Don’t regret if the HDMI connection is not working on an LG Smart TV. It happens if there is a problem with the HDMI cable or the TV’s port. Sometimes, you may forget to change the input on the LG TV and assume that HDMI has an issue. Besides that, technical bugs might cause HDMI to show a black screen on LG TV.
Luckily, most HDMI issues can be rectified easily with troubleshooting methods. If there is an issue with the TV’s motherboard, you will get no signal on the LG TV. In such cases, you can visit an authorized LG service center to repair the TV.
How to Fix HDMI Not Working on LG Smart TV
The LG TV HDMI not working issue occurs at times due to malfunction, loose or faulty cables, firmware issues, and more.
- LG TV Doesn’t Detect/Recognize HDMI
- LG TV HDMI Keeps Disconnecting
- TV Not Accepting HDMI Input
- LG TV Displays No Signal from HDMI
LG TV Doesn’t Detect/Recognize HDMI
HDMI may not work on LG TV when the device fails to recognize the HDMI connection.
- The HDMI port on the TV or external device is damaged
- Incorrect HDMI settings on TV or external device
- Motherboard malfunctions
You can follow the troubleshooting ideas given in the below section to fix the error easily.
1. Try Different HDMI Input
If you have connected the device to the wrong HDMI port, your TV won’t get signals from it. So, change the input using the following steps.
 On your LG TV remote, press the Input or Source button.
 You will get different HDMI ports.
 Select the different HDMI ports and see if the HMDI port works well or not.
If your TV remote does not have the input or source button, use the following steps.
 On your remote, press the Home button.
 Move the remote cursor to the top corner and click the Input or Source icon.
 From the options, choose the input you want to activate.
2. Repair or Replace the Motherboard
When the HDMI port completely stops working, you can replace the motherboard with the new one. A faulty motherboard may also be the reason for the HDMI ports not working on LG TV. We recommend users try these steps with the help of a TV technician.
 Using a screwdriver, eject the screws on the back of the TV.
 Then, from the motherboard, disconnect all the cables and connectors.
 Unscrew the motherboard from the LG TV wall and slide the new board into place.
 Insert the screw back into the TV and connect the new motherboard.
 Ensure you attach them firmly and check whether it works.
LG TV HDMI Keeps Disconnecting
HDMI on the LG Smart TV may not function properly when the cable keeps disconnecting.
- Faulty HDMI cable
- Poor HDMI connection
Using the right HDMI cable is vital if you don’t want to encounter an LG TV HDMI ARC not working issue.
1. Check the HDMI Port and Cable
Before proceeding with the advanced steps, check your HDMI cables, ports, and input on the TV and the console. To see whether the problem is with the HDMI cable or port, try using different cables. Also, inspect whether the pins on your HDMI link device are damaged or not. If you find any bent pins, you need to contact the service center.
While plugging the HDMI cable, sometimes there is a chance of getting damaged, So check if there is any damage inside the port. If there is any physical damage, you can buy a new HDMI cable.
2. Disable HDCP
HDCP is the protection encode developed to prevent unauthorized material sent via HDMI connection and devices. If your connection keeps disconnecting, the HDMI-attached device is not accepting the encrypted high-definition content. So, turn off the HDCP and see if the error is fixed. You can also try disabling the deep color function with the below steps.
 Visit Settings and select the All Settings option.
 Choose Picture.
 Navigate to Additional Menu settings and select the HDMI Ultra High Definition Deep Color option.
 Now, choose the HDMI port to which the device is connected.
 Finally, press the remote control’s button to turn it off.
LG TV Not Accepting HDMI Input
At times, LG TV itself will not accept the HDMI input and this may be the primary cause for HDMI to not work on your LG smart TV.
- Improper TV settings
- Using the HDMI switch to connect the HDMI device and amplifier
- Unsupported resolution
You shall try the fixes below, and with this, your LG TV may accept the HDMI input.
1. Change Screen Resolution
If the resolution setting of the device is not compatible with the resolution of your LG TV, then you will get the No HDMI Signal message on your TV screen. This happens because your LG TV won’t be able to display the higher resolution that it is capable of. You can change the resolution of the LG TV or a connected device to fix the issue.
 Go to the Resolution Settings or Video Output Settings on your connected device.
 Select the Auto option, or you can manually set the resolution of your TV.
 Your TV resolution will usually range from 480p to 1080p or higher.
2. Disconnect Amplifier
Sometimes, you might face certain issues if you’re using the HDMI switch to connect both the HDMI device and amplifier. Verify whether the input on the amplifier is reflected in the input on the TV.
 Switch off your LG TV and unplug the cable from the power cord.
 Then, unplug the HDMI switch from the TV and the amplifier connection.
 Wait for a few minutes, plug it back into the TV, and see if the HDMI port is working properly.
 You can also turn off the amplifier completely and connect the video interface to the HDMI input.
LG TV Displays No Signal from HDMI
Sometimes, LG TV will not detect the HDMI connection and will display no signal from HDMI when the device requires any update.
- Technical glitches
- Improper power supply
The HDMI not signal issue on the LG Smart TV can be fixed with the troubleshooting methods listed below.
1. Power Cycle LG Smart TV
 Turn off your LG TV and unplug the power cable from the power socket.
 Wait for a few minutes, plug the power cable back into the socket, and turn on the LG TV.
 This will power cycle your LG TV. Now, check if the TV lets you access HDMI.
2. Update LG TV
If you’re using the older version of LG TV, you will probably have several errors and issues. So, you must update the LG TV to the latest software regularly.
 Tap the Home button and select the Settings option from the home page.
 Then, select the All Settings option.
 From that, choose General and click the About this TV option.
 If any new update is available, you will see it under the TV.
 Tap Install or Download and Install to begin the update.
 Once updated, see if the HDMI port is working.
3. Turn Off Sleep Timer
Sometimes, the LG TV will enter into sleep mode. If it doesn’t work, you should disable the Sleep Timer on the LG TV to fix the issue.
 Press the Settings button on the remote.
 Go to All Settings and click General.
 Select System, click Time & Timer, and choose Timers.
 Click Power On Timer and toggle Off.
4. Turn Off Standby Mode
You must turn off the Standby mode on LG TV to fix the HDMI connection issue.
 Go to Settings and click All Settings.
 Select General and choose Additional Settings.
 Choose Eco Mode and click the Auto Power Off option.
 Select Off to disable the Standby mode.
5. Factory Reset LG TV
Remember that performing a factory reset on LG TV will erase all the stored information or data and the customized settings.
 Tap the Home button on the remote control.
 Click the Settings icon and choose General from the Settings page.
 Tap the Reset to Initial Settings option.
 Now, provide the TV’s four-digit password and click OK.
It will restart your LG TV to finish the resetting process. Once turned on, check whether you can access HDMI connections.
Contact LG TV Support
If none of the HDMI ports are not working on LG TV, you can contact LG customer support by visiting its official website. Explain the issue to them, and they will help you to sort it out. Check the warranty of the LG TV. If your TV is under the warranty period, claim a free replacement for the HDMI port of the LG TV
Yes. Use the LG ThinQ app as a virtual remote to change LG TV HDMI settings.
It is because of loose cabling or due to damage in the cable. If HDMI is undetected, use a new cable to connect your Xbox to an LG TV.
You should connect the HDMI cable to the correct port (eARC) to avoid getting no signal issues on the LG TV.