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Restored A Defective Power Supply And Motherboard In Samsung Monitor 632NW

By on May 4, 2022
lcd monitor repair

 

 

 

 

 

 

how to fix a broken lcd monitor

This monitor belongs to the hospital where I work. It was brought to me with the complaint that it sometimes gets on and sometimes it takes longer time. As the IT administrator helped me clean the set after I opened it there itself, I carried only the panel, power supply board and mother board along with the keyboard strip. When I looked at the power supply, it had such a lot of dry solders on it that I wondered how it was working still! I checked the ESRs of the caps both on the PS board and Mother Board. Most of these were way out of range.

So I replaced all the caps on the PS board and also did a thorough retouch. I have the habit of checking for any man-made short after a retouch of the complete board. I used my microscope for inspection and indeed I found two pins of a transistor were shorted! From my experience I have learnt that after we retouch the board, it is mandatory for checking what we did thoroughly, as any careless mistake done by us can spoil the entire board or even the device. Rectified the mistake and thoroughly cleaned the board, which looked like fresh (Did it breath a fresh life? I felt so when I looked at it!)

samsung lcd monitor fix

Then took the mother board for replacement of caps. As this PCB is multilayered, I used my ever time method of holding the aluminium capacitor by a nose pliers and gently shaking it to both sides, opposite to the soldered legs. By doing it gently and holding the cap close to the board, it will come off by itself. I have explained this method in a few of my previous articles and do not want to repeat it here. (Micro Switch Found Short In Sony Car Stereo | Electronics Repair And Technology News (jestineyong.com)) There was some video also in Youtube, but now I am unable to remember or fetch it.

samsung lcd monitor mainboard repair

how to repair samsung lcd monitor motherboard

After cleaning the board thoroughly, I reconnected the PS and mother board to the panel. It was found working very well. Brought these to the Hospital and assembled the Monitor back.

Switched on and found it was working very well there too. Mission accomplished and satisfaction had ample reason to jump into its collection bag.

how to repair a borken samsung lcd monitor

bad capacitors in pcb board

Special notes: (1) Always make sure that our work is rechecked very well, especially when we do a mass retouch of the board or replacement of components. (2) It is a good idea to make sure that the polarity of the components removed match with what is marked on the board. I have had experiences, where even reputed manufacturers’ made mistakes. They do release service bulletins to their technical service team, but we would never get it or know about it!



(3) Always check the new caps for ESR and value and never take these for granted. Shorted caps, value different caps etc. are often found. (4) Search and do self-learning to sharpen our troubleshooting and rectification techniques. (5) Do your best to give a fresh life to the device you set your hand on, and do what best you can not to allow it to come back soon!

This article was prepared for you by Parasuraman Subramanian from India. He is 72 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 Restored A Lovely LED Surface Panel Light

 

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22 Comments

  1. Albert van Bemmelen

    May 4, 2022 at 12:56 pm

    Another good and quick repair! Samsung nowadays makes all kind of devices like even refrigerators. I recently replaced my 22 years old bad working Indesit by one made by Samsung. Hope that the Digital Inverter Technology they use inside my new fridge does not have bad ecaps that need replacement for a very long time!

    Likes(3)Dislikes(0)
    • Parasuraman S

      May 8, 2022 at 10:57 pm

      Many thanks for your comments and tips!

      Likes(1)Dislikes(0)
  2. Anil Kumar V K

    May 4, 2022 at 12:56 pm

    Exellent work sir

    Likes(1)Dislikes(0)
    • Parasuraman S

      May 8, 2022 at 10:57 pm

      Many thanks!

      Likes(0)Dislikes(0)
  3. Imoudu.O

    May 4, 2022 at 2:36 pm

    Well done sir and thanks for sharing. When I read ur first article on how to remove this smd e-cap with the use of nose pliers,I tried to practice this method on a scrab board but found the solder pad always remove from board,so started using soldering iron which also has its disadvantage.Now you said there is YouTube on it, I will search it out and watch.

    Likes(1)Dislikes(0)
    • Parasuraman S

      May 8, 2022 at 10:59 pm

      You need to shake it gently to the sides where the legs are not there and keep it pressed down. By a little bit of practice, we can learn it without causing a damage to the board. Many thanks!

      Likes(0)Dislikes(0)
  4. Erik

    May 4, 2022 at 7:26 pm

    Hello Parasuraman Subramanian,

    Its a pitty that you not show me how to resolder new SMD parts.
    Please give some advise
    thanks
    erik b.

    Likes(1)Dislikes(0)
    • Parasuraman S

      May 8, 2022 at 11:00 pm

      I suggest you take help from free videos available online. Many thanks!

      Likes(0)Dislikes(0)
  5. Abigail Karonga

    May 4, 2022 at 10:06 pm

    Thank you for sharing.

    Your experience and expertise is speaking much louder and worth reading.

    I always learn a lot from your articles and thank you for reminding us to always check our work when we retouch our PC boards.

    Keep sharing your knowledge its indeed changing and transforming lives.

    Till next articles stay blessed.

    Likes(1)Dislikes(0)
    • Parasuraman S

      May 8, 2022 at 11:01 pm

      Many thanks for your comments and encouragement!

      Likes(0)Dislikes(0)
  6. Babu M S

    May 5, 2022 at 12:32 am

    Excellent work and special notes sir.

    Likes(1)Dislikes(0)
    • Parasuraman S

      May 8, 2022 at 11:01 pm

      Many thanks!

      Likes(0)Dislikes(0)
  7. Lynn Blakely

    May 5, 2022 at 5:41 am

    Another job will done Parasuraman: by being thorough and double checking our work helps to eliminate call backs. Using a magnifier also helps to check our work.

    Likes(1)Dislikes(0)
    • Parasuraman S

      May 8, 2022 at 11:02 pm

      Many thanks for your comments and suggestion!

      Likes(0)Dislikes(0)
  8. Tito Kanshulu

    May 6, 2022 at 1:38 am

    Sir, thanks for the well explained article. I have been able to grasp something worth applying in the course of doing the repairs. That is checking for possible short after retouching. Thanks

    Likes(1)Dislikes(0)
    • Parasuraman S

      May 8, 2022 at 11:02 pm

      Many thanks! I am glad that the article was useful to you!

      Likes(0)Dislikes(0)
  9. Yogesh Panchal

    May 7, 2022 at 4:11 pm

    Good Repair Sir,
    Removing Aluminum Caps from multi layer PCB is not easy task it will ripped off traces some time.

    Likes(1)Dislikes(0)
    • Yogesh Panchal

      May 7, 2022 at 10:59 pm

      Once the SMD Aluminum Capacitor is exploded due to over heat when i was using Hot air station for removing.
      here is the link showing how to remove SMD Aluminum capacitor using Pliers

      Likes(1)Dislikes(0)
      • Parasuraman S

        May 8, 2022 at 11:03 pm

        Many thanks for finding out the link!

        Likes(0)Dislikes(0)
    • Parasuraman S

      May 8, 2022 at 11:03 pm

      Yes, you are right!

      Likes(0)Dislikes(0)
  10. Waleed Rishmawi

    May 7, 2022 at 8:16 pm

    Excellent repair work. Thanks for sharing

    Likes(1)Dislikes(0)
    • Parasuraman S

      May 8, 2022 at 11:09 pm

      Many thanks, dear!

      Likes(0)Dislikes(0)

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