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Inductors (also called coils or chokes) are passive electronic components that store energy in a magnetic field and filter electrical signals. In television power supply boards, inductors play a key role in the SMPS circuit — filtering output voltages, reducing electrical noise, and regulating energy delivery to downstream components. Common failure modes include open-circuit winding (often caused by overcurrent) or core saturation. A failed inductor in the PSU often causes the TV to fail to start or to output incorrect voltages.
Identification: Inductors are typically cylindrical or toroidal (donut-shaped) components wound with copper wire. Their value is measured in henries (H) or millihenries (mH) and is usually printed or stamped on the component body. Nerokas in Nairobi stocks a range of inductors for electronics repair.
| Inductor Type | Inductance Range | Estimated Price (per unit) |
|---|---|---|
| Axial lead inductor (through-hole) | 1 µH – 100 µH | KSh 20 – 80 |
| Toroidal ferrite core inductor | 10 µH – 10 mH | KSh 50 – 300 |
| SMD power inductor | 1 µH – 220 µH | KSh 30 – 200 |
| Common-mode choke (filter coil) | Various | KSh 100 – 500 |
| Custom wound replacement coil (service) | — | KSh 500 – 2,000 |
Note: Inductors are low-cost components available from electronics component suppliers in Nairobi. As with most passive components, the technician's diagnostic and rework time is the primary cost driver.
