Taranis Q X7 with USB failure

Hardware help and support for the FrSky Taranis
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Denethor
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Joined: Fri Oct 08, 2021 12:40 am
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Taranis Q X7 with USB failure

Post by Denethor » Mon Oct 11, 2021 8:24 am

Hi, I'm desperate and I don't know how to behave. I bought a new Taranis Q X7 ACCST from Banggood. Unfortunately I believe that this one came to me already faulty or with some short circuit on the board. The first thing I did as soon as the remote control arrived, becaausr not having a battery yet, was to try to connect it to the PC via USB to use it in the simulator and I tried to turn it on. Immediately after plugging it in, it gave off a burning smell coming from behind from parts of the battery compartment. As soon as I found a battery I tested it and saw the following situation:
- It turns on normally with battery inserted and without USB connection.
- It does not turn on if I try to do this with USB connection and battery inserted.
- If the remote control is off or without battery just connected via USB, it is recognized as a "STM 32 Bootloader" peripheral and I can easily read and write the firmware.
- If the remote control is turned on (both in normal mode and in bootloader mode) as soon as I connect it to the USB port it is not recognized and I do not add any peripherals to the PC, neither as a joystick nor as an SD card for reading files.
- If I try to write the firmware on the SD card in bootloader mode, it writes it normally, if I try to write the firmware from the menu with the remote control accessed, the firmware is not written normally.

Does anyone know me what the problem could be or what could have gone wrong? Unfortunately, to send the remote control back from Italy to China, it takes 50 euros and more than a month between the round trip and I don't know if this involves replacing it with a new remote control or just further problems ...

You think it can be repaired without excessive expense?

Thanks


Denethor
Posts: 5
Joined: Fri Oct 08, 2021 12:40 am
Country: -

Re: Taranis Q X7 with USB failure

Post by Denethor » Mon Oct 11, 2021 8:27 am

IMG_20211011_095336.jpg
(4.86 MiB) Not downloaded yet
There don't seem to be any obvious problems on the board


IMG_20211011_103029.jpg
(4.03 MiB) Not downloaded yet
IMG_20211011_103035.jpg
(3.08 MiB) Not downloaded yet
I am left with the doubt on the integrated stm32 that it is not clear if it has a burn or if it is just a machine

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Kilrah
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Country: Switzerland

Re: Taranis Q X7 with USB failure

Post by Kilrah » Mon Oct 11, 2021 8:34 am

Seems it's exploded, should be pretty easy to pass a finger on it and see if there's a hole which it seems it might have...

Denethor
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Joined: Fri Oct 08, 2021 12:40 am
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Re: Taranis Q X7 with USB failure

Post by Denethor » Mon Oct 11, 2021 1:58 pm

But what could have been the cause?
Was it already defective or was I wrong to try to turn it on only with the USB connection?
I believe that at this point I will take it to an electronic laboratory for testing and replacing the integrated circuit but I would like to know your opinion on what could have failed and why ...

Thanks

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Kilrah
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Country: Switzerland

Re: Taranis Q X7 with USB failure

Post by Kilrah » Mon Oct 11, 2021 2:56 pm

Trying to turn on with USB connected will not work, but not cause damage.
You say it turns on so it's unlikely the STM is damaged.

Since the USB port works when off it seems that's OK too so it's not clear what issue there could be...


Denethor
Posts: 5
Joined: Fri Oct 08, 2021 12:40 am
Country: -

Re: Taranis Q X7 with USB failure

Post by Denethor » Mon Oct 11, 2021 3:24 pm

It is strange that if I have the USB port inserted and I try to turn it on this does not happen....

Maybe a power problem or short circuits?

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Kilrah
Posts: 10987
Joined: Sat Feb 18, 2012 6:56 pm
Country: Switzerland

Re: Taranis Q X7 with USB failure

Post by Kilrah » Mon Oct 11, 2021 3:36 pm

The radio will never power on if it's off and the usb port is plugged, that's normal.


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