there's a weird scan line effect that flashes across the screen, mostly in menus or certain game colors.

Diagnosis

This phenomenon is commonly referred to as "inverse ghosting" or the "corduroy effect." On the Samsung Odyssey G7 32-inch, it manifests as a series of horizontal scan lines or a shimmering "zebra" pattern that appears specifically during transitions between dark and light colors, such as when scrolling through a menu or during high-contrast movement in games. The root cause is aggressive "overdrive" applied to the VA panel. To achieve a 240Hz refresh rate and low GtG (Gray-to-Gray) response times, the monitor applies a higher-than-necessary voltage to the pixels to force them to change state faster. When the voltage exceeds what is required for the specific color transition, the pixel "overshoots" its target color, creating a momentary artifact that looks like a flashing line or a trailing shadow. This is most visible in the G7's high-curvature panel when the Response Time is set to the most aggressive levels.

How to Fix It

To eliminate these artifacts, you must reduce the overdrive voltage by adjusting the Response Time setting in the On-Screen Display (OSD).

1. Press the JOG button (the small joystick located under the center of the monitor bezel) to open the OSD menu.
2. Navigate to the Game menu category.
3. Select Response Time. You will see options: Standard, Fast, and Fastest.
4. Change the setting from 'Fastest' or 'Fast' to Standard.
5. Exit the menu and test the screen in a high-contrast environment (such as a white window on a black background) to confirm the scan lines have vanished.
6. If you still experience slight shimmering but want more speed than 'Standard', try 'Fast', but avoid 'Fastest' at all costs as it is the primary cause of this specific artifact.

If That Didn't Work

• Adjust Black Equalizer: Go to Game > Black Equalizer. If this is set too high (above 13), it can artificially boost shadow detail, making the overdrive artifacts more prominent in dark areas. Lower this value to 10 or 12 to stabilize the image contrast.
• Toggle Adaptive Sync: In the OSD, go to Game > Adaptive-Sync. If this is 'On', try toggling it 'Off' to see if the scan lines persist. If they disappear, the issue may be a synchronization mismatch between your GPU's output and the monitor's variable refresh rate range.
• Lower the Refresh Rate: Open your NVIDIA Control Panel or AMD Radeon Software and drop the refresh rate from 240Hz to 144Hz. If the lines disappear, it indicates the panel is struggling with the voltage requirements at peak frequency, suggesting a potential hardware limitation of that specific unit's panel lottery.
• Switch Input Cables: Ensure you are using a certified DisplayPort 1.4 cable. A low-quality cable can introduce signal noise that mimics scan lines, especially when pushing high bandwidth for 1440p at 240Hz. Replace the stock cable with a VESA-certified braided DP cable.

Heads Up

• Firmware Updates: The G7 is notorious for panel issues that can be fixed via firmware. Check your current version in the System menu and use the USB service port to update to the latest version to improve panel stability.
• Heat Management: The G7 runs hot due to the high-density backlight. Ensure there is at least 4 inches of clearance behind the monitor; overheating can occasionally exacerbate pixel overshoot.
• Avoid 'Fastest' Setting: In professional testing, the 'Fastest' setting consistently produces overshoot artifacts across almost all G7 units. It is generally recommended to leave the monitor on 'Standard' or 'Fast' for the most natural image.