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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
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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/
Support the EEVblog on:
Patreon: http://www.patreon.com/eevblog
Web Site: http://www.eevblog.com
Other channels:
EEVblog2: http://www.youtube.com/EEVblog2
EEVdiscover: https://www.youtube.com/eevdiscover
T-Shirts: http://teespring.com/stores/eevblog
#ElectronicsCreators #Repair #Multimeter
Why can't Aussies say "daaaaaata" correctly!!?? 😉
I will tend to use a very sharp razor to trim the film to the window.
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
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…
😊
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.
I had a tablet (android), which i used for a few years without realising there was film on the screen
"Warning: Some components were harmed in the making of this video" LOL.
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
I have a failed BM235, should I send it in? 🙂
I replaced it with a 117, but I do miss the 235…
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.
Does the button mezzanine need to be in place? Are signals jumpered across the connectors?
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.
Очередная китайская недоделанная игрушка.
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.
I could watch Dave probe meters all day ; )
Electric Trolley bus vs electric battery bus
Very strange that you sell a product with your brand name on it, but do not have the schematic for it??????
@EEVblog Merry Christmas , thanks for the years education & entertainment .
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.
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' 😛
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!