Mobile Phone Assembly, Disassembly and Tools
What this domain tests
Assembly, Disassembly and Tools tests safe opening and reassembly: correct tool for each fastener, heat control on adhesive, flex handling, screw mapping and post-repair testing.
Core rules
- Use the right driver: Phillips, Torx, pentalobe or tri-point. Plastic pry tools and suction cups avoid marring; metal picks can short or scratch.
- Power off, eject SIM/microSD, and discharge static before opening. Heat glued edges to about 60–80 °C, not with an open flame.
- Disconnect the battery flex before unplugging display, camera or charging-board flexes.
- Map screws by length and position; a long screw in a short hole can drive into the board.
- On reassembly, reconnect battery last, test charging, display, touch, cameras, speaker, mic and network before sealing.
Worked example
A phone with a glued rear cover needs a battery replacement. Warm the edges evenly to soften adhesive, insert a thin pick at the seam, and slide it around without diving toward the battery. Lift the cover slowly; if resistance rises, reheat rather than force. Remove the bracket screws into a mapped tray, disconnect the battery first, then the old cell. Fit the new battery, connect it last, power on and test before applying new adhesive. The reasoning: heat reduces adhesive strength, and disconnecting battery first prevents short circuits while other flexes are handled.
Traps
Prying a swollen battery; using a metal blade near the battery; mixing screw lengths; forgetting a grounding screw; sealing the phone before testing; pulling a flex straight instead of lifting its connector.