No channels bought tv with no remote or manual . hooked up with cable and worked fine . accidently hit button to return to factory settings . now have no tv and it says no signal and no channels listed .

you will need the remote to do a channel search or manually reprogram the tuner to tune in ch3
A good place to fine cheep factory remotes is on e bay. enter your model and make, only buy factory remotes not universal .
Factory remotes can do things a universal one cannot.

I have one of this tv model too.Just used a RCA component cables like Y,R,W hook one side to the tv Video IN INPUT holes and the VCR the other end of the cable to VCR Video OUT INPUT holes.Now just pushes a channel manual button up or down a couples for the tv go into VIDEO Mode.Play the dvd player it will work.Or try Remotes.com to buy a tv original remote.Return the universal remote.

You have lost your original remote and got into this by pressing info select and the option 7 UART Download. Happened to my 95 year old aunt in assisted living. You will need the original remote and simply hit (EXIT) or another LG branded remote that has the (ROUND RETURN BUTTON) on the left. Once you accidently get in to this, I have not found a universal Zenith remote that can get you out even though Channel up/down and basic funtions work.Bud retired Bud's TV Service.

first step- go true de factory resset.
setup again that tv....

Followed the manual to return to the Default settings, using the remote "in the blind" pressing the arrow and Enter buttons, hoping I hit the right menu button. I did. Case solved. Thanks

Try pressing the "Input" button the front of the set. That should allow you to change between the different inputs. The return button usually returns you to the previous channel you were watching - don't think it works for the input though. Also, depending on the model of the set you have, try downloading the PDF user or owners manual - it will tell you how to use the remote.

TV SETTING
1. Press the MENU button.
2. Use or button to select the TV setting menu, then press or button.
3. Use or button to select the Channel no. setting and use the or button
to change from AIR (over-the-air broadcasts) to CABLE (cable/satellite broadcasts).
4. Use or button to select the Tuning mode and use the or button.
5. Use or button to select the Auto tune and press or button to
confirm the selection. The unit will immediately search through all possible TV
channels and store those channels with signals in memory. After this is complete,
the unit will switch to the first channel found.
6. To exit the MAIN MENU and return to the normal screen, press the EXIT button.
Note : In DVD mode, this option is not available.
Remarks:
1. Channel no. : 2-69 channel for Air mode, 1-125 channel for Cable mode.
2. Tuning mode : Air or Cable mode are available.
3. Auto tune : Searches for usable stations and stores them in memory.
4. Skip : ON - Skip weak channels. OFF - No channel skip.
5. Fine tune : The frequency changes to allow fine tuning.
6. AFC : Auto frequency control.
7. MTS : Select the Mono sound/Stereo sound/Secondary Audio Program (SAP).
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TV SETUP
MTS (Multi-channel Television Sound) SETTING
This feature allows reception of sound other than the main audio for the program.
1. Press the MENU button.
2. Use or button to select the TV setting menu, then press or button.
3. Use or button to select MTS menu, and press or button to select the
options (Mono, Stereo, SAP)
4. To exit the MAIN MENU and return to the normal screen, press the EXIT button
on remote control.
Note:
• MTS only operates while in TV mode.
• The SAP (Secondary Audio Programs) feature allows a TV station to broadcast
other information, which could be audio in another language.
RESTORE SETTING
If you reset the TV to the factory settings, all your present settings on picture &
sound will be erased and replaced by the factory’s default settings. However, picture
setting in PC mode and parental setting will not be erased.

Are you using a set-top converter box?

Be sure that you are on the "Tuner" input, and that if you are using a converter box, that you have the set tuned to the single channel that the box puts out. (In the US, that's either 3 or 4.)...accordianman

I was having same problem, and think I got lucky and found fix.

Try unplugging the TV and waiting 30 seconds, then plug back in.

You will likely get blue screen with "No Signal".

Go to Menu, then scroll down to "Setup". Select "Factory Reset" then hit "Yes."

This did it for me. Wish you all luck.