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Look for blown fuses in the chair electrics and electronics.
The back not working, might mean a blown fuse, or dirty wiring (so cleaning and re-seating all removable connections would be ideal), or perhaps a defective circuit board. But cleaning all removable connections and re-seating them in place (unplugged and with power Off of course) would be the right first measures to try.
Let me know how it goes, please, and what you find out.
The remote is usually not the problem - esp. if it produces any reaction.
If a click is heard then relays or actuators are working - but whatever they pass power to, is not. Motor(s), linkage(s)... it might be any of those. Or even the power they are passing, perhaps isn't there.
To tell what is going on, some measurement of wires and terminal points would be necessary.
That's OK... I'm in Eastern Time, and will have to be offline soon.
Let me know tomorrow anytime, how it goes, and what you find out, etc. Thanks.
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