Mobile Screen & Touch Diagnostic Tester (Used / Refurbished)

Self-diagnostic testing tool for refurbished, second-hand, or newly purchased smartphones. Run fullscreen RGB dead pixel cycle, multi-touch touch controller test, live screen FPS counter, and stereo sound channel tests.

Interactive Mobile Screen & Touch Diagnostic Tester (Used / Refurbished)
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Formula & Calculation Methodology

Canvas RGB color rendering + Web Touch API + requestAnimationFrame hardware FPS measurement.

Step-by-Step Worked Example

Device: AMOLED Display | Target: Dead Pixel & 120Hz Refresh Rate

  1. RGB Fullscreen Cycle: Red -> Green -> Blue -> White -> Black
  2. Hardware VSync Sampling: 120 frames per second measured
  3. Multi-Touch Controller: 10 points registered simultaneously
Result: Display Passed: 120Hz Refresh Rate | Zero Dead Pixels

Frequently Asked Questions

How do you identify a dead pixel on a smartphone screen?

Cycle through solid primary colors (Red, Green, Blue, White, Black) in fullscreen. A dead pixel will stand out as a tiny unlit black dot or stuck glowing color that does not change.

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