iPhone 13 Screen Issue: Horizontal Multi-Coloured Lines

I recently experienced a sudden display issue with my iPhone 13 — horizontal, multi-coloured lines appeared across the entire screen, making it difficult to read or use. The issue began without any prior software updates or physical damage. Before this, I had occasionally noticed brief screen flashing at night, but I initially assumed it was a notification.

After attempting a hard reset as recommended by Apple Support, the problem persisted. I then took the device to an Apple Authorized Service Provider, where diagnostics suggested a potential display assembly fault.

While looking into this further, I found multiple discussions from other users reporting similar display problems:

• Horizontal rainbow lines in iphone 13 - Apple Community
• rainbow screen on iphone 13 - Apple Community
• iphone 13 - The screen showing horizontal… - Apple Community
• Sudden rainbow screen on iPhone 13 mini a… - Apple Community
• Why does my iPhone 13 mini have verticle … - Apple Community
• Flickering screen issue on iPhone 13. - Apple Community
• Display issues with recent upgrade to ios… - Apple Community
• iPhone 13 Mini display issue - Horizontal… - Apple Community
• Rainbow lines - Apple Community

Since these discussions are now closed, I wanted to continue gathering insights. Has anyone found a reliable explanation or workaround for this issue? Could this be related to software, or is it typically a hardware-related fault?

Would appreciate any technical insights or troubleshooting recommendations from those who have encountered something similar.