A rhythmic clicking sound or a totally unresponsive television points directly to the power regulation stage. Here is how technicians diagnose and fix SMPS units.
The Power Heart: How Switched-Mode Power Supplies Work
Your television connects to 230V AC mains electricity from Bangalore's power grid, but internal microchips require precise DC voltages: - +3.3V or +5V Standby: Keeps the infrared remote sensor and standby controller awake. - +12V: Powers the audio amplifier and motherboard logic. - +24V to +120V: Powers the LED backlight array.
The Switched-Mode Power Supply (SMPS) board regulates these voltages with millivolt accuracy.
What Causes the Repetitive Clicking Sound?
When you press the power button on your remote, the TV's processor energizes an internal mechanical relay or solid-state switch to send high-voltage power to the main rails.
If a short circuit exists on the secondary side—such as a shorted power MOSFET, blown Schottky diode, or bulging filter capacitor—the SMPS's over-current protection circuit instantly triggers an emergency shutdown. The TV resets and attempts to power on again, resulting in the continuous "click... pause... click" loop.
Safe Bench Diagnosis
Attempting DIY repairs on SMPS boards is hazardous because large 450V electrolytic capacitors can retain dangerous electrical charges for hours after being unplugged.
Our senior technicians discharge all filter capacitors safely, verify transformer windings, test pulse-width modulation (PWM) regulator ICs, and restore clean, ripple-free DC power rails.
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