{449} SMPS Is Not Working || SMPS Not Turning ON

in this video number {749} SMPS Is Not Working || SMPS Not Turning ON. i explained how to troubleshoot, test and repair KA7500/TL494 based switch mode power supply. this smps controller drives the half bridge topology using D130077 NPN power transistors. i found the power transistors and related components damaged, i replaced it and it started working
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00:00 Introduction
00:35 How to apply power an electronic circuit
01:04 how to measure ac voltage using multimeter
01:25 how to disassemble power supply
02:12 how to test / check fuse using multimeter
02:35 how to test KA7500 / TL494 pwm controller ic in circuit
02:50 How to repair smps step by step
03:25 how to test switching of smps controller ic
03:56 KA7500 TL494 is not starting up