Hi, Barry
You never!! responded to the help "start" hear, Starting a new Post isn't going to fix it !!
Sounds like you've lost the 5 volts to your encoders, If you haven't changed any thing, That's the first place to look.
Disconnect the pos. leads to your servo motors.
On your Gecko's, Check from Gnd to Encoder + terminal for 5 volt's, If you don't have power to the encoder's it's not going to work.
If the encoder's have power, Check the A & B encoder terminals on the Gecko's, Gnd to A & Gnd to B for 5 volt's then 0 volt's by turning the servo shaft
slowly, If thy are both good, Swap the A, B, encoder wires around, Reconnect the pos. lead to the servo motor and re-set it, Should lock-up and hold
position. Turn the power off when connecting or disconnecting wire's.
Thanks, Chip