Go here 1:00:00 - to bypass theory and get into practical troubleshooting a board
For detailed practical on SMPS, go herer    • #192 How to repair Computer Power Sup...  
in this video i explained and demonstrated
1. the basics functions of spms switching mode power supply
2. PWM pulse width modulator using different types of smps switch mode power supplies.
3, i explained in detail the circuit description with smps pwm concept
4. PWM pulse with modulator ideas
5. circiuit diagram of SMOS
6 how does a switching mode power supply works
7. smps tutorial with repair
8 detailed troubleshooting repairing or understanding repair switching mode power supply basics
9 working principle of SMPS
10 SMPS diagram
11 switch mode power supply repair
this technology is applicable for tv power supply, computer PC power supply at and atx power supplies, led lcd power supplies, lcd backlight power supply circuit, smart battery chargers, Electronics rectifier units and solid state welding plant repair.
you can follow my tips when power supply have no output voltage or high voltage or output voltage have fluctuations. fluctuating voltage lead us to feed back circuit that is a optopcoupler and voltage reference.

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Haseeb electronics Chowk Azam