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Still Have Hope In A Faulty Switch Mode Power Supply

By on March 17, 2020
led tv power supply modification

macksonic led tv repair

This Macksonic 32 inch LED TV came in for repair with the complaint of lightning struck. The customer asked me do my best to repair it because it was a gift by someone. The below photo is the power supply and mainboard (two in one) that built in together.

First, it looks complicated but as you take your time to see it properly, you can actually see the power supply section at the left side and the mainboard section is at the right side.

macksonic led tv repair and fix

The next thing I did was to check on the main fuse and the bridge rectifier and both the components were bad. See the photo below:

macksonic led tv repair and fix power supply

I’m not sure how did the customer knew about his TV was struck by lightning, so I proceeded to check on the power FET  and power IC. With Ohm test both components were having short circuit

macksonic led tv repair and fix smps

As I went along to check other components in the power side, I stumbled a slight burnt SMD resistor. Even the Optoisolator IC was bad too!

how to fix macksonic led tv

There seems to  be so many components that had problem and it was not easy for me to place order for the power FET and the power IC because it will take sometimes to reach my country.

The fastest way and the only choice I have was to do a modification by using the module below:

power supply modification module

I can’t document everything in this article as it will take lots of pages to explain how I have successfully modified it. If you really need to learn how the modification can be done then check out on Jestine Yong’s ebook here on power supply modification. This ebook worth the investment because with one successful modification on the power supply for your customer, you will get back the investment.

In this power supply modification you really need to know where to tap on the points in the primary power section. Below are the photos taken after I had done the modification:

led tv power supply burn repair

macksonic led 32 inch power supply repairing

macksonic led 32 inch power supply repair

Conclusion- If you can find parts or  you have ready parts then there is no need for the modification. If you can’t locate the part, missing part number or even someone took out the components then the only choice you have is to modify the power supply. I had actually done few of this modifications and it  was quite reliable. In times to come I will share to you another power supply repair with this kind of modification. Ok, will see you again in the next article.


This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.

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  1. Parasuraman S

    March 17, 2020 at 9:54 pm

    Very intelligent solution found! Good job there!

  2. Waleed Rishmawi

    March 17, 2020 at 10:14 pm

    a job well done on the repair. keep up the good work and thanks for sharing. have a safe blessed day.

  3. Albert van Bemmelen

    March 17, 2020 at 11:40 pm

    I wonder how you were certain that the replacement PWM module was sufficient to drive this 32 inch tv? I understand this module is the Fairchild FSDM0465rs chip and it is limited to about 56 Watt max? Also depending on the way how the chip is cooled.

  4. Andrew

    March 18, 2020 at 1:30 am

    Were can I get these PSU modification pcb' kit?

    • Albert van Bemmelen

      March 19, 2020 at 1:25 am

      Hi Andrew, see here which probably is the module

      • Albert van Bemmelen

        March 19, 2020 at 3:39 am

        This module is probably also better maximum Power wise because this DM0565 module dissipates upto 80 Watt compared to the lesser dissipating FSDM0465 module that Suranga used.

  5. Imoudu Onwumah

    March 19, 2020 at 5:51 am

    Good and intelligent repair work. I once did such modification on an akira 32" led tv with t.v power module. The power module can be purchased from E-bay online or directly from Humphrey Kimathi.l did purchase mine from him.

  6. Robert Calk Jr.

    March 19, 2020 at 4:22 pm

    Good job, Suranga! That is a quick and inexpensive way to get the TV back to the customer. I recommend all of Mr. Yong's e-books!

  7. Gassan Ali

    March 19, 2020 at 11:23 pm

    It's a great repair!

  8. Andrea Del Corso

    March 21, 2020 at 11:04 pm

    Excellent solution for repairing,thank you.

  9. Humberto

    April 1, 2020 at 2:55 am

    Great repair, as usual. Congratulations.

  10. ulises aguilar pazzani

    April 17, 2020 at 11:20 am

    good night Mr Suranga Bandara another grate fix


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