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Mobile Touchscreen Grid & Dead Zone Tester

Interactive touch grid matrix to find unresponsive dead zones on phones or tablets. Renders an interactive touch-sensitive grid matrix that lights up green upon physical finger contact, exposing unresponsive display zones.

Touchscreen Grid Coverage Lab

0% Covered

Swipe or draw across every tile on the grid below. Touched tiles will illuminate green. Untouched tiles expose unresponsive digitizer dead zones.

How to use this test

  1. Drag finger across entire screen surface.
  2. Cover corners, edges, and center grid squares.
  3. Ensure every grid cell illuminates green.
  4. Check for broken lines or missed blocks indicating digitizer dead zones.

How to understand your result

Looks good: 100% of grid cells responded to touch without gaps.
Issue observed: Specific columns or rows failed to register touch (digitizer failure).

Troubleshooting: what to try next

  • Remove thick screen protectors that may insulate capacitive sensors.
  • Ensure screen is free of water drops which cause phantom touches.

What this test cannot tell you

Cannot diagnose hardware touch controller bus errors directly.

Frequently Asked Questions

EP
Tested & Reviewed by [REAL AUTHOR NAME - OWNER TO COMPLETE]
Last Reviewed: 2026-10-17 • Test Method: pointermove and touchmove dynamic grid collision detection • How We Test