- Posts: 8
Devo 7E main PCB component ID help
01 Jun 2016 03:49 #49698
by Fyathyrio
Devo 7E main PCB component ID help was created by Fyathyrio
Helped a friend install an NRF module in his Devo 7E, the previous owner had hacked in a module using twisted wires, DuPont connectors, booger solder, ect. We tested with everything loosely put together, and it worked fine, but when he bolted it up, he pinched a wire or something and let the magic smoke out. Damage to what looks like a FET was too much to read the info on the chip, so I was hoping somebody can help ID it so we can get a replacement.
It's located under the pitch/roll sticks, on the left as you look at the opened up Devo.
The chip is shown with red arrow, close up view below.
Thanks,
Mark
It's located under the pitch/roll sticks, on the left as you look at the opened up Devo.
The chip is shown with red arrow, close up view below.
Thanks,
Mark
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01 Jun 2016 05:08 - 01 Jun 2016 05:17 #49701
by PhracturedBlue
Replied by PhracturedBlue on topic Devo 7E main PCB component ID help
looks like an FM02G (or FMO2G) transistor.
Based on this and looking at my Tx, it bridges the power jumper, and so is likely a power P-FET.
My Devo8 used a
IRLML6401 which is probably equivalent, since the power circuit on all Devo radios is basically the same.
You can use any PFET that can sink more than an amp and has low Rds. I used a generic to92 p-fet from radio shack when I blew that exact same tx on my devo8.
Just checked and looks like I used a BS250 which is in no way an appropriate replacement as it has terrible Rds and low power sink, but still it has been running fine for a couple years now. So find any old P-fet and stick it in there
BTW, the power circuit for the Devo8 is here:
www.deviationtx.com/downloads-new/catego...power-switch-circuit
The 7e wil be basically the same
Based on this and looking at my Tx, it bridges the power jumper, and so is likely a power P-FET.
My Devo8 used a
IRLML6401 which is probably equivalent, since the power circuit on all Devo radios is basically the same.
You can use any PFET that can sink more than an amp and has low Rds. I used a generic to92 p-fet from radio shack when I blew that exact same tx on my devo8.
Just checked and looks like I used a BS250 which is in no way an appropriate replacement as it has terrible Rds and low power sink, but still it has been running fine for a couple years now. So find any old P-fet and stick it in there
BTW, the power circuit for the Devo8 is here:
www.deviationtx.com/downloads-new/catego...power-switch-circuit
The 7e wil be basically the same
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01 Jun 2016 07:09 - 01 Jun 2016 07:21 #49705
by bianchifan
Maybe this helps
edit..
You can ask in English, too.
Alternative thread on eevblog supported by the author of an alternative Firmware madires (Markus ?)
Both worms are heavy weighted
Software available on Mikrocontroller.net SVN & Github miror
Replied by bianchifan on topic Devo 7E main PCB component ID help
Fyathyrio wrote: Damage to what looks like a FET was too much to read the info on the chip, so I was hoping somebody can help ID it so we can get a replacement.
Maybe this helps
edit..
There is a project "AVR Transistor Tester" on German forum Mikrocontroller.net supported by the author Karl-Heinz KübbelerFyathyrio wrote: Also, is there a way to confirm a FET is N or P when no official data sheet / purchase info can be found to confirm what I think I have?
You can ask in English, too.
Alternative thread on eevblog supported by the author of an alternative Firmware madires (Markus ?)
Both worms are heavy weighted
Software available on Mikrocontroller.net SVN & Github miror
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01 Jun 2016 10:45 #49715
by MikefromGermany
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01 Jun 2016 16:03 #49761
by Fyathyrio
Replied by Fyathyrio on topic Devo 7E main PCB component ID help
Thanks to everybody for the assistance! We got this now. 
Looks like I need to get one of those testers, seems pretty handy.
Looks like I need to get one of those testers, seems pretty handy.
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05 Jun 2016 04:39 #49932
by royent
Replied by royent on topic Devo 7E main PCB component ID help
I'm assuming this fet is the issue as it appears to be slightly disformed as you can see in the picture.
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