Still Have Hope In A Faulty Switch Mode Power Supply
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.
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:
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
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!
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:
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:
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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https://jestineyong.com/supposed-to-be-not-worth-to-repair-but/
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Parasuraman S
March 17, 2020 at 9:54 pm
Very intelligent solution found! Good job there!
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.
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.
Andrew
March 18, 2020 at 1:30 am
Hi
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.
Moreblessed
September 3, 2022 at 5:48 am
I really love it. It's very fascinating. I Love electronics and want to get involved in it.
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.
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!
Gassan Ali
March 19, 2020 at 11:23 pm
It's a great repair!
Andrea Del Corso
March 21, 2020 at 11:04 pm
Excellent solution for repairing,thank you.
Humberto
April 1, 2020 at 2:55 am
Great repair, as usual. Congratulations.
ulises aguilar pazzani
April 17, 2020 at 11:20 am
good night Mr Suranga Bandara another grate fix
Udana Arunalu
February 26, 2021 at 11:25 pm
wow that power module imported by my own company i am proud to see this thanks mr Suranga
Godfrey
March 13, 2021 at 6:06 pm
Good day, I want to know if it possible to get the whole board because mine was affected by lightning also, it only turn from blue light to red light all day, I've searched all over from a repairer but to no avail, I think if you can help me with the link to get the board from aliexpress, I'll will delighted
Moreblessed
September 3, 2022 at 5:50 am
I love it