Blown SMD Resistor In Digital Multimeter

By on March 7, 2018
how to fix and repair digital multimeter

 

 

 

 

 

 

 

 

 

While working on equipment by mistake I have measured DC 320v on main filter capacitor while my range selector of multimeter was on Diode testing mode.

digital multimeter repair

Screen of the meter flickered and I come to know that I have did something wrong. While checked the position of selection knob I realize what I did I have measured the Dc voltage on Ohm Range and spoiled the meter for confirm I have short two probes of meter for continuity there is no movement of digits on the screen so for confirmation of other section I have tested AC and Dc voltages both are worked well. So concluded the problem is with resistance range only. (I had made this mistake before also with my analog Meter Checked 320V DC while selection knob was on ohm range and was damaged since then I kept analog meter beside and brought this Digital Meter.)




Now no choice beside to get new Meter, so I have kept the equipment as it is and phoned to my parts vendor but he was not picking up the phone I was helpless because that day is Thursday and shops in that area remain weekly closed.

So I have decided to open and at least see in side if I can do something. So I have opened the meter for visual inspection. Selector strips all are Ok no burn marks and all the parts are look ok.

how to repair digital multimeter

For reconfirming the inspection I took my magnifier glass and started re checking the unit I found one resistor Marked R16 looks doubtful under the magnifier glass.

how to fix digital multimeter

Marking on the resistor is not readable so I have googled and found this resistor is of 1.3kΩ I am not having this value of resistor with me in my parts box I have decide to try with some nearby value I have arranged 1K ¼ watt resistor.




Removed this SMD resistor and soldered this carbon film resistor on its place

how to fix and repair multimeter

Now it’s time to test the multimeter ……………….

how to repair and fix multimeter

Test on diode range by shorting two probes I got the continuity & Beep……………………….resistance testing also done.

fixing multimeter

Tested 27Ω Resistor reads perfect. So now it is time to get back to the work!!!!!!

 

This article was prepared for you by Yogesh Panchal who works as a Computer Hardware Engineer in Mumbai India.




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http://jestineyong.com/lenovo-laptop-with-display-problem-repaired/

 

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35 Comments

  1. R Murali

    March 7, 2018 at 9:56 pm

    great. thanks for sharing

    Likes(0)Dislikes(0)
    • Yogesh Panchal

      March 14, 2018 at 10:25 pm

      Thanks for your comment Mr. Murali.

      Likes(0)Dislikes(0)
  2. Suranga Electronics

    March 7, 2018 at 10:03 pm

    Good SMD Type Fault Finding .
    Mr- Yogesh.

    Likes(1)Dislikes(1)
    • Yogesh Panchal

      March 14, 2018 at 10:26 pm

      Thanks! Suranga.

      Likes(0)Dislikes(0)
  3. Andrew F. Ali

    March 7, 2018 at 10:07 pm

    I too have damaged many DMM and Analogue meters that same way. I would fling them out and just buy another. Cheap one to replace just in case I make the same mistake again. If it is cheap it won't bother me so much but if it is an expensive meter I'll scream really loud and ase swear words.

    Likes(4)Dislikes(1)
    • Yogesh Panchal

      March 14, 2018 at 10:30 pm

      Andrew,
      Next time Just have a look into the bad equipment before fling them, may be it is of 10 minutes Job to revive the equipment.

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

    March 7, 2018 at 10:31 pm

    Like they say a mistake corrected is no mistake made! Especially if it was your own (LOL). Good job taking care of our most important test equipment Yogesh!

    Likes(3)Dislikes(0)
    • Yogesh Panchal

      March 14, 2018 at 10:31 pm

      Thanks! Albert.

      Likes(0)Dislikes(0)
  5. Parasuraman

    March 7, 2018 at 10:36 pm

    Ingenuity in practice!

    Likes(2)Dislikes(0)
    • Yogesh Panchal

      March 14, 2018 at 10:32 pm

      Thank you! Sir.

      Likes(0)Dislikes(0)
  6. Henrique Jorge Guimarães Ulbrich

    March 7, 2018 at 11:25 pm

    Very good, Yogesh, thanks for sharing your experience. However, the function of the resistor in the circuit was not stated. And it´s interesting that, in a good precision multimeter like this, a difference in the resistor values (1 kohm - 1.3 kohm) did not affected the measuring precision.

    Likes(0)Dislikes(0)
    • Yogesh Panchal

      March 14, 2018 at 10:35 pm

      Henrique,

      After replacing the resistor i took reading in all OHM range it is showing accurate reading.

      Likes(0)Dislikes(0)
  7. Robert Calk

    March 8, 2018 at 1:55 am

    Good job Yogesh. I like to take devices apart and take photos in case I need to know what a part number in the future. You are lucky that the MC wasn't damaged. You do not save old boards to salvage SMD and other components from?

    Likes(5)Dislikes(0)
    • Yogesh Panchal

      March 14, 2018 at 10:44 pm

      Sir,

      I made habit to first take the photo of whole circuit with wiring location and than i start the inspection.This machine is look like new from inside though using this since last 5 years .I periodically clean the tools.for salvage the SMD i have few junk boards with me but i did not found nearby value of resistor.

      Likes(2)Dislikes(0)
  8. Mark

    March 8, 2018 at 4:28 am

    Hey Yogesh,

    Thanks for your article. I have a multimeter that I accidentally fried years ago when testing a microwave oven. Apparently it didn't like the 4,000 Volts I put through it!
    Did you find a wiring diagram for your multimeter? If so, where? I would like to get mine running again, but would feel more confident using a wiring diagram.
    Cheers

    Mark

    Likes(4)Dislikes(0)
    • Yogesh Panchal

      March 15, 2018 at 4:05 pm

      Mark,
      This is the site from where i got clue - https://www.petervis.com/meters/dt830d/dt830d-multimeter-circuit.html.

      Likes(1)Dislikes(0)
  9. Saqib Sami

    March 8, 2018 at 5:09 am

    Great work Sir.

    Likes(2)Dislikes(0)
    • Yogesh Panchal

      March 15, 2018 at 4:06 pm

      Saqib Sami,

      Thanks! for the Comment.

      Likes(0)Dislikes(0)
  10. Lee

    March 8, 2018 at 6:31 am

    Some times You have to make do with what you have and if that means repairing something the that's OK.
    Glad it worked out for you, not good being without one meter.

    Likes(2)Dislikes(0)
    • Yogesh Panchal

      March 15, 2018 at 4:09 pm

      Lee,

      Thanks! for your comment.

      Likes(0)Dislikes(0)
  11. S Ramachandran

    March 8, 2018 at 11:16 am

    Good job ..

    Likes(0)Dislikes(0)
    • Yogesh Panchal

      March 15, 2018 at 4:10 pm

      Thank you! Sir.

      Likes(0)Dislikes(0)
  12. Dan Stark

    March 9, 2018 at 2:19 am

    Thank you for posting your findings and solution on the damage votage meter. I too have damaged a DMM meter and have the same symptoms in the display. My conar M-1400 DMM must have the same burned out "resistor" and I now know what to really look for. Thanks for sharing.

    Likes(1)Dislikes(0)
    • Yogesh Panchal

      March 15, 2018 at 4:11 pm

      Dan Stark,

      Your Welcome!

      Likes(0)Dislikes(0)
  13. Ulises Aguilar

    March 9, 2018 at 11:49 am

    Mr Panchal ,, grate Sir i will keep ,in mined

    Likes(0)Dislikes(0)
    • Yogesh Panchal

      March 15, 2018 at 4:12 pm

      Ulises Aguilar,
      Thank You!

      Likes(0)Dislikes(0)
  14. Justice

    March 10, 2018 at 7:26 pm

    Thanks Yogesh superb article.

    Likes(0)Dislikes(0)
    • Yogesh Panchal

      March 15, 2018 at 4:13 pm

      Justice,
      Your welcome!

      Likes(0)Dislikes(0)
  15. MontyAbdo

    March 14, 2018 at 5:08 pm

    God bless you, Mr Yogesh Panchal

    Likes(1)Dislikes(0)
  16. Yogesh Panchal

    March 15, 2018 at 4:13 pm

    MontyAbdo,
    Thanks!for your comment.

    Likes(0)Dislikes(0)
  17. Prince Charles

    March 16, 2018 at 10:20 pm

    Good job well done and thank you for the website was searching for this but was not lucky to find a good clue

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

    March 18, 2018 at 1:07 am

    Prince,
    Your welcome!

    Likes(0)Dislikes(0)
  19. Vidyabhushan

    April 30, 2018 at 7:43 pm

    I gone through u r article,I too find similar observation on R16, kept it pending,but accidentally I observed there Are 5
    Connection strips in my meter,but this morning I saw 6 strips on some ones ons meter on u tube .it confused me whether I lost one of them in my meter when I first time opened it.Or my meter is different version.Any way I will first atten R16..

    Likes(0)Dislikes(0)
  20. Vishvanath Subhash Doijad

    August 21, 2018 at 1:58 pm

    What is the value of R5

    Likes(0)Dislikes(0)
  21. Saurav saha

    September 4, 2018 at 1:02 pm

    Sir
    I unfortunately damage the smd resistor R16 and R17 can u tell me the value of it

    Likes(0)Dislikes(0)

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