Read Panasonic CF-73 Service Manual online
Make sure that connecting cables, connectors and AC adapter are not loose or disconnected prior to testing.
No.
Result
YES
Brightness
adjustment
adjustment
NO
Go to No.1-2
YES LCD
NO
Go to No.1-3
YES Main PCB
IC800
NO
LCD cable
YES
Brightness
adjustment
adjustment
NO
Go to No.2-2
YES LCD
NO
Go to No.2-3
YES Main PCB
CN801
IC14
NO
LCD cable
YES LCD
NO
Go to No.3-2
YES Main PCB
IC800
NO
LCD cable
YES Inverter PCB
NO
Go to No. 4-2
YES Inverter cable
NO
Go to No. 4-3
YES Backlight
NO
Main PCB
CN801
IC14
Replace the Main PCB.
Does operation return to
normal?
Does operation return to
normal?
3 Part of the screen does
not display properly.
Display quality poor.
(Fuzzy or slanted, etc.)
Display quality poor.
(Fuzzy or slanted, etc.)
3-2
9.3 LCD DIAGNOSIS
1 No picture appears on the
screen.
1-3
Replace the Main PCB.
Does operation return to
normal?
Does operation return to
normal?
1-1
Replace the LCD.
Does operation return to
normal?
Does operation return to
normal?
Source of
problem
Component
Troubleshooting
procedures
Symptom
No.
2-1
Does the LCD display
properly after brightness level
is adjusted?
properly after brightness level
is adjusted?
1-2
Does the LCD display
properly after brightness level
is adjusted?
properly after brightness level
is adjusted?
2 Display is too dark or too
bright.
Replace the LCD.
Does operation return to
normal?
Does operation return to
normal?
2-2
2-3
Replace the Main PCB.
Does operation return to
normal?
Does operation return to
normal?
3-1
Replace the LCD.
Does operation return to
normal?
Does operation return to
normal?
4 Backlight does not turn
on.
Replace the Inverter PCB.
Does operation return to
normal?
Does operation return to
normal?
Replace the Inverter cable.
Does operation return to
normal?
Does operation return to
normal?
4-1
4-2
4-3
Replace the Backlight.
Does operation return to
normal?
Does operation return to
normal?
17
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