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

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

I decided to try out the new upgraded Miboxer C4-12 (2-button version).

  Just received the charger about a couple of weeks ago, and have been using it lightly only.

 

Suddenly the slot #2 displayed an error while I was starting to charge up some batteries today.

 

I did a little bit of troubleshooting by checking the voltage.

 

Slot #1, 3, 4 (the slots still working) have an open voltage (ie. when no battery is inserted) of 5.0 volts,

but the non-working slot #2 has an open voltage of 12 volts.

 

Video below shows my test:

 

Hopefully Miboxer can point out what is the problem and offer a solution.

Edited by: d_t_a on 08/19/2019 - 05:44
hank
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Yeek! Failing to a higher voltage is not good.

hasddie293
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Mine work fine on all slots…no err shown…
But I cannot be 100% sure, haven’t had a test…but will check later on… Shocked

In search of the most ideal flashlight in town:
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Mishanchik
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New Miboxer C4-12, use 2 weeks – all excellent.

Mishanchik
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Any news from Miboxer? Did they repair your device?

Petr J.
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Probably punctured the power output transistor.

d_t_a
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Mishanchik wrote:
Any news from Miboxer? Did they repair your device?

Sent video to Banggood, who has shipped out a replacement unit. Not sure if it’s the whole unit or just the charger… still in shipping status.

snakebite
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can it source any current through the cell in the error state?
if it is trying to charge at 12v this could get ugly.

Mishanchik
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d_t_a wrote:
Mishanchik wrote:
Any news from Miboxer? Did they repair your device?

Sent video to Banggood, who has shipped out a replacement unit. Not sure if it’s the whole unit or just the charger… still in shipping status.

Please, write on the result.

d_t_a
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Received replacement unit. Will need to try charging batteries to see if any errors still occur.

The unit that developed slot #2 error was originally functioning normally (I was trying testing different batteries, and they seem to charge properly), but the slot 2 error suddenly occurred. At first I thought I inserted battery incorrectly (reversed polarity will also show the same “C2 err” display), but when I double-checked, the battery was inserted properly, and the slot #2 suddenly developed that error, under normal usage scenario (only a few days test charging several batteries)..

Anyway, will still observe the replacement unit to see how it goes.. Appreciate all the responses.

I wonder if there’s a way to fix the “C2 Err” on the original unit…

snakebite
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its probably just an infant mortality failure.
as for a repair open it up and you should see 4 identical stages one at each position.
you are likely looking for a shorted mosfet.
and you have 3 good stages to look at and compare readings.