L4 Technician – Mobile Repairing Steps (Android & Apple)
1. Job Card Verification
Review customer complaint carefully.
Check device history (previous repairs, water damage, physical damage).
Confirm warranty / out-of-warranty status.
Note visible defects before opening the device.
2. Initial Diagnosis - Perform basic functional check:
o Power ON/OFF / Display / Charging / Network / Camera / Touch
Identify whether the issue is software or hardware.
Golden Rule: Never open the phone before basic testing unless it is completely dead.
3. Visual Inspection
o Check for -Liquid damage indicators / Burn marks / Corrosion / Broken
connectors / Loose components
Use a microscope for motherboard inspection when required.
4. Power Testing (For Dead Phones) - Connect to DC Power Supply.
Possible Observations:
No current draw: Battery / charging IC / power IC issue.
High current / short: Locate shorted capacitor or IC.
Boot current but no display: Check display line or backlight circuit.
5. Disassembly with ESD Protection
Wear an ESD wrist strap / Use an anti-static mat. / Remove components
systematically to avoid flex damage.
⚠Especially important for iPhones (Face ID, Touch ID, True Tone components).
6. Advanced Motherboard Diagnosis
Follow a structured approach:
✔ Check Power Rails - Measure voltages using schematics (if available).
✔ Identify Short Circuits - Use multimeter / thermal camera / freeze spray.
✔ Inspect Common Failure Areas - Power IC / Charging IC / Baseband section / Audio IC /
Backlight circuit
7. Micro-Soldering / Board-Level Repair
Perform only after confirming the fault.
Steps:
1. Shield nearby components with heat-resistant tape.
2. Apply flux.
3. Use controlled temperature (typically 320–380°C).
4. Remove faulty component.
5. Clean pads.
6. Reball or replace IC.
7. Inspect solder joints under microscope.
8. Apple-Specific Precautions
Preserve original paired parts (Face ID, Touch ID).
Avoid flex damage.
Maintain battery health data where applicable.
Restore True Tone after display replacement.
Use programmer tools when required.
9. Android-Specific Steps
Flash firmware if software-related.
Repair IMEI/baseband issues carefully.
Calibrate fingerprint sensors after replacement.
Verify fast charging protocols.
10. Cleaning & Reassembly
Clean board with Isopropyl Alcohol (IPA) after soldering.
Replace thermal pads if removed.
Ensure proper screw placement.
Reassemble dust-free.
11. Quality Testing (Mandatory)
Never skip QC.
✔ Network signal / Wi-Fi & Bluetooth / Camera / Sensors / Audio / Charging / Battery drain
/ Heating test
Run the device for 15–30 minutes when possible.
12. Final Quality Check
Ask yourself:
Is the original complaint resolved?
Did I create any new issue?
Is the device cosmetically safe?
Use a QC checklist for consistency.
L4 Technician Best Practices
Avoid trial-and-error repairs.
Always diagnose before replacing parts.
Focus on first-time-right repair.
Support junior technicians when needed.
Balance repair cost vs device value.
Pay: ₹20,000.00 - ₹60,000.00 per month
Benefits:
- Health insurance
- Leave encashment
- Paid sick time
- Paid time off
- Provident Fund
Application Question(s):
- What is your current take home salary?
- What is your Notice period?
- Which location you are from?
Work Location: In person
