Casio PX-780 - Key;Button, Touch Panel, and LCD Issues

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4-6. KEY/BUTTON NG
FFC/FPC
damaged?
Check the connection
of CN15 and CN16.
Check if keys are
correctly assembled.
Connector is loosely
connected.
Keys are not
correctly assembled.
MAIN PCB is defective.
OK Yes
NG
No
No
OK
FFC/FPC is defective.
4-7. TOUCH PANEL NG
After replacing the TOUCH
PANEL, check again.
Check the connection
of CN3.
TOUCH PANEL
is defective.
Connector is loosely
connected.
MAIN PCB is defective.
OK
NG
OK
No
4-8. LCD NG
After replacing the LCD,
check again.
Check the connection
of CN5.
LCD is defective.
Connector is loosely
connected.
MAIN PCB is defective.
OK
NG
OK
No