Sorry, life overtook me for a bit.
I did, in fact, take the following steps.
1. I removed the blue tape that I installed when I received the unit to cover unused ports, and I removed the SD card.
2. I performed a visual inspection under a strong light of all electrical ports and saw no evidence of FOD (Foreign Objects / Debris).
3. I took photos of all electrical ports and magnified and inspected these and saw no evidence of FOD.
4. I inverted and vigorously shook the unit over a white piece of paper. Two very small pieces floated (not fell) off the unit. These were perhaps 0.3mm in dimension, too small to bridge the gap between 0.1 inch header pins. They were not hard like wire, so I conclude that they were organic.
5. I repeated the visual inspection (without taking additional photos) and saw no evidence of FOD.
I took the following steps.
1. I removed the blue tape that I installed when I received the unit to cover unused ports, and I removed the SD card.
2. I performed a visual inspection under a strong light of all electrical ports and saw no evidence of FOD (Foreign Objects / Debris).
3. I took photos of all electrical ports and magnified and inspected these and saw no evidence of FOD.
4. I inverted and vigorously shook the unit over a white piece of paper. Two very small pieces floated (not fell) off the unit. These were perhaps 0.3mm in dimension, too small to bridge the gap between 0.1 inch header pins. They were not hard like wire, so I conclude that they were organic.
5. I repeated the visual inspection (without taking additional photos) and saw no evidence of FOD.
6. I removed the screws in the case and took the board out of the case.
7. I used my cell phone camera to magnify and performed a visual inspection of both sides of the board. One odd thing I saw was what appeared to be a jumper wire between two pins of U37. I didn’t know they did that with surface mount devices, so it could be a wire that was accidentally soldered in. I didn’t see any other potential issues.
8. I shook the unit vigorously over white paper and saw no evidence of FOD.
9. I reassembled the board and case, reinstalled the SD card, and connected power and the computer.
10. I turned on the driver station and still receive the brownout message.
I conclude that this is probably not a FOD issue but something a
6. I removed the screws in the case and took the board out of the case.
7. I used my cell phone camera to magnify and performed a visual inspection of both sides of the board. One odd thing I saw was what appeared to be a jumper wire between two pins of U37. I didn’t know they did that with surface mount devices, so it could be a wire that was accidentally soldered in. I didn’t see any other potential issues.
8. I shook the unit vigorously over white paper and saw no evidence of FOD.
9. I reassembled the board and case, reinstalled the SD card, and connected power and the computer.
10. I turned on the driver station and did not receive the brownout message.
11. I connected the Rio to my robot and ran Driver Station and Phoenix Tuner.
12. I ran the Temporary Diagnostic Server in Phoenix Tuner. AS SOON AS TUNER SUCCESSFULLY CONNECTED, THE ROBOT ENTERED BROWNOUT MODE.
13. I repeated steps 11 and 12 several times with the same result.
Any further advice?
