Help heard a pop in trasmitter

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shadow
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02 Jun 2013 01:04 - 06 Jun 2013 22:38 #10485 by shadow

Help heard a pop in trasmitter was created by shadow

Ok i was setting up my new model in my devo 8s on a devo 12 rx.
I had a 3s battery hooked up.

When I heard a pop and the TX was dead unplug the battery and could smell fried circuits. I opened it up but nothing looks burnt

What should I check?

Edit:
Ok further disassemble I found this on the back side of the board does anyone know what this is? It looks like maybe a transistor.

update:
Further investigation got the tx to power up without the module. After removing the rf shield Found burnt board.

Update: The part that fried on the main board is a IRLML6401PbF
www.irf.com/product-info/datasheets/data/irlml6401pbf.pdf
hexfet power mosfet

Last edit: 06 Jun 2013 22:38 by shadow.

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Hexperience
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02 Jun 2013 02:19 #10488 by Hexperience

Replied by Hexperience on topic Help heard a pop in trasmitter

I assume you had the 3s hooked up to the rx through an esc...

There are 10 types of people in this world. Those that understand binary and those that don't.

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rbe2012
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So much to do, so little time...

02 Jun 2013 08:15 #10493 by rbe2012

Replied by rbe2012 on topic Help heard a pop in trasmitter

3s is definitely too high voltage for the 8S. It usually runs with 4xAA = 6V and some folks here drive it with a 2S (up to 8.4V), most with a voltage reducing diode).

I think it will be a voltage regulator what is burned.

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domcars0
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02 Jun 2013 11:17 #10496 by domcars0

Replied by domcars0 on topic Help heard a pop in trasmitter

+1 @rbe2012

Devo 10 (+7e) owner. It's mine, please don't touch it with your big fingers

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shadow
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02 Jun 2013 12:50 #10499 by shadow

Replied by shadow on topic Help heard a pop in trasmitter

Yeah I grabbed the wrong battery i have a 3s and 2 s that are the same size oops.
question is what would the voltage reg part number be or size so i could order another one from digi key

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PhracturedBlue
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04 Jun 2013 21:20 #10566 by PhracturedBlue

Replied by PhracturedBlue on topic Help heard a pop in trasmitter

I can't tell what you fried on the Tx from those pics, but it looks like the CYRF module is shot. It will likely be easier to just buy a new one, but if you want to replace it, it is that 5pin board next to the bit (227J) Cap. The cap looks like it may also be shot from your pics.

Does your Tx power on/off with the power-switch when you remove the module (it sounds like it does?) If so, you didn't blow the power-on FET. Otherwise, you probably blew the P-Fet that controls power-on. you can replace it with nearly any P-fet (or even PNP though it will affect the voltage calibration if you get one with too much Vds drop).

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