- Speaker grille holes: 100% concentric alignment, no blocking to avoid volume reduction;
- Side button holes: 0.05mm tolerance maximum, to ensure smooth pressing without jamming;
- Camera and microphone holes: Precise alignment to avoid image blurring and sound reduction.
- Frame gap: ≤0.08mm around the full screen, no obvious height difference;
- Adhesive overflow: No excess adhesive exposed, keeping clean frame appearance;
- Warping resistance: No edge lifting after 72-hour normal use test.
- Sampling inspection of hole position alignment for each batch of goods;
- Full inspection of frame flatness and adhesive bonding quality before delivery;
- Provide special alignment molds for long-term cooperative repair stores to improve assembly efficiency.