Introduction
Cracked front glass plagues many S21 Ultra owners. This guide shows how to replace just the glass while saving the expensive OLED panel underneath.
When to Replace Only the Glass
✓ Display works perfectly but glass is cracked
✓ Minor surface scratches affecting clarity
✓ Cosmetic damage without touch issues
✓ Cost-saving alternative to full display replacement
Professional Tools Required
- UV curing machine ($150+)
- Precision heating plate
- Thin wire (0.1mm) for separation
- Optical clear adhesive (OCA)
- Dust-free work chamber
Step-by-Step Process
- Remove back glass with 85°C heat
- Disconnect battery and display cables
- Separate glass from display using heating/wire method
- Clean OLED surface with special solution
- Apply new OCA adhesive
- Install new front glass under UV light
Critical Tips
• Maintain 0.3mm adhesive thickness
• Cure for exactly 3 minutes under UV
• Test touch sensitivity before final assembly
• Use frame adhesive for IP68 reseal
Cost Comparison
- Full display assembly: 250−250−350
- Glass-only replacement: 80−80−120
- Professional service: 150−150−200
