A customer finds that their phone’s touch screen is not responsive. Which of the following could be the reason?

  1. Degraded battery
  2. Backlight failure
  3. Stuck keys
  4. Digitizer failure 

Answer: D – The Digitizer is a component on the device that takes the analog input (say, user’s fingers or stylus pen) and converts the input signal into a digital format.

Backlight Failure is one reason for dim screen display on a mobile device. Stuck keys and degraded battery are not failures that concern unresponsive touch screen.

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