LG TV UP8000 LINES ON SCREEN General Troubleshooting

T-Con Board

The T-Con board translates the Main Board's video signal into high-speed instructions for the LCD panel's source drivers. Lines on the screen, particularly vertical ones, typically indicate a failure in this timing logic where synchronization data is lost or corrupted. Replacing this board is the primary hardware solution for addressing artifacts that appear across all inputs and the internal menu.

Main Media Board

On many UP8000 models, the timing controller functions are integrated directly into the Main Board SoC. If a 'Picture Test' shows the lines are present even on internal apps, and a T-Con replacement is either not possible or fails, the Main Board's LVDS (Low-Voltage Differential Signaling) output stage is the likely failure point.

8K Ultra High Speed HDMI 2.1 Cable

As highlighted in LG's troubleshooting guide, poor HDMI connections can cause color bleeding and signal interference that mimics screen defects. A cable with insufficient bandwidth or damaged shielding can introduce noise that manifests as flickering lines, especially when processing 4K signals common on the UP8000.