DeviceTriage
Troubleshooting guide

Touchscreen not responding in some areas

Check repeatable missed regions, interrupted gestures, protectors, moisture, software overlays, and possible digitizer faults.

Run touchscreen test

Common symptoms

  • Touches fail near one edge or in one fixed region
  • Scrolling or drawing stops partway through a gesture
  • One finger works but multi-touch gestures do not

Possible causes

  • Moisture, dirt, glove mode, or a damaged screen protector
  • App overlay, accessibility feature, palm rejection, or edge-gesture policy
  • Operating-system or touch-controller problem
  • Impact, liquid damage, loose cable, or digitizer failure

How to diagnose it

  1. Run the Touchscreen Test and sweep the exact affected region
  2. Rotate the device and repeat to see whether the symptom follows the physical screen
  3. Compare a built-in notes, drawing, or diagnostic app
  4. Clean and dry safely; remove only a removable protector for comparison

Solutions to try

  1. Restart the affected app and then the device if the symptom spans apps
  2. Temporarily compare without a recent overlay or accessibility gesture
  3. Update the operating system and device firmware from official sources
  4. Stop using a swollen, cracked, overheated, or liquid-damaged device and seek service
  5. Use repair diagnostics if the same physical zone fails across native apps

The first 10-minute diagnosis

  1. Sweep the affected region in the Touchscreen Test with one clean, dry finger.
  2. Rotate the device and repeat to see whether the symptom follows the physical glass.
  3. Compare a native notes or drawing app and the lock screen where safe.
  4. Inspect for moisture, cracks, lifting, heat, swelling, and a damaged protector.

Decision path by result

One physical zone always failsConfirm across native apps; a protector, connector, or digitizer region is more likely than one website.
The fault rotates with the app layoutInspect the app, overlay, edge gesture, or accessibility control.
Only multi-touch failsCompare browser reporting, device specification, gesture settings, and a native multi-touch app.
Touch changes while chargingStop using suspect chargers or cables and compare an approved power source.

Platform-specific checks

Windows touch devices

Review touch calibration, HID device status, optional updates, and whether the problem appears before sign-in.

iPhone and iPad

Remove moisture, compare without an easily removable protector or accessory, and use official service diagnostics for persistent zones.

Android

Compare safe mode where supported, gesture navigation, glove mode, screen-protector sensitivity, and manufacturer diagnostics.

What not to do first

  • Do not press hard on a cracked, swollen, or lifting screen.
  • Do not use liquid inside ports or screen gaps.
  • Do not factory-reset before confirming whether the symptom is physical and backing up data.

When to move beyond a browser test

  • Stop using the device if the battery or display assembly is swollen, hot, lifting, or damaged.
  • Seek repair when the same physical zone fails across native apps after safe cleaning and restart.

Last technical review: 2026-09-03

Frequently asked questions

Does maxTouchPoints prove how many fingers the panel supports?

No. It is a browser-reported capability hint. Confirm simultaneous touch behavior directly and compare the device specification.

Can this page repair a dead touch zone?

No. It helps reproduce and locate the symptom. A persistent physical region that fails across native apps may require service.