in this video number {1002A} SMPS not working ||SMPS has no output voltage|| SMPS not powering on || SMPS Not Turning ON. i explained how to troubleshoot, test and repair UC3842 current mode smps controller ic based switch mode power supply circuit to provide 12 Volt 5 ampere in flyback topology. this 3842 ic belongs to a complete family of KA3842, KA2842, KA1842, UC3842, UC2842, UC1842, TL3842, MIC38HC42, UC3843, KA3843, TL3843, MIC38HC43, UC3844, KA3844, TL3844, MIC38HC44, UC3845, KA3845, TL3845, MIC38HC45, all the above mentioned ics have approximately similar circuits. i found the smps controller, vcc capacitor, vcc rectifier, and 2x zener rectifiers, and one SCR in protection circuit.
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00:00 12v 5 ampere SMPS has no output volatge
00:55 how to test troubleshoot and repair smps power supply
04:03 vcc capacitor is not charging at full voltage