Review & Recommended Viewing:
Troubleshoot and Repair Switch Mode Power Supplies Like A Professional...

My Nady SMPS Phantom power supply broke down during the holidays of 2009. I couldn't get anyone to fix it since all the technicians I trust to do the repairs with won't be back until after the holidays. So instead, I tried to fix it myself.

Now I'm not an electrician, technician or have any experience with this sort of thing. And with no one to turn to, I went the way of the internet to find out how I could make it happen.

After going through different forums and power supply specific sites, this eBook always got recommended. So I bought it, gave it a try... and after all was said and done I'm stunned at how easy and quick repairing an SMPS turned out to be!


Unlike other repair guides or repair manuals that is full of theory and not much on hands-on practical stuff, Troubleshooting & Repairing Switch Mode Power Supplies takes you by the hand and walks you through each and every step of the way.

Understand how Switch Mode Power Supplies work, how to read and identify each part of a schematic diagram, learn how to isolate problems and the use of waveforms and voltages to identify trouble spots.

Plus, 246 Photos and diagrams in 271 pages to make sure you're on the right track. And discover 5 Secret methods to easily troubleshoot and repair any type of SMPS.

The author, Jestine Yong, clearly knows what he's talking about. After 20 years in the electronic repair line and having repaired thousands and thousands of SMPS, he's the guy to go to.

With this eBook you will...

  • get easy to follow step by step detailed instructions. All 271 pages of it!
  • understand how Switch Mode Power Supplies work.
  • know how to read the Schematic Diagram and the functions of each SMPS component.
  • know how to troubleshoot, isolate and fix problems in SMPS.
  • understand the critical waveforms and voltages in many parts of the SMPS section.
  • complete full color photos and diagrams to go along with the instructions.
  • discover the a11 circuit functions of SMPS.
  • learn the 5 surefire methods of troubleshooting and repairing any type of SMPS.
  • learn 11 important true case histories in SMPS repair that can practically and efficiently assist you in repairing SMPS.
  • learn 13 chosen true case histories in ATX power supplies repair.
"..kind of information can't be learnt from college or internet too."

"Even though I had repaired many electronic devices (over 10 years of experience), after I read this eBook, I can say that there are still more details about SMPS power supply that I did not know... One of the simple and powerful tips was how to know if an equivalent part number can be used or not... I will highly recommend this useful and helpful SMPS repair eBook to my repair friends and members too. With this eBook, it can help them to improve the skills on troubleshooting and repairing SMPS power supply like a Pro!

Kevin Lo

So even for someone with little to no experience with repairing or even handling electronic devices this eBook does some magic.

Overall, I have to say that whether you’re a complete beginner or someone who's been repairing switch mode power supplies forever, this ebook is absolutely worth the price you'll pay for it.

Both beginners and long time technicians are sure to pick up great insights to the many tips and tricks in repairing SMPS.

Just look at me, I've become so good at repairing SMPS, I'm doing this on the side : )

Click Here To Order Troubleshooting & Repairing Switch Mode Power Supplies eBook Now!
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Switch Mode Power Supplies

Switched-mode power supplies or SMPS are electronic power supply units that transmit power from a source to a load. An example of a source would be a battery or the electric grid. The load would be any electronic equipment plugged into the unit like a personal computer.

The main function of a power supply is to provide a reliable output voltage no matter what the input voltage may be. There are two kinds of power supplies, linear and switch-mode. Linear designed power supplies and switched-mode power supply.

The difference being, SMPS operate on a greater efficiency, are smaller in size, are lighter in weight and generate less heat.

Ofcourse there are also some disadvantages to SMPS, for example it's more complex design, the generation of high-amplitude, high frequency energy and a ripple voltage leading to harmonic frequencies.

A low-pass filter must also be used to block the high-amplitude, high frequency energy so as to avoid electromagnetic interference or EMI.

SMPS can be categorized into the following four types:

  • Rectifier = AC in , DC out
  • Voltage converter / Current converter = DC in, DC out
  • Frequency changer / Transformer = AC in, AC out
  • Inverter = DC in, AC out

SMPS can also be classified according to their circuit topology, with the main two types being Non-isolated topologies and Isolated topologies SMPS. An easy way to remember which is which is isolated topology SMPS always have a transformer included. 

For more information on power supplies visit

Inside The eBook

Just like what you're feeling now, I was hesitant at first to fork over money to someone I didn't know. That's why I've included the ebook's complete table of content here, so you can get a picture of what you'll get.

Part I - Introduction to SMPS

  1. Introduction to Switch Mode Power Supplies (SMPS)
  2. Identifying Electronic Components in Different Types of SMPS with the Help of Photos
  3. Block Diagram of a Typical SMPS and How It Works
  4. Easy Way to Understand the 11 Circuit Functions of SMPS with the Help of Schematic Diagrams
  5. Electronic Components Found in SMPS and Possible Causes for Failure
  6. How to Find the Right Equivalent Components in SMPS Circuit

Part II - Secrets of SMPS Troubleshooting Techniques

  1. Recommended Tools and Test Equipment for Successful SMPRS Repair
  2. Safety Guidelines
  3. Understand the Six Common Problems Found in SMPS
  4. How to Easily Discharge the Main Capacitor in SMPS
  5. How to Use Oscilloscope to Test SMPS Circuit Waveforms
  6. Find Out How useful is the Series Light Bulb Trick in SMPS Repair
  7. The Five Methods that I Use to Troubleshoot and Repair SMPS
  8. Simple Way for Beginners to Troubleshoot and Repair Any Type of SMPS by Following My Favorite Method
  9. What Should You Do if Too Many Components Burnt in the SMPS
  10. How to Know if the Substitution Part Number Will Last or Not

Part III - True Case Histories

  1. 11 True Case Histories of SMPS Repair that You Shoult Not Miss

Part IV - Troubleshooting and Repairing ATX Power Supply

  1. Troubleshooting and Repairing ATX Power Supply
  2. ATX Power Supply Repair True Case Histories

Part V - Miscellaneous

  1. Understanding Power Supply Glossary Terms
  2. Recommended Electronic Repair E-Books
  3. Recommended Resources
  4. Conclusion

And there you have it. If you don't think what you need to know about SMPS repair is in here, don't get the ebook. But if you found what you're looking for here, then what are you waiting for?

Troubleshooting & Repairing Switch Mode Power Supplies eBook Preview

Here is a preview of some of the pages inside this eBook.