slot #2 error on "Upgraded Miboxer C4-12" (got replacement unit..)

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lacrimal
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hammerJoe wrote:
I didnt open mine so I dont know what it looks like inside.

Miboxer told me that the fact that it didnt show the word ‘FULL’ when the cell was charged that it was faulty and to return it.
Have you noticed that with your V2 especially with NIMH that it doesnt really charge up to 1.50V? On my V2 it usually stops at around 1.38V.
Also it gets messed up with the IR numbers and just shows gibberish instead of numbers.

Looked especially for low voltage finish since several people here said it could be a problem, but no, mine (including slot #2 with reworked IC) charges same on all slots for example four new eneloops finish at 1.52V 0.75A 0.51-0.55mohm.When measured right after eject with multimeter it shows 1.49V. No garbage readings.

lacrimal
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Without surprise,
forced to replace second chip, this time on #1 slot same symptoms, same resolution, fortunately i have still 3 spare parts.
Anyway, beside this charger work great when not broken, I’m not recommending miboxer c4-12 upgrade to any end user not familiar with hot air smd montage.

Sidney Stratton
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Sorry to revive an old thread but yesterday my MiBoxer C4-12 slot #1 died.

Bought it some 18 months ago; way past any warranty. tantien11 replaced ME3118A (edit: post #15).

eBay listing doesn’t ship Canada. However, AE has Link at ~10 $ shipping.

I’ll try my hand in replacing but what is the underlying failure of the regulator? Is it too weak or another component that overdrives the chip?

Bad phone camera but a picture of the innards. Which is the regulator? Yellow or Red? (I’d have to re-open the unit to check).

lacrimal
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Did not get notification for this so it is one year old – @Sidney Stratton did you tried replacement ?
I think you already now that ME 3118A are located horizontally (almost inline) with hugest capacitor on board.

Sidney Stratton
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Oh, this was some time ago. Trying to refresh my memory; edited my last post to reference tantien11 post #. (Originally posted Jan. 27th ’21)

I did get the regulators (5x) from AE and did a replacement of the ME3118A. Had some problems as these are solder sinked on the underside. There is no sign of such and being new with my heat gun, I tore off some of the traces. Out of my league for a newbie in SMD, I passed it to a friend which did all the work. It seems there was a capacitor that also failed and some resistors. The fellow re-built it all and is now working. He is very patient and so was I – 40 days in his shop.

This was August ’21. All-in-all this adventure took 7 months to be resolved.

Meanwhile, I ordered a Vapcell S4 Plus as I didn’t have much hope in reviving the charger. This one is much better in display crispness and has a discharge/charge capacity test – although I hadn’t used it.

I still use the MiBoxer on the occasional day, but I suspect it may die out again on some other channel. The root of the problem wasn’t found, and it seems this affected only a few unfortunate people. I don’t know what to make of the reliability of the product. It would seem they no longer make chargers. Perhaps too many faulty units? They had made upgrades and it wasn’t clear which version you got. And to add to the confusion, their naming scheme; C4, C4+, C4-12, C4-12+ (or something of that order, can’t recall the details).

So hopefully the Vapcell will outlive the MiBoxer. Much thanks for researching and pointing out the defective regulator. People like you are great at enlightening us newbies and are an encouragement in our endeavours.

And thanks for responding to my dilemma, although late but better than never.

lacrimal
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Indeed – it was some time ago – returned here to find some information about new flashlight and spotted year old notification. Don’t know why never found it in my mailbox.
Anyway I like things finalized so thanks for whole comment you gave.
Also looking to Miboxer page looks like they simply cutoff old story and go with Mi-light brand now (in my opinion mi light is comparable faulty as Miboxer chargers :-)).
Mine Miboxer get several faults from last year , but having spare parts , specialized in hot air montage so in 10 minutes it is back alive.Problem is that one ME3118A left and I I’m not planning to buy new 5 pieces because they are now incredible expensive so better to buy new charger :) Also have old UltraFire charger that still kicks and never fail :)

d_t_a
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lacrimal wrote:
Indeed – it was some time ago – returned here to find some information about new flashlight and spotted year old notification. Don’t know why never found it in my mailbox. Anyway I like things finalized so thanks for whole comment you gave. Also looking to Miboxer page looks like they simply cutoff old story and go with Mi-light brand now (in my opinion mi light is comparable faulty as Miboxer chargers :-)). Mine Miboxer get several faults from last year , but having spare parts , specialized in hot air montage so in 10 minutes it is back alive.Problem is that one ME3118A left and I I’m not planning to buy new 5 pieces because they are now incredible expensive so better to buy new charger :) Also have old UltraFire charger that still kicks and never fail :)

There seem to be 2 “Miboxer” websites now.

The Miboxer website (http://www.miboxer.com) doesn’t seem to list chargers.

But the Miboxer-charger website (http://www.miboxercharger.com/eng/index.html) lists their charger models, although there has not been any new models for some time now.

~~~~~~~~~

With regards to the issues experienced (chip burning out?), maybe this can be due to higher charging current (and maybe some component are not durable enough to last the higher charging current?).

I notice that an updated Miboxer C4-12 v2 (2-button version), now has a few changes with the Miboxer C4-12 v2.2 (2-button version). No noticeable physical difference between the C4-12 v2 and C4-12 v2.2. (“v2.2” is indicated in the manual, not on the charger)

The C4-12 v2 can auto select a very high charging current of 3.0 Amps when the detected IR is very low (regardless if it’s a smaller or bigger size/capacity battery)

The new change is that the “auto-charge-current” appears to be limited to 2.0 Amp charge rate, even when the IR is very low (ie. the charger will not auto-select 2.5Amp or 3.0Amp charge current (unlike in the v2). Max auto-charge current now limited to 2.0 Amps.

Another change is that with the v2.2, when cycling the “charge current, on the v2, can go from 0.1A to 3.0A to “A” (Automatic charge current). Whereas on the v2.2, there is not “A” (automatic charge current) when cycling through the charge current selection.

Could these changes be related to preventing too high charge current? (ie. 2.5Amp and 3.0Amp charge current can only occur when manually selecting charge current; unlike before where very high charge currents can be auto-selected if the IR is low enough.

lacrimal
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Seems you are correct, i have no other than protected cells now so can’t confirm with that. But any protected cell discharged enough blow chip. Also, when you put cell to charger and immediately go to manual – it is already blow off (tested twice).
Guess it is no way to change v2 behavior to act like v2.2 ? Looks like programmed behavior, for reverse engeniering – chip in mine has no name.

About their web page – miboxercharger – looks like an empty shell, not finished portfolio. Tried contact with them several times by main site and this one you get 404 error or no response at all.
Summarizing, better to go forward, i will replace the rest of ME3118A as they die until i have them. Will try buy better charger next time Smile

nick779
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(Sorry to necro an old thread)

Well crap, I have two of these and they’ve been reliable so far, but failing to 5v does NOT sit well with me. I haven’t been able to find anything else that offers all of the capabilities of this charger elsewhere….. =/

lacrimal
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nick779 wrote:
(Sorry to necro an old thread)

Well crap, I have two of these and they’ve been reliable so far, but failing to 5v does NOT sit well with me. I haven’t been able to find anything else that offers all of the capabilities of this charger elsewhere….. =/

Did you look at Vapcell S4 Plus, looks like functionally better than c12.
Also it is old enough to reveal already all cons but not seen any.

Automatic mode is selected ‘manually’ Smile

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