Panasonic Toughbook CF-48 Series, Service Manual

Page: 19 / 107

4 - 7
15 PCI failur
Go to No. 15-2
Does the system return to
normal if the expansion card
is removed?
YES
Main PCB NO IC3
15-1
Expansion card
Replace the expansion card.
Does operation return to
normal?
YES
Main PCB NO IC3
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 IC13
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
IC3
IC5 12
4.4.3 LCD DIANOSIS
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
CN16
IC52
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
IC14 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
IC14
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
CN16
IC52
4-3
Replace the backlight.
Does operation return to
normal? YES
NO