In this video number {1071} SMPS low output, fluctuating, Tik tik sound. I explained how to repair 12 volt, 10 ampere 120 watt switch mode power supply. it was not turning on, and it was providing click sounds. after troubleshooting i detected 1N4744 zener diode, PC817 optocoupler. asfter replacing faulty parts, the power supply started working
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