Devo 8s over voltage input cannot power on

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02 Nov 2019 17:40 #75358 by mangmeephol
Devo 8s over voltage input cannot power on was created by mangmeephol
I am input 11.1v. Lipo battery and switch on lcd power on display show 1-2 sec display lcd off. After cannot use. Hlep me please.

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03 Nov 2019 00:23 #75360 by Birdman
Replied by Birdman on topic Devo 8s over voltage input cannot power on
Given it only takes 6v i reckon you have fried something. Could be you are not the first, do a search. Or open tx and you will probably see where the smoke came out.

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03 Nov 2019 00:29 #75361 by Birdman

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03 Nov 2019 00:43 #75362 by Birdman
Replied by Birdman on topic Devo 8s over voltage input cannot power on
There are 2 8s in my household, I can possibly help you identify components.

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03 Nov 2019 00:59 - 03 Nov 2019 01:00 #75363 by Birdman
Replied by Birdman on topic Devo 8s over voltage input cannot power on
www.deviationtx.com/forum/3-feedback-que...a-resistor-burn#9665

Even with only a 2s lipo you must use diode to drop voltage.

I have 2s lipo with diode in my 8s and it works fine like this.
Last edit: 03 Nov 2019 01:00 by Birdman.

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03 Nov 2019 05:27 #75364 by mangmeephol
Replied by mangmeephol on topic Devo 8s over voltage input cannot power on
No have burn in circuit. But VDD. Output 2.08v. Only

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03 Nov 2019 05:59 - 03 Nov 2019 06:04 #75365 by Birdman
Replied by Birdman on topic Devo 8s over voltage input cannot power on
Ok, may or may not be visible to naked eye, but I still reckon you have fried something.

Sounds like you have a DMM, problem "might" be easy to find. Check reg and other associated components in supply.

Reg input and output would be a start.
Last edit: 03 Nov 2019 06:04 by Birdman.

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03 Nov 2019 06:24 #75366 by mangmeephol
Replied by mangmeephol on topic Devo 8s over voltage input cannot power on
Have capacitor near L04A 1 unit. Multimeter check but no have capacity.

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03 Nov 2019 06:24 - 03 Nov 2019 06:25 #75367 by Birdman
Replied by Birdman on topic Devo 8s over voltage input cannot power on
Will look at my tx.

www.deviationtx.com/forum/search?query=d...te=all&childforums=1

Part of 8s power circuit can be found in above link.
Last edit: 03 Nov 2019 06:25 by Birdman.

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03 Nov 2019 06:43 #75368 by mangmeephol
Replied by mangmeephol on topic Devo 8s over voltage input cannot power on
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03 Nov 2019 06:48 #75369 by Birdman
Replied by Birdman on topic Devo 8s over voltage input cannot power on
I think you are looking in the wrong place. I cannot see 3v3 reg, maybe it is on other side.

Out of curiosity, what is blue wire on STM32?

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03 Nov 2019 07:06 #75370 by mangmeephol
Replied by mangmeephol on topic Devo 8s over voltage input cannot power on

This no have in and output no have voltage.
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03 Nov 2019 07:08 #75371 by mangmeephol
Replied by mangmeephol on topic Devo 8s over voltage input cannot power on

This ok.
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03 Nov 2019 07:10 - 03 Nov 2019 07:34 #75372 by Birdman
Replied by Birdman on topic Devo 8s over voltage input cannot power on
The RT9167A (LO4A) is a LDO reg but I would expect the 3v3 reg to look more that pictured below with yellow spot.

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Last edit: 03 Nov 2019 07:34 by Birdman.

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03 Nov 2019 07:21 #75373 by mangmeephol
Replied by mangmeephol on topic Devo 8s over voltage input cannot power on
LM78D06 have 6v. output When insert charger cable. RT9167A have 6v. input when insert battery and have output 2.08v. only.

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03 Nov 2019 07:28 - 03 Nov 2019 07:30 #75374 by Birdman
Replied by Birdman on topic Devo 8s over voltage input cannot power on
Ok, maybe LM78D06 is for charging, it's been a while and I need to familiarise myself again.

My tx has 6v in (red circle) and 3v3 out (yellow circle) of RT9167A,

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Last edit: 03 Nov 2019 07:30 by Birdman.

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03 Nov 2019 07:41 - 03 Nov 2019 08:26 #75375 by Birdman
Replied by Birdman on topic Devo 8s over voltage input cannot power on
Absolute maximum input rating for RT9167A is 8V

edit:
So if input is batt voltage it could be damaged. A schematic would make things much easier. The RT9167A-33CB are on Ebay
33 is 3V3 output voltage and CB will be package/pinout.
It appears you have enough knowledge to fix this. Keep us updated, it will help others.
Last edit: 03 Nov 2019 08:26 by Birdman.

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03 Nov 2019 08:49 #75376 by mangmeephol
Replied by mangmeephol on topic Devo 8s over voltage input cannot power on
Thank you very very much.

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03 Nov 2019 08:57 #75377 by mangmeephol
Replied by mangmeephol on topic Devo 8s over voltage input cannot power on
This capacitor you can check have how much capacity? I am check this capacitor check no have capacity.
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03 Nov 2019 08:59 #75378 by mangmeephol
Replied by mangmeephol on topic Devo 8s over voltage input cannot power on
This is problem VDD =2.08v. yes or no?

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