AQL Inspection for Wholesale iPhone Screens: Dead Pixel, Bright Pixel, and Scratch Limits

Repair shops that buy wholesale iPhone screens need a consistent way to reject bad panels before they reach customers. AQL sampling gives buyers a statistical acceptance rule for defects like dead pixels, bright pixels, scratches, and backlight spots. This guide adapts AQL for small wholesale batches.

Defect Classifications

Defect Class Typical Limit
Dead pixel Major 0 per panel
Bright pixel Major 0 per panel
Scratch in active area Major 1 under 2 mm
Backlight spot Minor 2 under 1 mm
Frame adhesive gap Minor Under 5 mm total

AQL Sampling for 100-Piece Lots

For a general inspection level II and AQL 1.0, a 100-piece lot needs a sample size of 20. Accept the lot if 0 major defects are found and 1 minor defect is found. Reject if 1 major or 2 minor defects appear.

Inspection Checklist

  1. Power each screen on a test rig and display white, black, red, green, and blue full screens.
  2. Check touch response across the entire digitizer grid.
  3. Inspect flex cables for creases, torn pads, or oxidation.
  4. Verify bracket alignment and ear speaker mesh cleanliness.
  5. Photograph any defects and tag the box with the inspection date.

Where to Source Tested Screens

Documentation

Keep inspection photos for 30 days. If a customer claims a defect, the photo trail proves whether the issue was present at delivery or developed during installation.

Frequently Asked Questions

What is AQL?

Acceptable Quality Limit. It is the worst tolerable defect rate in a sampled batch.

Should I inspect every screen?

For premium orders, yes. For budget lots, use AQL sampling to balance cost and risk.

What tools do I need?

A test rig, magnification loupe, lint-free cloths, and good diffused lighting.

ScrnFix Team supplies wholesale iPhone replacement parts for repair shops and distributors worldwide. Browse our collections for consistent stock, fast shipping, and tested quality grades.