Tommy L
100 kW
BlackArrow said:
You are my Hero Black Arrow!
Thank you for sharing location/picture! Check out that thread with the 18gauge harness
Tommy L sends....
My BC168 Charger went POOF!
- Thread starter Tommy L
- Start date
You are my Hero Black Arrow!
Thank you for sharing location/picture! Check out that thread with the 18gauge harness
Tommy L sends....
dnmun
1 PW
the coil is on the other side from these mosfets and connected where those soldered legs show?
the mosfets switch current to ground from the coil and the output of the coil secondary goes through those diodes above?
the mosfets switch current to ground from the coil and the output of the coil secondary goes through those diodes above?
Tommy L
100 kW
dnmun said:
It appears that the Fets parallel thru 3 taps of the coil. Then it looks like the secondary of coil traces over to a 14 pin IC.
dnmun
1 PW
nope, the output of the windings will go into the schottky diodes just above.
there will be a gate signal for the mosfets from the controlling IC.
you should measure continuity across that surface mount ceramic cap there too in case it was damaged by the flames shooting out of the mosfet.
the other side of that cap is the voltage that is switched through the coils i bet. you should see the voltage on the other end of the cap from the ground across the bottom there.
the coil may be shorted internally too. see if you can compare resistance with the others there.
there will be a gate signal for the mosfets from the controlling IC.
you should measure continuity across that surface mount ceramic cap there too in case it was damaged by the flames shooting out of the mosfet.
the other side of that cap is the voltage that is switched through the coils i bet. you should see the voltage on the other end of the cap from the ground across the bottom there.
the coil may be shorted internally too. see if you can compare resistance with the others there.
Tommy L
100 kW
The vendor is willing to send me a new one if I return the old one. I will see what the shipping charges are
before I go any further
Tommy L sends....
before I go any further
Tommy L sends....
dnmun
1 PW
ask them to let you fix it and you pay shipping for them to send a replacement. tell them to include a buncha those SMT mosfets too.
tell them their reputation is at stake. explain that buyers will be concerned about this since the problem has appeared on several chargers, and if you can show it is an easy fix, then it would give the prospective buyers confidence.
make sure they know "the whole world is watching" and they may never sell another charger again if you cannot show this is easy to fix.
or tell them you will send positive feedback, and if the attempt to repair it is unsuccessful then the charger remains will be donated to our local charity, spare parts.
it was not your fault. they owe you a new charger and should cover shipping too. that will be the refrain, "never surrender, the whole world is watching".
tell them their reputation is at stake. explain that buyers will be concerned about this since the problem has appeared on several chargers, and if you can show it is an easy fix, then it would give the prospective buyers confidence.
make sure they know "the whole world is watching" and they may never sell another charger again if you cannot show this is easy to fix.
or tell them you will send positive feedback, and if the attempt to repair it is unsuccessful then the charger remains will be donated to our local charity, spare parts.
it was not your fault. they owe you a new charger and should cover shipping too. that will be the refrain, "never surrender, the whole world is watching".
Hi Tommy,Tommy L said:The vendor is willing to send me a new one if I return the old one. I will see what the shipping charges are
before I go any further
Tommy L sends....
Watching this, would like one of these but a few have burnt out now,not sure if they are worth the risk. how much has it cost you to get a warranty replacement.
Tommy L
100 kW
Emoto said:Hi Tommy,Tommy L said:The vendor is willing to send me a new one if I return the old one. I will see what the shipping charges are
before I go any further
Tommy L sends....
Watching this, would like one of these but a few have burnt out now,not sure if they are worth the risk. how much has it cost you to get a warranty replacement.
Hello Emoto!
$20 from Canada back to China on a slow boat. Air was $80.00. Might as well buy a new one if you send it back by air. Looks
like this will be a month or two before this gets resolved. Any electronic equipment can go poof. I really like this method of charging each parallel
cell group. It's fast. Bulk charge, then top off with one of the BC168's.
Tommy L sends....
dnmun
1 PW
you can buy a lot of those little schottky diodes on ebay for $20. the other guy myzter who had this happen just tossed his in the trash. they just get hot, really hot, when carrying a lot of current. that is the life of a schottky diode.
[/quote] Tommy L
Hello Emoto!
$20 from Canada back to China on a slow boat. Air was $80.00. Might as well buy a new one if you send it back by air. Looks
like this will be a month or two before this gets resolved. Any electronic equipment can go poof. I really like this method of charging each parallel
cell group. It's fast. Bulk charge, then top off with one of the BC168's.
Tommy L sends....[/quote]
20 buck is good, i would do the same, even if you managed to get it going again how long would it go for/ what else has been compromised ect.
I have got one from a member, its not obvious like yours no real signs, 2nd channel reading is weird and 4th channel is out.
Is thats the diagnosis '' schottky diodes ''
Hello Emoto!
$20 from Canada back to China on a slow boat. Air was $80.00. Might as well buy a new one if you send it back by air. Looks
like this will be a month or two before this gets resolved. Any electronic equipment can go poof. I really like this method of charging each parallel
cell group. It's fast. Bulk charge, then top off with one of the BC168's.
Tommy L sends....[/quote]
20 buck is good, i would do the same, even if you managed to get it going again how long would it go for/ what else has been compromised ect.
I have got one from a member, its not obvious like yours no real signs, 2nd channel reading is weird and 4th channel is out.
Did i miss some thingdnmun said:
Is thats the diagnosis '' schottky diodes ''
dnmun
1 PW
that's about all that can burn up on them. unless a cap blew open.
Tommy L
100 kW
lets keep this thread going!
Thank you all for your input!
Tommy L sends....
Thank you all for your input!
Tommy L sends....
dnmun
1 PW
now i remember this thread. that mosfet. i had to go reread it, after thinking it was the schottky diode that blew up. that mosfet is switching the current for the inductor on the other side.
so maybe someone will work up the courage to order 25 to get the cost down and then share them out by mail. mouser has a cheap shipping option if you ask for it but it is still $5.
so maybe someone will work up the courage to order 25 to get the cost down and then share them out by mail. mouser has a cheap shipping option if you ask for it but it is still $5.
dnmun said:
So we cant be sure really, depending on how far tommys retailer looks into it,[ detailed or just plug it in not working send a replacement job] we might lear something.
i would like this as a simple complete charging solution personally, after a few years of rc i only look at cell voltages and one set of leads per sub pack for charging sounds pliss
i think this is the only BC-168 trouble shoot thread.
whereswally606
100 kW
So blew both my bc168s last night since I forgot to disconnect my two 6s subpacks before attaching them. Now I get long beeps on attaching the charger probably because some of the readings of the cells is 0v and some not and not in order also one of the voltage readings is way out verified with a cell log. Thankfully the battery survives as did I but I was left feeling rather stupid. Like skeetab I bought mine from two separate vendors at different times I've contacted them both for help fingers crossed. Looked inside the worst affected one which has 3 null volt readings but saw nothing obvious.
dnmun
1 PW
you mean the display on the charger read 0V on several channels but not all of them? but the cells all are charged up?
there may be some type of multiplexer chip that takes the individual cell voltages and feeds that voltage signal to the processor that displays the voltages. so if the charger was overvolted on the chips that do that then they might have blown up.
there may be some type of multiplexer chip that takes the individual cell voltages and feeds that voltage signal to the processor that displays the voltages. so if the charger was overvolted on the chips that do that then they might have blown up.
whereswally606
100 kW
Yes dnmun that's what I meant. I defo over volted it due to my charging workflow gone wrong.
whereswally606
100 kW
Wonder if its possible to replace those multiplexer chips?
TheBeastie
1 MW
I had a 0 volt problem on my BC168 I replaced the main balance cable that comes out of the BC168 to the balance board and it was all good again, was just a kind of stealthy overly BBQed wire in the balance cable. I never shorted anything though just tried to charge too many batteries at once at 8amps.
Just sending a reminder to make sure you check the basics before digging too deep.
Just sending a reminder to make sure you check the basics before digging too deep.
whereswally606
100 kW
Thanks beastie great thought but i already checked continuity on the jst connectors as it was my first hopeful thought. Would have been nice if they had have acted as the fuse but i fear my blunder was more costly than that.
HK hobbyking sells 1-6 jst connector they are like fuses, i screwed two cables forgetting i had two packs in series. haha SMOKE, but still a fuse. I guess it wont be pretty with a fused board aint it the weakest link going first inside battery or small thing inside the charger... but 1-6 jst connector is the weakest link if its in the calculation. :wink:whereswally606 said:
meelis11
100 W
Has anyone succesfully repaired BC168 where IRF7832 chip needed a replacement.
I have same problem and I am waiting 5pc of IRF7832 from ebay.
I have same problem and I am waiting 5pc of IRF7832 from ebay.
nechaus
100 kW
meelis11 said:
Only the balance leads on mine,
Iv had a couple blow up, im done with them, im switching back to icharge, going for the double 2kw
The bc168 are great, but way to unreliable, they blow up without user error at times,
To many fires have started using these charges, im done
meelis11
100 W
nechaus said:
Can you point to topics where these chargers were used when fire started? All fires I know were using LiPo and bulk charging.
meelis11
100 W
I will post some pict too - both those channel 2 IRF7832 power mosfets were bad. Replaced them and tested charging at minimum 0.1A, it worked!
Then gradually increased 0.2A - 0.5A and touched mosfets with my finger. Channel 2 mosfets were getting hot again! When it get hot, I pushed cancel charge button. Made few test and charger broke again - it was shorted inside and triggered power supply safety cut-off. I unsoldered these mosfets and charger is working again (not shorted inside) but without channel 2.
So obviously there is some other component that is bad and is causing mosfets to heat and fail in shorted state. Can anyone give some advice?
Then gradually increased 0.2A - 0.5A and touched mosfets with my finger. Channel 2 mosfets were getting hot again! When it get hot, I pushed cancel charge button. Made few test and charger broke again - it was shorted inside and triggered power supply safety cut-off. I unsoldered these mosfets and charger is working again (not shorted inside) but without channel 2.
So obviously there is some other component that is bad and is causing mosfets to heat and fail in shorted state. Can anyone give some advice?
