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A Multi Meter With The Issue Of Bad Display Repaired

By on September 30, 2020
unit t multimeter repair

 

 

 

 

 

 

 

One of my regular customers who is an AC technician called me late at night to inform me about his multi meter being dropped and because of that, the display on the screen was messed up.

how to fix unit t multimeter

He brought it to my shop the next day for check up and when I turned it on, well, you can see the fault in the photo.

The customer mentioned something about the multi meter was dropped and then this happened so it is either the screen is bad or it was not sitting right on its connection pad.

unit -t multimeter fix

As I took the battery and the four screws off I was able to see what lay beneath and hopefully it will get fixed.

multimeter fixed and repair

Everything on that board was intact and I was hoping to see a broken board there but I was not that lucky. I can handle broken traces on that board but bad screen means a fail in my repair mission.

multimeter board repair

The board is out of its housing and so far, it was intact and it was even clean on the inside.

unit-t multimeter circuit board repair

Finally I got to the pins where the screen sits.

The pad that sit on these pins was really dirty and most important, was not sitting right on these pins.

multimeter screen replacement

The screen was not broken on the outside which is a good sign. With a Q tip, I cleaned the connection pad and the pins on board and hoped for the best.

how to fix and repair multimeter unit-t

Mission Accomplished

This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.




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Note: You can check his previous repair articles in the link below:

https://jestineyong.com/two-way-speaker-system-with-no-sound-repaired/

 

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9 Comments

  1. Parasuraman S

    September 30, 2020 at 10:55 pm

    Like the story of a person who put back the engine of a ship to working order, by just hammering on one portion, you know pretty well where to look for a trouble, which is possible only for a professional! A skillful work! Many thanks for sharing!

    Likes(0)Dislikes(0)
    • Waleed Rishmawi

      October 1, 2020 at 3:49 pm

      Parasuraman: yes I heard of that story..lol thanks for the nice encouraging comment. have a blessed day

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  2. Albert van Bemmelen

    October 1, 2020 at 12:11 am

    Broken screens are never fixable so good thing the Liquid Crystal Display was only out of position. When the first touchscreen DMM's are available and become common good, the risk of them to break in these instances is probably much greater.

    Likes(1)Dislikes(0)
    • Waleed Rishmawi

      October 1, 2020 at 3:51 pm

      Albert: I never deal with broken screens for it is so hard to find replacements.
      have a good day

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  3. Imoudu

    October 1, 2020 at 5:33 am

    Good repair.I also have such brand,uni-t ut39A+ which I bought new.The resistance modes always malfunction i.e at times it will work and at times it will not.Any suggestions from you.

    Likes(1)Dislikes(0)
    • Waleed Rishmawi

      October 1, 2020 at 3:53 pm

      Imoudu: I would open it and clean it, maybe bad or cold soldering joints..I would find where the resistance connector on the inside of the dial and then trace it and see if there are bad or dirty connections there.

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  4. Yogesh Panchal

    October 1, 2020 at 3:49 pm

    Waleed,
    Good Attempt for fix the problem.
    Some time problems are not that much difficult.

    Likes(0)Dislikes(0)
  5. Sidonie Niba

    October 1, 2020 at 8:02 pm

    This quite smart and very helpful. Thanks for sharing. Glad to come across your website.

    Likes(0)Dislikes(0)
  6. babums

    October 1, 2020 at 11:51 pm

    Very nice job done.Thanks for sharing.

    Likes(0)Dislikes(0)

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