Casio LK-90TV Service Manual page 19

22. Remove 21 screws and the keys.
23. Remove five screws and unsolder two connectors (JG, JF), and then remove the M474-LD1M PCB.
24. Remove seven screws and unsolder one connector (JE), and then remove the M474-LD2M PCB.
Connector (JG) Connector (JE)
(To CSM446-LD3M PCB) (To CSM446-LD5M PCB)
Connector (JF)
(To CSM446-LD4M PCB)
25. Remove three screws and the CSM446-LD3M PCB.
26. Remove three screws and the CSM446-LD4M PCB.
27. Remove three screws and the CSM446-LD5M PCB.
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