Power to Open ROV controller board

The ROV does not start up when battery and usb connected. I measure 3.5 V at pins 4/5 and 6/7 of the 25 pin connector when disconnected, but the voltage arriving at the computer board pins P9: 1/3 has dropped to about 0.1 V, even with the computer off the board.

I have disconnected everything disconnectable on the controller board, but no change. Nothing seems to be gettin hot.

Any ideas?

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