Devo 8s over voltage input cannot power on

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03 Nov 2019 11:12 #75379 by mangmeephol
Replied by mangmeephol on topic Devo 8s over voltage input cannot power on
Who have experienced this problem please share experienced.

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03 Nov 2019 12:28 #75381 by Birdman
Replied by Birdman on topic Devo 8s over voltage input cannot power on

mangmeephol wrote: This capacitor you can check have how much capacity? I am check this capacitor check no have capacity.


That is noise bypass cap, there will be 0 volts across it. You will need to remove it from circuit and use capacitance meter to check capacitance value but it will be good. No problem there.

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03 Nov 2019 12:30 - 03 Nov 2019 12:33 #75382 by Birdman
Replied by Birdman on topic Devo 8s over voltage input cannot power on

mangmeephol wrote: This is problem VDD =2.08v. yes or no?


Yes this is a problem it should be 3.3 volts.

RT9167A-33CB is a 3.3 volt low drop out regulator, its out put should be 3.3 volts.
Last edit: 03 Nov 2019 12:33 by Birdman.

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03 Nov 2019 12:38 #75383 by mangmeephol
Replied by mangmeephol on topic Devo 8s over voltage input cannot power on
RT9167A-33CB is change my devo 8s can use ?

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03 Nov 2019 13:12 - 03 Nov 2019 13:16 #75384 by Birdman
Replied by Birdman on topic Devo 8s over voltage input cannot power on
Impossible for me to say. PhracturedBlue says full voltage also goes to CYRF module. There could be other damage.

CYRF module has its own 3v3 reg.

Read links I posted. PB suggests the other person remove RF module and see if it turns on.

Edit: Personaly, if you can see or find no other damage I would replace RT9167A-33CB and see.
Last edit: 03 Nov 2019 13:16 by Birdman.

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03 Nov 2019 13:38 #75385 by Birdman

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03 Nov 2019 23:04 #75392 by mangmeephol
Replied by mangmeephol on topic Devo 8s over voltage input cannot power on
Thank you very very much.

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04 Nov 2019 03:40 #75393 by Birdman
Replied by Birdman on topic Devo 8s over voltage input cannot power on
More info, both links have reference Devo 8s

www.deviationtx.com/forum/3-feedback-que...s-to-be-dead?start=0

www.deviationtx.com/forum/3-feedback-que...evo-10-repairs#61461

One also replace a 8050 or 8550 transistor

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04 Nov 2019 05:01 - 04 Nov 2019 05:04 #75394 by Birdman
Replied by Birdman on topic Devo 8s over voltage input cannot power on
Had a good look at 8s power schematic and I think your transistors and fet are good and the problem is your 3v3 reg and or after it.

If you have any old or broken device many have 3v3 regs in them like LM1117-3v3. It is possible to cut them from pcb and use this to test, or cut traces and wire it in. To remove devices like RT9167A I sometimes carefully cut all legs (be carefull not to cut traces under component) but one with sharp knife then desolder component and all legs. It is easy and safe it you go about it the right way.

If it works buy correct component and install it.
Last edit: 04 Nov 2019 05:04 by Birdman.

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04 Nov 2019 05:18 - 04 Nov 2019 05:42 #75395 by Birdman
Replied by Birdman on topic Devo 8s over voltage input cannot power on

mangmeephol wrote: RT9167A have 6v. input when insert battery .


To be clear, is this when you insert battery "and" turn on? if so transistors and IRLML6401 should be ok. If RT9167A has 6v input when switch is off transistors and/or IRLML6401 is probably damaged as well as RT9167A.

Red circle in below picture about 6v when switch off
Yellow circle 0v when switch off

Yellow circle about 6v when switch on (this goes to reg)

red/yellow is jumper in schematic

.......

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Last edit: 04 Nov 2019 05:42 by Birdman.

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04 Nov 2019 06:02 - 04 Nov 2019 06:38 #75396 by Birdman
Replied by Birdman on topic Devo 8s over voltage input cannot power on
schematic added reg

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Last edit: 04 Nov 2019 06:38 by Birdman.

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04 Nov 2019 06:10 #75397 by Birdman
Replied by Birdman on topic Devo 8s over voltage input cannot power on
schematic

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04 Nov 2019 07:07 - 04 Nov 2019 07:08 #75398 by Birdman
Replied by Birdman on topic Devo 8s over voltage input cannot power on
Operating voltage of STM32 is 2 - 3.6v so it is right on the threshold.
Last edit: 04 Nov 2019 07:08 by Birdman.

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04 Nov 2019 07:10 #75399 by mangmeephol
Replied by mangmeephol on topic Devo 8s over voltage input cannot power on
If stm32 burns, devo 8s still have a chance to repair it back to use as before?

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04 Nov 2019 07:23 - 04 Nov 2019 07:29 #75400 by Birdman
Replied by Birdman on topic Devo 8s over voltage input cannot power on

mangmeephol wrote: If stm32 burns, devo 8s still have a chance to repair it back to use as before?


I think stm32 will be ok.
The part is cheap enough and I could replace one, but might be to costly to pay someone.

RT9167A-33CB sot-25 package and S8050 and 8550 sot-23 package on ebay for a few dollars or get through digikey or mouser or similar.

I have many components at home, but if I didn't and it was me I would find a 3v3 ldo reg and connect it with wires and see if it turns on.

Edit: May not need ldo reg to test with full battery.
Last edit: 04 Nov 2019 07:29 by Birdman.

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04 Nov 2019 07:28 #75401 by mangmeephol
Replied by mangmeephol on topic Devo 8s over voltage input cannot power on
I saw smoke at stm32 while testing the battery.

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04 Nov 2019 07:30 - 04 Nov 2019 07:32 #75402 by Birdman
Replied by Birdman on topic Devo 8s over voltage input cannot power on
Well that is not good.

Not sure how if reg is only putting out 2v ???
Last edit: 04 Nov 2019 07:32 by Birdman.

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04 Nov 2019 07:33 #75403 by mangmeephol
Replied by mangmeephol on topic Devo 8s over voltage input cannot power on
That mean end?

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04 Nov 2019 07:37 #75404 by mangmeephol
Replied by mangmeephol on topic Devo 8s over voltage input cannot power on

This is my reg. 5v.to 3.3v. But 800ma.
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04 Nov 2019 07:39 #75405 by Birdman
Replied by Birdman on topic Devo 8s over voltage input cannot power on
Impossible to say from here without looking at it, but if you smoked the SMT32 it is not good and yes it maybe the end. There are cheap transmitters on the market now.

Maybe still try new reg, up to you.

I will offer to buy it for parts. If I can fix it cheap I will send it back.

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