Panasonic KX-F910BX Service Manual page 51

(2) CHECK LCD ON THE MACHINE
If the digital board had broken, machine does not react at all and black square will be on the LCD.
There are 5 processes to display some letters (12:00 AM) on LCD.
If processes were not complete, black square will be on the LCD.
1. POWER ON
2. OSC
3. RESET
4. Read the data in the ROM
(program start)
5. Make peripherals initial
LCD
12:00 AM
Monitoring (KEY IN)
NG
If defective is in the power
line, LCD doesn't change.
NG
black square
NG
black square
NG
black square
NG
black square
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KX-F910BX
LCD
LCD
LCD
LCD
LCD