VCR but we record elsewhere and watch downstairs. The problem is solved on losing channels. I must add that we watch and record on a Sharp digital TV upstairs and do not lose channels. I don't know why the VCR had this effect on this Vizio TV.
Sounds like you need to go to the main menu and run the automatic channel selector again. It will take note note of which channels are not in use and then skip over them when you use the channel advance. Use your remote to get into the main menu and select the "TV" submenu. Then run the auto channel select. After that's done, you can also manually choose to skip channels you don't like. I believe the channel numbers appear in green if they're to be included, and yellow if they're to be skipped. Even if a channel is skipped, you should be able to get to it anytime by punching in the number on your remote.
I am not conversant with VCRs sold in the United states, but - a VCR is a VCR is a VCR.
So, can i suggest an alternate solution to your problem?
Why not use the AV out sockets of your VCR and hook them to the AV IN sockets of your TV? In this manner, you you also get a better image. And of course, you feed In the signal source (Antenna, cable Box, etc) directly to the TV, and use your remote to switch to AV mode whenever you desire to watch movies or Tape.
Your TV is set for standard broadcast.
You need to go to the set up menu and change from antenna/normal to cable mode.
In standard broadcast mode you receive off the air programs 2-13 vhf and 14-83 uhf.
In the cable you receive 2-13 and cable channels 14 -125 if the set is not too old.
When cable channels first came out some sets would just cover 14- 36 or 14- 47 or 14-66 etc.
The newer sets cover the now standard cable channels 14-125. Hope this helps you
Check first the antenna using another TV. If there is no other TV available, check using an ohmeter. If you are 100% sure tha the antenna is ok then the antenna connector on your Tv is not making a good connection to the antenna plug.
I find that sometimes you have to turn the antenna a little to receive more channels. Do you have a good booster? I gained an extra twenty to thirty channels by installing a good booster to my antenna.