Lenovo ThinkPad T40 Series User manual

ThinkPad T40/T40p, T41/T41p Series
Product overview ............45
Specifications ............45
Status indicators ...........48
FRU tests .............50
Fn key combinations ..........52
Symptom-to-FRU index ..........55
Numeric error codes ..........55
Error messages ...........60
Beep symptoms ...........61
No-beep symptoms ..........61
LCD-related symptoms .........62
Intermittent problems ..........63
Undetermined problems .........63
FRU replacement notices .........64
Screw notices ............64
Retaining serial numbers.........65
Restoring the serial number of the system unit 65
Retaining the UUID .........66
Removing and replacing a FRU........67
1010 Battery pack...........68
1020 Ultrabay Slim device ........70
1030 Hard disk drive ..........71
1040 DIMM (optional) .........73
1050 Keyboard ...........75
1060 DIMM (standard) .........79
1070 Modem daughter card (MDC) .....80
1080 Bluetooth/Modem daughter card (BMDC) 82
1090 Palm rest ...........84
1100 Mini PCI adapter .........86
1110 Fan assembly ..........89
1120 Backup battery ..........90
1130 Speaker assembly .........92
1140 PC Card slot assembly .......94
1150 Keyboard bezel..........96
1160 LCD assembly ..........98
1170CPU.............103
1180 Ultrabay Slim guide rail assembly ....104
1190 VGA and Ultrabay Slim device eject button
cable .............106
1200 System board and base cover .....108
2010 LCD front bezel .........116
2020 Inverter card ..........118
2030 Bluetooth wireless antenna assembly . . . 119
2040 LCD panel, LCD cable assembly, wireless
LAN antenna assembly, hinges, and LCD cover. 121
3010 ThinkPad Dock II PCI cover......134
3020 ThinkPad Dock II top cover ......135
Locations ..............138
Front view ............138
Rear view.............140
© Copyright IBM Corp. 2003 43

Bottom view ............141
Parts list ..............142
T40/T40p, T41/T41p series model matrix . . . 142
Overall .............153
LCD FRUs ............168
14.1-in. XGA TFT .........169
14.1-in. SXGA+ TFT ........172
Keyboard .............174
Recovery CDs ...........175
For Windows XP Professional (T40/T40p
series) ............175
For Windows 2000 (T40/T40p series) . . . 176
For Windows XP Professional (T41/T41p
series) ............177
For Windows 2000 (T41 series) .....178
Miscellaneous parts ..........178
AC adapters ............181
Optional FRUs ...........181
Common parts list ..........182
Tools .............182
Power cords (system) ........182
Power cords (ThinkPad Dock and ThinkPad
Dock II) ...........183
Notices ..............184
Trademarks ............184
44 MT 2373/2374/2375/2376/2378/2379

Product overview
This section presents the following product-unique
information:
v“Specifications”
v“Status indicators”on page 48
v“FRU tests”on page 50
v“Fn key combinations”on page 52
Specifications
The following table lists the specifications of the ThinkPad
T40/ T40p, T41/T41p series:
Feature Description
Processor T40/T40p series:
vIntel
®
Pentium
®
M processor 1.3 GHz,
L2 1-MB cache
vIntel
®
Pentium
®
M processor 1.5 GHz,
L2 1-MB cache
vIntel
®
Pentium
®
M processor 1.6 GHz,
L2 1-MB cache
T41/T41p series:
vIntel
®
Pentium
®
M processor 1.4 GHz,
L2 1-MB cache
vIntel
®
Pentium
®
M processor 1.6 GHz,
L2 1-MB cache
vIntel
®
Pentium
®
M processor 1.7 GHz,
L2 1-MB cache
Bus architecture T40/T40p series:
v400 MHz PSB (Processor System Bus)
v266 MHz DDR SDRAM (PC2100)
vHUB link
vPCI bus
vLPC bus
T41/T41p series:
v400 MHz PSB (Processor System Bus)
v333 MHz DDR SDRAM (PC2700)
vHUB link
vPCI bus
vLPC bus
Graphic memory
chip T40/T40p series: v16 MB DDR SDRAM (ATI M6-16)
v32 MB DDR SDRAM (ATI M7-32)
v32 MB DDR SDRAM (ATI M9-32)
v64 MB DDR SDRAM (ATI M9 GL-64)
T41/T41p series:
v32 MB DDR SDRAM (ATI M7-32)
v32 MB DDR SDRAM (ATI M9-32)
v128 MB DDR SDRAM (ATI M10 GL-128)
(continued)
Product overview
ThinkPad T40/T40p, T41/T41p Series 45

Feature Description
Display v14.1-inch, 16M colors, XGA (1024 ×768
resolution) TFT color LCD
v14.1-inch, 16M colors, SXGA+ (1400 ×
1050 resolution) TFT color LCD
Standard memory T40/T40p series:
v256 MB DDR SDRAM SO-DIMM
(PC2100) card ×1
v512 MB DDR SDRAM SO-DIMM
(PC2100) card ×1
v1 GB DDR SDRAM SO-DIMM (PC2100)
card ×1
T41/T41p series:
v256 MB DDR SDRAM SO-DIMM
(PC2700) card ×1
v512 MB DDR SDRAM SO-DIMM
(PC2700) card ×1
v1 GB DDR SDRAM SO-DIMM (PC2700)
card ×1
Optional memory T40/T40p series:
v128 MB DDR SDRAM SO-DIMM
(PC2100) card
v256 MB DDR SDRAM SO-DIMM
(PC2100) card
v512 MB DDR SDRAM SO-DIMM
(PC2100)
v1 GB DDR SDRAM SO-DIMM (PC2100)
T41/T41p series:
v128 MB DDR SDRAM SO-DIMM
(PC2700) card ×1
v256 MB DDR SDRAM SO-DIMM
(PC2700) card ×1
v512 MB DDR SDRAM SO-DIMM
(PC2700) card ×1
v1 GB DDR SDRAM SO-DIMM (PC2700)
card ×1
(maximum of 2048 MB)
CMOS RAM v242 bytes
Hard disk drive v20.0 GB, 4200 rpm, 2.5-inch, IDE
interface (supported by CTO in T40
series)
v30.0 GB, 4200 rpm, 2.5-inch, IDE
interface
v40.0 GB, 5400 rpm, 2.5-inch, IDE
interface
v60.0 GB, 7200 rpm, 2.5-inch, IDE
interface
v80.0 GB, 4200 rpm, 2.5-inch, IDE
interface (option in T41 series)
(continued)
Product overview
46 MT 2373/2374/2375/2376/2378/2379

Feature Description
Ultrabay Slim device
(standard)
vDVD drive, 9.5 mm high
vDVD/CD-RW combo drive, 9.5 mm high
I/O port vExternal monitor connector
vStereo headphone jack
vMonaural microphone jack
vInfrared port
vParallel connector
vDocking connector
vRJ11 connector
vRJ45 connector
vTV-out connector (S-Video)
vUniversal serial bus (USB) connector ×
2 (compatible with USB 1.1 and 2.0)
Internal modem v56.6 Kbps
Audio vBuilt-in stereo speakers
vSoftware control volume
Infrared transfer vIrDA 1.1
Mini PCI adapter T40/T40p series:
vIBM Dual-Band 11a/b Wi-Fi Wireless
Mini PCI Adapter
vCisco Aironet Wireless 802.11b
vIntel
®
PRO/Wireless LAN 2100 3B Mini
PCI Adapter
T41/T41p series:
vCisco Aironet Wireless 802.11b
vIntel
®
PRO/Wireless LAN 2100 3B Mini
PCI Adapter
vIBM 11a/b/g Wireless LAN Mini PCI
Adapter
PC Card vOne Type-III
vTwo Type-II
Ethernet (on the
system board) T40/T40p series: v10/100Base Ethernet
vGigabit Ethernet
T41/T41p series:
vGigabit Ethernet
Communication
daughter card
(CDC)
vV.90 modem daughter card (MDC)
vIBM Integrated Bluetooth with 56K
Modem (BMDC)
Touch pad vUltraNav
ThinkLight Yes
Battery vLi-ion battery (6 cells)
vLi-ion battery (9 cells)
vUltrabay Slim Li Polymer battery (option)
AC adapter v72-watt type
Preinstalled
operating system
vWindows XP Professional
vWindows 2000
Product overview
ThinkPad T40/T40p, T41/T41p Series 47

Status indicators
The system status indicators show the status of the
computer, as follows:
2223242526272829
1
2
8
3
Product overview
48 MT 2373/2374/2375/2376/2378/2379

Indicator Meaning
1 Ultrabay
Slim status Green:
An Ultrabay Slim device is installed and in
use.
Blinking green:
An Ultrabay Slim device is in the process of
being detached.
Turn off:
An Ultrabay Slim device is ready to be
attached or detached.
Note: If you are using Windows 2000, the
Ultrabay Slim status indicator does not blink
while an Ultrabay Slim device is being
detached. Instead, a message box pops up
when the process is completed; then the
indicator turns off.
2 Standby
status Green:
The computer is in standby mode.
Blinking green:
The computer is entering standby mode or
hibernation mode, or is resuming normal
operation.
3 Battery
status Green:
The battery is in use and has enough
power. The ac adapter has charged the
battery completely.
Blinking green:
The battery is being charged, but still has
enough power to operate. (At regular
intervals, the indicator light turns off briefly.)
Orange:
The battery is being charged, but the battery
power is still low.
Blinking orange:
The battery needs to be charged. When the
indicator starts blinking orange, the
computer beeps three times.
4 Power on Green:
The computer is on and ready to use. This
indicator stays lit whenever the computer is
on and is not in standby mode.
5 Drive in
use Green:
Data is being read from or written to the
hard disk drive, the diskette drive, or the
drive in the Ultrabay Slim device. When this
indicator is on, do not put the computer into
standby mode or turn off the computer.
Note: Do not move the system while the green
drive-in-use light is on. Sudden physical shock
could cause drive errors.
(continued)
Product overview
ThinkPad T40/T40p, T41/T41p Series 49

Indicator Meaning
6 Caps lock Green:
Caps Lock mode is enabled. To enable or
disable Caps Lock mode, press the Caps
Lock key.
7 Num lock Green:
The numeric keypad on the keyboard is
enabled. To enable or disable the keypad,
press and hold the Shift key, and press the
NumLk (ScrLk) key.
8 Bluetooth
status
R
Green:
Bluetooth wireless is operational. This
indicator is on when Bluetooth wireless is on
and not in suspend mode.
9 Wireless
status Green:
The wireless feature (the IEEE 802.11
standard) is on, and the radio link is ready
for use.
Blinking green:
Data is being transmitted.
FRU tests
The following table shows the test for each FRU.
FRU Applicable test
System board 1. Diagnostics --> CPU/Coprocessor
2. Diagnostics --> Systemboard
3. If the docking station or the port replicator
is attached to the ThinkPad computer,
undock it. Place the computer on a
horizontal surface, and run Diagnostics -->
Other Devices --> IBM HDD Active
Protection Test.
Note: Do not apply any physical shock to
the computer while the test is running.
Power Diagnostics --> Other Devices --> IBM AC
Adapter,IBM Battery 1 (IBM Battery 2)
LCD unit 1. Diagnostics --> Video Adapter
2. Interactive Tests --> Video
Modem
daughter card
(MDC or
BMDC)
1. Make sure the modem is set up correctly.
2. Replace the modem jack and the modem
card in turn, and run the following tests in
Diagnostics --> Communication:
a. Lucent Soft Modem Loopback
b. Lucent Soft Modem Dialtone
Audio 1. Interactive Tests --> Internal Speaker
2. Diagnostics --> Other Devices --> Analog
Devices AC97 CODEC Test
(continued)
Product overview
50 MT 2373/2374/2375/2376/2378/2379

FRU Applicable test
Speaker Interactive Tests --> Internal Speaker
PC Card slots 1. Diagnostics --> Systemboard -->
PCMCIA
2. Insert a PC Card Wrap Plug into every PC
Card slot, and run Diagnostics -->
Systemboard --> PCMCIA External Loop
Keyboard 1. Diagnostics --> Systemboard -->
Keyboard
2. Interactive Tests --> Keyboard
Hard disk drive Diagnostics --> Fixed Disks
Diskette drive 1. Diagnostics --> Diskette Drives
2. Interactive Tests --> Diskette
DVD drive or
DVD/CD-RW
combo drive
1. Diagnostics --> Other Devices -->
CD-ROM/DVD
2. Interactive Tests --> CD-ROM/DVD Test
Memory 1. If two DIMMs are installed, remove one of
them and run Diagnostics --> Memory
Test—Quick.
2. If the problem does not recur, return the
DIMM to its place, remove the other one,
and run the test again.
3. If the test does not detect the error, run
Diagnostics --> Memory Test—Full.
Fan 1. Turn on the computer and check the air
turbulence at the louver near the PC Card
slot.
2. Run Diagnostics --> Other Devices -->
IBM Fan.
TrackPoint or
pointing device If the TrackPoint does not work, check the configuration as specified in the ThinkPad
Configuration program. If the TrackPoint is
disabled, select Automatic to enable it.
After you use the TrackPoint, the pointer may
drift on the screen for a short time. This drift
can occur when a slight, steady pressure is
applied to the TrackPoint pointer. This symptom
is not a hardware problem. If the pointer stops
after a short time, no service action is
necessary.
If enabling the TrackPoint does not correct the
problem, continue with the following:
vInteractive Tests --> Mouse
Touch Pad If the Touch Pad does not work, check the
configuration as specified in the ThinkPad
Configuration program. If the Touch Pad is
disabled, select Automatic to enable it. If
enabling the Touch Pad does not correct the
problem, continue with the following:
vInteractive Tests --> Mouse
Product overview
ThinkPad T40/T40p, T41/T41p Series 51

Fn key combinations
The following table shows the function of each combination
of Fn with a function key.
Key
combination Description
Fn+F1 Reserved.
Fn+F2 Reserved.
Fn+F3 Turn off the computer display, leaving the
screen blank. To turn the computer display on
again, press any key or press the TrackPoint
pointing stick.
Fn+F4 Put the computer in standby mode. To return to
normal operation, press the Fn key only,
without pressing a function key.
Notes:
1. This mode is called suspend mode in
Windows NT.
2. In Windows 2000 and Windows XP, this
combination of keys functions as a sleep
button. The setting can be changed so that
pressing it puts the computer into
hibernation mode or even shuts the
computer down.
Fn+F5 Control the power source of the built-in
Bluetooth wireless device. This combination of
the keys functions as a toggle switch of the
power state.
Note: In Windows 98, Windows 2000, or
Windows XP, this combination of keys enables
or disables the built-in wireless networking
features (the IEEE 802.11 standard) and the
Bluetooth wireless features. To use this
function, the following drivers must be installed.
vIBM ThinkPad Power Management driver
vOnScreen Display utility
vWireless device drivers
Fn+F6 Reserved.
(continued)
Product overview
52 MT 2373/2374/2375/2376/2378/2379

Key
combination Description
Fn+F7 Switch a display output location
vExternal monitor (CRT display)
vComputer display and external monitor (LCD
+ CRT display)
vComputer display (LCD)
Note: For any operating system other than
Windows 2000 or Windows XP, no additional
procedure is needed; just press Fn+F7.
Notes:
1. This function does not work when different
desktop images are displayed on the
computer display and the external monitor
(the Extend desktop function).
2. This function does not work while a DVD
movie or a video clip is playing.
3. For Windows 2000 or Windows XP, a
hotkey application might take over the
switching function.
Fn+F8 Note: This function is not supported in
Windows 2000 and Windows XP.
If the image displayed on the computer is
smaller than the physical display, switch the
computer screen size between expanded mode
and normal mode.
(continued)
Product overview
ThinkPad T40/T40p, T41/T41p Series 53

Key
combination Description
Fn+F9 Open the IBM ThinkPad EasyEject Utility
screen. Buttons for the following choices are
displayed:
vEject ThinkPad PC from Dock: This button
is displayed only if the ThinkPad computer
has been attached to a ThinkPad Dock II.
The computer can be detached from the
ThinkPad Dock II.
vEject ThinkPad PC from Mini Dock: This
button is displayed only if the ThinkPad
computer has been docked in a ThinkPad
Mini Dock and one or more USB devices
have been connected to the ThinkPad Mini
Dock. You can stop and remove all the USB
devices safely by clicking the button.
Note: If a diskette drive is connected to the
external-diskette-drive connector of the
ThinkPad Mini Dock, you cannot connect a
USB diskette drive.
vRun EasyEject Actions: This button is used
to select, stop, or remove external devices
connected to the ThinkPad computer.
vConfigure EasyEject Actions: Opens the
IBM ThinkPad EasyEject Utility main window.
vFn+F9 Settings: Configures the settings for
the Fn+F9 function.
You can use this utility to stop and remove all
ejectable devices connected to the ThinkPad
computer, the ThinkPad Mini Dock, or the
ThinkPad Port Replicator II. You cannot use it
to detach the computer from the ThinkPad Mini
Dock or the ThinkPad Port Replicator II.
Note: This function is supported only in
Windows 2000 and Windows XP.
Fn+F10 Reserved.
Fn+F11 Reserved.
Fn+F12 Put the computer into hibernation mode. To
return to normal operation, press the power
button for less than four seconds.
Note: To use Fn+F12 for hibernation in
Windows 2000 or Windows XP, you must have
the IBM PM device driver installed on the
computer.
Fn+PgUp Turn the ThinkLight on or off.
Note: This function is supported only on the
ThinkPad computers that have the ThinkLight.
The on or off status of the ThinkLight is shown
on the screen for a few seconds when you
press Fn+PgUp.
Fn+Home The computer display becomes brighter.
Fn+End The computer display becomes dimmer.
Fn+Spacebar Enable the FullScreen Magnifier function.
Product overview
54 MT 2373/2374/2375/2376/2378/2379

Symptom-to-FRU index
The symptom-to-FRU index in this section lists symptoms
and errors and their possible causes. The most likely
cause is listed first, in boldface type.
Note: Do the FRU replacement or other actions in the
sequence shown in the column headed “FRU or
action, in sequence.”If replacing a FRU does not
solve the problem, put the original part back in the
computer. Do not replace a nondefective FRU.
This index can also help you determine, during regular
servicing, what FRUs are likely to need to be replaced
next.
A numeric error is displayed for each error detected in
POST or system operation. In the displays, ncan be any
number.
If no numeric code is displayed, check the narrative
descriptions of symptoms. If the symptom is not described
there, go to “Intermittent problems”on page 63.
Note
For an IBM device not supported by diagnostic
codes in the ThinkPad notebook computers, see the
manual for that device.
Numeric error codes
Symptom or error FRU or action, in sequence
0175
Bad CRC1, stop POST
task—The EEPROM checksum
is not correct.
System board.
0176
System Security—The system
has been tampered with.
1. Run IBM BIOS Setup
Utility, and save the
current setting by
pressing F10.
2. System board.
0177
Bad SVP data, stop POST
task—The checksum of the
supervisor password in the
EEPROM is not correct.
System board
Symptom-to-FRU index
ThinkPad T40/T40p, T41/T41p Series 55

Symptom or error FRU or action, in sequence
0182
Bad CRC2. Enter BIOS Setup
and load Setup defaults.—The
checksum of the CRS2 setting
in the EEPROM is not correct.
1. Run IBM BIOS Setup
Utility. Press F9, and
Enter to load the default
setting. Then save the
current setting by
pressing F10.
2. System board.
0185
Bad startup sequence settings.
Enter BIOS Setup and load
Setup defaults.
1. Run IBM BIOS Setup
Utility. Press F9, and
Enter to load the default
setting. Then save the
current setting by
pressing F10.
0187
EAIA data access error—The
access to EEPROM is failed.
System board.
0188
Invalid RFID Serialization
Information Area.
System board.
0189
Invalid RFID configuration
information area—The
EEPROM checksum is not
correct.
System board.
0190
Critical low-battery error 1. Charge the battery pack.
2. Battery pack.
0191
System Security—Invalid
Remote Change requested.
1. Run IBM BIOS Setup
Utility, and then save
current setting by
pressing F10.
2. System board.
0192
System Security—IBM
Embedded Security hardware
tamper detected.
System board.
0199
System Security—IBM Security
password retry count exceeded.
1. Run IBM BIOS Setup
Utility, and then save the
current setting by
pressing F10.
2. System board.
01C8
Two or more modem devices
are found. Remove all but one
of them. Press <Esc> to
continue.
1. Remove either a Mini-PCI
Card or a modem
daughter card. Otherwise,
press Esc to ignore the
warning message.
2. System board.
01C9
More than one Ethernet devices
are found. Remove one of
them. Press <Esc> to continue.
1. Remove the Ethernet
device that you installed;
or press Esc to ignore the
warning message.
2. System board.
Symptom-to-FRU index
56 MT 2373/2374/2375/2376/2378/2379

Symptom or error FRU or action, in sequence
0200
Hard disk error—The hard disk
is not working.
1. Reseat the hard disk
drive.
2. Load Setup Defaults in IBM
BIOS Setup Utility.
3. Hard disk drive.
4. System board.
021x
Keyboard error. Run interactive tests of the keyboard and the auxiliary
input device.
0220
Monitor type error—Monitor
type does not match the one
specified in CMOS.
Load Setup Defaults in IBM
BIOS Setup Utility.
0230
Shadow RAM error—Shadow
RAM fails at offset nnnn.
System board.
0231
System RAM error—System
RAM fails at offset nnnn.
1. DIMM.
2. System board.
0232
Extended RAM error—
Extended RAM fails at offset
nnnn.
1. DIMM.
2. System board.
0250
System battery error—System
battery is dead.
Replace the backup battery
and run IBM BIOS Setup
Utility to reset the time and
date.
0251
System CMOS checksum
bad—Default configuration
used.
Replace the backup battery
and run IBM BIOS Setup
Utility to reset the time and
date.
0252
Password checksum bad—The
password is cleared.
Reset the password by
running IBM BIOS Setup
Utility.
0260
System timer error. 1. Replace the backup
battery and run IBM BIOS
Setup Utility to reset the
time and date.
2. System board.
0270
Real-time clock error. 1. Replace the backup
battery and run IBM BIOS
Setup Utility to reset the
time and date.
2. System board.
0271
Date and time error—Neither
the date nor the time is set in
the computer.
Run IBM BIOS Setup Utility to
reset the time and date.
0280
Previous boot incomplete—
Default configuration used.
1. Load “Setup Default”in
IBM BIOS Setup Utility.
2. DIMM.
3. System board.
Symptom-to-FRU index
ThinkPad T40/T40p, T41/T41p Series 57

Symptom or error FRU or action, in sequence
02F4
EISA CMOS not writable. 1. Load Setup Defaults in
IBM BIOS Setup Utility.
2. Replace the backup battery.
3. System board.
02F5
DMA test failed. 1. DIMM.
2. System board.
02F6
Software NMI failed 1. DIMM.
2. System board.
02F7
Fail-safe timer NMI failed 1. DIMM.
2. System board.
1802
Unauthorized network card is
plugged in—Turn off and
remove the miniPCI network
card.
1. Remove Mini PCI network
card.
2. System board.
1803
Unauthorized daughter card is
plugged in—Turn off and
remove the daughter card.
1. Remove the daughter
card that you installed.
2. System board.
Symptom-to-FRU index
58 MT 2373/2374/2375/2376/2378/2379

Symptom or error FRU or action, in sequence
1810
Hard disk partition layout error. 1. If the Access IBM
Predesktop Area has been
previously disabled, then
go to the IBM BIOS Setup
Utility by pressing F1 to
open the IBM BIOS Setup
Utility. Select Security -->
IBM Predesktop Area -->
Access IBM Predesktop
Area. Set this item to
Disabled. Save and exit.
2. If the Access IBM
Predesktop Area has not
been previously disabled,
press Enter to load Access
IBM Predesktop Area. Then
run RECOVER TO
FACTORY CONTENTS in
Access IBM Predesktop
Area.
3. If item 2 failed, press F3 in
the Welcome screen in
RECOVER TO FACTORY
CONTENTS. Run FDISK,
and then delete all
partitions. Run RECOVER
TO FACTORY CONTENTS
in Access IBM Predesktop
Area again.
4. If item 3 failed, select
CD-ROM boot in Startup in
Access IBM Predesktop
Area. Boot from the
Recovery CD and perform
full recovery from it.
5. If item 4 failed, replace the
hard disk drive.
2000
IBM Hard Drive Active
Protection sensor diagnostics
failed.
Press <Esc> to continue.
Press <F1> to enter SETUP
1. Undock docking station or
port replicator if it is
attached to the ThinkPad
computer, and place the
computer on a horizontal
surface. Do not apply any
physical shock to the
computer.
2. Run Diagnostics --> Other
Devices --> IBM HDD
Active Protection Test.
Symptom-to-FRU index
ThinkPad T40/T40p, T41/T41p Series 59

Error messages
Symptom or error FRU or action, in sequence
Device address conflict. 1. Load “Setup Defaults”in
IBM BIOS Setup Utility.
2. Backup battery.
3. System board.
Allocation error for device. 1. Load “Setup Defaults”in
IBM BIOS Setup Utility.
2. Backup battery.
3. System board.
Failing bits: nnnn. 1. DIMM.
2. System board.
Invalid system configuration
data. 1. DIMM.
2. System board.
I/O device IRQ conflict. 1. Load “Setup Defaults”in
IBM BIOS Setup Utility.
2. Backup battery.
3. System board.
Operating system not found. 1. Check that the operating
system has no failure and is
installed correctly.
2. Enter IBM BIOS Setup
Utility and see whether
the hard disk drive and
the diskette drive are
properly identified.
3. Reseat the hard disk drive.
4. Reinstall the operating
system.
5. Diskette drive.
6. Hard disk drive.
7. System board.
Hibernation error. 1. Restore the system
configuration to what it
was before the computer
entered hibernation mode.
2. If memory size has been
changed, re-create the
hibernation file.
Fan error. Fan.
Thermal sensing error. System board.
Authentication of system
services failed. Press <Esc> to
resume.
The IBM Predesktop Area in
the HDD is corrupted.
Restore it from a recovery
CD.
Symptom-to-FRU index
60 MT 2373/2374/2375/2376/2378/2379

Beep symptoms
Symptom or error FRU or action, in sequence
One beep and a blank,
unreadable, or flashing LCD. 1. Reseat the LCD
connector.
2. LCD assembly.
3. External CRT.
4. System board.
One long and two short beeps,
and a blank or unreadable
LCD.
1. System board.
2. LCD assembly.
3. DIMM.
Two short beeps with error
codes. POST error. See “Numeric error codes”on page 55.
Two short beeps and a blank
screen. 1. System board.
2. DIMM.
Three short beeps, pause,
three more short beeps, and
one short beep.
1. DIMM.
2. System board
One short beep, pause, three
short beeps, pause, three more
short beeps, and one short
beep.
Only the cursor appears. Reinstall the operating
system.
Four cycles of four short beeps
and a blank screen. System board (IBM security chip)
Five short beeps and a blank
screen. System board
No-beep symptoms
Symptom or error FRU or action, in sequence
No beep, power-on indicator
on, LCD blank, and no POST. 1. Make sure that every
connector is connected
tightly and correctly.
2. DIMM.
3. System board.
No beep, power-on indicator
on, and LCD blank during
POST.
1. Reseat DIMM.
2. System board.
The power-on password prompt
appears. A power-on password or a supervisor password is set.
Type the password and press
Enter.
The hard-disk password prompt
appears. A hard-disk password is set. Type the password and press
Enter.
The DOS full screen looks
smaller than it should. Start the ThinkPad Configuration program and set
the Screen expansion
function.
Symptom-to-FRU index
ThinkPad T40/T40p, T41/T41p Series 61

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:
vXGA: 8 or more bright dots, 8 or more dark dots,
or a total of 9 or more bright and dark dots.
vSXGA+: 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.
vLCD backlight not working.
vLCD too dark.
vLCD brightness cannot be
adjusted.
vLCD contrast cannot be
adjusted.
1. Reseat the LCD
connectors.
2. LCD assembly.
3. System board.
vLCD screen unreadable.
vCharacters missing pixels.
vScreen abnormal.
vWrong 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
62 MT 2373/2374/2375/2376/2378/2379