No Thruster, Grabber and/or ELS Control, but Video is Present and Cameras are Controllable.
Failure	Vehicle Power Supply has shut down power to the Backplane. All LEDs are normal.
Cause #1	One or more external LBV component has a short between 28VDC and ground.
Fault Isolation	Following the Procedure Manual, remove one Backplane component at a time, reenergizing LBV each time to test for normal operation of remaining components. Be advised that (though all thrusters are modular and interchangeable) the Port and Starboard Thrusters operate in concert. So; If no thrusters operate, and the Port thruster (which, for this example will ‘play-dead’) is removed, the Starboard Thruster may operate erratically. As long as, say, the Vertical Thruster now acts normally, the problem was indeed the Port Thruster. In this case, the Port Thruster is to be replaced. The fault could have been the Grabber, et al. as well.
Cause #2	The VPS Backplane over-current protection circuit has otherwise failed (See ‘LBV Power Failure Section’).

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