22/11/2025
Phone Repair Advice for Technicians
1. Diagnostics First
Interview the customer: Ask about symptoms, recent drops, water exposure, charging habits, and previous repairs.
Run a complete functional test: Display, touch, cameras, sensors (proximity, ambient light), speakers, mic, vibration, buttons, wireless connectivity.
Check for board-level problems early: Rapid battery drain, random restarts, and “no touch” issues can point to PMIC/CPU-related faults rather than simple part issues.
2. disassembly Best Practices
Don’t rush heat application: Use controlled heat (70–85°C for back glass, 60–70°C for screens) to avoid OLED burn or frame warping.
Track all screws: Mix-ups can cause long-screw damage—especially to iPhones near motherboard standoffs.
Always disconnect the battery first before removing displays or other flex cables.
When lifting a display, open it in the safe direction (varies by model).
3. Handling Flex Cables & Connectors
Never force a connector—misalignment damages pins.
If a cable is too tight after installation, reroute it properly, don’t “stretch” it.
Inspect connectors under magnification for bent pins whenever a part doesn't work.
After reconnecting, test before sealing.
4. Battery Replacement Safety
NEVER pry under batteries with metal tools.
If pull tabs tear, apply low heat and patience before lifting the cell.
Check for swelling and isolate swelling batteries immediately.
Dispose of batteries according to local environmental regulations.
5. Water Damage Protocol
Do not power the device until inspected.
Open immediately, remove battery if possible, clean with 99% isopropyl alcohol.
Corrosion near PMIC, charging IC, and connectors often indicates board-level needs.
Document everything—water-damaged phones often have intermittent future issues.
6. Soldering / Microsoldering Tips (Advanced Techs)
Use correct flux and temperature profiles for leaded and unleaded solder.
Always preheat boards to reduce stress and avoid pad lifting.
Test related circuits before removing an IC to verify the fault (e.g., shorts, missing voltage rails).
Avoid excessive pressure on pads—lifting pads is worse than a failed repair.
7. Reassembly & Quality Control
Replace adhesive properly—weak seals cause dust inside cameras and poor water resistance.
Clean sensors and lenses with lint-free cloths.
Run a post-repair full diagnostic, including:
Face ID / Touch ID
Wireless charging
Signal strength
All buttons & haptics
Document the repair for shop records.
8. Customer Communication
Explain risks of aftermarket parts clearly.
For repairs with long-term uncertainty (liquid damage, board-level), set expectations.
Offer preventative guidance—good cases, battery care, and avoiding cheap chargers.
9. Clean Workspace & ESD Safety
Use grounded mats, bracelets, and anti-static storage.
Keep screws, adhesives, and tools organized to avoid mistakes.
Clean your workspace daily—dust causes problems, especially with the cameras.
