CF-28 - Panasonic PC Service Manual (repair manual). Page 19

Read Panasonic CF-28 Service Manual online

4.4.3 LCD DIAGNOSIS
Make sure that connecting cables, connectors and AC adapter are not loose or disconnected prior to 
testing.
Component
Source of
problem
No.
Symptom
Troubleshooting
procedures
No.
Result
1
YES
Brigntness
adjustment
1-1
Does the LCD display
properly after brightness
level is adjusted?
No picture appears on the
screen.
Brigntness
adjustment
2
2-1
Does the LCD display
properly after brightness
level is adjusted?
Display is too dark or too
bright.
LCD
Go to No. 3-2
3
3-1
Replace the LCD.
Does operation return to
normal.
Part of the screen does
not display properly.
Display quality poor.
(Fuzzy or slanted, etc.)
NO
YES
NO
Go to No. 1-2
Go to No. 2-2
CN9
IC20
LCD
2-2
Replace the LCD.
Does operation return to
normal?
2-3
Replace the Main PCB.
Does operation return to
normal?
YES
NO
YES
NO
Main PCB
LCD cable
IC6
YES
NO
Inverter PCB
Go to No. 4-2
4
4-1
Replace the Inverter PCB.
Does operation returnt o
normal?
Backlight does not turn on.
YES
NO
Main PCB
LCD cable
IC6
3-2
Replace the Main PCB.
Does operation return to
normal?
YES
NO
Go to No. 2-3
Main PCB
YES
NO
LCD cable
YES
LCD
1-2
Replace the LCD.
Does operation return to
normal?
1-3
Replace the Main PCB.
Does operation return to
normal?
NO
Go to No. 1-3
Inverter cable
Go to No. 4-3
4-2
Replace the Inverter cable.
Does operation return to
normal?
YES
NO
Backlight
Main PCB
CN9
IC20
4-3
Replace the backlight.
Does operation return to
normal?
YES
NO
4 - 7

Display

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