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LG TV HDMI Won’t Work (Detect/Connect/Disconnecting/Not Supported)

HDMI is a critical component of any entertainment setup since it is the industry-standard connection system for televisions and game consoles. However, LG televisions occasionally have difficulty detecting the HDMI link from specific devices.

When the HDMI port on your LG TV does not function or detect a signal, it is most likely due to a motherboard malfunction. This issue is resolved by purchasing a replacement that supports HDMI functions. Alternatively, you may attempt to restore the television’s capabilities by restarting it.

TV output ports

This article will address some possible explanations for why your HDMI line is not being recognized. Additionally, I will include guidance for repairing your device at home.

LG TV HDMI Won’t Work

TV output ports

Suppose your LG television is having trouble detecting the HDMI signal. In that case, your system may be incompatible with the television.

First, attach another gadget to your television to determine whether the issue is with the connecting device or the television itself. If a display appears, the previous device is unable to communicate with your television.

However, suppose this is a recent development with a system you use frequently. In that case, you may wish to attempt the following troubleshooting methods to allow detection of the HDMI display. Follow the steps below:

  1. Connect the HDMI cable to a separate port on the television.
  2. Replace the HDMI cable with another one. Lines are susceptible to shorting out or degrading over time.
  3. Inspect the pins on your linking device for bends.
  4. Check for damage to the HDMI port.

If you see external damages, they are likely the source of the problem. Consider consulting a technician to fix cable pins and receivers that have flaws.

LG TV Doesn’t Connect to HDMI

TV HDMI and USB ports

When the HDMI ports on your LG TV stop working entirely, it’s possible that the motherboard has shorted out. Numerous consumers have discovered that simply replacing the motherboard resolved their problem.

Before removing the board, locate an OEM part from an LG supplier that corresponds to your TV. Afterward, to replace the motherboard in your LG unit, follow these steps:

  1. Remove the screws that secure the back panel of the television. If no screws are found, pry the covering off with a flat-head tool.
  2. Unplug all cables and connectors from the mainboard.
  3. Unfasten all screws that secure the board to the television wall.
  4. Slide the replacement board into position.
  5. Screw the new board to the panel.
  6. Reconnect the required cables.
  7. Replace the back panel.

LG TV Doesn’t Detect/Show HDMI

HDMI ports with cable

Similar to a connection issue, if your LG tv does not detect or show the HDMI signal, the ports on your motherboard may have malfunctioned. Some owners may prefer not to contact a technician or purchase a replacement. In that case, there is one troubleshooting method that some users have had great success with.

Copyright protected content owner: and was initially posted on May 3, 2021.

To promote an HDMI connection, some suggest that you reflow your motherboard. You should keep in mind that this method can be risky; therefore, you should keep yourself protected during the process with safety gear.

To heat your motherboard to restore its functions, follow the steps below:

  1. Arrange the television flat on its screen.
  2. Take off the back cover.
  3. Detach the TV stand.
  4. Take out the motherboard.
  5. Preheat your oven for 15 minutes at 385° F (196° C).
  6. Place the motherboard atop a porcelain mug and into the oven.
  7. Allow precisely ten minutes for baking.
  8. Wait approximately 25 minutes for cooling.
  9. Replace the motherboard.

The reason this process works is due to the melting point of the elements in your system. Tiny cracks in your motherboard’s connections will form after years of use, resulting in HDMI failure. Fortunately, heating the board helps the solder to melt and the cracks to be filled.

LG TV Doesn’t Recognize HDMI Input

HDMI cable

If your LG TV is not recognizing HDMI input, it could be due to several reasons. One of the most common causes is a loose or damaged HDMI cable. Check if the HDMI cable is properly connected and if there are any signs of damage or wear on the cable.

Another possible reason could be a faulty HDMI port on the TV. Check if the HDMI port is functioning properly and try connecting the HDMI cable to a different port on the TV.

Copyright article owner is for this article. This post was first published on May 3, 2021.

Additionally, outdated firmware, issues with the HDMI device, or HDCP handshake issues can also cause the TV to not recognize HDMI input.

To fix the issue, try replacing the HDMI cable if it is loose or damaged, installing any available firmware updates for the TV, power cycling the TV and HDMI device, or resetting the TV to its factory settings.

If the issue persists, try connecting the HDMI device to a different TV or monitor to see if the issue is with the device. You can also contact LG customer support for further assistance.

LG TV Keeps Disconnecting From HDMI

TV output ports

To establish an HDMI link, both devices must be registered to communicate through the HDCP standard. If the link repeatedly disconnects, it means that one or more of the attached devices does not accept the HDCP encryption encoded in the HDMI signal.

Consider deactivating the HDCP setting on your connecting machine to resolve this.

Alternatively, you can disable your LG TV’s “deep color” function. According to some users, making this change resolves their disconnecting problem. To disable “deep color,” follow the steps below, depending on your model:

  1. Navigate to your television’s settings menu.
  2. Scroll to the bottom and choose “All settings.”
  3. Select the “Picture” menu item.
  4. Navigate to the additional menu settings section.
  5. Select “HDMI Ultra High Definition Deep Color.”
  6. Move to the HDMI port you are connected to.
  7. To switch off the mode, press the appropriate button on your remote.

LG TV Not Accepting HDMI Input

HDMI port

If your LG television does not accept HDMI inputs, perhaps the attached device is not sending output through its HDMI port. You can resolve the problem by changing the linked device’s video output format.

On the monitor of the connected device, the selected output may be shown. If not, search your video output device’s manual or configuration menu to see if the output is set to HDMI. If this is the case, the problem might be with the equipment used to connect to the TV.

Try Disconnecting the Amplifier Used on Your HDMI Cable

If you are using an amplifier in conjunction with your HDMI link, this may be why the system is not connecting. Consider consulting the manual for your AV amplifier to ensure that the connections are correctly set. Additionally, verify that the input on your amplifier reflects the input on your television.

If the settings are inappropriate, configuring the amplifier should allow for the acceptance of the HDMI connection.

Alternatively, you can omit the amplifier entirely and attach the video interface directly to the TV’s HDMI input. The problem may be that the amplifier is defective. Particularly if you were linking an analog connection to the A/V receiver, the receiver would be unable to translate the signal to HDMI for transmission to the TV.

LG TV HDMI Not Supported

HDMI cable

If an HDMI port on your LG TV shows an unsupported message while it is in service, this issue could be port-specific. Test the additional HDMI ports on your TV, if available, before removing any metal pieces. If all ports are malfunctioning, there is a problem with your television’s mainboard.

In that case, follow the steps outlined previously to replace your motherboard. However, suppose there is only one unsupported port. In that case, you can get around this problem by connecting your device through the remaining HDMI slots.

Additionally, you may see this error message when linking a machine with a resolution different from that of your television. The TV will support the connection after you change the resolution of the connecting unit.

LG TV No Signal From HDMI

HDMI cable

In some cases, you may be able to remove a “No Signal” message by performing a hard reset on your LG television. Each device is different, follow the steps below for the standard procedure for resetting:

  1. Power down the connected devices to your television.
  2. Remove the HDMI cables.
  3. Turn off your TV.
  4. Unplug the power cable.
  5. Press and hold the television’s power button for thirty seconds.
  6. Reconnect the cables.

Once done, consider powering on your various devices using a different order than you had tried initially. Users have found that reversing the turn-on sequence can restore your TV’s HDMI functions.

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ReadyToDIY is the owner of this article. This post was published on May 3, 2021.

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