Panasonic CF-73SCUTSBM Service Manual - Page 20

LCD DIAGNOSIS, Replace the Main PCB.

Get Panasonic CF-73SCUTSBM - Toughbook 73 - Pentium M 1.86 GHz PDF manuals and user guides
UPC - 092281843346
View all Panasonic CF-73SCUTSBM manuals
Add to My Manuals
Save this manual to your list of manuals

Page 20 highlights

9.3 LCD DIAGNOSIS 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 Source of No. procedures Result problem 1-1 Does the LCD display properly after brightness level YES Brightness adjustment is adjusted? NO Go to No.1-2 Replace the LCD. 1-2 Does operation return to normal? YES LCD NO Go to No.1-3 Replace the Main PCB. 1-3 Does operation return to normal? YES Main PCB NO LCD cable 2-1 Does the LCD display properly after brightness level YES Brightness adjustment is adjusted? NO Go to No.2-2 Replace the LCD. 2-2 Does operation return to normal? YES LCD NO Go to No.2-3 Replace the Main PCB. 2-3 Does operation return to normal? Replace the LCD. 3-1 Does operation return to normal? YES Main PCB NO LCD cable YES LCD NO Go to No.3-2 Replace the Main PCB. 3-2 Does operation return to normal? YES Main PCB NO LCD cable Replace the Inverter PCB. 4-1 Does operation return to normal? YES Inverter PCB NO Go to No. 4-2 Replace the Inverter cable. 4-2 Does operation return to normal? YES Inverter cable NO Go to No. 4-3 Replace the Backlight. 4-3 Does operation return to normal? YES Backlight NO Main PCB Component IC800 CN801 IC14 IC800 CN801 IC14 17

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
Make sure that connecting cables, connectors and AC adapter are not loose or disconnected prior to testing.
No.
Result
YES
Brightness
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
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?
3
Part of the screen does
not display properly.
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?
1-1
Replace the LCD.
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?
1-2
Does the LCD display
properly after brightness level
is adjusted?
2
Display is too dark or too
bright.
Replace the LCD.
Does operation return to
normal?
2-2
2-3
Replace the Main PCB.
Does operation return to
normal?
3-1
Replace the LCD.
Does operation return to
normal?
4
Backlight does not turn
on.
Replace the Inverter PCB.
Does operation return to
normal?
Replace the Inverter cable.
Does operation return to
normal?
4-1
4-2
4-3
Replace the Backlight.
Does operation return to
normal?
17