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Heat sinks are passive metal components — usually made from aluminium or copper — that absorb and dissipate heat away from power-generating components such as transistors, voltage regulators, and MOSFET switches on the power supply board. Without adequate heat sinking, these components overheat and fail prematurely. In Nairobi's warm climate, effective heat dissipation is especially important for TV longevity. Heat sink failure is usually evident as overheating-related TV shutdowns.
When are heat sinks replaced? Heat sinks themselves rarely fail — more commonly, the thermal interface material (thermal paste or thermal pad) between the heat sink and the component dries out and loses effectiveness. Re-applying fresh thermal paste is a cheap preventive measure.
| Component | Estimated Price |
|---|---|
| Small aluminium heat sink (TO-220 transistor size) | KSh 50 – 200 |
| Medium heat sink (for SMPS MOSFETs) | KSh 150 – 600 |
| Thermal paste (per tube / syringe) | KSh 100 – 500 |
| Thermal pad (sheet, 10 × 10 cm) | KSh 100 – 400 |
| Heat sink compound application (service) | KSh 500 – 1,500 |
| Custom/large heat sink assembly | KSh 500 – 2,000 |
Note: Thermal paste and small heat sinks are available from electronics component dealers in Nairobi including Nerokas and suppliers in River Road. For common transistor packages (TO-220, TO-247), stock heat sinks are readily available.
