Lcd dianosis – Panasonic CF-72 User Manual
Page 19
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4.4.3.
LCD DIANOSIS
Make sure that connecting cables, connectors and AC adapter are not loose or disconnected prior to testing.
15
PCI failur
Go to No. 15-2
Does the system return to
normal if the expansion card
is removed?
YES
Main PCB
NO
IC2
15-1
Expansion card
Replace the expansion card.
Does operation return to
normal?
YES
Main PCB
NO
IC2
15-2
Component
Source of
problem
No.
Symptom
Troubleshooting
procedures
No.
Result
13
Does resetting the date/time
in SETUP correct the
problem?
13-1
Real time Clock is not
updating
Error during
SETUP
YES
Main PCB
NO
IC3
14
Replace the expansion RAM
card.
Does operation return to
normal? (Go to “NO” if not
connected.)
14-1
Memory size/data error
Expansion RAM
card
YES
Main PCB
NO
IC2
IC10
17
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
CN903
IC49
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
IC4
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
IC4
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
CN903
IC49
4-3
Replace the backlight.
Does operation return to
normal?
YES
NO