How to Fix LG LED UP7000 Series Horizontal Lines and Screen Flickering

Quick Diagnosis

Horizontal lines and flickering are typically caused by loose or dirty Flexible Flat Cables (FFC) connecting the T-Con board to the LCD panel, or localized gate driver failures. Physical stress or heat can warp these connections, leading to unstable signal transmission.

Technical diagnostic blueprint diagram for the LG LED UP7000 Series showing symptoms of Horizontal Lines and Screen Flickering.

Step-by-Step Resolution

  1. 1

    Unplug the TV from the wall socket and disconnect all HDMI cables from the back of the device.

  2. 2

    Perform a power cycle by holding down the physical power button under the LG logo for 30 seconds.

  3. 3

    Inspect the HDMI cables for bent pins, fraying, or visible damage, and clean the TV's HDMI ports using a can of compressed air.

  4. 4

    Gently press along the edges of the TV bezel near where the lines appear to see if the flickering changes, indicating a loose panel connection.

  5. 5

    Plug the TV back into the wall, reconnect one HDMI device with a new cable, and check if the flickering is resolved.

Alternative Causes & Edge Cases

  • Can occur on LG Nano75 models due to electrical interference from nearby routers, speakers, or high-power electronics.
  • Applies to select Sony Bravia models where screen flickering is triggered by a failing T-Con board processor.