Onn Roku TV No Picture But Sound Troubleshooting Guide

If your Onn Roku TV has no picture but sound, don't worry, it's a relatively common issue that can be fixed with some troubleshooting.

First, check the power cord and make sure it's securely plugged into both the TV and the wall outlet. Sometimes, a loose connection can cause the picture to disappear.

Try unplugging the TV from the power outlet, waiting for 30 seconds, and then plugging it back in. This simple reboot can often resolve the issue.

Try power cycling your TV a few times as the first step, which can resolve the issue in about 30% of cases.

To power cycle your TV, switch it off, unplug it, hold down the physical power button for 15 seconds, wait for 2 minutes for residual power to drain, and then plug it back in.

A software glitch on newer ONN Roku models can also cause a black screen with sound, which can be resolved by power cycling.

If power cycling doesn't work, check for poor connections in internal cables, such as the cable connecting the power board to the main board or the cables connecting the T-Con to the main board.

You can fix a loose cable in about 10 minutes, but if the cable is not making a proper connection, you may need to replace it.

Internal component failure on the main board can also cause a black screen, which can be checked with a multimeter and potentially fixed by replacing the failed component or the entire board.

Backlight failure is another common cause of a black screen, which can be checked with the flashlight test and potentially fixed by replacing the backlights.

Here's a summary of the most likely causes of a black screen on an ONN TV:

Try to rule out other issues with your TV by checking the internal boards and making sure the issue isn't caused by HDMI or faulty surge protectors.

About 5% of users experience HDMI problems, so let's start by checking our external connections.

Faulty HDMI cables, damaged HDMI ports, or poor connections can cause the issue.

Take a look at any HDMI or other physical cables connected to the back of your TV. Check for any signs of damage or wear.

If you have compressed air, use it to clean the contacts on the cable and the TV's connector. If not, blow gently on them.

Make sure your TV is off, then firmly push the cables back into their slots on the TV.

Switch your TV back on again.

If that doesn't fix the problem, try using a different HDMI input. Most TVs have 3 or 4 HDMI ports, so check if your TV has any available.

If you have one HDMI port on a different part of the TV, that's the best one to try, as it should have a separate connection to the TV's main board.

If you now have a picture, you'll need to troubleshoot your HDMI cables and/or connected devices.

If this doesn't help, you'll need to take a closer look at your TV's internal connections.

Resetting your Onn Roku TV is a straightforward process that can resolve the issue of no picture but sound. You can try a power cycle, which involves stopping the TV's electrical income for a continuous amount of time until all of the residue voltage has drained.

To power cycle your TV, press the "Power" button on the remote, then unplug the TV's power adapter and wait for 60 seconds. Reconnect the power cable back into the outlet and check if the black screen fault persists.

Alternatively, you can try a soft reset by going to Settings > System > System Restart and selecting the Restart option. This method can also help resolve issues like the black screen with sound problems.

If the power cycle method doesn't work, you can try restarting your Onn Roku TV using a special remote key combination. Press the home button five times, then tap up once, press the up arrow once, and then rewind twice and fast forward twice.

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This process will reboot your TV twice, and it's essential to wait for the full 2 minutes before plugging your TV back in to ensure it has fully reset.

Here's a summary of the steps to reset and restart your Onn Roku TV:

Remember to wait for the full 2 minutes before plugging your TV back in after trying the remote key combination. If you're still experiencing issues, try repeating the steps a few more times to ensure a complete reset.

Hardware issues can be a major pain, but fortunately, there are some common culprits that can be easily identified.

The most common cause of a black screen with sound is a backlight failure, which affects over 60% of cases. This is usually due to a problem with the inverter or the backlight itself.

To check for backlight failure, turn off the lights in the room, turn on the TV, and shine a flashlight directly at the screen. If you see faint images, it's likely a backlight issue.

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Here's a simple table to help you diagnose the problem:

– If the backlight is not working, you most likely have a main board issue.

If the backlight is working, but you don't see faint images, it's likely a T-Con issue.

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If your Onn Roku TV is experiencing power supply issues, there are a few things you can check.

First, ensure the TV's power adapter is in good condition. If it's damaged or worn out, it might not be providing the necessary power to the TV.

Replacing the power adapter with a new one could resolve the issue.

To troubleshoot further, try connecting the Roku TV to a different electrical outlet. This will help determine if the problem is with the TV itself or with the electrical supply.

Removing all third-party power equipment in the setup can also help isolate the issue.

Here are some steps to follow:

If you're still experiencing issues, it's possible that the power supply is faulty and needs to be replaced.

Inspecting the backlight is a crucial step in diagnosing the issue with your ONN TV. If the problem persists, it's worth considering that the backlight panel might be faulty.

A faulty backlight means the pixels aren't being illuminated enough to display a picture. To check if the backlight is the issue, turn off all the lights in the room and make sure the TV is turned on. Then, take your phone's flashlight and shine it closely at the TV screen.

If the backlight is working, you should see a faint glow on the screen. However, if the backlight is not working, you might see faint images on the screen, which indicates a backlight failure. According to the data, backlight failure is the most common cause of the problem, occurring in over 60% of cases.

Here's a summary of the flashlight test results:

If you're not comfortable with a larger repair job, it's best to seek help from a professional. Replacing the backlights can be a complex process, requiring you to remove the back panel, circuit boards, and connectors, and even the LCD panel.

If your backlight is working and you have sound, it's likely that you have a T-Con issue. The T-Con is a common culprit behind TV screen problems, and one or more of its internal clocks failing can result in artifacts appearing on the screen.

The T-Con issues often show as artifacts or ghosting on screen if the board is failing or cables are loose, and a totally black screen if the board has completely gone. If your backlight is working, but you don't have sound, you most likely have a main board issue.

To check the T-Con, unplug your TV, reconnect the cable between the power board and the main board, disconnect one of the T-Con cables going to the panel, and plug your TV back in and switch it on. Repeat these steps swapping over which LVDS cable is connected.

If you have no picture regardless of which LVDS cable is connected, then you need to double-check that the problem is with your T-Con itself, or the main board.

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Here's a table to help you troubleshoot:

If the flashlight test DID show faint images and a FAILED backlight, try totally disconnecting the T-Con. If your backlight now powers up, you need to replace the T-Con. If not, you need to replace the main board.

It's also worth checking the tab connectors, which are small PCBs that further process the signal. Look for any signs of corrosion or damage, and check for a loose tab bond between the PCB and the panel.

Unfortunately, these tab bonds, and therefore the tab connectors, are not user-replaceable, as they are factory-bonded to the panel. Any fault here means that you need a new panel.

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Updating your Onn TV's firmware can resolve the issue of no picture but sound. Outdated software or firmware can cause this problem, so it's essential to keep your TV's software up to date. Make sure to update your Onn TV's firmware to avoid potential bugs that may affect display performance.

Updating the firmware can be a bit of a process, but it's worth it to ensure your TV is running smoothly. To update your Onn TV's firmware, follow the detailed process outlined in the article.

If your ONN Roku TV has no picture but sound, the first step is to try power cycling your TV a few times. This is a simple fix that can often resolve the issue.

The most common cause of this problem is a backlight failure, which can be checked with the flashlight test. This test involves shining a light on the screen to see if the faint image of the picture appears.

You can also try checking the cables that connect the power board to the main board, as well as the cables connecting the T-Con to the main board. These cables are notorious for coming loose or not making a proper connection, which can result in the screen not coming on.

A software glitch can also cause this issue, especially on newer models like the ONN Roku models. In this case, power cycling your TV should resolve the problem.

Here are the possible causes of an ONN TV with sound but no picture:

It's worth noting that if you have a backlight failure, you can fix it at home in about 30 minutes with about $30-50 worth of new LED strips.