Why Is There A Blue Line On TV? Horizontal Lines Guide! 2022

Televisions are essential household items, but they’re prone to wear and tear. Over time, televisions can become less efficient and may not work as well.

In some cases, if a television is not used for an extended period of time, the power supply may go out, causing errors such as a horizontal blue line on TV screen.

A blue line on TV screen can appear for many reasons, and it’s easy to figure out what is causing it. Some of the reasons include a bad signal, a faulty cable box, or a problem with your TV panel.

Reasons for Blue Line on Samsung, Sony and Vizio TV

Samsung, Sony and Vizio are all popular brands of LCD TVs. Consequently, they all produce a blue line on their screens if something goes wrong, and here are the popular reasons as to why it happens

1. Loose AV Cable

Loose cable is the most common reason for blue lines to appear on a TV screen. If you have loose cables connected to your TV, the signals can get disrupted, which can result in the appearance of blue horizontal lines. If this happens, all you need to do is check the cable and tighten it to fix the problem.

2. TV Doesn’t Support the Resolution

If you’re experiencing a blue line on your TV (or different colors, depending on the TV), then it’s because there is a mismatch between the signal resolution and the TV’s native resolution.

For example, if you are watching 720p content, but your TV is a 1080p native panel, then sometimes the signal will look fuzzy due to a down-conversion of the signal, resulting in lines of different colors appearing on your screen.

Vertical blue lines on the screen also happen when TVs try to support resolutions (e.g., 1440p) that aren’t supported by the TV manufacturer.

There are ways to force resolutions from within some gaming consoles and PCs, but doing so could cause other issues with image quality, such as jagged edges or reduced brightness/contrast levels.

3. Faulty LCD Panel

If you are getting a thin blue line on TV screen, it is either an issue LCD Panel or the T-CON board. Most of the time, it is the LCD panel that is the problem. Panels have a life, and they wear out over time as every other electronic.

The image that you see on an LCD display is made up of tiny red, blue and green pixels. Each pixel has a transistor behind it that charges up and holds its brightness for a brief period of time while a new line of video information is scanned across it from left to the right.

When there is a horizontal blue line in the picture, this means pixels have been damaged or dead and should be replaced.

4. Poor TV Signal

There can be many potential causes for blue lines to appear on a television screen. One possible culprit is a poor TV signal. When the signal is weak or unstable, it can cause blue lines to appear on the screen. Another common cause of these lines is a bad video card or graphics processor.

If these components are not functioning properly, it can result in distorted or garbled images on the screen. In some cases, these lines may even be accompanied by a buzzing noise. If you are experiencing this issue, it is best to consult with a technician to determine the source of the problem and how to fix it.

5. Problematic Power Supply Unit (PSU)

TVs are susceptible to a variety of problems, the most common of which is a bad power supply. When the power supply goes out, it can cause blue lines to appear on the screen. In severe cases, the TV may not turn on at all.

Blue lines on a TV screen can be disconcerting, and if you have a TV that is a few years old, it is often a sign of a serious issue with the power supply. Unfortunately, they can also be caused by a number of other issues, including a faulty power cord or adapter, a blown fuse, or an issue with the power supply itself.

If you suspect an issue with your power supply, you may want to try unplugging your TV and removing the cables that go into the panel for a few minutes and then plugging it back in.

Also, make sure there are no bulging capacitors in this area as well since they indicate an issue with either voltages or temperature. If you see circuit burn marks on your power supply unit (PSU), then it’s likely caused by an internal short circuit which may be due to faulty soldering somewhere else in your TV.

6. Dust in connectors

Dust particles in the air can cause problems with televisions. The dust can accumulate on the connectors and cause blue lines to appear on the screen. If you think this is the problem, then opening up your set will be necessary.

First of all, unplug your TV from its main power outlet. Next, remove the screws from the back panel and take it off, but take care not to touch any of the circuit board components inside.

Once you have removed it, clean out any dust or grime that has accumulated in there using a can of compressed air. Then gently wipe down all of your connectors with a dry cloth and check them for signs of pulling away or breaking.

If everything looks fine and in place, put the back panel back on and reattach all of the screws before plugging in your TV again.

Why are you seeing blue lines on your Samsung TV?

Samsung TV blue lines can be because of the faulty panel or dust in connectors. If the blue lines are only on one side of the screen or in the middle, it is most likely due to a faulty panel. If they are on both sides, it is more likely that there is dust in the connectors.

One common solution is to unplug the TV for a few minutes and then plug it back in, as this seems to reset the system and clears up the blue lines. Some people have also had success by adjusting the brightness and contrast settings.

Reasons as to why are you seeing a blue line on an LG TV screen?

When you see a blue line on your LG TV, it’s important to determine whether the issue is with the power supply or the main panel. If it’s the power supply, you may be able to fix the issue by replacing the power supply. If it’s the main panel, you’ll likely need to replace the entire TV since replacing the panel is not worth the cost.

The common reasons for the Blue pixel line on the Vizio TV screen?

If you see a blue line on your Vizio TV, the panel may be failing. A failing panel is the most common reason for this issue, and unfortunately, it’s usually not something that can be fixed by yourself. The best thing to do is to contact Vizio to see if they can help you get a new panel.

How to fix blue line on TV screen?

Vertical lines on the TV screen can be caused by many different problems. Most of the time, you may be able to fix the blue line problem by yourself. Most blue lines appear due to a loose connection between your TV and the input device, like a streaming stick or cable box.

The issue can also be caused by a faulty cable, your TV’s firmware glitch, or dust getting into the connectors. In any case, it’s best to try some easy solutions first before taking more drastic measures such as resetting your TV to its factory settings.

1. Open the back panel and tighten the connectors

If the blue line is still on your screen, it may be a problem with a cable. Unscrew and open the back panel of your TV and make sure that all connectors are tightly tightened. If they are not, tighten them as well as you can.

Then check to see if the blue line has disappeared from your TV. If it has, turn off your TV and then turn it on again to see if the blue line reappears.

2. Remove dust from the cables and connectors

You can remove dust from your cables and connectors on a regular basis to ensure that they’re not causing the blue line on your TV screen. To safely dust the connectors, use a soft cloth to wipe them gently.

Do not use metal brushes or other hard materials, as these could damage your connector’s surface. You should also carefully vacuum all of the cables with a low-powered vacuum cleaner or use a blower to clear them from grime.

Make sure to clean any cables that you often disconnect and reconnect as well, since these are more likely to accumulate dust over time. It is also a good idea to open the case and see if a dust buildup is causing the blue lines to appear on the screen.

3. Gently press the blue line on the TV

To fix the blue line, turn off your TV and gently press the screen where the blue line appears. Repeat this several times until you see your blue lines disappear. However, this solution rarely works, but there is nothing wrong with giving it a try.

4. Turn the TV off and on

There’s likely nothing more frustrating than watching your favorite show or movie and having to deal with a blue line running down the center of the screen. While it may seem like a minor issue, this can be quite distracting and make it difficult to enjoy what you’re watching.

Fortunately, there is a quick and easy fix for this problem: turning the TV off and on again. The process resets the TV and usually gets rid of the blue line. If the blue line comes back, turn it off and on again until it goes away.

5. Check for any firmware update

If you are experiencing blue vertical lines on TV screen, one thing you can do is check for any firmware updates that might fix the problem. You can usually find these updates by visiting the manufacturer’s website or by checking your TV’s support page. If an update is available, download and install it as soon as possible.

If there are no firmware updates available, try resetting your TV to its default settings. Doing this can sometimes fix minor configuration problems. If that doesn’t work, it might be necessary to call customer service and have them walk you through some troubleshooting steps.


A single blue line on TV screens is an annoyance for many viewers. It can be distracting and cause eyestrain. Some simple steps can be taken to minimize the impact of this line, but it may not be possible to eliminate it altogether.

While blue lines may not seem like a big deal, they can be indicative of a serious issue, usually a failing panel. If you are experiencing this issue, be sure to contact your television provider for help.

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