IBM THINKPAD A20M User Manual Page 60
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LCD-related symptoms
Important
The TFT LCD for the notebook computer contains
many thin-film transistors (TFTs). A small number of
dots that are missing, discolored, or always lighted
is characteristic of TFT LCD technology, but
excessive pixel problems can cause viewing
concerns. The LCD should be replaced if the
number of missing, discolored, or lighted dots in any
background is:
v SVGA: 5 or more bright dots, 5 or more dark
dots, or a total of 9 or more bright and dark dots.
v XGA: 8 or more bright dots, 8 or more dark dots,
or a total of 9 or more bright and dark dots.
v SXGA+: 11 or more bright dots, 13 or more dark
dots, or a total of 16 or more bright and dark
dots.
v UXGA: 11 or more bright dots, 16 or more dark
dots, or a total of 16 or more bright and dark
dots.
Note: A bright dot is a white or colored pixel that is
always on. A dark dot is a pixel that is always
off and shows as black.
Symptom or error FRU or action, in sequence
No beep, power-on indicator
on, and a blank LCD during
POST.
System board.
v LCD backlight not working.
v LCD too dark.
v LCD brightness cannot be
adjusted.
v LCD contrast cannot be
adjusted.
1. Reseat the LCD
connectors.
2. LCD assembly.
3. System board.
v LCD screen unreadable.
v Characters missing pixels.
v Screen abnormal.
v Wrong color displayed.
1. See important note for
“LCD-related symptoms”.
2. Reseat all LCD connectors.
3. LCD assembly.
4. System board.
Horizontal or vertical lines
displayed on LCD.
LCD assembly.
Symptom-to-FRU index
54 ThinkPad A20m/p, A21m/p, A22m/p
- IBM Mobile Systems 1
- ThinkPad Computer 1
- Hardware Maintenance Manual 1
- About this manual 3
- Contents 5
- Introduction 7
- How to use error messages 8
- Diskette compatibility matrix 8
- Safety notices 10
- Safety information 20
- General safety 20
- Electrical safety 21
- Safety inspection guide 22
- Handling electrostatic 23
- Grounding requirements 24
- Laser compliance statement 24
- General descriptions 29
- Read this first 30
- Related service information 31
- Service web site 31
- Product recovery program 31
- Passwords 33
- Power-on password: 34
- Hard-disk password: 34
- Supervisor password: 34
- Power management 36
- Hibernation mode 37
- Checkout guide 39
- Testing the computer 39
- PC-Doctor 41
- Power system checkout 41
- Checking the ac adapter 42
- Checking operational charging 42
- Checking the battery pack 43
- Checking the backup battery 43
- Black (-) 44
- ThinkPad A20m/p, A21m/p and 45
- Product overview 47
- Specifications 47
- Status indicators 50
- FRU tests 52
- Fn key combinations 54
- Symptom-to-FRU index 55
- Numeric error codes 55
- Error messages 58
- Beep symptoms 59
- No beep symptoms 59
- LCD-related symptoms 60
- Intermittent problems 61
- Undetermined problems 61
- 90 degrees more 62
- (Cross-section) 62
- 180 degrees more 62
- Retaining serial numbers 63
- FRU replacement notices 64
- 1010 Battery pack 66
- 1020 DIMM 67
- 1030 Mini PCI adapter 69
- For A20m/p, A21m/p series 70
- For A22m/p series 71
- 1040 Backup battery 72
- Step Screw (quantity) 73
- 1060 Ultrabay 2000 device 75
- 1070 Keyboard 77
- 1080 Keyboard CRU insulator 80
- Step Screw (quantity) Torque 81
- (4 kgfcm) 81
- 1120 Sub card 86
- 1130 PC Card slot assembly 88
- 1140 Fan assembly 89
- 1150 Diskette drive 91
- 1160 Upper shield 93
- 1170 TV card 94
- 1180 CPU socket and CPU 95
- 1190 System board and RJ45/11 97
- For A20m/p and A21m/p series 98
- Thermal rubbers location 99
- 2010 LCD assembly 100
- 2020 Front bezel 102
- 14.1-in. and 15.0-in. panels 103
- (LG)” on page 138 104
- 2030 Inverter card 105
- 2040 LCD panel 107
- (continued) 108
- Removing and replacing a FRU 110
- 3010 ThinkPad Dock PCI cover 111
- 3020 ThinkPad Dock top cover 113
- (Bottom view) 114
- Locations 118
- Front view 118
- Rear view 119
- Bottom view 120
- Parts list 121
- A series model matrix 121
- *1: Memory 128 MB 122
- AC adapter 142
- LCD FRUs 142
- 14.1-in. XGA TFT 143
- 15.0-in. XGA TFT (LG) 144
- 15.0-in. XGA TFT (SAMSUNG) 144
- 15.0-in. SXGA+ TFT 145
- 15.0-in. UXGA TFT 145
- Keyboard 146
- Recovery CDs 147
- For Windows 98 (A22p) 148
- For Windows 2000 (A22m) 149
- For Windows 2000 (A22p) 149
- Miscellaneous parts 151
- Optional FRUs 153
- Common parts list 154
- Power cords (docking station) 155
- Trademarks 156
- Part Number: 23P0896 158
- (1P) P/N: 23P0896 158
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