How to fix LG half black screen

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Written By Dinu Sri

Dr H. T. D. S. Madusanka is an electronic expert with 10 years of experience, involved in the research and development of SMART HOME systems.

Encountering a half-black screen on your LG TV can be both frustrating and concerning. This issue can manifest in various ways, such as one side of the screen going completely dark or displaying distorted colors. While the problem might seem daunting, it’s often solvable through a series of troubleshooting steps. The causes can range from software glitches to hardware malfunctions, including issues with the T-Con board, LED backlights, or even the HDMI cables.

Here’s a quick how-to guide for fixing a half-black screen on your LG TV:

  1. Power Cycle the TV: Turn off your LG TV, unplug it from the power supply, and disconnect all devices. Wait for at least a minute before plugging it back in and turning it on.
  2. Check HDMI Cables: Inspect the HDMI cables for any signs of damage or loose connections and replace or secure them as needed.
  3. Update Software: Navigate to the settings menu on your LG TV and ensure that the software is up-to-date.
  4. Self-Diagnosis Feature: Use the self-diagnosis feature available in LG TV models from 2018 to 2021 to check for any hardware issues.
  5. Consult a Technician: If all else fails, it may be time to consult a technician for a more in-depth diagnosis and possible hardware replacement.

Why is half of my LG TV screen dark?

Having your screen half black simply means there is an internal problem. Some are not that serious, while others may need a technician or, worse, a TV replacement. Please don’t freak out, we are in this together.

However, if your TV is still under warranty, please don’t perform any troubleshooting step that needs you to open it. Contact the manufacturer, and they will help you out.

There are several reasons why your LG TV is half black. Let’s mention a few of them.

Remote issues

To operate the television, you need a remote. If it is not responding or sending the command signals efficiently, you can’t instruct the device. However, in most cases, when the remote is the problem, the TV is entirely black and not half black.

However, there will be no harm in first checking if the remote is working well first. 

Outdated or faulty software

Television uses software that instructs the TV to do after receiving the commands. In most cases, this firmware is pre-installed for you. 

However, due to the dynamic nature of the technology, there are frequent releases. Consequently, it is vital to ensure that you have the latest software on the market.

If not, such issues as a half-black screen may emerge, or worse, viruses may attack it.

Power supply issues

Televisions usually have multiple supply boards. If one is faulty, it will hinder the normal functioning of your expensive LG TV.

Connectivity issues

TVs use cables to transfer data to their peripheral devices. One of them is the HDMI cable. HDMI cables are pretty fragile. Hence, bending or twisting them can cause damage.

Additionally, there are the power cables. If these cables are malfunctioned or loosely connected, it could cause an improper display on the screen.

Faulty backlight 

Most LG devices make use of a backlight. If the backlight is non-functional, the pictures will not be displayed. Therefore some parts will be invisible.

You can use a flashlight to check if the pictures are displayed in the background. 

Electronic interference

Besides the power supply issues, LG televisions are prone to electromagnetic signal interference. In simple worse, electromagnetic interference is unwanted noise, also called interference in an electric circuit.

Symptoms of a screen infected with this circuit issue are shaky pictures and dark screens.

You should not place large electronic devices such as microwaves close to your LG TV to prevent it.

Buffer boards

Buffer boards control the brightness and darkness of the images displayed on the screen. Consequently, if you have a malfunctioned board, the backlight may go out of the screen, cutting off the number of pictures shown by the TV. 

How do I fix a half-black screen on my TV?

We have highlighted some of the causes of your problem. But we are not stopping there until you resolve it. Thus, let us look at how you can fix your half-black screen.

1. Fix the cables correctly

If your cable is malfunctioned, then you will have to replace it.

Otherwise, if it is loosely connected, for instance, the power cable, you can tighten it to ensure that data or the electric signals are well conveyed.

Further, you can use the self-diagnosis feature incorporated in the 2018 to 2021 LG TV models. This feature will help you determine if the HDMI cable is damaged. 

Step 1: Navigate to quick help screen

There are two ways to get to the quick help screen.

One, you can use the long-press #9 button on your remote.

Alternatively, you can either move to the settings screen by clicking the settings icon on the remote or displaying the home screen and then clicking on the settings bar.

Next, select the All Settings tab, which will display a page with a quick help tab. Click on that tab, and let’s get moving.

Step 2: Select optimization settings

On your current screen, select optimization settings

Step 3: Check items

After the optimization test is over, go one screen back and select Check Items.

Step 4: Check the status

On the list displayed on your screen, select check status of your TV

Step 5: Specify the diagnosis

If you have done all the above steps correctly, your screen should display a list of diagnoses you can perform. Select RF/HDMI diagnosis.

Step 6: Start the diagnosis

Select start diagnosis and wait for your TV to do the rest.

If your HDMI has issues, it will be displayed. 

You can also check this video on fixing the LG TV half-black screen.

2. Diagnose the T-Con Board

T-con boards are predominant in the LG LCD TV. This TV component translates the video signal into bars. Thus, if it is faulty, parts of the video may appear dark. Follow the below instructions to check if it is faulty.

  1. Remove the back cover of the device
  2. Disconnect all the cables that are directly connecting to the T-con board
  3. Find a red-colored cable with a horizontal connector, connecting to several other thin cables and disconnecting it.
  4. Keenly, look at tall pins checking if they are warped o9r damaged. You can use a magnifying glass to prevent your eyes from straining and clearly see the pins. 
  5. Check if the cases or the thin wires are damaged
  6. Look for foreign materials or dust particles on the connectors while verifying that the connections are not loose or partially disconnected.

3. Check your picture settings

Additionally, your display settings might be the cause of the half screen.

First, change the picture aspect ratio to ‘just scan.’ 

If that doesn’t correct the half-black screen, check if the TV supports the manual position. If it does, use the remote arrow keys to move the image towards the dark part of the screen. 

If the picture settings were the problem, hen moving the image should correct it. Otherwise, if the image disappears when moved to the black part, picture settings are not the problem. 

4. Refresh and renew

How would you suggest I reset the TV while I can barely see the screen? Well, as long as you have the remote, you can reset the TV. How?

Most LG TV models have remote shortcuts that can reset the device. For instance, you can reset them in some models by pressing the menu button for approximately 15 seconds.

You can check your manual for more guidance. 

5. Seek professional help

Even though it might be hard to admit, at this point, you might have to incur costs to hire a technician. Additionally, if the device is still under warranty, you can also call your manufacturer. 

Top of LG TV screen is dark problem fix?

The causes of half black screen on the left side are similar to the causes of a top dark screen.

Likely your T-con, which is responsible for converting the images to bars, is faulty, or your cables are loosely connected or damaged.

Moreover, your software might be outdated, or worse, your device might have been infected by a virus.

Before consulting a professional, you can try out some of the fixes discussed above. However, if you cannot restore your device, do not shy away from asking for help.

LG TV screen half black half white problem fix?

In other cases, you might also be dealing with half black and half white screens. Consequently, you can’t even see the screen partially.

If you face such a predicament, you will not be able to perform fixes that need you to see a part of your screen, such as checking the picture settings.

However, you can perform other fixes, such as checking the cabling system, cleaning the T-con board, and checking the power inputs. 

How do I fix the full black screen on my LG TV?

Additionally, if the screen is entirely black, you can perform the below fixes;

  • You need first to check if your remote is working.
  • Similarly, you should check the power supply system and ensure that the power input cables are well connected.
  • Further, you can unplug the TV, wait for at least 10 to 15 minutes and then turn it on.
  • Lastly, you can also use the remote shortcuts to reset the TV.
Categories LG