Screen and Calibration Issues

---

• If no image on the screen
  • check that the video card is good by using an external monitor
• if the graphics adapter is functioning, backlight has failed:
  • should be a very dim image on the display
• Most screens use LED backlights
  • Older laptops might use an inverter component to power a fluorescent backlight

Broken Screen Issues

• impacts on a hard surface from over 1m in height will usually result in cracking or shattering
• if only the glass layer is damaged, the digitizer and display may remain usable
• broken screen is likely to require warranty or professional services to repair it

Digitizer Issues

• if problem with the digitizer
  • touchscreen may not respond
• If you can discount shock + liquid damage, try:
  • Verify that the touchscreen and the user’s fingers are clean and dry
  • If a screen protector is fitted, check that
    • it is securely adhered to the surface
    • there are no bubbles or lifts
  • Check that there is not a transitory software problem by restarting the device
  • use the device in a different location
    • in case electromagnetic interference (EMI) is affecting the operation of the digitizer
  • If the device has just been serviced
    • check that the right wires are still connected in the right places
    • ask “what has changed”

Cursor Drift/Touch Calibration Issues

• if touchpad sensitivity is too high, typing can cause vibrations that move the cursor
• unresponsive or inaccurate touch input
  • can be an indication of:
    • resources being inadequate (too many open apps)
    • badly written apps that hog memory or other resources
  • soft reset will usually fix the problem in the short term
  • if persistent:
    • identify whether the problem is linked to running a particular app
    • try freeing space by removing data or apps
    • try re-calibration utilities if available by vendor
    • otherwise, need warranty repair