Why tv says no channels found

Verify that antenna connector conductors are properly isolated and properly connected with TV. It seems the antenna connector cable is either short or opened.

It depends where you are. Digital has replaced analog signals. If you don't receive channels, ask a friend or neighbours on the situation with their TV. If their hd TV are working properly, then you may have not tuned the TV properly. Have you chacked the Antenna cable? Yes? Then tune it with care and watch what happens. Normally, the TV will show if a signal has been detected. If you have no signal, you need a technician because there are more than one reason this is happening, probably you haven't connected the Antenna cable. Who knows. Again, check the antenna cable, is it lose or wrongly inserted? If you have a small digital TV, connect the antenna to that TV and see if the channels are working. If not, it's probably the cable from the wall socket to the TV (change the cable) or the Antenna cable had been a meal for a rodent on the roof. As I said, who knows?

Confusing question! The CM-7001 is meant to be used for displays or monitors that have no means of connecting an antenna and don't have a built-in tuner. HDMI to HDMI would be the correct way and make sure you select the proper HDMI port. Or use the other video and audio cable connections.

Here is a few suggestions:

1) Make sure the tv's vide mode is in "TV" or "ANT" or "Antenna" some times even referred as "Off Air"
2) In the TV's settings make sure a "Channel Scan" has been performed to tell the TV which channels are available in your area. If this is not done you won't be able to select any channels. Also make sure that the antenna is of the right impedance (i.e. 52ohms) check your manual and see what your TV accepts.
3) Make sure that you are using coxial cable connection and not RCA or HDMI connections as these connections are not designed for an over the air antenna.

If you are in Nothern Ireland you will need a UHF antenna, and Republic Ireland you will need VHF and UHF antenna to recieve off the air signals.
Connect the antenna to the back of the TV. Turn the TV on, select "menu" button on your remote and slect TV from TV/Cable menu press enter, go to main menu and select channel set up menu and select auto channel button and when finished press menu button, check your user manual for details.

It is important for the TV to know what type of
signal-Cable TV (CATV) or a normal antenna
you are using. Choose your signal (Antenna or
Cable):
Press MENU to see the main menu.
Press CH+ or CH- to highlight Setup.
Press OK to enter the Setup submenu.
TV/CATV is highlighted. Press VOL+ or
VOL- to select TV or CATV.
Choose CATV if you have Cable TV
service. (See page 4 for connection
details.) If you do not have Cable TV
service and you connected an antenna
to the TV, choose TV. (See page 5 for
connection details.)
Press MENU repeatedly to exit the
menu or the menu will automatically
disappear within a few seconds if no
buttons are pressed on the remote
control.

And here is the manual if you need .

http://tv.rca.com/RCATV/Assets/pdfs/27F520T_1641312E_IB_e-06.pdf

Good luck and please rate

Use an Antenna that Provides Good Reception of All Channels

• Most existing antennas used by consumers will provide good reception of DTV signals. (Before making any changes, try your existing antenna first to see of it allows you to receive all the stations you normally watch.)
  
• For watching DTV signals, you will need an antenna that provides good reception of both VHF signals (channels 2-13) and UHF signals (channels 14-51) to reliably receive all of the digital signals broadcast in your area.
  
• Many antennas are designed only for reception of either VHF or UHF signals (but not both). For example, the commonly used “rabbit ears” indoor antenna is only suitable for receiving VHF signals. To receive UHF signals, an indoor antenna should also include a wire loop or other feature for reception in that band.
  
• The reception capabilities of TV antennas also vary considerably, so be sure to talk to retail consultants and look at information on the packaging and/or the Internet to make sure that any new antenna you may choose provides good reception of both VHF and UHF channels. In addition, if you use an indoor antenna and receive signals on VHF channels, you may need to use an antenna with amplification.
  
• Many antennas currently being sold as “HDTV Antennas,” perform best at receiving UHF signals; some of these models state that they provide reception of signals on channels 7-13 but actually perform less well receiving those channels. If you obtain one of these antennas, be sure it provides good reception of all the VHF channels as well as the UHF channels.
  
• To check for the DTV signals that are available at your location, use the DTV Reception Maps available at www.fcc.gov/mb/engineering/maps.
  

Check Your Connections

• Check that your digital-to-analog converter box or digital television is connected properly. Make sure your antenna is connected to the antenna input of your digital-to-analog converter box or digital television. If using a digital-to-analog converter box, also ensure that the antenna output of your converter box is connected to the antenna input of your analog TV. Refer to the owner’s manuals of your components if you are unsure of the proper connections.
  
• Ensure that your components are plugged in and have their power turned on.
  
• If you have a digital-to-analog converter box, tune your analog TV to channel 3. You should see a set-up menu or picture displayed on your TV screen. If you do not see a set-up menu or picture, tune your TV to channel 4. If you still do not see a set-up menu or picture, recheck your connections.
  

Perform a Channel Scan

• Digital-to-analog converter boxes and digital televisions have a button, usually on the remote control, that is labeled “set-up” or “menu” or some similar term. Press that button to access the set-up menu. Using the directional arrow buttons on your remote, scroll to the option that allows you to perform a “channel scan.” The channel scan will automatically search for digital broadcast channels that are available in your area. Consult the owner’s manual of your digital-to-analog converter box or digital television for detailed instructions on how to perform a channel scan for your device.
  
• Once the channel scan is complete, you will be able to tune to the digital channels received by your antenna. You should perform a channel scan periodically to check whether additional digital channels have become available.
  

Adjust Your Antenna

• Small adjustments to your antenna can make a big difference in the number of digital channels you can receive. If you have an indoor antenna, try elevating it and moving it closer to an exterior wall of your home. After adjusting your antenna, perform another channel scan to see if your reception is improved.
  
• While adjusting your antenna, it may be helpful to access the “signal strength meter” on your digital-to-analog converter box or digital television to determine whether your adjustments are improving the signals’ strength. The signal strength meter is usually accessed through the menu feature on your remote control. Refer to the owner’s manual of your device for detailed instructions on how to access its signal strength meter. Remember to do another channel scan after you have adjusted your antenna.
  
• Television stations broadcasting in digital use both the VHF band (channels 2-13) and UHF band (channels 14-51). Many indoor antennas use “rabbit ears” for the VHF band and a “loop” or “bow-tie” antenna for the UHF band. Make sure you are using an antenna that covers both the VHF and UHF bands and have connected it properly.
  

If You are Still Having Difficulty:

• Until June 12, 2009, some stations will be operating at reduced power levels. If you are not receiving certain digital TV stations, this does not necessarily mean there is a problem with your antenna or digital-to-analog converter box or digital television. Check with the TV station to find out whether they are planning changes that will improve reception.
  
• When an analog TV signal is weak or receives interference, static, snow, and distortion will often appear on the screen. Digital broadcasting will provide a clear picture; however, if the signal falls below a certain minimum strength, the picture can disappear. This “cliff effect” means that if you watch analog TV stations that have static and distortion, you may have to adjust or upgrade your antenna system.
  
• Simple indoor antennas provide minimal performance that may not be suitable for your location. If you are unable to obtain satisfactory DTV reception with your current indoor antenna, you may wish to obtain an indoor antenna that includes features for better reception of UHF signals, as well as VHF, and/or an amplifier to boost the received signal (often referred to as an active indoor antenna).
  
• Generally, an outdoor antenna will get better reception than an indoor antenna. However, the performance of outdoor antennas can degrade over time due to exposure to the weather. If you are having problems, check for loose or corroded wiring, broken antenna elements and that the antenna is pointed in the right direction.
  
• Try to keep the length of wire between your antenna and digital-to-analog converter box or digital television as short as possible for best reception.
  
• “Splitters” that are used to connect a single antenna to multiple digital-to-analog converter boxes or digital televisions reduce the amount of signal available to each device. If you are having problems, check whether reception is improved without the splitter. In some cases an “active” splitter that includes an amplifier can solve the problem.
  
• If you are near a station’s broadcast tower, reception of that station, as well as other stations, can be impeded by strong signal “overload.” Consider using an “attenuator” or removing amplifiers to improve your reception.
  
• If you decide to replace or upgrade your indoor or outdoor antenna, many types are available from electronics retail stores at a variety of prices. Websites such as www.antennaweb.org provide information on the locations of broadcast towers and the types of outdoor antennas appropriate for the stations you wish to receive. If you need assistance with upgrading your antenna system, check with a local antenna retailer or antenna installer.
  
• To check for the DTV signals that are available at your location, use the DTV Reception Maps available at www.fcc.gov/mb/engineering/maps.
  

Hope it may helps:

Regards:
VOTIT

You may need a new antenna.  Go to www.antenna.com for info and help.

I carried my Westinghouse TV to the basement. Unplugged the antenna from the digital converter box and connected it to my digital TV. I then re-scanned for channels and found channel 9. After carrying the Westinghouse TV back upstairs, I connected the original set-up and tuned to channel 9 which was now showing on the screen as no signal. From that point I moved my VHF dipoles until I had located the correct position for reception. A little labor intensive, but I was fortunate to have another antenna that was receiving channel 9.

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.