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Why does my Hisense TV have blue lines?

As an owner of a Hisense TV, I was incredibly frustrated when I noticed blue lines appearing across my screen. After some research and testing, I found out that this issue is actually quite common with Hisense TVs and can be caused by a variety of issues.

The most common causes of the blue lines issue are loose or blocked cable connections, visual screen or component damage, or a faulty t-con board. 

Blue lines on a Hisense TV can be caused by various issues, including loose or blocked cable connections, visual screen or component damage, and a faulty t-con board.
To fix the blue lines on a Hisense TV, check the cables, check for damage, change the TV input, and perform a picture test.
If the issue persists, contact technical support for further assistance.

Why does my Hisense TV have blue lines?

There could be many causes of blue lines on your television, with the most common being:

Loose cables

A common cause is loose cables. Loose cables indicate there’s a poor connection to the television from another device. If you’ve shifted around your TV, this could be the reason you’re experiencing blue lines.

Material or debris cable disruption

Another common cause is debris interrupting the connection. Debris, dust, or other material could interrupt the connection, so it’s also important to clean out the connector piece before reconnecting the cable and television. Don’t forget to check the other end of the cable as well.


It is also possible that your TV is actually faulty.

Damage to the screen or unit due to impact from an object or the floor is one of the leading causes of anomalies.

The backlighting component inside your set provides the screen with light, so if it gets damaged or blocked, the light will only shine through on certain lines.

Another part that could be damaged is the screen. If it absorbs some sort of impact, it can cause a variety of line colors to appear, including blue.

Faulty t-con board

A Hisense T-con board generates the vertical and horizontal timing panel signals while enabling signals and providing panel boas.

This component looks like a computer motherboard and controls the logic gate signal and serves as the source for propelling the thin-film transistor (TFT) LCD.

Since this component directly controls the vertical and horizontal signals, it could cause blue lines to appear.

How to fix the blue lines on a Hisense TV

Read more: Why does the sound on my Hisense TV stutter?

The blue lines could be a simple or complicated fix, depending on if there’s damage to any part of the television. However, below are options you have when getting rid of them.

Check the cables

The first step you must take is to check both ends of all video cables.

As mentioned earlier, the connections could be loose, especially if you recently shifted around the television, or could have material blocking the connection between the cable and the TV input or set-top box output and cable.


Next, conduct a visual search for any damage that could be present. If the TV has recently fallen on the ground or sustained some form of impact, then you want to

Television settings

If the root cause isn’t due to damage or loose cables, try changing your TV’s video settings.

Start by switching the TV input to a different HDMI port since the one you’re using could be defective or damaged.

This can also help rule out different ports. Remember to switch the input on the television as well so you don’t receive a “no signal” error.

T-con board

While this may seem like an outdated gesture from the analog antenna days to get the picture to show but give the back of your TV a tap.

This sometimes causes the internal componentry to reconnect if loose. If it briefly works but lines reappear, then you may have problems with your T-Con board.

Once the T-con board is damaged, faulty, or has an issue, it will need to be replaced to ensure a properly functioning television.

Picture test

Read more: Why does my Hisense TV have dead pixels?

Many modern Hisense TVs have an integrated feature that allows you to see if your display is corrupted.

Different Hisense models have different interfaces that display this information, but you can usually find this function in the settings menu along with a support or troubleshooting option.

Some models just have a picture test option that provides the results. This is a crucial step if you’re planning to contact technical support.