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Provider: Pro-Logic Technologies, Kangari Building, Nairobi
The magnetometer is the sensor that detects magnetic field strength and direction, enabling the phone to function as a digital compass. It is the hardware foundation for the compass app, the directional arrow in maps and navigation applications, and augmented reality features that require the phone to know which direction it is pointing. On virtually all modern smartphones the magnetometer is a MEMS chip — typically a Hall-effect or AMR (Anisotropic Magnetoresistance) sensor — soldered to the motherboard, sometimes integrated into the same IMU package as the accelerometer and gyroscope.
Symptoms of Magnetometer Failure
- Compass app displays incorrect or wildly spinning readings regardless of orientation
- Google Maps and Apple Maps navigation arrow points in the wrong direction and does not correct
- AR applications that require directional awareness malfunction
- "Calibrate compass" prompts appear repeatedly and calibration never succeeds
- Sensor diagnostic apps report the magnetometer as absent or reading zero across all axes
Magnetometer readings are highly sensitive to environmental interference. Before concluding a hardware fault, move away from metal surfaces, electronics, and magnetic accessories and retest. Many apparent magnetometer failures are actually calibration issues resolved by performing the figure-eight calibration gesture in an open space.
Estimated Magnetometer Repair Costs in Nairobi (2024–2025)
| Device Category | Labour (KES) | Parts (KES) | Total Estimate (KES) |
|---|---|---|---|
| Budget Android — standalone magnetometer chip | 2,500 – 5,000 | 600 – 2,000 | 3,100 – 7,000 |
| Mid-range Android | 3,000 – 6,000 | 1,000 – 3,000 | 4,000 – 9,000 |
| Samsung Galaxy A/S-series | 3,500 – 7,500 | 1,200 – 3,500 | 4,700 – 11,000 |
| iPhone (all models — magnetometer chip) | 4,000 – 8,000 | 1,200 – 3,500 | 5,200 – 11,500 |
| Google Pixel series | 3,500 – 7,500 | 1,200 – 3,500 | 4,700 – 11,000 |
Magnetometer chips are small LCC or BGA components requiring micro-soldering. Post-replacement calibration in a magnetically neutral environment is essential before the device is returned.
Magnetic Accessories and Interference
Cases with built-in magnets, third-party wireless charging pads, and card holders attached to phones can permanently demagnetise or confuse the magnetometer over time. If the sensor failure coincides with the use of such accessories, their removal and a calibration attempt should precede any hardware repair.
Pro-Logic Technologies at Kangari Building, Nairobi diagnoses magnetometer faults through calibration testing before recommending board-level chip replacement.
