Diagnosis
Your Sansui monitor's flickering and lines are rarely a sign of permanent failure. This is almost always a signal or compatibility issue, not a dead panel. Common culprits are a faulty cable, a refresh rate mismatch, a graphics driver glitch, or an incompatible adaptive sync setting.
How to Fix It
- Replace the Cable: Unplug and firmly reseat the HDMI cable at both ends. If the problem persists, swap it with a known-good, high-speed HDMI cable. A damaged or low-quality cable is the most frequent cause.
- Adjust Refresh Rate: On your PC, go to Display Settings > Advanced Display Settings. Try lowering the refresh rate from its maximum (e.g., 240Hz or 144Hz) to a standard 60Hz to see if the flickering stops.
- Disable Adaptive Sync: Use the buttons on your Sansui monitor to open its OSD menu. Navigate to the gaming or picture settings and locate "FreeSync" or "Adaptive-Sync." Turn this feature OFF.
- Update Graphics Driver: Visit NVIDIA, AMD, or Intel's website to download and install the latest driver for your specific graphics card or integrated GPU. A corrupt or outdated driver often causes display artifacts.
If That Didn't Work
Test the monitor with a different source (like a laptop or game console) using your good HDMI cable. If the problem disappears, the issue is with your original computer's video output. If the flickering remains on all sources, try a factory reset via the monitor's OSD menu. As a last resort before concluding hardware failure, test a different video port on the monitor (like DisplayPort) if available.
Heads Up
Avoid constantly cycling power on/off rapidly during testing, as power surges can stress components. When adjusting settings, change one variable at a time to identify the exact fix.