Panasonic CF-48 Service Manual page 19

No. Symptom
13 Real time Clock is not
updating
14 Memory size/data error
15 PCI failur
4.4.3 LCD DIANOSIS
Make sure that connecting cables, connectors and AC adapter are not loose or disconnected prior to testing.
No. Symptom
1 No picture appears on the
screen.
2 Display is too dark or too
bright.
3 Part of the screen does
not display properly.
Display quality poor.
(Fuzzy or slanted, etc.)
4 Backlight does not turn on.
Troubleshooting
procedures
No.
Does resetting the date/time
13-1 in SETUP correct
problem?
Replace the expansion RAM
card.
14-1 Does operation return to
normal? (Go to "NO" if not
connected.)
Does the system return to
15-1 normal if the expansion card
is removed?
Replace the expansion card.
15-2 Does operation return to
normal?
Troubleshooting
procedures
No.
Does the LCD display
1-1 properly after brightness
level is adjusted?
Replace the LCD.
1-2 Does operation return to
normal?
Replace the Main PCB.
1-3 Does operation return to
normal?
Does the LCD display
2-1 properly after brightness
level is adjusted?
Replace the LCD.
2-2 Does operation return to
normal?
Replace the Main PCB.
2-3 Does operation return to
normal?
Replace the LCD.
3-1 Does operation return to
normal.
Replace the Main PCB.
3-2 Does operation return to
normal?
Replace the Inverter PCB.
4-1 Does operation returnt o
normal?
Replace the Inverter cable.
4-2 Does operation return to
normal?
Replace the backlight.
4-3 Does operation return to
normal?
4 - 7
Source of
problem
Result
Error during
YES
SETUP
the
NO Main PCB
Expansion RAM
YES
card
NO Main PCB
YES Go to No. 15-2
NO Main PCB
YES Expansion card
NO Main PCB
Source of
problem
Result
Brigntness
YES
adjustment
NO Go to No. 1-2
YES LCD
NO Go to No. 1-3
YES Main PCB
NO LCD cable
Brigntness
YES
adjustment
NO Go to No. 2-2
YES LCD
NO Go to No. 2-3
YES Main PCB
NO LCD cable
YES LCD
NO Go to No. 3-2
YES Main PCB
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
Component
IC13
IC3
IC5 12
IC3
IC3
Component
IC14
CN16
IC52
IC14
CN16
IC52