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LG 55LF6000 Flickering Screen [Quick Fixes]

LG 55LF6000 Flickering Screen

Flickering refers to a disruption in the regular cyclic refresh rate or brightness of video display devices that is perceptible to the human eye.

It is a phenomenon that can manifest on various video display devices, including monitors, televisions, and laptops.

Significantly, in comparison to other esteemed LG models like LG OLED65C2PUA, LG OLED55B2PUA, and LG OLED55CXPUA, the LG 55LF6000 garners greater attention and more extensive discussions concerning flickering on various technical forums.

These might be the reasons LG 55LF6000 Flickering Screen:

  1. Defective backlights (Replace them all with new ones)
  2. Bad LED or a bad LED strip connection
  3. Outdated Firmware (can be updated online)
  4. Slow screen refresh rate (solved by selecting a higher refresh rate in the display settings)
  5. A loose power cable (solved by securing it properly in the ports)
  6. Multiple power cables fitted in a single power extension
  7. A worn-out display cable such as VGA, HDMI, DVI, or DP (Buy a new one)
  8. Loose or poorly fitted display cables
  9. Damage power supply inside the Screen (needs replacement by taking it to a lab)

Before attempting any troubleshooting steps, it is a good idea to reset your LG Screen as it may help resolve the flickering issue. Here’s how you can do it: First, unplug your Screen from the power source and wait for a full 60 seconds. While the Screen is unplugged, press and hold the power button for about 30 seconds. After the 60 seconds are up, plug your LG LED back in and turn it on. By performing this reset, you are giving your Screen a fresh start, which might stop the flickering problem.

Now that we know what causes the flicker, let’s fix them.

Fix 1: Replacing Defective backlights

Removing the backlighting from an LCD screen is a complex task requiring extreme caution, as a small mistake can permanently damage the entire screen.

Therefore, I strongly advise against attempting it unless you have the necessary expertise and confidence.

However, if you still want to proceed, here are the steps to follow:

Step 1: Unscrew the cover of the Screen.

Step 2: Carefully separate the LED panel from the body.

Step 3: Remove any sticky tape and foil from the back of the screen.

Step 4: Take great care in removing the tape from the backlight cables.

Step 5: Identity and cautiously remove the circuit board. Be aware that it may be glued or screwed to the panel, and avoid bending or flexing it.

Step 6: Place the LCD screen upright and unscrew the metal case once the circuit board is safely removed. Use a credit card or something similar to unlatch it from all sides. The metal frame holds the LCD to the plastic frame, which was removed in Step 1.

Step 7: You will see layers and LED backlights with the metal frame removed. Carefully unplug each layer and remove them. Step 8: Replace any defective backlight strips with new ones.

Step 9: Check if the LEDs are working before completing the process. Connect the wires to the LCD screen carefully, and then turn on the power to test them.

Fix 2: Securing bad LED strip connection

A loose LED strip connection might cause your LG Screen to flicker. Therefore securing the strip properly in place is important.

  1. Begin by placing the LED facedown on a flat surface.
  2. Unscrew the LED cover from the back to access the internal components.
  3. Once the cover is removed, you will notice several PCB (Printed Circuit Board) boards.
  4. Carefully examine these PCB boards to identify any loose strips or connections.
  5. If you find a loose strip or connection, reattach and secure it firmly.
  6. After securing the strip, turn on the Screen to determine if the flickering issue has been resolved.

Additionally, it’s worth noting that dust particles can sometimes cause poor connections between the LED strips. To address this, you can use a toothbrush and isopropyl alcohol to clean the affected areas, eliminating potential connection problems.

Fix 3: Updating Firmware

An outdated Firmware can also cause your LG monitor to flicker. Thankfully most of the time, it automatically updates itself. However, sometimes you may need to click on auto-update.

To check for automatic updates on your LG LED, follow these simple steps:

  1. Press the Home/Start button on your LED remote.
  2. Look for the Settings option and select it.
  3. Choose the All Settings menu.
  4. From there, navigate to the General section.
  5. Scroll down until you find the option labelled “About this.”
  6. Make sure that the checkbox next to “Automatic updates” is checked. This ensures that your Monitor will receive updates automatically.

However, you can update Firmware manually by following these steps:

  1. Locate the appropriate Product Support Page for your LED.
  2. Visit the LG Support Home Page.
  3. Enter and select your Screen model number.
  4. Download and extract the firmware file by right-clicking and selecting “Extract All.”
  5. Copy the extracted file onto a USB drive.
  6. Create a folder named “LG_DTV” on the root directory of the USB drive.
  7. Move the extracted file into the “LG_DTV” folder. Ensure that the file has the EPK file extension.
  8. Insert the USB drive into the USB port on the back of your LED.
  9. Follow the on-screen instructions provided by the LED to initiate the firmware update process.

Fix 4: Increase the Refresh Rate

The phenomenon of flickering in LED screens is a continuous occurrence, but our eyes are unable to perceive it when the refresh rate is high. This is evident when attempting to capture an image of the screen with a camera, resulting in the appearance of moving black lines.

The refresh rate of a LED Screen refers to the frequency at which the LEDs are updated per second. A Screen that functions properly refreshes itself at a faster rate, rendering the flickering imperceptible.

Increasing the refresh rate of your Screen could potentially resolve the issue. Here are the steps to do so,

Step 1: Right-click on your desktop and select Display Settings

Step 2: Scroll Down to the end and select Advanced Display Settings

Step 3: Select Refresh Rate and Select a higher refresh rate (however, it is limited by the model of your monitor; some have a higher refresh rate up to 120 Hz while others are limited to 60 Hz).

Alternatively you can also change refresh rate in LED Screen Setting. All you need is to go to Settings>Modes>Gaming. Your refresh rate will automatically increase.

Fix 5: Fix Power Supply Issues

Similar to LED screens, electricity operates in cycles. In the United States, the standard frequency is 60 Hz per second, carefully regulated to ensure smooth operation of appliances.

To address flickering issues, it is important to inspect the power cable. Check if it is securely connected and free from damage or wear on its female end.

A loose or damaged power cable may fail to deliver the necessary electrical current cycles, resulting in flickering.

If the power cable is functioning properly, it is advisable to examine your main electricity board. This board typically includes a meter that displays the frequency of the electricity.

If such a meter is not present, you can consider purchasing a frequency meter to measure the frequency of your electricity.

Furthermore, it is crucial to note that having multiple devices plugged into the same power outlet can contribute to monitor flickering.

This is due to the electrical flux generated by other devices, which can distort the refresh rate frequency of your monitor.

To resolve this issue, unplug other devices from the power outlet and ensure they are connected to separate extensions located at a reasonable distance from your LED Screen.

This helps minimize the impact of electrical flux and maintains the desired refresh rate frequency for optimal performance.

Fix 6: Examine Input Cables and Ports

Flickering on your LG screen can be caused by the HDMI, DisplayPort (DP), VGA, DVI, or display cable being used.

To address this issue:

  1. First, visually inspect the display cables and their ports for any visible damage.
  2. Check both ends of the cable and ensure the pins are not damaged. Make sure they are securely connected.
  3. If the flickering continues, try using a different cable and port combination. For example, you can switch from a VGA cable to an HDMI cable and connect it to a different port on your LG screen.


Resolving flickering issues on your LG LED screen requires a systematic approach. By considering factors such as defective backlights, loose connections, outdated firmware, refresh rate adjustments, power supply issues, and cable inspections, you can troubleshoot and potentially eliminate the flickering problem.

Remember to exercise caution when attempting any repairs and seek professional assistance if necessary. With these steps, you can enjoy a smooth and uninterrupted viewing experience on your LG screen.

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