For your reference, please refer to the following methods:
1. Replace the current background with different solid colors to determine if the issue persists across various displays;
2. Observe if the spots remain in the same locations, indicating potential display defects;
3. Ensure that all cables, including HDMI, DisplayPort, or power cables, are properly connected and secure. Sometimes, a loose connection or a faulty cable can cause visual issues like flickering, artifacts, or unexpected spots on the screen;
4. If abnormal display points are identified, contact the after-sales service center for assistance and repair or replacement.