Author Topic: EEVblog #884 - EEVBlog BM235 Multimeter REPAIR  (Read 22813 times)

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Offline GEuser

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Re: EEVblog #884 - EEVBlog BM235 Multimeter REPAIR
« Reply #50 on: June 01, 2016, 01:18:39 pm »
That's a good thing there .
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Offline iromero

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Re: EEVblog #884 - EEVBlog BM235 Multimeter REPAIR
« Reply #51 on: June 01, 2016, 03:32:29 pm »
Brymen have investigated it, report attached.

That report is awesome, exactly what you would expect from a manufacturer with a quality system in place. Gives even more confidence on the brand.
« Last Edit: June 01, 2016, 03:34:43 pm by iromero »
 

Offline Vgkid

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Re: EEVblog #884 - EEVBlog BM235 Multimeter REPAIR
« Reply #52 on: June 01, 2016, 04:43:19 pm »
Nice job by Brymen.
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Offline bitwelder

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Re: EEVblog #884 - EEVBlog BM235 Multimeter REPAIR
« Reply #53 on: June 01, 2016, 05:40:56 pm »
Good job Brymen also in allowing to share the report (I guess Dave got permission to publish).

Can somebody re-explain in simple English what does it mean that "L3 was soldered to left trend"?
 

Offline Wytnucls

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Re: EEVblog #884 - EEVBlog BM235 Multimeter REPAIR
« Reply #54 on: June 01, 2016, 06:03:02 pm »
I think Brymen means to say that if the L3 solder is intruding slightly in the left post circular opening, the solder joint could get damaged during meter assembly or disassembly.
« Last Edit: June 01, 2016, 06:05:09 pm by Wytnucls »
 

Offline jitter

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Re: EEVblog #884 - EEVBlog BM235 Multimeter REPAIR
« Reply #55 on: June 01, 2016, 06:41:19 pm »
I think Brymen means to say that if the L3 solder is intruding slightly in the left post circular opening, the solder joint could get damaged during meter assembly or disassembly.

That's indeed what they're saying. They are also proposing a check for existing finished stock and a workaround for work in progress and a permanent fix for the long term.
However, looking back at Dave's video, it is clearly visible that the inductor is perfectly placed on the pads without any shift to the left or the right. It's mainly a design issue that the long term fix should solve.

What they did not go into were the other things remarked here:
- a lot of residue under L3/solder quality;
- weakness of the board in that area;
- undersized L2.
« Last Edit: June 01, 2016, 06:55:15 pm by jitter »
 

Offline Flipflop

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Re: EEVblog #884 - EEVBlog BM235 Multimeter REPAIR
« Reply #56 on: June 01, 2016, 06:50:38 pm »
I'll give Dave and Brymen full marks for being open and honest about this. At least it has been recognised and addressed as a design/assembly problem.
 

Offline retiredcaps

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Re: EEVblog #884 - EEVBlog BM235 Multimeter REPAIR
« Reply #57 on: June 01, 2016, 09:43:28 pm »
Thick heat shrink over PTCs and VDRs is a common practice. If you push these parts too hard they can fail explosively and rip right through a case. Restraining them at source greatl reduces the damage they can do.
Speaking of the above.  See pics of PTC in heatshrink at

https://www.eevblog.com/forum/repair/brymen-bm869-meets-high-voltage-in-real-world/
 

Offline jesuscf

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Re: EEVblog #884 - EEVBlog BM235 Multimeter REPAIR
« Reply #58 on: June 04, 2016, 03:45:45 pm »
I good job will include the part numbers for both L2 and L3.

Good job Brymen also in allowing to share the report (I guess Dave got permission to publish).
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Online jancumps

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Re: EEVblog #884 - EEVBlog BM235 Multimeter REPAIR
« Reply #59 on: June 04, 2016, 03:52:41 pm »
I good job will include the part numbers for both L2 and L3.

Good job Brymen also in allowing to share the report (I guess Dave got permission to publish).

Why? That doesn't add or take away from the report.
 

Offline ornea

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Re: EEVblog #884 - EEVBlog BM235 Multimeter REPAIR
« Reply #60 on: June 06, 2016, 11:17:50 am »
Was just going thru the manual.  Looking at the hires teardown photos included it appears L2 has a crack.  Can't be 100% sure.
 

Offline ornea

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Re: EEVblog #884 - EEVBlog BM235 Multimeter REPAIR
« Reply #61 on: June 06, 2016, 11:41:53 am »
I good job will include the part numbers for both L2 and L3.

Good job Brymen also in allowing to share the report (I guess Dave got permission to publish).

Why? That doesn't add or take away from the report.
True. But it does make it easier for people wanting to do their own repair if required.
« Last Edit: June 06, 2016, 03:58:59 pm by ornea »
 

Offline ornea

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Re: EEVblog #884 - EEVBlog BM235 Multimeter REPAIR
« Reply #62 on: June 06, 2016, 01:56:44 pm »
Brymen have investigated it, report attached.

That report is awesome, exactly what you would expect from a manufacturer with a quality system in place. Gives even more confidence on the brand.
Adequate report would be my take on it.
 

Offline Flipflop

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Re: EEVblog #884 - EEVBlog BM235 Multimeter REPAIR
« Reply #63 on: June 06, 2016, 06:03:33 pm »
Was just going thru the manual.  Looking at the hires teardown photos included it appears L2 has a crack.  Can't be 100% sure.

If you zoom in there is something there on L2, not sure if it's a crack or just some mark.
 

Offline imidis

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Re: EEVblog #884 - EEVBlog BM235 Multimeter REPAIR
« Reply #64 on: June 07, 2016, 07:09:20 pm »
Received mine today, seems to work quite well, haven't taken it apart to have a look at l2 l3 yet.

For anyone else from Canada, got charged PST, GST, and 9.95 to determine there was taxes and no duty on it, $25 cad total for that.
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Offline timofonic

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Re: EEVblog #884 - EEVBlog BM235 Multimeter REPAIR
« Reply #65 on: June 07, 2016, 10:48:00 pm »
Can this model be distributed in Europe?
 

Offline drussell

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Re: EEVblog #884 - EEVBlog BM235 Multimeter REPAIR
« Reply #66 on: June 08, 2016, 12:57:52 am »
Received mine today, seems to work quite well, haven't taken it apart to have a look at l2 l3 yet.

For anyone else from Canada, got charged PST, GST, and 9.95 to determine there was taxes and no duty on it, $25 cad total for that.

That sounds about right....

For Canada Post, they charge a minimum of $5 for the "fee to clear it through customs" if it is more than a few dollars value of actual product (if it is less than some small minimum value of about $20, they usually just let it through un-charged) and then that base fee goes up depending on the actual declared value of the item. 

Add the 5% GST (and for any province other than here in Alberta, add your tragic PST %) and you've got your import charge...

(Although sadly, of course, with our atrocious new NDP government here, we'll probably have a #*?&@%$FrickyFracken#*$%@&?*#! provincial sales tax here too soon enough...  :palm:  but I digress...)
 

Offline EEVblog

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Re: EEVblog #884 - EEVBlog BM235 Multimeter REPAIR
« Reply #67 on: June 08, 2016, 03:20:32 am »
Was just going thru the manual.  Looking at the hires teardown photos included it appears L2 has a crack.  Can't be 100% sure.

Nope, just some marks.
 

Offline imidis

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Re: EEVblog #884 - EEVBlog BM235 Multimeter REPAIR
« Reply #68 on: June 08, 2016, 11:08:29 am »

That sounds about right....

For Canada Post, they charge a minimum of $5 for the "fee to clear it through customs" if it is more than a few dollars value of actual product (if it is less than some small minimum value of about $20, they usually just let it through un-charged) and then that base fee goes up depending on the actual declared value of the item. 

Add the 5% GST (and for any province other than here in Alberta, add your tragic PST %) and you've got your import charge...

(Although sadly, of course, with our atrocious new NDP government here, we'll probably have a #*?&@%$FrickyFracken#*$%@&?*#! provincial sales tax here too soon enough...  :palm:  but I digress...)

We all will have HST in the end one day  :palm:

Yeah, 7%, so that was 8 and some change, on the plus side, they undervalued it slightly, exchange maybe?


On another note, I did take it apart and check out L3, L2 on mine, looks good.   :)
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Offline hugatry

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Re: EEVblog #884 - EEVBlog BM235 Multimeter REPAIR
« Reply #69 on: November 18, 2018, 03:01:14 pm »
Here is a picture of newer board revision. L3 has been repositioned so that it won't end up sandwitched between PCB and plastic post on the rear half of the case.
This kind of fix was mentioned in the report shared by Dave, but here is an actual photo... Just so everyone knows this problem got fixed sometime during last two years.

This is actually Brymen BM231, but AFAIK PCBs are the same for all models in BM230 series.


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