XT802C / XT802D / XT802E / XT802F

1. Basic Inspection & Quick Fixes

• Check if the screen is dirty, oily, or has water stains.

  Clean with a soft dry cloth; do not use corrosive liquid.

• Remove any protective film that is bubbled, damaged, or too thick.

• Ensure your fingers are dry; wet or greasy fingers reduce sensitivity.

• Restart the device completely and check if touch returns to normal.

2. System & Calibration Solutions

• Enter system settings → display → touch screen calibration.

  Follow on-screen instructions to complete calibration.

• Close background apps that may cause system lag or insufficient memory.

• If running on Android, check for system OTA updates and upgrade to the latest version.

• Restore the device to factory default settings (back up data first) to rule out software conflicts.

3. Environmental & Installation Factors

• Avoid strong static electricity, high humidity, or direct strong light on the screen.

• Ensure the device is firmly installed without bending or deformation,

  which may cause poor touch response.

• Keep away from strong electromagnetic interference sources.

4. Hardware Fault Judgement

• If the touch panel is cracked, scratched, or partially unresponsive,

  the touch screen digitizer may be damaged.

• If all calibration and system steps fail, the touch module or hardware is faulty.

  Contact XTIOT sales or after-sales support for repair or replacement.

5. After-Sales Support

• Device model (XT802C / D / E / F)

• Failure symptom

• Purchase information