Author Topic: Brymen BM786 EEVBLOG version with 2mA of consumption (Battery Draining)  (Read 954 times)

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Offline davidt151Topic starter

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Is it Normal?

I bought this multimeter a year ago and I have found that it eats batteries like candy, looked the video "EEVblog 1533 - How To Estimate Product Battery Life" and hooked other multimeter to measure current consumption and found 2.68 mA when shut down

| Supply Voltage (V) | Current (mA) | Equivalent Impedance (Kohm)
             0.61                    0.47                            1.27
             1.51                    1.13                            1.33
             4.11                    2.68                            1.53

Tried measuring resistance across the battery terminals and found the same 1.8 Kohms in forward and backward measuring.

When saw "EEVblog 1449 - What Causes Excess Battery Drain? (BM235)" I started looking for components and my main suspect at the moment is the 100uF tantalum capacitor as I could no measure any capacitance in the terminals (measured in PCB), at the moment I am waiting for a hot tweezers before starting to make an intervention.

I think is a faulty capacitor and not the diode as it is a very consistent resistance, but I would like to know your opinion as I do not have a lot of experience with these things.
« Last Edit: November 01, 2023, 02:43:03 am by davidt151 »
 

Offline Fungus

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Re: Brymen BM786 EEVBLOG version with 2mA of consumption
« Reply #1 on: November 01, 2023, 01:14:41 am »
I think Dave's video is correct. The money has to be on the capacitors that are across the batteries.

OTOH I those capacitors shouldn't be tantalum. Are you looking at the right ones?
 

Offline davidt151Topic starter

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Re: Brymen BM786 EEVBLOG version with 2mA of consumption (Battery Draining)
« Reply #2 on: November 01, 2023, 02:55:04 am »
At the moment I have identified 3 elements that are in parallel with the batteries, a ceramic that measured 7uF, a tantalum that I could not measure and the diode that seems just fine, all elements are in the upper part of the image.

The images are taken from the EEVblog.
 

Offline Fungus

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Re: Brymen BM786 EEVBLOG version with 2mA of consumption (Battery Draining)
« Reply #3 on: November 01, 2023, 10:18:49 am »
Take that tantalum out, see what happens...
 


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