Casio LK-90TV Service Manual page 16

Tip: For easier assembly, it is a good idea to give each cable a name of a corresponding connector.
6. Remove four screws and three connectors.
Connector (CN13)
(To M649-CNA6 PCB)
Connector (CN17)
(To M649-CNA6 PCB)
7. Unsolder two connectors, and then remove the M649-MA1 PCB.
Connector (JX2)
(To M649-CNA1 PCB)
8. Unsolder two connectors, and then remove seven lead wires.
9. Remove four screws, and then remove the M649-MAA2 PCB.
Power cord (Black)
Power cord (Red)
Lead wire (Orange)
Speaker cord (White)
Speaker cord (Green)
Connectors
— 14 —
Connector (CN15)
(To M649-MAA3 PCB)
Connector (JY2)
(To M649-CNA1 PCB)
Speaker cord (Brown)
Speaker cord (Blue)