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Old Aug 20, 2013, 06:50 PM
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Killed HK charger Accucel-6. Where to buy Power FET 'DTM4420', or find replacement?

Hi, this is my first post. Im new to the RC world, building a tricopter (rcexplorer.se), waiting for TH9x transmitter => 0s flighttime

Looks like I killed my charger (Turnigy Accucel-6 50W charger).. I accidentally touched the '+', from the LiPo battery, to the chassis of my PC PSU ('-'). The charger made a 'pop' sound, and is dead.
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Description:


Overview of the insides:
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Description: Inside of Turnigy Accucel 6 50W


Doing the "smell" test, I found a IC that is clearly broken (DTM4420 DC50M). The 'hole' is also a giveaway .
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Description: Broken IC on 'input' side
(The 4 top legs, are terminated directly to '-' from the input. The bottom right leg, has a 2.4ohm resistor between itself and input '-'.)


This is a identical IC, but located on the output side of the charger (how I know the 'DC50M' part, its burned away on the defective IC).
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Description: IC on 'output' side


Think I have found some datasheets for the IC:
http://www.alldatasheet.com/datashee...K/DTM4420.html
http://www.daysemi.jp/Upload/Product...et/DTM4420.pdf


Need help to find a replacement Power FET. Have tried to find a replacement, but I'm unsure how accurate the specs has to match:
https://www.elfa.se/elfa3~eu_en/elfa...-8&pageSize=10



There could be other components that are damaged, but I cant see any. I want to try to fix this instead of just ordering a new charger.

Any help or words of wisdom would be highly appreciated!
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Last edited by Hareide; Aug 23, 2013 at 07:59 AM. Reason: Changed from link to "english" version of site, fixed some. Changed title to give a better description.
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Old Aug 23, 2013, 11:46 AM
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3 year old thread with solution, replace Power FET with IRF7413PBF

Found a 3 year old thread:
Turnigy Accucel-6 brokem. HELP-ME

It recommends replacing the broken IC with:
IRF7413PBF
IRF7413PBF Datasheet

But its kind of missing the confirmation that the replacement was successful. I will try this anyway, at best it gives me a chance to work on my (lacking) soldering skills.
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Old Oct 19, 2013, 11:56 AM
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Power FET replaced, charger working again

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Old IC has been removed and replaced with "IRF7413PBF". Its not pretty, but it works.

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My china multimeter agrees with the displayed voltage after replacement.

At this point I have charged 3 batteries, seems to be working like normal. Guess I also should have measured that displayed current is correct, but I didn't do that.

Good luck to next one that has the same issue. Hopefully you are as lucky as me, in my case the damage could be seen by the naked eye. Hopefully this didn't damage something else, I guess that time will tell..
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Old Oct 22, 2013, 11:25 AM
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Nice job!
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Old Mar 08, 2014, 01:24 AM
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the same happened to me this morning.....
damn power supply.... I should wrap the PS with something next time....

after searching a bit I came across this site...... very good info here.

my chip doesn't have any visible burn marks, but that burn-smell is just there where that chip is.

one question:

is this charger still working after the repair??
(maybe because it's not exactly the same chip, and/or there were more burned components that didn't show up initially.)
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Old Apr 06, 2014, 12:46 AM
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just to confirm.....

I too changed that chip and my charger is working again!!!

thank you.
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Old Mar 19, 2015, 09:08 AM
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ya me to....on my
IMAX B6-AC
got them from RS
RS Stock No. 543-2468
hv fun
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Last edited by Shaky Shot; Mar 19, 2015 at 09:15 AM.
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Old Mar 19, 2015, 12:24 PM
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There are countless different MOSFETs that would make a good replacement. For anyone else doing this, simply look up the datasheet and then find a part with similar or better specs. Suppliers like Digikey, Mouser and others have parametric search that you just enter the specs you need and it lists the parts that match.
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Old Aug 03, 2015, 11:54 AM
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number ic

hi friends
im from iran
what ic number in down pictures?
(imax b6)
http://upload7.ir?p=action&q=downloa...pP8kwyTgCpDqc5
http://upload7.ir?p=action&q=downloa...EDWJrUUSN9U84u
http://upload7.ir?p=action&q=downloa...m4xDa9axfPxnMT
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