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  • quiggy
    Senior Member
    • Aug 2014
    • 136
    • United Kingdom

    #1

    Multimeter problem

    I don't know if this is in the correct place but it made sense to post here.

    Earlier I was testing a DVD player, was testing for mains coming in and wasn't reading anything, so I unplugged the cable and put the probes into the white plug that connects to the power supply inside the DVD player. When I plugged it in my multimeter read 1000volts which I think was its max, buzzed and popped.

    How can mains burn out my multimeter? has this happened to anyone else?
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: Multimeter problem

    Was the meter set to ACV? Can we see the pictures of the damaged meter?
    Never stop learning
    Basic LCD TV and Monitor troubleshooting guides.
    http://www.badcaps.net/forum/showthr...956#post305956

    Voltage Regulator (LDO) testing:
    http://www.badcaps.net/forum/showthr...999#post300999

    Inverter testing using old CFL:
    http://www.badcaps.net/forum/showthr...er+testing+cfl

    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
    http://s807.photobucket.com/user/budm/library/

    TV Factory reset codes listing:
    http://www.badcaps.net/forum/showthread.php?t=24809

    Comment

    • quiggy
      Senior Member
      • Aug 2014
      • 136
      • United Kingdom

      #3
      Re: Multimeter problem

      Yeah, I had it set to AC and 1000 volts, I can get a picture sorted for tomorrow. The meter still comes on but the display is flickering and it shows random readings, continuity test also does nothing, it used to have an audible sound but not any longer.

      Comment

      • stj
        Great Sage 齊天大聖
        • Dec 2009
        • 30927
        • Albion

        #4
        Re: Multimeter problem

        open it and look for burn marks.

        Comment

        • quiggy
          Senior Member
          • Aug 2014
          • 136
          • United Kingdom

          #5
          Re: Multimeter problem

          I had it open earlier, I didn't see any visible damage, anyway I'll post pictures later.

          Comment

          • retiredcaps
            Badcaps Legend
            • Apr 2010
            • 9271

            #6
            Re: Multimeter problem

            Originally posted by quiggy
            I had it open earlier, I didn't see any visible damage, anyway I'll post pictures later.
            If it is a name brand good quality meter, there is a possibility that the front end input protection did its job and saved you and meter from harm.

            Testing the input protection components is fairly easy with another working meter and replacement parts can be found.

            Good clear focused pictures of the make, model and pcb (both sides) will help.

            Dave Jones did a video on input multimeter protection.

            http://www.eevblog.com/2012/10/19/ee...tion-tutorial/
            --- begin sig file ---

            If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

            We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

            Please do not post inline and offsite as they slow down the loading of pages.

            --- end sig file ---

            Comment

            • quiggy
              Senior Member
              • Aug 2014
              • 136
              • United Kingdom

              #7
              Re: Multimeter problem

              Pictures of my meter, i can get close ups if needed
              Attached Files

              Comment

              • vinceroger69
                Badcaps Legend
                • Mar 2012
                • 6714
                • uk

                #8
                Re: Multimeter problem

                looks like you had it on dc volts then but was testing ac volts acording to ur post 1 maybe the white fuse has blown have you got a spare multi meter you can borrow to test the fuse.your post 3 says you had it on ac 1000v but looks like ac volts goes to 700 volts did you have it on ac symbol?
                Last edited by vinceroger69; 12-12-2014, 09:04 AM.

                Comment

                • stj
                  Great Sage 齊天大聖
                  • Dec 2009
                  • 30927
                  • Albion

                  #9
                  Re: Multimeter problem

                  the coil between the fuses looks cooked, the diodes near the probe sockets need a better look.
                  the tiny resistor or whatever it is to the right of the rotary wsitch looks fucked,
                  and i think that's a low battery warning on the display.

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #10
                    Re: Multimeter problem

                    I would check D1~D4.
                    Wht position of the selector switch was it in when you were trying to measure the AC line?
                    Never stop learning
                    Basic LCD TV and Monitor troubleshooting guides.
                    http://www.badcaps.net/forum/showthr...956#post305956

                    Voltage Regulator (LDO) testing:
                    http://www.badcaps.net/forum/showthr...999#post300999

                    Inverter testing using old CFL:
                    http://www.badcaps.net/forum/showthr...er+testing+cfl

                    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                    http://s807.photobucket.com/user/budm/library/

                    TV Factory reset codes listing:
                    http://www.badcaps.net/forum/showthread.php?t=24809

                    Comment

                    • quiggy
                      Senior Member
                      • Aug 2014
                      • 136
                      • United Kingdom

                      #11
                      Re: Multimeter problem

                      Looking at it now it was probably an oversight on my part with 1000v dc and 700ac being 1 click away from each other. So totally my fault lol

                      Comment

                      • vinceroger69
                        Badcaps Legend
                        • Mar 2012
                        • 6714
                        • uk

                        #12
                        Re: Multimeter problem

                        Originally posted by quiggy
                        Looking at it now it was probably an oversight on my part with 1000v dc and 700ac being 1 click away from each other. So totally my fault lol
                        Yes ive been there done that myself with my first ever multi meter ive learnt to double check now.

                        Comment

                        • quiggy
                          Senior Member
                          • Aug 2014
                          • 136
                          • United Kingdom

                          #13
                          Re: Multimeter problem

                          Feel like quite the idiot. Ill replace the meter rather than attempt repairs, it was pretty old anyway

                          Comment

                          • stj
                            Great Sage 齊天大聖
                            • Dec 2009
                            • 30927
                            • Albion

                            #14
                            Re: Multimeter problem

                            i prefer Auto-Ranging meters, far less to fuckup on those.

                            Comment

                            • vinceroger69
                              Badcaps Legend
                              • Mar 2012
                              • 6714
                              • uk

                              #15
                              Re: Multimeter problem

                              Originally posted by stj
                              i prefer Auto-Ranging meters, far less to fuckup on those.
                              Yes thats what i got after my misshap i still have a manual range one too though.

                              Comment

                              • R_J
                                Badcaps Legend
                                • Jun 2012
                                • 9514
                                • Canada

                                #16
                                Re: Multimeter problem

                                Is it possible you had the probes pluged into the amp (A) or(10A) instead of the voltage (V Ω) when you measured the Voltage, that would do it.

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA

                                  #17
                                  Re: Multimeter problem

                                  Auto range is not going to solve the AC/DC wrong setting. He was 1000VDC and still blew up by 230VAC (648V P-P).
                                  Last edited by budm; 12-12-2014, 10:03 AM.
                                  Never stop learning
                                  Basic LCD TV and Monitor troubleshooting guides.
                                  http://www.badcaps.net/forum/showthr...956#post305956

                                  Voltage Regulator (LDO) testing:
                                  http://www.badcaps.net/forum/showthr...999#post300999

                                  Inverter testing using old CFL:
                                  http://www.badcaps.net/forum/showthr...er+testing+cfl

                                  Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                                  http://s807.photobucket.com/user/budm/library/

                                  TV Factory reset codes listing:
                                  http://www.badcaps.net/forum/showthread.php?t=24809

                                  Comment

                                  • retiredcaps
                                    Badcaps Legend
                                    • Apr 2010
                                    • 9271

                                    #18
                                    Re: Multimeter problem

                                    Originally posted by quiggy
                                    Feel like quite the idiot. Ill replace the meter rather than attempt repairs, it was pretty old anyway
                                    Good quality meters will survive any "oops" moment and protect the user and itself.

                                    If you are not going to try and fix, I won't make any suggestions.
                                    Last edited by retiredcaps; 12-12-2014, 05:50 PM.
                                    --- begin sig file ---

                                    If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

                                    We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

                                    Please do not post inline and offsite as they slow down the loading of pages.

                                    --- end sig file ---

                                    Comment

                                    • quiggy
                                      Senior Member
                                      • Aug 2014
                                      • 136
                                      • United Kingdom

                                      #19
                                      Re: Multimeter problem

                                      I'd probably need to purchase another meter to repair this one, wouldn't I? It just seemed to make sense to just grab another if I were having to buy one regardless lol

                                      Comment

                                      • SteveNielsen
                                        Retired Tech
                                        • Jun 2012
                                        • 2327
                                        • USA

                                        #20
                                        Re: Multimeter problem

                                        Mistakes happen to everyone. When these happen I am thankful it was not my body that took on the damages and that I learned something.

                                        It definitely makes sense to get another meter. If you repair the old one that's great, it's better to have two meters than none. Sometimes it's good to be able to check voltage and current at the same time.
                                        Last edited by SteveNielsen; 12-14-2014, 12:45 PM.

                                        Comment

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