220-1101 Mobile Devices Practice Question

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✗

  Replace only the digitizer

  Why it's wrong here

  Replacing only the digitizer is impractical in modern iPhones because the digitizer, LCD, and glass are laminated together into a single bonded unit. Separating the digitizer from the LCD requires industrial tools such as a laser separator or heated wire and exposes the display to a high risk of cracking or producing air bubbles. Apple and reputable repair shops do not offer digitizer-only replacement; they replace the entire screen assembly to ensure the display and touch layers remain aligned and functional.

• ✓

  Replace the complete screen assembly

  Why this is correct

  Replacing the complete screen assembly is the standard and recommended repair for a cracked iPhone screen that also shows a dead touch zone. The assembly contains the LCD (or OLED), the digitizer, the cover glass, and often the front sensor bracket, all of which are fused together with optical adhesive. Installing a new assembly restores both display clarity and multi-touch responsiveness, and also preserves the phone's structural rigidity and water resistance. This is the only method that guarantees a reliable, warranty-backed fix for a cracked screen.

• ✗

  Replace only the LCD

  Why it's wrong here

  Replacing only the LCD does not address the actual failure: the LCD is producing an image, but the digitizer is broken because the screen is unresponsive to touch in the cracked area. The digitizer is the touch-sensing layer, and it resides on the inner surface of the cover glass or within the laminated stack, separate from the LCD. Attempting to swap the LCD would also require separating the laminated layers, which is not a feasible field repair. Since the damage is to the touch layer, the LCD replacement would leave the touch fault unchanged and waste money and effort.

• ✗

  Apply a tempered glass screen protector

  Why it's wrong here

  Applying a tempered glass screen protector is a preventative measure, not a corrective one. It adheres to the surface of the existing glass, so it cannot repair a crack that has already propagated into the digitizer, nor can it reestablish the electrical connections that carry touch input. While a protector might keep broken glass shards in place and prevent the crack from worsening, it does nothing to restore the phone's ability to register touches in the dead zone. The only way to recover touch functionality is to replace the damaged digitizer, which in practice means replacing the entire screen assembly.

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