Pixhawk 5x Power Loss

PX4 Autopilot
1

Hello all,

I have an issue with my 5x losing power after plugging in a YRRC FPV Radio Telemetry Air Module into the TELEM1 port.
The issue is after I power on the Pixhawk and plug in the YRRC module while the FC power is on, the air module green connection light starts blinking and after 5 seconds the FC loses power. The same problem occurs if I have the module plugged in before powering on. (Powering the FC, and YRRC module at the same time.) I have checked the pins inside the port, and even tried TELEM2 and 3, the same problem occurs. I have tested 2 of my Wi-Fi modules and the same thing happens, rapid light blinking and power loss.

About 5 minutes before this issue started happening, I swapped the RX & TX cables so it would connect to QGC. After I swapped the cables, it successfully connected to QGC and I powered off. After powering back on, this problem started occurring.
And about a week before this exact setup was making a test flight but lost control and crashed. No visible damage to the battery, FC, or YRRC module.

Full setup:
14.8V battery
F55A Pro II 6S 4 in 1 32 bit ESC
Pixhawk 5x & baseboard
YRRC FPV Radio Telemetry Air Module

Any help would be greatly appreciated,
Thank you!

2

Did you try to power it from the external power supply? Maybe it just draws too much current.

3

I have not, I will try that next. I just don’t understand why it would work with this setup one day and not the next, without any changes.

4

Update

Went back and tried to power on, and it worked.

Disconnected and adjusted my frame. Plugged back in and same issue. But more interesting, I left the YRRC module unplugged and tried to power on and the FC lost power after about 5 seconds. The ESC still has power so I believe it is isolated to the FC. Tried POWER2 and POWER1, both have the same result.