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LG TV Displays NO SIGNAL Message

  • Video Issues
  • No Video
  • Troubleshooting
  • TVs
  • Last Updated 03/10/2014
LG TV Displays NO SIGNAL Message LG TV Displays No Signal Message

When a No Signal message appears on the TV, the TV cannot detect a signal from an external input. Determine which connected external device is not sending a signal. The main reason for signal disruption include cables not correctly connected to the corresponding device input/output ports or faulty hardware. Review the steps below based on the type of external device connected to the TV.

Note: Home Theater / Receiver.  When a home theater or receiver acts as a hub for all external devices connected to the TV and the No Signal message appears, verify the input/output connections between the TV and external devices to the home theater are correct.

HDMI to Cable/Satellite Box, Blu-ray Disk Player & Other Devices
HDMI to PC or Laptop
Component
A/V Composite
DVI to HDMI
Coaxial to Cable Box
Coaxial to Antenna


HDMI to Cable/Satellite Box, Blu-ray Disk Player & Other Devices

The TV has a several HDMI inputs, and must have the correct HDMI input selected to watch programming from your external device. The No Signal message indicates a problem with the cable connection or the external device.

1. Check if the TV is on the proper input. Press the Wheel or Enter button, the input that is selected will be displayed briefly on the TV screen.

2. Check if the cable is plugged in securely to both the external device and the TV. Perform the following steps if the No Signal message remains:
  1. Unplug the power to the external device for 30 seconds.
  2. Disconnect the HDMI cable from the TV and move it to an alternate port.
  3. Plug the device back in, and power the device back on.
  4. Change the TV to the new HDMI input to see if the issue is resolved.
Note: If you're troubleshooting a cable or satellite box, allow time for it to boot up after power is restored.

HDMI Connection

3. If the No Signal message remains, then access the menu system on the external device to set the resolution to 480p or higher, preferably 1080i. (HDMI does not allow the use of 480i).

4. If the TV continues to display the No Signal message, the cable box may be malfunctioning. To verify whether the cable box or the TV is the cause, disconnect the cable box from the TV and connect another external device such as a Blu-ray player, DVD player, or gaming console. If the No Signal message no longer appears and has been replaced with video from your device, the TV is working correctly. Contact your cable provider to check the cable box.

5. Once the cable box has been tested and working properly, if the No Signal message continues to appear on the TV, the TV may require service.

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HDMI to PC or Laptop

The TV has a several HDMI inputs, and must have the correct HDMI input selected to watch programming from your external device. The No Signal message indicates a problem with the cable connection or the external device.

1. Determine which TV HDMI input port is connected to your PC or laptop.

2. Press the SMART button Smart Button and select the Input Icon Input, then select the correct HDMI input.

3. Check that the laptop is set to output a resolution supported by the TV. A setting of 1920 x 1080 is recommended to provide the best image quality. If there is still no display, then proceed to the next step.

4. The original HDMI cable may be faulty. Use  another cable and test if the signal is now present. If not, then try a different external device.

5. If the No Signal message continues, try plugging the HDMI cable into a different port on the TV, then change the TV to the appropriate input. If all steps have failed, the TV may require service.

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Component

The component input on your TV supports analog HD video and two channel stereo audio. The No Signal message may indicate a problem with the cable connection or the external device.

1. Check that the TV is on the correct input (Component).

2. Check that the external device is powered on.

3. Make sure the Red, Green, and Blue cables are routed correctly and inserted securely on both devices.

Component Connection

4. If the No Signal message appears or there is no image, then reboot the external device.
  • Unplug the power to the external device for 30 seconds.
  • Plug the power back in to the external device.
  • Switch the device on.
5. If the No Signal message continues to appear, replace the component cable. If the substitute cable worked for another external device, but with the current connected device the signal continues to fail, then the problem may be with this device.

6. To verify whether the external device or the TV is not receiving the signal, disconnect the external device from the TV. Connect another external device such as a Blu-ray player, DVD player, or gaming console to the TV. If the No Signal message no longer appears with the new device, and a video signal appears on the TV, then the TV is working properly.

7. If all power, cables, and external device input/output connections have been tested and the TV continues to receive a No Signal message, then the TV may require service.

Note: Cable Connection Results
Correct Component ConnectionCorrect Cabling Red & Blue Cable Missing or UnsecuredRed & Blue cable missing

Red Cable Missing or UnsecuredRed Cable Missing Blue Cable Missing or UnsecuredBlue Cable Missing

Green Cable Missing or UnsecuredGreen Cable Missing

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A/V Composite

The AV or composite input on your TV allows the TV to display a standard definition image with two channel stereo sound.The No Signal message may indicate a problem with the cable connection or the external device.

1. Check that the TV is on the AV input.

2. Check that the external device is powered on and switched on.

3. Make sure the yellow, red and white cables are routed correctly and inserted securely on both devices.

AV / Composite Connection

4. If the No Signal message appears or there is no image, then reboot the external device.
  • Unplug the power to the external device for 30 seconds.
  • Plug the power back in to the external device.
  • Switch the device on.
5. If the No Signal message continues to appear, replace the composite cable. If the substitute cable worked for another external device, but with the current connected device the signal continues to fail, then the problem may be with this device.

6. To verify whether the external device or the TV is not receiving the signal, disconnect the external device from the TV. Connect another external device such as a Blu-ray player, DVD player, or gaming console to the TV. If the No Signal message no longer appears with the new device, and a video signal appears on the TV, then the TV is working properly.

7. If all power, cables, and external device input/output connections have been tested and the TV continues to receive a No Signal message, then the TV may require service.

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DVI to HDMI

The DVI to HDMI conversion cable allows a PC with only a DVI output, to display in High Definition on your TV. A separate 2 channel stereo audio cable is also required.

1. Determine which HDMI input port you have connected to your PC or laptop.

DVI - HDMI

2. Press the SMART button Smart Button, and select the Input Icon Input and select the HDMI input that the HDMI cable is connected to. Check that the Device Name for that input is set to PC.

Input Naming

3. Check that the laptop output resolution is set to one supported by the TV. A setting of 1920 x 1080 is recommended to provide the best image quality.

4. If there is still no image, check the cable to determine if it works on a computer monitor. This will test the HDMI DVI cable.

Note: If all steps have failed with a proven working HDMI/ DVI cable, the TV may require service.

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Coaxial to Cable Box

For the majority of cable/satellite set top boxes, the coaxial cable is standard definition (STD) only. Check your user manual for your cable box to confirm whether it is HD or STD.

1. Check that the correct input source is selected on the TV. If you are unsure, press the SMART button Smart Button and select the Input Icon Input then cycle to the TV input and press Wheel or Enter.

2. Check that the cable box is powered on, booted up and running.

3. Check that the cable connection between the cable box and the TV is secure.

NOTE: Do not over tighten a coax cable connection. This can cause damage to the coax jack of your TV.

4. The majority of cable boxes will output to analog Channel 3 or 4. Press the Channel Up/Down key on your TV remote. Wait until the channel changes to 3-0. The channel selected must be 3-0, not 3-1, 3-2, or 3-3. If the picture does not appear, press the Channel Up/Down key on the remote to try channel 4. Wait until the channel changes to 4-0. The channel selected must be 4-0, not 4-1, 4-2, or 4-3.

5. If no picture appears on the TV, when the channel is set to either 3 or 4, refer to the cable box instructions to determine the specified output channel.

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Coaxial to Antenna

A coaxial cable may come directly from an antenna or from a wall outlet as used by a Basic Cable system. (Basic Cable is the system supplied by a cable company, but does not use cable boxes. The whole house is supplied via a single cable; this is split off with Tee pieces to feed each room outlet.) The antenna may be of the external or internal type, and should be pointed at the transmitting station to receive a good signal. Local stations may be transmitting from different points of the compass, so you may not receive all of them, unless you rotate your antenna.

1. Check that the correct input source been selected on the TV. If you are unsure, press the SMART button Smart Button and select the Input Icon Input, then cycle to the TV input and press OK.

2. Check that the coaxial cable is connected securely to the TV.

NOTE: Do not over tighten a coax cable connection. This can cause damage to the coax jack of your TV.
 
3. Check if other TVs using the same cable provider are working normally? If the other TV's are not working, then contact your cable provider. If they are working, then perform a channel scan on this TV.
Channel Scan instructions.
  1. Press the SMART button Smart Button on the TV remote to access the Home/Smart Page on your LG TV.
  2. Select the Settings Settings Option, which is found on bottom row (usually 2nd from left icon).
  3. Select the Channel Channel Menu, then select Auto tuning and wait until scan is completed.
4. If the channel scan found at least one channel, then the TV is functioning correctly. However, your antenna may need to be relocated if it is an indoor type, or rotated if it is a fixed outdoor type. If no channels were found, then your TV may require service.

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