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Hi! i'm new to the hobby and i bought a QX 7 transmitter, i was using fine until a day i tried putting a SD card, it booted up fine, there was voice sound when starting up, then i went and changed the volume of the speaker and turned off.

After that i tried turning on there is nothing, no screen turning on, no DFU mode holding the trim buttons, just a noise on the speaker when i press power button or when i plug the usb cable, my computer won't show or even recognize the transmitter or the STM32 chip. I Tried with and without SD card, tried new sd card, tried the TXcompanion to flash, even STM32 bootloader flash but it doesn't find the device. I tried on 3 windows machines and a mac, nothing! Tried multiple USB cables too!

Here is the video of the problem: https://youtu.be/R5oI4Va5SmI

Here is what i tried:
Removed the ClockBattery inside
Tried other Batteries,
Tried with other and without sd card.
Opened checked for any sign of burnt component.
Entered in contact with frsky, but none of the bootloader Brick fixes worked.

I tested other stm32microcontrolelrs that i have and my computer recongize without a problem.

I don't know what to do anymore, is there a way to fix this? can i flash the stm32 chip directly?

Another one bite the dust

Is the processor getting too hot to the touch when you keep the power button pressed?

João

jhsa wrote: ↑Thu Jan 30, 2020 10:02 pm Another one bite the dust

Is the processor getting too hot to the touch when you keep the power button pressed?

João

No not at all. is there a pin that i can check if the MCU is getting power?

I tried to flash with ST-link, it connects succesfully to the MCU but when programing and verify it generates this error, and comparing the file of the firmware with the MCU some of the blocks are different and still no sign of life of the QX7 powering on.

You have a bit in a particular column of the flash memory that appears to always be reading as a '1'. This strongly suggests a processor failure. If it is a recent purchase, I would suggest this is due a warranty replacement.

Mike

Jortug wrote: ↑Thu Jan 30, 2020 9:25 pm Entered in contact with frsky, but none of the bootloader Brick fixes worked.

What bootloader brick fixes were?
I have same issue, no dfu device detected, only tick sound when button pressed.
5V and 3V3 appears, STM not gets hot.

Ozyris wrote: ↑Thu Apr 22, 2021 6:07 pm

Jortug wrote: ↑Thu Jan 30, 2020 9:25 pm Entered in contact with frsky, but none of the bootloader Brick fixes worked.

What bootloader brick fixes were?
I have same issue, no dfu device detected, only tick sound when button pressed.
5V and 3V3 appears, STM not gets hot.

Hello, did you manage to solve the problem? The same thing is happening to me with my x7, speaker sound but without dfu mode on pc, I have connected a stlink to it and I can read the code and write it without errors but I can't start it, thanks