Devo 12S Thold error

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25 Nov 2018 15:33 - 25 Nov 2018 15:38 #71881 by RobC62
Devo 12S Thold error was created by RobC62
Hopefully someone can help out with a Devo 12S I have for repair that is throwing a 'Thold' error on booting up that cannot be cleared. The tx cannot be booted into update mode either, so no way of flashing Deviation onto it.

The hold switch has been replaced, albeit minus the PCB board that is usually attached. I am wondering is there was a resistor built into the board that would need one of correct value fitting to the replacement switch?
I have traced connections and there are no breaks.

Any help will be greatly appreciated. Thank you in advance!
Last edit: 25 Nov 2018 15:38 by RobC62.

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26 Nov 2018 03:29 #71892 by DanKhuu
Replied by DanKhuu on topic Devo 12S Thold error
I am guessing you could disconnect all the switches except the trainer switch and see if you can boot into the programming mode.

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26 Nov 2018 08:22 - 26 Nov 2018 08:23 #71895 by RobC62
Replied by RobC62 on topic Devo 12S Thold error
Thanks for the reply. Have previously tried that, but unfortunately it still fails to allow the tx to open up for flashing.
Last edit: 26 Nov 2018 08:23 by RobC62.

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26 Nov 2018 16:00 - 26 Nov 2018 16:12 #71896 by vlad_vy
Replied by vlad_vy on topic Devo 12S Thold error
Trace "Thold" switch to MCU pin 129 (PG14). I think "Thold" switch will ground pin 129. If with disconnected "Thold" switch you have the same problem - probably pin 129 grounded by some way, e.g solder splashes.

www.deviationtx.com/wiki/hardware/devo12

By the way, next pin 130 is Vss (ground ???). Check if they connected by solder splash.
Last edit: 26 Nov 2018 16:12 by vlad_vy.

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01 Dec 2018 14:42 - 01 Dec 2018 14:43 #71945 by RobC62
Replied by RobC62 on topic Devo 12S Thold error
Thanks vlad. I had previously checked for bridging on the MCU, and have reflowed it just to be doubly sure. Inspected with 40x magnifier and nothing bridged. Error persists.
Anywhere else causing it, bar the MCU being shot, seems unlikely?
Last edit: 01 Dec 2018 14:43 by RobC62.

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