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Looking at a faulty returned BM786 multimeter.
Warning: Some components were harmed in the making of this video.
Forum: https://www.eevblog.com/forum/blog/eevblog-1520-troubleshooting-a-faulty-bm786-multimeter/
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#ElectronicsCreators #Repair #Multimeter

By YTB

21 thoughts on “Eevblog 1520 – troubleshooting a faulty bm786 multimeter”
  1. Avataaar/Circle Created with python_avatars Miles Finch says:

    Why can't Aussies say "daaaaaata" correctly!!?? 😉

  2. Avataaar/Circle Created with python_avatars Lincoln Worsham says:

    I will tend to use a very sharp razor to trim the film to the window.

  3. Avataaar/Circle Created with python_avatars Davie Jay says:

    Having an issue with 2 multimeters at work
    I’m in a mechanical trade, meters used mostly for 12v stuff

    Two of my bosses meters have the same problem, when on dc voltage it shows increasing values when the probes haven’t even touched anything yet
    It’s a bit annoying.. but if I touch the probes together the values decrease down to 0 then I can check whatever voltages I need to check
    And it’s accurate, doesn’t change at all when reading a voltage source

    I assume someone (probably me) put a load on it somehow

    They’re not worth fixing, but I’d like to know what the problem is exactly so I can avoid it in the future

  4. Avataaar/Circle Created with python_avatars benjamin vivar says:

    I bought. a BM786 Multimeter a week ago
    The white plastic contact range switch or
    The brass contact range pin are out of specifications.
    Issue was when I turned the contact switch to different meter functions
    the meter would turn off and restart or change unwontedly to a different function.

    So me knowingly, knowingly knowing, that Im a mechanical genius
    Intuitively discerning a faulty design, propagated
    By a self promoted perfectionist mind.
    Decided the meager challenge, “ Dam-it Im gonna fix my multimeter.”
    Assessing the problem cause and effect
    Contact range wibble and wobble
    Wobble and wibble
    Under her skirt teeny tiny contacts
    She must be a tease ?
    Immediately I cut 1/8 of an inch * 4
    Off the wire tie, that holds The Test Leads
    Place them in the white plastic contact range
    Where brass pin enters.
    And not to my surprise, the BM786 Multimeter
    Good as new.
    Let this be a lesson to you
    That is why Fluke meters are expensive…
    😊

  5. Avataaar/Circle Created with python_avatars TheEPROM9 says:

    Bodge it on there the same way I would.

    It's good to show the failiurs, after all failure is a teecher & one should not deprive the people of his lessons.

  6. Avataaar/Circle Created with python_avatars Pineapple road says:

    I had a tablet (android), which i used for a few years without realising there was film on the screen

  7. Avataaar/Circle Created with python_avatars Nikhil Praveen says:

    "Warning: Some components were harmed in the making of this video" LOL.

  8. Avataaar/Circle Created with python_avatars FISHERMAN33RUS says:

    Does "Crest" and "Rec" functions work correctly in this multimeter? Then I am measuring 12V battery it shows 0,2В more then in DCV mode in my 869S

  9. Avataaar/Circle Created with python_avatars CountParadox says:

    I have a failed BM235, should I send it in? 🙂

    I replaced it with a 117, but I do miss the 235…

  10. Avataaar/Circle Created with python_avatars Lee Studley says:

    C107 and C101 look like them new fangled zero ohm capcitatorizersistors thingys, but another online image of the PCB's of this meter shows the same so it's probably a BOM item replacement fix.

  11. Avataaar/Circle Created with python_avatars Lee Studley says:

    Does the button mezzanine need to be in place? Are signals jumpered across the connectors?

  12. Avataaar/Circle Created with python_avatars naikrovek says:

    Dave blames the mythical "Murphy" a lot when the problem is actually "Dave" and his rusty diagnostic skills. We all get rusty if we don't do the diagnostics work frequently. Dave makes videos now, so I'm not making any attempt at criticism, it's just reality. This is why a lot of places have a dedicated diagnostics person, or team, even for reversing competitor gear.

  13. Avataaar/Circle Created with python_avatars Fun Cool says:

    Очередная китайская недоделанная игрушка.

  14. Avataaar/Circle Created with python_avatars Dan Jackson says:

    as a software guy who's hardware-curious, I was surprised by how seldom Dave referred to his known-good unit to check his understanding.

  15. Avataaar/Circle Created with python_avatars ReeDreamer says:

    I could watch Dave probe meters all day ; )

  16. Avataaar/Circle Created with python_avatars carkawala khatulistiwa says:

    Electric Trolley bus vs electric battery bus

  17. Avataaar/Circle Created with python_avatars Amiga Wolf says:

    Very strange that you sell a product with your brand name on it, but do not have the schematic for it??????

  18. Avataaar/Circle Created with python_avatars Jonn Scott says:

    @EEVblog Merry Christmas , thanks for the years education & entertainment .

  19. Avataaar/Circle Created with python_avatars Brian Richmond says:

    I would have powered the microprocessor chip directly with no other power applied to see what would happen. No loss if it blows up because it is now junk anyway.

  20. Avataaar/Circle Created with python_avatars ZKH Prins Sven Olaf van CyberBunker-Kamphuis says:

    in order to get them to realize the film is part of the packaging, not of the product itself, and needs to be removed before use just print something all over it 😛 preferably something that does not represent stuff that would normally be on the display while on or they will go 'i can't switch it off' 😛

  21. Avataaar/Circle Created with python_avatars EEVblog says:

    LOL. EVERYONE including myself missed a major goof in this video. Can you spot it? It's not the fault, but it's something I was wrongly assuming. I can't believe not a single viewer picked me up on it!

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