Improper Lcd Display - Panasonic UF-6300 Service Manual

4.2.

Improper LCD Display

Check connectors: CN14
(SC PCB) and CN50
(PNL1 PCB).
When pressing any key,
do you hear the 'Pi-' sound from
the Speaker?
Replace the PNL1 PCB.
START
No
Yes
END
Does CN14, pin 2 and pin 3
on the SC PCB
measure +5VDC?
Yes
Reinstall the firmware.
81
No
Replace the SC PCB.