devo 7e blown regulator

Hi guys

I need someone who has a devo 7e for help if possible. Basically I managed to burn out something on after my board after I installed the 7105 module. I think I must have made a short somewhere. I believe I have burnt the regulator as can be seen in the photo but is unsure .

Can anyone tell me what I actually destroyed? I tried searching photos online of the board but it just wasn't clear enough.

Your help is much appreciated.

On mine, the device has the marking FMD2G. I can't identify the device, but will check it with my component tester tomorrow, at work.

Thanks for the reply.

However, upon further inspection it seems that the it is beyond repair as the board is burnt around it? I am not really great at electronic so I think even if it's repairable, it's beyond my reach. Might be better to just purchase a new one.. sigh.

Looks really bad... if you can scratch the smut away (carefully!) you can see if the board is really damaged or if it comes only from the burned component.
Maybe you should remove the board to look at its back side. If it looks ok there you might have a good chance.

Does the transmitter still work?
Did you connect something to the two pads just below the burn mark?
My job is to design/debug circuits. To me, the damage looks like an uncontrolled short circuit. I'll have more information tomorrow after I've tested that area of my transmitter.

Nope, the radio doesn't turn on anymore.

The whole area is burnt, not just the component. Backside is fine though.
Might be too much of a hassle to repair I think.
Luckily, it's only a devo 7e. I will look at this as a lesson. I have another one on the way .

PB did this for Devo10 and does look very like devo7e.



Could be fairly simple repair..

Well hope it helps Good luck

SadSack wrote: PB did this for Devo10 and does look very like devo7e.

Could be fairly simple repair..

Well hope it helps Good luck

Wow. Thanks a lot for this. I will try this when I have time.

Hi everyone,

exactly the same issue happened to my 7e today, same story, i may have short sthg...
but the damages are not that size.
does somebody know if this kind of regulator is availavbe for sale anywhere on the net ?
(actually, i achieve to boot the devo with a piezzo spark on the right jumper, i don't understand why but it works even if this isn't very convenient:) )

Thx, Nicolas

I think you can easily repair this one. Myself I use a 3v3 regulator small pcb with AMS1117-3v3, as the sMD regulator inside the Devo 7e get very hot when using more than 10mW tx power. (so the stock reg is not suitable to transmit at 20dBM and handle the bigger current) It gets to hot too touch.

www.banggood.com/2Pcs-DCDC-3_3V-AMS1117-...Module-p-945171.html

I think i have posted some information in the topic about, buzzing noises from devo 7e

I think in your case likely only the regulator has burned, you can put 3v3 reg as posted it works fine i use like that.

But if you have bad luck the full unregulated battery voltage have been on all components and might damaged more, but it isd unlikely.

See here www.deviationtx.com/forum/6-general-disc...urrent-draw?start=20

You see image input of the module take from the pad as shown, close to the burned area, the 3v3 output you can wire direct to the module, or else (all 3v3 line are connected) the ground you can connect to metal of module or anywhere. (all ground are common)

should work fine I use like that for long time and also keep stable 3v3 at any tx power setting.

Hmm sorry guys, I was too quick not the 3v3 reg has burned but the circuit around psu. No experience with that part.....

Looking at the provided schematic and the fotos, it is the mosfet(IRLML6401)
that is into the power switch circuit.

Clean up the area and look what has been left.
Then you must find the reason for the blast.

Thanks for ur quick answer fernandes

Amax: no damages on the pcb, but this component seems to be disabled.
Now, the devo refuses to boot unless i disconnect and re-connect the battery.
However, i managed to make it obey and boot with a piezzo spark on the jumpers pin but it's not convenient at all, i would be happy to solder a new mosfet on it

Finally i ordered the mosfet, soldered it, and it's working again.

Hello! My first post.. I've been messing around with a Devo 7e for a couple of weeks now. Removed the module myself it couldn't have gone better!, and installed the multi module(I had a technician install the 2401 connection) When I got home I decided to mount the module to the Tx with some mounting tape before I powered it on to try out the new 2401 module. As you will see from the pictures I made a very dumb mistake (I believe this is what caused it anyway) and mounted the RF shield of the module right over some power wires.. well it didn't power up so I shut it off right away and pulled it open quickly. That same 'mosfet' you guys are talking about was orange and slowly cooled down. I will have pictures to follow. So I did as much research as I could find and ordered 4 different mosfets;
From Digital-Key;
MOSFET IRLML6401 PBFDKR-ND
MOSFET IRLML6401 PBFCT-ND
From Mouser;
MOSFET IRLML6401 TRPBF
MOSFET IRLML6401 GTRPBF
Will any/all of these replace my burnt one?
Thanks so much for your time and consideration!

This is the damaged part;


This is how I think I made the mistake.. I think the RF shield has arced those wires below the foam tape