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Thank you, p21marola! I think you can try to check power only on few of the dedicated processor power pins, because, I'm sure, they are shared. Check that you have 3.3 volts on cpu dedicated legs with connected through USB to your PC(and without TX battery). About baking... Maybe you can order new C...

q501 is NOT BAW56 double diode!!!
after I resolder q501 back the TX powered on! Yeah! I'm so happy.

So I reflowed new stm32 mcu and q501 double diode and now I have got stm32bootloader in windows device manager. Now I can flash firmware through opentx companion, but cant power on the receiver. I'v got no reaction at all when pressing power button, no power button led or lcd. Any thoughts where to ...

Hi, p21marola.
I think the easy way is to change mainboard, but if you have air rework station and some skills reflowing main MCU( STM32F205VET6) can help. I ordered new stm32 chip and diode(because find out it is dead) and hope that changing main chip will resurrect my radio.

Voltage on BOOT0 is 3.3V and it's connected through R418(7.3K) to the ground.

Screenshots

So I'm at home now... Made some tests: When plugged from USB MCU power is OK - 3.28V Tried to connect and flash with stlink, but I can only read and erase memory, but having problem with writing - got an error " Programming error @ 0x08000008! " And after getting this error I can see that ...

I think the only one difference of the main boards of x7 and x7s is soldered Bluetooth module on x7s.

I'm think about ordering new main board, but not sure about x7s version. Is boards of x7 and x7s same? Asking because fast search on eBay and bangood don't give me any x7s versions, only x7 rev. 0.4

Carbo wrote: ↑Tue Oct 02, 2018 9:02 am Usually it can not be bricked. What happens, if you disconnect battery and connect TX to PC?

Nothing happens. No new devices in Control Panel or Zadig. Also tried with trim buttons in bootloader mode - same story. I just can hear slight click from TX speaker when inserting USB.

Gramps50 wrote: ↑Tue Oct 02, 2018 3:51 am Did you by chance charge the TX battery to see if that made a difference?

Thanks for answer. Battery is fully charged 12.6V, and also tried battery from my fatshark googles, it has 2s connector with 8.4V but nothing changed.

Also want to ask about main board - I think that qx7 and qx7s boards are similar, am I right?
And does anyone know where is the power cycle part of the board and what elements I must test at first?
P.s. thank you.

Hi, all. My qx7 is 3-4 monthes old. From the begining of use I flashed OpenTX version 2.2.2 with bootloader. Nothing changed except battery, I'm using 3x18650 = 12.6V. This mod was made one week ago and everything was fine for the last week(I flied every day). Yesterday, between flights, I powered o...