220-1101 Question 1
Single answer1.1 Given a scenario, monitor mobile device hardware and use appropriate replacement techniques.A user drops a smartphone, and the display glass is cracked. The image still appears normally, and the touch functionality works across the entire screen. The manufacturer’s service manual for this model states that the front glass is fused to the digitizer and OLED panel as a single factory-sealed assembly. The company wants the most reliable repair with the lowest risk of damaging the phone further. What should the technician do?
- A
Replace only the outer glass using a heat gun and adhesive strips
- B
Replace the complete display assembly according to the manufacturer’s procedure
- C
Recalibrate the digitizer and apply a screen protector over the crack
- D
Replace the battery first, because impact damage commonly causes display cracks
Show answer and explanation
Correct answer: B
Explanation
This question tests mobile device hardware replacement techniques under A+ Core 1 objective 1.1. In real service work, technicians should follow the manufacturer’s documentation for device disassembly and part replacement. On many modern smartphones, the cover glass, digitizer, and display panel are laminated or sold as one service part. In those cases, replacing the entire display assembly is the recommended and most reliable repair, especially when the organization wants to avoid additional damage. Best practices also include using the vendor’s service manual, approved tools, ESD precautions, proper adhesive/seal replacement, and post-repair functional checks such as display quality, touch response, and front-facing sensor/camera alignment.
- A. Incorrect.
Incorrect. Although third-party glass-only repairs exist for some phones, this option conflicts with the scenario because the manufacturer specifies that the glass, digitizer, and OLED are fused into one assembly. Attempting to separate laminated layers increases the chance of damaging the OLED, touch layer, frame, or seals. This is not the most reliable or lowest-risk repair.
- B. Correct.
Correct. When the manufacturer documents the screen components as a single sealed assembly, best practice is to replace the entire display assembly using the approved procedure. This matches the scenario’s requirement for the most reliable repair and minimizes the risk of additional damage to the display, touch layer, and device sealing components.
- C. Incorrect.
Incorrect. Recalibration does not fix physically cracked glass, and a screen protector is only cosmetic mitigation, not a hardware repair. Since the phone has physical damage and the company wants a proper replacement technique, this does not address the failed component.
- D. Incorrect.
Incorrect. A battery replacement is unrelated to a cracked front glass/display assembly unless there are separate symptoms indicating battery failure. This distractor reflects a common mistake of replacing unrelated parts after a drop instead of diagnosing the specific damaged assembly.