Mason Blake
If your TV has sound but no picture, there could be a few possible issues. It could be a connection problem, an issue with the device connected to the TV, or a part in the TV may have failed. If it's an LG TV, for example, you can try troubleshooting by cycling through HDMI inputs until the correct video source is located. For other TV brands, you can try unplugging and reconnecting each HDMI cable at both ends. If you're still experiencing issues, you may need to reach out to a TV technician for further assistance.
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What You'll Learn
Check HDMI inputs and cables
If you have sound but no picture on your TV, there could be a problem with your HDMI inputs and cables. Here are some steps to help troubleshoot the issue:
Unplug and Reconnect HDMI Cables
First, try unplugging and reconnecting each HDMI cable at both ends, i.e., the TV end and the connected device end. Do this for every device connected to your TV. Ensure that the cables are securely connected.
Swap HDMI Cables
Use a known good cable and swap it with the cable from a particular source. For example, if you have something plugged into HDMI1 and it isn't working, try plugging it into HDMI2. Set the TV to the corresponding input and check if the issue persists.
Check Device Output Settings
Ensure that the connected device is configured to output through its HDMI connection. Check the device's output settings and ensure that the video format being output is compatible with your TV. Some devices may output a 1080/24p or 1080/30p video signal, while some TVs can only accept a 1080/60p video signal. Changing the video output format of the connected device may resolve the issue.
Connect Directly to HDMI Input
If you're using an audio system, such as an amplifier or A/V receiver, between the TV and the video source, try connecting directly to an HDMI input on the TV. If this works, your receiver or audio system may not be an HDMI repeater and could be causing the issue by not passing the signal correctly to the TV.
Use Certified HDMI Cables
Occasionally, non-certified HDMI cables can cause problems. Ensure that you are using certified HDMI cables for your connections.
If you have tried these steps and are still experiencing issues with your HDMI inputs and cables, you may need to consult the TV's manual for further troubleshooting steps or consider contacting technical support for further assistance.
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Check the backlights
If your TV has sound but no picture, the backlights may be the issue. Before you begin, make sure you have unplugged your TV and that it is turned off.
To check if the backlights are working, look through the TV's back cover. If you see light coming through the back panel, the backlights are functioning, and the problem is likely with the board. If there is no light, turn off the lights in the room to see if that makes a difference.
You can also use a backlight tester to check each LED strip for faults. If a strip shows a higher voltage reading, it is likely faulty. If you don't have a backlight tester, you can use a multimeter to check for electrical faults in the backlight circuit. Ensure the TV is unplugged to avoid the risk of electric shock.
If you determine that the backlights are not working, you can try to replace them. First, purchase a replacement strip that matches your TV's specifications. Then, align and secure the new strip, reconnect any cables, and reassemble the TV's back panel. Finally, turn on your TV and adjust the backlight settings to ensure the display is working properly.
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Check the power supply
If you have sound but no picture on your TV, it's a good idea to start by checking your power sources. Look for an LED light or a small indicator light that tells you the TV has power. If the TV does not have power while plugged in, there may be an issue with the remote, surge protector, outlet, or fuse box.
If you have power but still no picture, you could have a faulty power supply board. Power outages can cause voltage surges that damage the power supply board, so if you've recently experienced a power outage, this could be the culprit.
You can check the power supply board by following these steps:
- Ensure your TV is unplugged and remove the base to access all the screws that hold the back of the TV in place.
- Disconnect the black cable between the main board and the power supply board.
- Plug the TV back in.
- If no backlights come on, you likely need to replace the power supply board. If the backlights do come on, you know the power supply board is functioning properly.
If you don't feel comfortable checking the power supply board yourself, you can always consult a technician. They will use a digital meter to check the LED +/- outputs on the power supply board to see if they are functioning or have failed. If the power supply board is defective, it can typically be repaired for around $250, including parts and labor.
It's important to note that power supply issues are not always the cause of a TV having sound but no picture. Other potential causes include faulty HDMI connections, incorrect input or source selection, outdated firmware, and display settings. It's recommended to try troubleshooting these issues first before assuming the problem lies with the power supply.
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Check the settings software, connections, and connected devices
If you have sound but no picture on your TV, there are several troubleshooting steps you can take to address issues with settings software, connections, and connected devices.
First, check the input settings on your TV. If you are using an external sound system, your TV may have started up on a different input than the one previously used, resulting in audio but no video. Cycle through the HDMI inputs until you locate the correct video source. If you are using a home theatre or receiver as a central hub for all external devices, ensure that the TV is set to the same input as the home theatre. Additionally, make sure the home theatre is set to output from the external device connected to it.
Second, unplug and reconnect each HDMI cable at both ends—the TV end and the connected device end. Try swapping HDMI ports to determine if the issue is specific to a particular port. If the problem persists in one port but another port works, the issue may lie with a faulty HDMI port or a software glitch. Try using a different, certified HDMI cable to see if that resolves the issue.
Third, reset your TV by unplugging it for 60 seconds. Don't just turn it off—also hold the power button down for 30 seconds after it's unplugged. Then, plug your TV back in and check for a picture. If this doesn't work, try a forced factory data reset, especially if your TV is an Android TV or Google TV.
If none of these steps resolve the issue, the problem may lie with a particular connected device, a malfunction with the TV, or a failed component such as the backlights or the T-Con board.
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Try a factory reset
If you're experiencing TV sound with no picture, you may need to try a factory reset. Before you do this, it's important to check other potential issues, such as HDMI cables and sockets, as well as the power supply and backlights. It's also a good idea to consult your TV's user manual for model-specific instructions.
A factory reset will return your TV to its original settings, so make a record of any modified configurations. If you have an external USB device connected to your TV, disconnect it. Try a standard reset first by pressing and holding the power button on the remote for about 5 seconds until the "Power off" message appears. The TV will restart automatically after about a minute. If this doesn't work, unplug the TV's power cord from the electrical outlet, press the power button, wait for 2 minutes, and then plug it back in.
If the issue persists, you may need to perform a factory reset. The process for this varies depending on your TV's make and model. For example, on a Samsung TV, you can go to Settings, select Support, then Self Diagnosis, and Reset. On a Sony TV, press the HOME button, then select Settings, Device Preferences, Reset, Factory Data Reset, and finally, Erase everything. You may need to input a PIN code.
After a factory reset, your TV will start the Initial Setup wizard. You'll need to add your accounts and download any non-standard apps again. It's also a good idea to check for a firmware update, as this can solve additional issues.
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Frequently asked questions
There could be a few reasons for this. Firstly, check that all cables are securely attached to both the TV and the outlet. If that doesn't work, the issue could be related to the HDMI inputs, with problems interrupting the video signal. Try unplugging and reconnecting each HDMI cable at both ends.
The issue could be related to the input sockets or the TV settings. Check the settings software, connections, and connected devices. If the problem persists, you may need to reset your TV to factory default settings.
Refer to the instructions that came with your TV. Make sure to record any configurations you have modified as the reset will erase everything.
The backlights on your TV may have failed. Turn on the TV and shine a bright flashlight on the screen. If you can see an image, this indicates that the backlights have failed. You can replace them with aftermarket parts.
If you can't see an image, you may have a bad power supply. You can check this by removing the back of your TV and inspecting the components for any signs of burning, overheating, or failure.
