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In this article, you will learn why your LED TV may have a half-dark screen. We will discuss various brands like Samsung, LG, Sony, and more to provide you with a comprehensive understanding of the issue. By exploring the possible causes of this problem, you will gain insight into how to troubleshoot and potentially resolve it. So if you’re experiencing a half-dark screen on your LED TV, keep reading to find out what might be causing it and how you can fix it.

Why LED TV Half Screen Dark?

Why LED TV Half Screen Dark?

LED TVs have become increasingly popular due to their sleek design and high picture quality. However, one common issue that some users may encounter is a half dark screen. This can be frustrating and can significantly affect your viewing experience. In this article, we will explore the common causes of a half dark screen on an LED TV and provide troubleshooting steps to resolve the issue.

Common Causes

There are several common causes for a half dark screen on an LED TV. It is essential to identify the underlying cause to effectively troubleshoot and resolve the issue. The following are the most typical reasons for this problem:

Faulty LED backlight

The LED backlight is responsible for illuminating the screen and providing brightness. If the backlight is faulty, it may not evenly distribute light across the screen, resulting in a half dark display.

Loose or damaged cables

Cables that connect various components of the TV, such as the backlight and driver board, can become loose or damaged over time. If the cables are not securely connected or are damaged, it can lead to a half dark screen.

Faulty LED driver board

The LED driver board controls the power supply to the LED backlight. If the driver board is faulty, it may not provide sufficient power to the backlight, causing uneven illumination and a half dark screen.

Troubleshooting Steps

Once you have identified the possible causes for the half dark screen on your LED TV, you can try troubleshooting the issue using the following steps:

Check the backlight settings

First, check the settings on your TV to ensure that the backlight is correctly configured. The backlight settings can usually be adjusted in the TV’s menu or settings options. Make sure the backlight is set to an appropriate level and not dimmed or turned off.

Inspect and reconnect cables

Carefully inspect the cables connecting the LED backlight and the driver board. Look for any visible damage, such as frayed wires or loose connections. If you find any issues, try reconnecting the cables securely. Ensure that each cable is correctly plugged into its respective port.

Test the LED driver board

If the backlight settings and cables appear to be in good condition, the next step is to test the LED driver board. To do this, you may need to consult the TV’s user manual for specific instructions on accessing and testing the driver board. If the driver board is found to be faulty, it will need to be replaced.

Replacing the LED Backlight

If the troubleshooting steps mentioned above do not resolve the issue, it may be necessary to replace the LED backlight. Follow these steps to replace the backlight:

Identifying the right backlight model

Before purchasing a new backlight, you need to identify the correct model. Refer to the TV’s user manual or contact the manufacturer to find out the specific backlight model compatible with your TV.

Removing the old backlight

To remove the old backlight, you will need to disassemble the TV. This process can vary depending on the TV model, so it is essential to consult the user manual for detailed instructions. Once you have accessed the backlight, carefully disconnect any cables or connectors and remove the backlight from the TV.

Installing the new backlight

After removing the old backlight, install the new one in its place. Connect any necessary cables or connectors securely. Ensure that the new backlight is aligned correctly and fits snugly. Finally, reassemble the TV following the reverse order of disassembly.

Repairing Loose or Damaged Cables

If loose or damaged cables are the cause of the half dark screen, you can try repairing them using the following steps:

Locating and inspecting the cables

Identify the cables that connect the LED backlight and the driver board. Carefully inspect each cable for any visible damage, such as cuts or frayed wires. If you find any damaged cables, they will need to be repaired or replaced.

Repairing or replacing the damaged cables

If the cables can be repaired, carefully strip the damaged section and reconnect the wires using wire connectors. If the cables are severely damaged, it is best to replace them entirely. Refer to the user manual or contact the manufacturer for guidance on obtaining replacement cables.

Reconnecting the cables securely

After repairing or replacing the damaged cables, reconnect them securely to their respective ports. Ensure that each cable is correctly plugged in and that the connections are tight.

Fixing the LED Driver Board

If the LED driver board is found to be the culprit, you can try fixing it by following these steps:

Identifying the faulty LED driver board

To identify the faulty LED driver board, you may need to consult the TV’s user manual or seek professional assistance. Once you have identified the faulty board, you can proceed with the repair.

Removing the old board

To remove the old LED driver board, disassemble the TV following the instructions provided in the user manual. Carefully disconnect any cables or connectors connected to the driver board. Remove the screws or fasteners securing the board in place and gently lift it out.

Installing and testing the new board

Install the new LED driver board in the same position as the old one. Secure it with screws or fasteners, and reconnect any cables or connectors. Once the new board is in place, reassemble the TV and power it on to test if the half dark screen issue is resolved.

Professional Assistance

If the DIY troubleshooting and repair methods are not feasible or successful, it may be necessary to seek professional assistance. Here are some options you can consider:

Contacting the manufacturer

Reach out to the manufacturer’s customer support for guidance and assistance. They may be able to provide troubleshooting steps or recommend authorized service centers for repairs.

Hiring a professional TV repair service

If your TV is not under warranty or the manufacturer does not offer assistance, you can hire a professional TV repair service. Ensure that the service provider is reputable and experienced in repairing LED TVs.

Checking warranty and repair options

If your TV is still under warranty, check the terms and conditions to determine if the issue is covered. Follow the warranty instructions for repair or replacement options.

Preventive Measures

To avoid encountering a half dark screen issue on your LED TV in the future, consider implementing the following preventive measures:

Avoiding excessive heat exposure

LED TVs can be sensitive to excessive heat, which can cause malfunctions. Ensure that your TV is placed in a well-ventilated area and avoid exposing it to direct sunlight or placing it near heat sources.

Using surge protectors

Power surges can damage the components of your TV, including the backlight and driver board. Use surge protectors to safeguard against sudden increases in voltage and protect your TV from potential damage.

Properly handling and cleaning the TV

Handle your TV with care, avoiding any unnecessary physical stress or impacts. When cleaning, use a soft, lint-free cloth and mild cleaning solutions specifically designed for electronics. Avoid using harsh chemicals that may damage the screen or other components.

Why LED TV Half Screen Dark?


Diagnosing and resolving the issue of a half dark screen on an LED TV requires identifying the underlying cause. Common causes include faulty LED backlights, loose or damaged cables, and faulty LED driver boards. By following troubleshooting steps such as checking backlight settings, inspecting and reconnecting cables, and testing the LED driver board, you can attempt to resolve the issue on your own. If DIY repairs are not feasible or successful, contacting the manufacturer or hiring a professional TV repair service is recommended. Taking preventive measures such as avoiding excessive heat exposure, using surge protectors, and handling the TV properly can help prevent such issues in the future. Remember to refer to the user manual and seek professional assistance when necessary for safe and effective repairs.

Why LED TV Half Screen Dark?