This Computer SMPS Survived A Third Attempt On Its Life – Story Of INTEX TECHNO ATX SMPS
The above image is an extract form my previous article:
https://jestineyong.com/maintenance-done-in-computer-smps-lasted-for-five-years/
This computer SMPS got serviced first in March, 2017, second in April, 2022 and got readmitted in December, 2024 withthe complaint that it was dead. As cleaning was already done by the IT-Administrator, I focused on what went wrong with this lovely SMPS this time!
On trying to power it on through a series bulb, the bulb lit brightly indicating that something was definitely short inside.
Then I saw that one 330uF/250V cap had developed a tiny tumor on its head. On removing and checking the cap look at what I saw:
The 330uF cap was showing a value of 0.018nF! I don’t think that I have ever seen a cap like this before! I replaced both the caps and continued to check all the components in the primary and found that two numbers of MJE13007B switching transistors were also short.
I replaced them with ME13009. Let us have a look of it before it was fixed:
Then I combed the entire primary and secondary and looked for any more troubles!
Could not find any and so powered the SMPS up with the Checker and fan with an additional load of 12V 25W bulb. It was found working very well:
I allowed it to be on for a sufficient time before closing the covers and transferring it to a bag for carrying it to the hospital, in the meanwhile of which the collection bag did catch the satisfaction to put it in!
This article was prepared for you by Parasuraman Subramanian from India. He is 74 years old and has more than 30 years’ experience in handling antique equipment like Valve Radio, Amps, Reel Tape Recorders and currently studying latest tech-classes conducted by Kerala State Electronics Technicians’ Association. He has done graduation in BBA degree, private diploma in Radio Engineering and retired as MD of a USA company. Presently working as Consultant to Hospital and other institutions.
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You may check on his previous article on Dead Instant Chappathi Maker Chefmaster Classique Restored To Working Condition
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Waleed Rishmawi
July 5, 2025 at 12:49 pm
From the article title I knew it was you doing this kind of repair and as always a well done professional repair. I always enjoy your articles. Thanks for sharing
Parasuraman S
July 5, 2025 at 7:48 pm
Many, many thanks for your encouraging comments, dear friend! May God bless you!
Albert van Bemmelen
July 5, 2025 at 3:24 pm
The fact that you even kept the data when this smsps unit was fixed before tells us how meticulous your repairs are carried out!
Parasuraman S
July 5, 2025 at 7:52 pm
Perhaps I inherited this from my Dad, who was a mechanical engineer and very strict in meticulous way of working. He always said 'There has to be a place for everything and everything should be in its place' often! Very punctual, always very patient and tolerant and the list can go on and on! What I practise is not even a fraction of what he was!
Many thanks for your lovely encouraging comments, dear Albert and May God bless you!
Paris Azis
July 5, 2025 at 5:10 pm
"Then I saw that one 330μF/250V cap had developed a tiny tumor on its head"!...
Oh, doctor Parasuraman!!...
(And I was wrongly believing so far that "a tiny tumor in the head" is translated into "rest in peace")!
Truly now, are you not willing to let this psu to rest in peace some time in the future? Its manufacturer might put a death contract against you!...
Parasuraman S
July 5, 2025 at 7:55 pm
I laughed and laughed my head out! Many thanks for your comments, dear Paris! Kindly protect me ensuring that the manufacturer never comes to know of this
Hollis LuQuette
July 6, 2025 at 12:41 am
I also loved the " Tiny Tumor " line ...... Once all quality parts are in there it's not going to come back for repairs anytime soon..... Great job....
Parasuraman S
July 8, 2025 at 12:26 pm
Thanks! I always try my best to make the reading interesting!
Mark J
July 6, 2025 at 2:38 am
Parasuraman another well done smps repair. Would should all be meticulous like you and to be patient and tolerant.
Parasuraman S
July 8, 2025 at 12:27 pm
In our trade, especially, we need to be patient and tolerant! Many thanks, dear Mark!
Yogesh Panchal
July 7, 2025 at 5:22 pm
Good Job! Sir
Now a days "Tumors" are positively curable because of advance diagnosis & eliminate system technology (Here one you have MS1980).....
Parasuraman S
July 8, 2025 at 12:29 pm
Many thanks for your comments, dear Yogesh!
Humberto
July 10, 2025 at 8:23 pm
Good repair in this SMPS. The ME13009 transistores are very used in this kind of device. Congratulations
Parasuraman S
July 11, 2025 at 8:20 pm
Many thanks, dear Humberto!