Panasonic KX-F680BX - Operation Board Section

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KX-F680BX/KX-F2681BX
3-11. OPERATION BOARD SECTION
(1) No key operation
(2) No LCD indication
Is the Key always pressed?
Check disconnection of CN5
(digital board) or CN301
(operation board).
Is the disconnection of the
cable and connector between
the LCD and Operation board
OK?
YES
NO
Replace the LCD.
Check IC301.
Repair.
Check IC301
(operation board)
Repair the keys.
YES
NO
NG