RoboRIO Red Power LED

[diverson]

Last night we noticed that the Power LED on one of our RoboRIOs was red. This indicates a fault on one of the user power buses. We could not see any debris or other obvious causes of short circuits in any of the exposed pins.

Some careful probing with a multimeter revealed that the 3.3V bus was good and the 6V PWM bus was reading 5.8V. Anywhere we expected to see 5V, though, was reading 30 to 40 mV.

So it appears that the 5V bus is either faulty or shorted to ground. I couldn't see any signs of damage on the board. Has anyone else run into this? Anyone have any troubleshooting or repair tips?

Thanks!