Checks / troubleshooting:
Check connection of Head FFC.
Check connection of CR_FFC.
Head FFC may be damaged.
CR_FFC may be damaged.
Print head may be damaged.
MAIN board may be damaged.

Recommended actions:
Make sure to connect Head FFC surely.
Make sure to connect CR_FFC surely.
Replace Head FFC.
Replace CR_FFC.
Replace Print head.
Replace MAIN board.