For your reference, please refer to the following methods:
1. Change background colors: Replace the current background with different solid colors to determine if the issue persists across various displays;
2. Check for display issues: Observe if the spots remain in the same locations, indicating potential display defects;
3. Confirm all cables: Verify that all cables are properly connected and secure;
4. Contact after-sales service: If abnormal display points are identified, contact the after-sales service center for assistance and repair or replacement.