Lenovo MT 1872, MT 1873, MT 1874, MT 1875, MT 1876, MT 2877 LCD-related symptoms

LCD-related symptoms

Important

The TFT LCD for the notebook computer contains

many thin-film transistors (TFTs). The presence of 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 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.

Note: A bright dot means a pixel is always on

(white or color.) A dark dot means a pixel is

always off (black color.)

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

ThinkPad T43 Series 65

Contents

Main ThinkPad Computer Hardware Maintenance Manual Page Contents Lenovo 2005. Portions IBM Corp. 2005. iii iv Contents v Page About this manual This manual contains service and reference information for ThinkPad Lenovo 2005. Portions IBM Corp. 2005. 1 Page Introduction Important service information Lenovo 2005. Portions IBM Corp. 2005. 3 Strategy for replacing FRUs Strategy for replacing a hard disk drive Always try to run a low-level format before replacing a hard disk drive. 4 How to use error messages Strategy for replacing FRUs for CTO, CMV, and GAV Product definition FRU identification for CTO, CMV, and GAV products Introduction 5 Using PEW Using eSupport Using the HMM 6 Important information about replacing RoHS compliant FRUs Introduction 7 Products marketed before June 2006 Products marketed after June 2006 Current or original part drive Diskette compatibility matrix 8 Diskette capacity Safety notices: multilingual translations Important service information Safety notice 1 Introduction 9 Safety notice 2 10 (continuation of safety notice 2) Introduction Safety notice 3 12 (continued) Introduction 13 Safety notice 4 14 (continuation of safety notice 4) Introduction 15 Safety notice 5 16 Safety notice 6 Introduction 17 Safety notice 7 18 Safety notice 8 Introduction 19 Safety information 20 General safety Introduction 21 Electrical safety Observe the following rules when working on electrical equipment. 22 Safety inspection guide Introduction 23 Handling devices that are sensitive to electrostatic discharge 24 Use the round ground prong of the ac plug on ac-operated computers. Grounding requirements Introduction 25 Laser compliance statement 26 CAUTION: Introduction 27 28 General descriptions The desciptions in this chapter apply to any ThinkPad model that has the PC-Doctor Lenovo 2005. Portions IBM Corp. 2005. 29 program. Some descriptions might not apply to your particular computer. Read this first 30 Read this first Related service information This section provides information about the following: v Service Web site v v v General descriptions 31 Service Web site Restoring the pre-installed system Passwords 32 General descriptions 33 How to remove the power-on password How to remove the hard-disk password 34 Power management General descriptions 35 Screen blank mode Standby mode Hibernation mode 36 General descriptions 37 Checkout guide 38 Testing the computer Creating the PC-Doctor diagnostics diskette General descriptions 39 40 Detecting system information with PC-Doctor Hardware Info Utility Power system checkout 42 (16-10V) Checking the ac adapter Pin Voltage (V dc) 1 +15.5 to +17.0 2 Ground Checking operational charging General descriptions 43 1(+) 5(-) Checking the battery pack Checking the backup battery 44 Red (+) Black (-) Wire Voltage (V dc) Red +2.5 to +3.2 Black Ground v v v replacement, replace the system board. ThinkPad T43 Series Lenovo 2005. Portions IBM Corp. 2005. 45 46 Product overview This section presents the following product-unique information: v v v v ThinkPad T43 Series 47 (continued) Specifications 48 ThinkPad T43 Series 49 Status indicators The system status indicators show the status of the computer, as follows: 50 Indicator Meaning 1 Ultrabay Slim status (continued) ThinkPad T43 Series 51 Product overview Indicator Meaning 5 Drive in use 52 R Product overview FRU tests The following table shows the test for each FRU. ThinkPad T43 Series 53 (continued) Product overview 54 Product overview Fn key combinations ThinkPad T43 Series 55 (continued) combination Product overview 56 Product overview Key combination ThinkPad T43 Series 57 Product overview Symptom-to-FRU index 58 Numeric error codes 0175 Bad CRC1, stop POST taskThe EEPROM checksum is not correct. System board. 0176 System SecurityThe system has been tampered with. ThinkPad T43 Series 59 60 ThinkPad T43 Series 61 Error messages 62 ThinkPad T43 Series 63 Beep symptoms No-beep symptoms 64 LCD-related symptoms ThinkPad T43 Series 65 No beep, power-on indicator on, and a blank LCD during POST. System board. v v v adjusted. v adjusted. 1. Reseat the LCD connectors. 2. LCD assembly. 3. System board. v v v v Intermittent problems 66 Undetermined problems FRU replacement notices ThinkPad T43 Series 67 (Cross-section) Screw notices 90degrees more Retaining serial numbers This section includes the following descriptions: v v v 68 Restoring the serial number of the system unit Retaining the UUID ThinkPad T43 Series 69 Reading or writing the ECA information 70 Removing and replacing a FRU ThinkPad T43 Series 71 1010 Battery pack (14.1-in. LCD models) 72 ThinkPad T43 Series 73 a b 1020 Battery pack (15.0-in. LCD models) 74 1030 Ultrabay Slim device ThinkPad T43 Series 75 1040 Hard disk drive 76 (continued) v Note: Page 1050 DIMM (optional) 78 ThinkPad T43 Series 79 1060 Keyboard For access, remove this FRU: v 80 (continued) 1 3 ThinkPad T43 Series 81 When installing: 1. Attach the connector 1. 82 (continued) ThinkPad T43 Series 83 b b 1070 DIMM (standard) For access, remove these FRUs in order: v v 84 1080 Modem daughter card (MDC-2) For access, remove these FRUs in order: v v ThinkPad T43 Series 85 Turn the card over 3 , and detach the modem connector 4. 86 1090 Bluetooth /Modem daughter card (BMDC-3) For access, remove these FRUs in order: v v ThinkPad T43 Series 87 88 1100 Palm rest or Palm rest with fingerprint reader (14.1-in. LCD models) For access, remove these FRUs in order: v v ThinkPad T43 Series 89 3a 3 11 1 1 90 2 When installing: sure that connector 4 is firmly attached. ThinkPad T43 Series 91 1110 Keyboard bezel or Keyboard bezel with fingerprint reader (15.0-in. LCD models) For access, remove these FRUs in order: v v 92 (continued) 1 1 ThinkPad T43 Series 93 M2 14 mm, bind-head, nylon-coated (6) Removing and replacing a FRU 94 (continued) 3. Attach the touch pad connector 4. ThinkPad T43 Series 95 (continued) 96 5. Attach the keyboard. (continued) ThinkPad T43 Series 97 1120 Mini PCI adapter 98 (continued) ThinkPad T43 Series 99 1130 Fan assembly 100 (continued) 2 ThinkPad T43 Series 101 a 102 2b (continued) 2a ThinkPad T43 Series 103 1140 Backup battery 104 (continued) When installing: 2 is firmly attached. ThinkPad T43 Series 105 1150 Speaker assembly 1a 1b 106 Step Screw (quantity) Color Torque 1a M2 10 mm, flat-head, nylon-coated (2) (2.5 kgfcm) 1b In step 3 , release the speaker cables from the cable guide. ThinkPad T43 Series 107 1160 Keyboard bezel (14.1-in. LCD models) 1 M2 19 mm, bind-head, nylon-coated (2) 108 Removing and replacing a FRU ThinkPad T43 Series 109 1170 PC Card/ExpressCard slots (14.1-in. LCD models) 110 (continued) 1 M2 4 mm, bind-head, nylon-coated (2) Removing and replacing a FRU ThinkPad T43 Series 1180 PC Card/ExpressCard slots (15.0-in. LCD models) 1 M2 5 mm, flat-head, nylon-coated (2) 112 Removing and replacing a FRU ThinkPad T43 Series 1190 LCD assembly (14.1-in. LCD models) 114 (continued) 1 M2.5 4.8 mm, bind-head, nylon-coated (4) Removing and replacing a FRU ThinkPad T43 Series Step Screw (quantity) Color Torque 5 M2 10 mm, flat-head, nylon-coated (1) 116 Removing and replacing a FRU Release the antenna cables from the cable guide 6 . When installing: correctly routed and securely in place. (continued) ThinkPad T43 Series 118 1200 LCD assembly (15.0-in. LCD models) ThinkPad T43 Series (continued) Step Screw (quantity) Color Torque 2 M2 12 mm, flat-head, nylon-coated (1) 120 Removing and replacing a FRU Step Screw (quantity) Color Torque 4 M2 10 mm, flat-head, nylon-coated (3) (continued) Removing and replacing a FRU ThinkPad T43 Series 121 Release the antenna cables from the cable guide 5 . 122 When installing: correctly routed and securely in place. (continued) ThinkPad T43 Series 123 1210 CPU 124 b a 1220 Ultrabay Slim guide rail assembly (14.1-in. LCD models) ThinkPad T43 Series 125 (continued) 1 M2 14 mm, bind-head, nylon-coated (1) (2.0 kgfcm) 2 M2 4 mm, bind-head, nylon-coated (1) 126 (2.5 kgfcm) 4 M2 3 mm, small-head, nylon-coated (3) Removing and replacing a FRU 1230 Ultrabay Slim guide rail assembly (15.0-in. LCD models) ThinkPad T43 Series 127 (continued) 1 M2 5 mm, flat-head, nylon-coated (2) (2.0 kgfcm) 2 M2 14 mm, bind-head, nylon-coated (1) 128 (2.5 kgfcm) 4 M2 3 mm, small-head, nylon-coated (2) Removing and replacing a FRU ThinkPad T43 Series 129 1240 VGA and Ultrabay Slim device eject button cable 130 Step Screw (quantity) Color Torque 4 M2 4 mm, bind-head, nylon-coated (1) When installing: Make sure that the connector 1 is firmly attached. Removing and replacing a FRU ThinkPad T43 Series 131 1250 System board and base cover (14.1-in. LCD models) 132 ThinkPad T43 Series 133 134 When installing: Make sure that the connectors 2 are firmly attached to the system board. ThinkPad T43 Series 135 136 Step Screw (quantity) Color Torque 6 M2 3 mm, small-head, nylon-coated (1) (2.5 kgfcm) 7 M2 10 mm, flat-head, nylon-coated (1) Removing and replacing a FRU ThinkPad T43 Series 137 138 Gold 0.392 Nm Removing and replacing a FRU b ThinkPad T43 Series 139 b a 1260 System board, interposer card, and base cover (15.0-in. LCD models) 140 ThinkPad T43 Series 141 142 Remove the support structure a and the EMI bracket b. 3 ThinkPad T43 Series 143 (continued) a 144 4 c Step Screw (quantity) Color Torque 4 M2 10 mm, flat-head, nylon-coated (1) (2.5 kgfcm) 5 M2.5 4.8 mm, bind-head, nylon-coated (1) e Step Screw (quantity) Color Torque 8 M2 4 mm, bind-head, nylon-coated (3) ThinkPad T43 Series 145 Removing and replacing a FRU 10 f g 12 13 146 Gold 0.392 Nm Removing and replacing a FRU b ThinkPad T43 Series 147 b a 2010 LCD front bezel (14.1-in. LCD models) cap 148 Screw (quantity) Color Torque 1 M2 3 mm, pan-head, nylon-coated (2) ThinkPad T43 Series 149 2020 LCD front bezel (15.0-in. LCD models) 150 (continued) cap Screw (quantity) Color Torque 1 Page 2030 Inverter card (14.1-in. LCD models) 152 1 M2 3 mm, small-head, nylon-coated (1) When installing: Make sure that connectors 2 and 3 are firmly attached. Removing and replacing a FRU Cable routing: the connector cable as in this figure: ThinkPad T43 Series 153 2040 Inverter card (15.0-in. LCD models) 154 Page Peel the tape securing the Bluetooth wireless antenna assembly 3 . 156 4 M2 2.7 mm, small-head, nylon-coated (2) (continued) Yellow 0.245 Nm Removing and replacing a FRU In step 6 , remove the latch bar as in this figure. ThinkPad T43 Series 157 (continued) Step Screw (quantity) Color Torque 9 M2 3 mm, small-head, nylon-coated (1) 158 Removing and replacing a FRU 14 ThinkPad T43 Series 159 (continued) 13 10a 160 15 (continued) 16 17 17 19 (continued) ThinkPad T43 Series 161 Remove the right latch from the LCD cover. 162 When installing: reassemble the LCD unit. 1. Attach the left latch to the LCD cover. (continued) ThinkPad T43 Series 163 164 95.5 mm 68.5 mm 41.5 mm 6. Route the wireless LAN antenna cables as in the following drawings: a. (continued) ThinkPad T43 Series 165 166 d. Coil the spiral tube round the antenna cables 6. e. Slide the spiral tube in the direction shown by arrow 7. ThinkPad T43 Series 167 (continued) 168 8a ThinkPad T43 Series 169 (continued) 1 M2 4 mm, bind-head, nylon-coated (7) Removing and replacing a FRU 170 (continued) 6 6 (continued) 6b 67 7 ThinkPad T43 Series 171 b Step Screw (quantity) Color Torque 6 M2 3 mm, bind-head, nylon-coated (4) 172 When installing: firmly attached to the LCD panel. (continued) 9 11 10b 12 9 d ThinkPad T43 Series 173 10a 9 M2 4 mm, bind-head, nylon-coated (2) 174 (continued) ThinkPad T43 Series 175 3010 ThinkPad Dock II PCI cover (Bottom view) 176 3020 ThinkPad Dock II top cover (Rear view) ThinkPad T43 Series 177 (continued) (Bottom view) 178 (continued) ThinkPad T43 Series 179 Locations Front view 180 ThinkPad T43 Series 181 Rear view 182 3 4 5 Bottom view ThinkPad T43 Series 183 Locations Parts list 184 Overall a b f c d e 186 (continued) ThinkPad T43 Series 187 188 (continued) ThinkPad T43 Series 189 190 (continued) ThinkPad T43 Series 191 192 ThinkPad T43 Series 193 14.1-in. LCD FRUs 194 14.1-in. XGA TFT ThinkPad T43 Series 195 15.0-in. LCD FRUs 196 15.0-in. XGA TFT ThinkPad T43 Series 197 15.0-in. SXGA+ IPS TFT Note: 198 Parts list Keyboard Keyboards for 15.0-in. LCD models ThinkPad T43 Series 199 (continued) 200 Keyboards for 14.1-in. LCD models (continued) ThinkPad T43 Series 201 202 Recovery CDs Windows XP Professional ThinkPad T43 Series 203 Windows XP Home Edition 204 Miscellaneous parts (continued) ThinkPad T43 Series 205 206 (continued) ThinkPad T43 Series 207 AC adapters 208 Optional FRUs ID Hard disk drive, 80 GB, 9.5 mm, 4200 rpm, IBM STD ThinkPad T43 Series 209 02K7086 * AC adapter (2 pin, 120 W), LITEON for ThinkPad Mini Dock 02K7092 * AC adapter (3 pin, 120 W), LITEON for ThinkPad Mini Dock Common parts list Tools 210 Parts list Power cords (system) ThinkPad T43 Series 211 For 3-pin power cords: Power cords (ThinkPad Dock II) 212 Parts list Notices ThinkPad T43 Series 213 Notices 214 Notices Trademarks