External Universal PWM Switching STR Power Module
While we repair SMPS sometime we don’t find any reference or unavailability of PWM IC , Switching Mosfet .Sometime marking code are also missing from the parts because of burnout or the manufacturer removed marking intentionally.
In this situation it is difficult to repair the SMPS. For this type of repair some external switching modules are available in the market, sharing here one of the module model DS-0088 installation process. Basic switching of SMPS is same so this installation process is applicable to all the SMPS same way.
Different modules having different color code & numbers of wires some module have 3 wires some module 4 wires so do not trust on any wire color code as standard. Mostly modules come with installation diagram so please refer it carefully.
Note: Before Installation of this types of module, Remove PWM IC, Switching MOSFET / Transistor & make it sure that there is no any other shoring on the primary side of the SMPS circuit by cold testing after removing above components. The module looks like the one below:
On final fitting make sure to install it in original heat sink position & pay attention to proper insulation while installing the module.
Sharing the connection diagram so that the wiring can be understood easily.
Red Cross is either component removed or trace cut.
Before turning ON the SMPS, power the SMPS through Series Test Bulb Board.
Sometime modules do not work because of different current required as per the SMPS design by the manufacturer, so confirm with the supplier for what purpose you are buying the module.
This article was prepared for you by Yogesh Panchal who works as a Computer Hardware Engineer in Mumbai India.
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Note: You can check his previous repair articles on 3 Pins On-On-Off Self-Lock Tactile Switch.
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Waleed Rishmawi
May 24, 2025 at 1:25 pm
thanks for sharing the diagram of the installation. I have not used these kinds of module before.have a blessed day
Yogesh Panchal
May 25, 2025 at 1:02 am
Waleed,
These are common module used in LCD / LED in INDIA.
Andrew F. Ali
May 25, 2025 at 4:01 am
Very well illustrated.
I cannot use these because the voltage in my are is 120Vac and so I don't get the B+ boost 330Vdc across the Main filter capacitor. Thanks.
Yogesh Panchal
May 25, 2025 at 3:18 pm
Thank you! Andrew F. Ali
This module should work in SMPS Switching because it works on reference input voltage.
Parasuraman S
May 24, 2025 at 2:42 pm
Thanks, Yogesh Bai! I have used such modules in many repairs and have also shared the way they are connected. But your article is too good and serves as an authentic reference! Good job!
Yogesh Panchal
May 25, 2025 at 1:11 am
Thank You! Sir,
Inspired by your repairs, I tried this type of module.
Tree
May 24, 2025 at 3:01 pm
Good job thank you very much
Yogesh Panchal
May 25, 2025 at 1:12 am
You're welcome! Tree
Tyrone
May 24, 2025 at 4:08 pm
Thank you for the informative information
Yogesh Panchal
May 25, 2025 at 1:12 am
thanks!Tyrone
Albert van Bemmelen
May 24, 2025 at 6:20 pm
Thanks Yogesh for this very clear explaining on how to use these 5 wire power modules!
I know that dear Parasuraman uses them in many of his repairs but I never have had the experience to use these universal modules successfully in any of mine yet. Also because none of my repairs could be fixed with them, mostly because transformers or other necessary parts were defect and needed replacement too.
Yogesh Panchal
May 25, 2025 at 1:19 am
Albert,
These modules are very useful when you can't find replacement parts for SMPS switching.I was also inspired by Parasuraman Sir to try this module.
Humberto
May 24, 2025 at 8:30 pm
Thanks for sharing Yogesh. By the way, which STR exactly is connected in this module?
Yogesh Panchal
May 25, 2025 at 1:00 am
Humberto,
Most commonly used modules are DM465,CA888,DS0088 & STR used is 5L0380R & DM0465R.
Mark J
May 25, 2025 at 2:36 am
Yogesh great article. Thank you for sharing. I have never had a chance to use these modules yet. Nice diagram.
Yogesh Panchal
May 25, 2025 at 3:09 pm
Thank you! Mark J
May this will be handy in your future repairs.
hako
May 25, 2025 at 7:33 pm
there is a link to buy??
Yogesh Panchal
May 26, 2025 at 12:17 am
Which country??
Muykit
May 26, 2025 at 4:26 pm
Thanks Engineer Yogesh. In your particular explained example, can the 3-wire power module work ?
Yogesh Panchal
May 26, 2025 at 5:47 pm
Muykit,
I think 3 wire module is bigger in size ,If size does not matter it will work.
Imoudu
May 27, 2025 at 12:57 am
Thanks Yogesh,I too do use it on any smps when nessary.
Yogesh Panchal
May 27, 2025 at 2:57 pm
you're Welcome! Imoudu,
Glad to know.
Tito Kanshulu
May 30, 2025 at 2:23 pm
Yogesh, this article has come at a right time. Since these modules come with different number of wires, it is very difficult for some of us to know where to place the required wire. With your article, our eyes have been open. Here in Africa these modules are available in our markets and are being used. Thanks for sharing.
Yogesh Panchal
June 1, 2025 at 7:13 pm
your welcome! Tito Kanshulu