What's going on

Horizontal flickering lines on an ASUS laptop screen usually point to a breakdown in signal communication between your graphics processor and the LCD panel. Laptops transmit data through a thin, multi-pin flex ribbon called an eDP (Embedded DisplayPort) cable. When refresh signals fail to sync, or when individual copper traces inside this cable become pinched or worn down from opening and closing the lid, horizontal artifacts and line flickering are the most common results.

Software conflicts, such as power-saving features like Panel Self-Refresh (PSR) or bad display driver updates, can also cause the screen to stutter horizontally. Identifying whether the issue is rooted in Windows software, the video cable, or the LCD panel itself will save you time and prevent unnecessary parts replacement.

Symptoms people notice

• Thin, razor-sharp horizontal lines that scan up and down the display.
• Thick solid black, white, or magenta horizontal bands across the top or bottom of the screen.
• Flickering that gets distinctly worse when opening, closing, or adjusting the screen angle.
• Horizontal distortion that appears only when running on battery power and stops when plugged in.
• Flickering that stops completely when you switch your display refresh rate down from 144Hz to 60Hz.
• Display distortion inside Windows that disappears entirely on the initial ASUS ROG or ZenBook BIOS boot screen.

Likely causes

1. Graphics Driver Conflicts: Corrupted driver files from Windows Update often disrupt high-refresh-rate displays found on ASUS TUF and ROG laptops.
2. Damaged eDP Video Cable: The ribbon cable running through the laptop hinge wears down over time from friction, causing intermittent short circuits.
3. Failing LCD Panel: Physical micro-fractures in the glass substrate or failing gate drivers inside the screen create permanent horizontal lines.
4. Loose Internal Connections: A dropped laptop can partially unseat the display cable connector on the back of the panel or the motherboard latch.
5. Panel Self-Refresh Bugs: Power-saving software features incorrectly put the display controller into a sleep state while content is actively updating.

Quick checks first

Before taking your laptop apart or purchasing hardware, eliminate software glitches:

• BIOS Test: Restart your laptop and repeatedly tap F2 or Del to enter the BIOS menu. If the horizontal lines are still present in the BIOS, you are dealing with a physical hardware failure (cable, connector, or screen). If the BIOS screen is completely clean, your issue is 100% software or driver-related.
• External Monitor Check: Connect an HDMI cable to a TV. A clean external picture confirms your GPU is healthy, isolating the fault to your laptop's built-in panel or cable.
• Power Options Check: Go to MyASUS or Armoury Crate and disable display battery-saving features to see if the flickering stops.

For broader OS-level screen issues, check our guide on common display problems.

When it's a real repair

If the BIOS screen exhibits horizontal lines, or if moving the screen hinge directly triggers the flickering, software fixes will not resolve the issue. You are facing a hardware repair involving either the video ribbon cable or the display panel.

• Video Cable Replacement: Requires removing the screen bezel and bottom chassis to route a new eDP cable through the hinge mechanism.
• Screen Panel Replacement: If the cable is seated tightly and undamaged, but high refresh rates still trigger horizontal lines, the internal screen matrix has degraded and the entire LCD assembly must be replaced.

DIY vs professional repair

Replacing an ASUS screen panel is a manageable task for most DIYers who take proper safety precautions, such as disconnecting the battery before touching internal connectors. However, replacing an eDP cable can be trickier, as it requires routing fine wires around tight hinge channels and delicate Wi-Fi antennas.

If you prefer taking the DIY route, explore step-by-step disassembly guides at our /guides hub to see what tools and adhesives you need. If opening up your device feels risky or you want expert eyes on a potential motherboard issue, you can send your laptop to mail-in repair specialists via LML Experts or consult community hardware reviews at /reviews.

Next steps

Start by executing the BIOS test and external monitor check to narrow down the fault. If the issue is software, perform a clean reinstall of your GPU drivers using Display Driver Uninstaller (DDU). If you confirm a hardware fault, search for your exact ASUS model number (usually printed on the bottom casing) to source a matching replacement panel or eDP cable.

Need extra troubleshooting advice or help locating correct part numbers? Visit our /community board to get guidance from fellow builders and repair technicians.