Walkera devo 10 seems to be dead

PhracturedBlue
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15 Jun 2013 14:06 #10989 by PhracturedBlue

Replied by PhracturedBlue on topic Walkera devo 10 seems to be dead

Here's something else to try:
There is a square box on the board above the vibration motor and above a circle with a + in it (between 2 big resistors). With the battery connected, and the power-switch 'on' verify that one of the pads has 12V on it and the other does not. If that is the case, you can short the 2 pads in the box together. That should bypass the power-on circuitry and turn on your Tx. If it works, your voltage regulator is ok, and the power-detect circuitry is shot.

Assuming your tx turns on, as a crude fix you could re-wire your power switch to connect to these pads. Then when you turn on the transmitter it would turn on. When you turn it off, it would shut-down immediately without informing the Tx 1st (like pulling the battery). This means you won't get save-on-shutdown, but at least your Tx will work.

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cofl1001
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15 Jun 2013 14:23 #10990 by cofl1001

Replied by cofl1001 on topic Walkera devo 10 seems to be dead

Hello again,

Indeed between ground and the pin towards the grey resistor I have +12.7v and between ground and the pin towards the blue resistor I have no power...

Short circuiting these 2 pins didn't start the tx unfortunately

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cofl1001
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17 Jun 2013 00:13 #11026 by cofl1001

Replied by cofl1001 on topic Walkera devo 10 seems to be dead

Hi guys, any other ideas??
RC711 just offered the "Discounted Price" of 105 USD+shipping, in my case that would be 123 final price...To me that's not discount !

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cofl1001
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20 Jun 2013 05:59 #11157 by cofl1001

Replied by cofl1001 on topic Walkera devo 10 seems to be dead

Anyway guys, since I had no luck finding the issue, I am about to order another DEVO10...I really hope it will live longer than the current one I have...
Thanks all
Florin

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FDR
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20 Jun 2013 07:16 #11161 by FDR

Replied by FDR on topic Walkera devo 10 seems to be dead

Look at the bright side: at least you will have some spare parts...

Don't get me wrong, I feel for you.

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cofl1001
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20 Jun 2013 07:40 #11162 by cofl1001

Replied by cofl1001 on topic Walkera devo 10 seems to be dead

FDR wrote: Look at the bright side: at least you will have some spare parts...

Don't get me wrong, I feel for you.

I am trying to be positive on this, and therefor I hope to get a good ladybug bundled together

Maybe after my return to Europe I could maybe get it fixed...
Nice community on this forum and I hope to get the deviationtx on my future devo...
All the best
Florin

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zhengyiuestc
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14 Aug 2013 14:08 #12967 by zhengyiuestc

Replied by zhengyiuestc on topic Walkera devo 10 seems to be dead

Hi,thank you for all you post. I have the same problem after 20min using of my Devo 10.

Could you please post the original post address from which you have the pics.

Thanks.

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zhengyiuestc
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15 Aug 2013 06:54 #12987 by zhengyiuestc

Replied by zhengyiuestc on topic Walkera devo 10 seems to be dead

Thanks a lot. guy.

Your solution works for my Devo 10. It works now.

I am still searching the complete solution.

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zhengyiuestc
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09 Sep 2013 09:46 #13661 by zhengyiuestc

Replied by zhengyiuestc on topic Walkera devo 10 seems to be dead

The circuit of Devo 8 is exactly same with Devo 10, except the MOS is silightly differnet. Thank you.

My MOS and 8550 blew out Simultaneously, strange. : (

Anyway, thanks a lot for the circuit and solution.

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BG4UNY
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11 Apr 2017 03:50 #61369 by BG4UNY

Replied by BG4UNY on topic Walkera devo 10 seems to be dead

我的D10也发生了相同的情况，如果你能在开关打开的情况下测量一下D10的工作电流的话，就可以知道是不是与我的情况完全一样。在我的D10发生故障时，工作电流在50MA，正常的在160MA左右。如果是这样的话，基本上可以确定故障是MCU的晶振没有工作，我的处理办法是换上了有源晶振，这样，类似的故障就不会再发生了

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galaxy76
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05 May 2018 09:36 #69058 by galaxy76

Replied by galaxy76 on topic Walkera devo 10 seems to be dead

PhracturedBlue wrote: Since it seems unlikely I can help you directly, this is about the best I can do:

Here is the schematic for the Devo8 power:
static.rcgroups.net/forums/attachments/3...08-18%2022.16.16.jpg
The Devo10 should be very similar.
The most likely issue is that you blew out the 8550 or 8050 transistors.

This happened to my Devo8. I dropped in whatever I had lying around the house and it has worked fine since. If the Vgs is different than the original, your voltage measurement on the Tx will be off slightly.

If it is helpful, here are front and back images of the devo10:
static.rcgroups.net/forums/attachments/2...8-devo10%20board.jpg
static.rcgroups.net/forums/attachments/2...5455724-132-burn.jpg
There are higher resolution images out there, but these are the ones I could find quickly.

As I've said repeatedly, I think Walkera's quality control is low. some of their circuit designs are marginal, and the components they used are pushed too close to the operating threshold. We've seen quite a few failures on every Tx model of different sorts.

I don't personally recommend running Li batteries in Walkera transmitters (except the Devo12) without a proper voltage regulator, since the power circuit seems to be marginal, and quite sensitive to over-voltage. Lots of folks ignore me without issue of course.

It is possible solve this problem permanently? can you change the transistor with a more resistant one?

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