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Servicing Small Size Power Supply- Model LC-8180FSX

By on October 29, 2019
atx power supply repair

 

 

 

 

 

 

 

 

 

atx power supply repair

This SMPS was brought to me with the complaint that the fan runs slowly and erratically. As, usual, opened the unit, subjected it to a thorough cleaning inside including the fan. Observed one capacitor bulgy. Checked whether the fan was running smoothly. Checked ESR of other capacitors and found these to be far beyond the limitations.




Hence removed a few and checked the capacitance and found these also to be very lower. So, replaced all the electrolytic capacitors (which is something that has become my trade mark in servicing!), finished retouching all the solder points, as there were a lot of dry solder points. No surprise, as this is round 5 years old.

bad capacitor in atx

Since the replacement capacitors for 330mfd/250V was slightly larger in size, I drilled special holes on the board and fixed it. The resistors on top of the PCB were shifted to the bottom to accommodate the larger size capacitors. As the positive point of one capacitor had encroached the ground, scraped it, keeping it at a safe distance.




 

Checked whether the top cover would fit it in properly. With a bit of squeezing, it did. Since the fan connector was found burnt, I soldered the wires directly.

bad resistor

 

faulty resistor

 

faulty resistor in power supply

 

resistor problem in atx power supply

Connected the ATX power supply checker and switched on. It worked perfectly well.

atx power supply tester

Here are the bad capacitors, which were replaced:

bad capacitor in atx power supply

Since the troubleshooting and rectification work was finished in record time, added this job too to my already lengthening satisfaction list, and did not forget to pat myself on the back, unseen by anyone, though. Otherwise, since this is not a mental hospital, someone would have called for an ambulance! (LOL)

This article was prepared for you by Parasuraman Subramanian from India. He is 69 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 repair article below:

https://jestineyong.com/open-diodes-and-dry-solders-found-in-aoc-lcd-monitor/

 

 

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8 Comments

  1. Waleed Rishmawi

    October 29, 2019 at 8:53 pm

    A job well done my friend and I have exactly the same power supply tester. It is great. Keep up the good work.

    Likes(2)Dislikes(0)
  2. Raj

    October 29, 2019 at 9:15 pm

    Great..

    Likes(1)Dislikes(0)
  3. Albert van Bemmelen

    October 30, 2019 at 5:33 am

    The local e-caps provider is always happy when you visited them! And in case they need your excellent services even faster they from time to time could provide you with free fast ambulance rides to the hospital's repair desk as an option (LOL).

    Likes(1)Dislikes(0)
    • Parasuraman S

      October 30, 2019 at 4:16 pm

      Ha! Ha! Enjoyed the joke! Yes, you are right. The local shop owner is always happy to see me!

      Likes(1)Dislikes(0)
  4. beh

    October 30, 2019 at 6:54 pm

    Before installing the new caps I always test them with meters sometime in the past I found them not so good even in a fresh shape.

    Likes(1)Dislikes(0)
    • Robert Calk Jr.

      November 2, 2019 at 10:54 am

      Those are wise words, Beh!

      Likes(1)Dislikes(0)
    • Parasuraman S

      November 4, 2019 at 9:09 am

      Yes, I do this as a routine. You are right. New caps can come out defective in the manufacturing process, and might go through unnoticed. Manufacturers do not check these 100% and do only random checking, because it is impracticable.

      Likes(1)Dislikes(0)
  5. Robert Calk Jr.

    October 31, 2019 at 7:29 am

    Good job, Parasuraman!

    Likes(1)Dislikes(0)

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