Part I
Introduction to SMPS
1. Introduction to Switch Mode Power Supplies (SMPS 9
2. Identifying Electronic Components in Different Types of SMPS with the Help of Photos 14
3. Block Diagram of a Typical SMPS and How It Works 18
4. Easy Way To Understand The 11 Circuit Functions of SMPS With The Help Of Schematic Diagrams 24
4.1-Input Protection and EMI Filtering Circuit 26
4.2-Bridge Circuit 27
4.3-Start Up and Run DC Circuit 29
4.4-Oscillator Circuit 31
4.5-Secondary Output Voltage Circuit 34
4.6-Sampling Circuit 36
4.7-Error Detection Circuit 38
4.8-Feedback Circuit 39
4.9-Protection Circuit 40
4.10-Standby Circuit 50
4.11-Power Factor Correction (PFC) Circuit 56
5. Electronic Components Found In SMPS and Possible Causes 62
6. How To Find The Right Equivalent Components In SMPS Circuit 86
Part II
Secrets of SMPS Troubleshooting Techniques
7. Recommended Tools and Test Equipment For Successful SMPS Repair 95
7.1-Isolation Transformer 96
7.2-Variable Transformer 98
7.3-AC Ammeter 100
7.4-Analog and Digital Multimeter 102
7.5-Digital Capacitance Meter 104
7.6-Blue ESR Meter 105
7.7-Blue Ring Tester 106
7.8-Oscilloscope 107
8. Safety Guidelines 109
9. Understand The Six Common Problems Found In SMPS 115
9.1-No Power 115
9.2-Low Output Voltage 117
9.3-High Output Voltage 118
9.4-Power Cycling/Pulsating/Blinking 118
9.5-Power Shutdown 121
9.6-Intermittent Power Problem 121
10. How to Easily Discharge The Main Capacitor In SMPS 122
11. How to Easily Perform Voltage Testing On SMPS Circuit 127
12. How to Use Oscilloscope to Test SMPS Circuit Waveforms 140
13. Find Out How Useful Is The Series Light Bulb Trick In SMPS Repairs 154
13.1-Light Bulb Off 156
13.2-Light Bulb Very Bright 157
13.2-Light Bulb Pulsating/Blinking (Slow or Fast) 158
14. The Five Methods That I Use To Troubleshoot And Repair SMPS 161
14.1-Using the Blue Ring Tester Method 161
14.2-Flickering Method 165
14.3-Resistance Test Method 168
14.4-Isolation Method 170
14.5-Secondary Diode Removal Method 177
15. Simple Way For Beginners To Troubleshoot And Repair Any
Type Of SMPS By Following My Favourite Method 179
16. What Should You Do If Too Many Components Burnt In The SMPS 189
17. How To Know If The Substitution Part Number Will Last Or Not 195
Part III
True Case Histories
18. 11 True Case Histories of SMPS Repair That You Should Not Miss 200
PART IV
Troubleshooting and Repairing ATX Power Supply
19. Troubleshooting And Repairing ATX Power Supply 227
20. ATX Power Supply Repair True Case Histories 245
Part V
Miscellaneous
21. Understanding Power Supply Glossary Terms 262
22. Recommended Electronic Repair E-Books 267
23. Recommended Resources 269
24. Conclusion 271