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Intermittent In Two LG LCD Monitors Repaired

By on February 27, 2020

 

 

 

 

 

 

lg lcd monitor repair

These two monitors were brought to me from a faraway distance, by one of my close friends with the complaint that the monitors are intermittent and in one, the colour changed from red, blue to green intermittently.

lg monitor power supply repair

After doing a general clean up, I checked the Adapter first.

I opened the Adapter and found a lot of dry solder on the board. Hence did a thorough dry solder patch up and also replaced the electrolytic capacitors in it. Then when I powered it up, it was steady and showing output voltage perfectly.

lg lcd monitor mainboard repair

lg lcd monitor mainboard fix

After having got the desired result, I connected the adapter to the monitor, which is reported to be showing RGB intermittently. Observed the case. Then disconnected and opened the monitor. Saw a few dry solders, which I patched up. Also replaced the electrolytic capacitors in it. Then when I switched it on and left it for a few hours, it was steady.

lg lcd monitor mianboard problem

how  to fix lg lcd monitor

Even the other monitor was working perfectly and perhaps the problem was only in the adapter, which I have now solved.




The picture of the defective components is also added below:

how  to fix and repair lg lcd monitor

The net result of this repair work was also very satisfactory and I allowed it to jump into the collection bag unhesitatingly.

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/bad-high-voltage-capacitor-in-microwave-oven/

 

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11 Comments

  1. Albert van Bemmelen

    February 28, 2020 at 1:23 am

    Opening up these modern monitors is often the hardest part. Which mostly starts by carefully removing the outside frontcover with force without breaking the plastic case or the glass screen under it. But I guess it was a too easy job why you took two of them simulteneously in one go! (lol).

    Likes(2)Dislikes(2)
    • Parasuraman S

      February 28, 2020 at 4:58 pm

      Many thanks! It came from same customer and he brought both as he was coming from a far away distance and wanted to ensure that there is nothing wrong inside.

      Likes(1)Dislikes(0)
    • Parasuraman S

      February 28, 2020 at 4:59 pm

      Yes, we need to open the monitors very carefully. There are special tools for it.

      Likes(1)Dislikes(0)
      • Michael Lindsay

        March 2, 2020 at 11:37 am

        Parasuraman S, what special tools do you mean? I could use one for myself, Sir. I've just started learning repair from the articles which you and others and Mr. Yong are sharing. They are very important to read and learn from. Thank you.

        Likes(1)Dislikes(0)
        • Parasuraman S

          March 2, 2020 at 1:22 pm

          Kindly see this link

          Likes(0)Dislikes(0)
  2. Clinton chilupula

    March 2, 2020 at 7:46 am

    That's nice

    Likes(1)Dislikes(0)
    • Parasuraman S

      March 2, 2020 at 1:22 pm

      Thanks!

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

    March 2, 2020 at 6:14 pm

    Well Done! Sir
    Albert you are right Plastic gets degraded over long period of time & it gets broken easily when giving pressure for opening.

    Likes(1)Dislikes(0)
  4. Parasuraman S

    March 3, 2020 at 9:26 pm

    Many thanks Yogesh! The plastic gets dry over a period of time and becomes brittle. It sometimes develops crack by itself.

    Likes(0)Dislikes(0)
  5. Humberto

    March 12, 2020 at 4:33 am

    Well done Parasuraman. Congratulations.

    Likes(1)Dislikes(0)
    • Parasuraman S

      April 6, 2020 at 8:18 am

      Many thanks!

      Likes(0)Dislikes(0)

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