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BrianG
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09.09.2008, 09:36 PM

You must have accidentally bridged a solder pad or two - easy to do when they are so small. Do you know what blew?
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George16
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09.09.2008, 10:50 PM

Quote:
Originally Posted by BrianG View Post
You must have accidentally bridged a solder pad or two - easy to do when they are so small. Do you know what blew?
I don't know the part name but here's a pic. Both are circled in red.



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joeling
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09.09.2008, 11:03 PM

Those look like SMD capacitors

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BrianG
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09.09.2008, 11:13 PM

Yeah, and I wonder if you had the BEC leads reversed (switched the + and -)? That's the only thing I can think of that would blow a cap, that and overvoltage.
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George16
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09.09.2008, 11:23 PM

I used an rx pack. It's a 6V hump pack. I had the wires from the ESC intact and plug in into channel 2 while the hump pack was plug into the battery port of my futaba rx.


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BrianG
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09.09.2008, 11:32 PM

Well, if the polarity was ok, I guess it could have been overvoltage. A 5-cell rx pack can be close to 7v right off the charger (~1.4v/cell). Usually, the caps have some sort of safety margin so I wouldn't think that would be it.

Unless the removal of the components wasn't quite done right and a couple pads were bridged putting the full battery voltage on the BEC line. That would definitely cause the rx pack to get hot, and the voltage would be high enough to pop those caps.

BTW: the larger device does look like a cap, but the upper one looks like it might have been either resistor, cap, diode, or any two-terminal device.

Last edited by BrianG; 09.09.2008 at 11:33 PM.
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TruckBasher
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09.09.2008, 11:36 PM

hmmmm I was using 5 cell pack also close to 7v after charging but it did not puff smoke and was alble to run for 15mins before it died....


Sorry to hear bout that Lito ......


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George16
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09.09.2008, 11:37 PM

Quote:
Unless the removal of the components wasn't quite done right and a couple pads were bridged putting the full battery voltage on the BEC line. That would definitely cause the rx pack to get hot, and the voltage would be high enough to pop those caps.
I'm leaning more towards this. It's really hard to see if there was any bridging. Heck it only takes a speck of solder bridge to components together and cause some damage.

The hump pack has about 6.5V when I check it with my Fluke.

Jeff, have you opened it up yet and see what happened inside?


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TruckBasher
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09.09.2008, 11:38 PM

Quote:
Originally Posted by George16 View Post
I'm leaning more towards this. It's really hard to see if there was any bridging. Heck it only takes a speck of solder bridge to components together and cause some damage.

The hump pack has about 6.5V when I check it with my Fluke.
Hehe this is why i suggested to use the utility knife or your surgical knife


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BrianG
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09.09.2008, 11:39 PM

Whatever the case, I hope CC still accepts the warranty for you.
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TruckBasher
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09.09.2008, 11:42 PM

hey Lito maybe we can send it together.... but i think they will not cover warranty...Anyone know how much will be the payment for no warranty?


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joeling
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09.09.2008, 11:45 PM

Ya, I would like to know too as I have 2 units that are void of warranty...

Quote:
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hey Lito maybe we can send it together.... but i think they will not cover warranty...Anyone know how much will be the payment for no warranty?
I heard from somewhere it's USD50 no questions asked but maybe this is only relevant to the MM. Can anyone confirm ?

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George16
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09.09.2008, 11:55 PM

Quote:
Originally Posted by joeling View Post
Ya, I would like to know too as I have 2 units that are void of warranty...

Regards,
Joe Ling
Did you do anything to them?


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joeling
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09.10.2008, 12:55 AM

Yep I did the BrianG mod

Quote:
Originally Posted by George16 View Post
Did you do anything to them?
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MTBikerTim
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09.10.2008, 12:57 AM

Quote:
Originally Posted by joeling View Post
Ya, I would like to know too as I have 2 units that are void of warranty...



I heard from somewhere it's USD50 no questions asked but maybe this is only relevant to the MM. Can anyone confirm ?

Regards,
Joe Ling
It's $75 or at least that's what I was quoted.


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