IBM Thinkpad T40 Manual

							Symptom or error FRU or action, in sequence
1802
Unauthorized network card is
plugged in—Power off and
remove the miniPCI network
card.1.Remove Mini PCI network
card.
2. System board.
1803
Unauthorized daughter card is
plugged in—Power off and
remove the daughter card.1.Remove the daughter
card that you installed.
2. System board.
1810
Hard disk partition layout error1.If the Access IBM
Predesktop Area has been
previously disabled, then
go the 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
runRECOVER TO
FACTORY CONTENTSin
Access IBM Predesktop
Area.
3. If item 2 failed, press F3 in
welcome screen in
RECOVER TO FACTORY
CONTENTS. Run FDISK,
and then delete all
partitions. RunRECOVER
TO FACTORY CONTENTS
in Access IBM Predesktop
Area again.
4. If item 3 failed, select
CD-ROM boot inStartupin
Access IBM Predesktop
Area. Boot from Recovery
CD and perform full
recovery from it.
5. If item 4 failed, replace the
hard-disk drive.Symptom-to-FRU index
ThinkPad T40 Series57 
						

							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  to
resume.The IBM Predesktop Area in
the HDD is broken. To use
the IBM Predesktop Area, get
a recovery CD, and recover
the IBM Predesktop area
using it. Symptom-to-FRU index
58ThinkPad T40 Series (MT 2373, 2374, 2375, 2376) 
						

							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 54.
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 cursor appears.Reinstall 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.Start the ThinkPad
Configuration program and set
theScreen expansion
function.Symptom-to-FRU index
ThinkPad T40 Series59 
						

							LCD-related symptoms
ImportantThe 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:
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
60ThinkPad T40 Series (MT 2373, 2374, 2375, 2376) 
						

							Intermittent problems
Intermittent system hang problems can be due to a variety
of causes that have nothing to do with a hardware defect,
such as cosmic radiation, electrostatic discharge, or
software errors. FRU replacement should be considered
only when a problem recurs.
When analyzing an intermittent problem, do the following:
1. Run the diagnostic test for the system board in loop
modeat least 10 times.
2. If no error is detected, donotreplace any FRUs.
3. If any error is detected, replace the FRU shown by the
FRU code. Rerun the test to verify that no more errors
exist.
Undetermined problems
You are here because the diagnostic tests did not identify
which adapter or device failed, wrong devices are installed,
a short circuit is suspected, or the system is inoperative.
Follow these procedures to isolate the failing FRU (do not
isolate FRUs that have no defects).
Verify that all attached devices are supported by the
computer.
Verify that the power supply being used at the time of the
failure is operating correctly. (See“Power system
checkout”on page 39.)
1. Power off the computer.
2. Visually check each FRU for damage. Replace any
damaged FRU.
3. Remove or disconnect all of the following devices:
a. Non-IBM devices
b. Devices attached to the port replicator
c. Printer, mouse, and other external devices
d. Battery pack
e. Hard-disk drive
f. External diskette drive
g. DIMM
h. CD-ROM and diskette drive in the Ultrabay
i. PC Cards
4. Power on the computer.
5. Determine whether the problem has changed.
6. If the problem does not recur, reconnect the removed
devices one at a time until you find the failing FRU.
7. If the problem remains, replace the following FRUs one
at a time (do not replace a nondefective FRU):
a. System board
b. LCD assembly
Symptom-to-FRU index
ThinkPad T40 Series61 
						

							FRU replacement notices
This section contains notices related to removing and
replacing parts. Read this section carefully before replacing
any FRU.
Screw notices
Loose screws can cause a reliability problem. In IBM
ThinkPad computer, this problem is addressed with special
nylon-coated screws that have the following characteristics:
vThey maintain tight connections.
vThey do not easily come loose, even with shock or
vibration.
vThey are harder to tighten.
vThey should be used only once.
Do the following when you service this machine:
vKeep the screw kit (for the P/N, see“Miscellaneous
parts”on page 155) in your tool bag.
vAlways use new screws.
vUse a torque screwdriver if you have one.
Tighten screws as follows:
vPlastic to plastic
Turn an additional90 degreesafter the screw head
touches the surface of the plastic part:
90 degrees more
(Cross-section)
vLogic card to plastic
Turn an additional180 degreesafter the screw head
touches the surface of the logic card:
180 degrees more
(Cross-section)
vTorque driver
If you have a torque driver, refer to the“Torque”column
for each step.
FRU replacement notices
62ThinkPad T40 Series (MT 2373, 2374, 2375, 2376) 
						

							vMake sure you use the correct screw. If you have a
torque screwdriver, tighten all screws firmly to the torque
shown in the table.Never use a screw that you
removed. Use a new one. Make sure the screws are
tightened firmly.
Retaining serial numbers
This section includes the following descriptions:
v“Restoring the serial number of the system unit”
v“Retaining the UUID”
Restoring the serial number of the system
unit
When the computer was manufactured, the EEPROM on
the system board was loaded with the serial numbers of
the system and all major components. These numbers
need to remain the same throughout the life of the
computer.
If you replace the system board, you must restore the
serial number of the system unit to its original value.
Before replacing the system board, save the original serial
number by doing the following:
1. Install the ThinkPad Hardware Maintenance Diskette
Version 1.69, and restart the computer.
2. From the main menu, select1. Set System
Identification.
3. Select2. Read S/N data from EEPROM.
The serial number for each device is displayed. Write
down the serial number of the system unit, designated as
follows:
20: System unit serial number
After you have replaced the system board, restore the
serial number by doing the following:
1. Install the ThinkPad Hardware Maintenance Diskette
Version 1.69 and restart the computer.
2. From the main menu, select1. Set System
Identification.
3. Select1. Add S/N data from EEPROM.
Follow the instructions on the screen.
Note:The serial number of the system unit is written on
the label attached on the bottom of the computer.
Retaining the UUIDThe Universally Unique Identifier (UUID) is a 128-bit
number uniquely assigned to your computer at production
FRU replacement notices
ThinkPad T40 Series63 
						

							and stored in the EEPROM of your system board. The
algorithm that generates the number is designed to provide
unique IDs until the year A.D. 3400. No two computers in
the world have the same number.
When you replace the system board, you must set the
UUID on the new system board as follows:
1. Install the ThinkPad Hardware Maintenance Diskette
Version 1.69, and restart the computer.
2. From the main menu, select4. Assign UUID.
A new UUID is created and written. If a valid UUID
already exists, it is not overwritten.
FRU replacement notices
64ThinkPad T40 Series (MT 2373, 2374, 2375, 2376) 
						

							Removing and replacing a FRU
This section presents directions and drawings for use in
removing and replacing a FRU. Be sure to observe the
following general rules:
1. Do not try to service any computer unless you have
been trained and certified. An untrained person runs
the risk of damaging parts.
2. Before replacing any FRU, review“FRU replacement
notices”on page 62.
3. Begin by removing any FRUs that have to be removed
before the failing FRU. Any such FRUs are listed at the
top of the page. Remove them in the order in which
they are listed.
4. Follow the correct sequence in the steps for removing
the FRU, as indicated in the drawings by the numbers
in square callouts.
5. When turning a screw to replace a FRU, turn it in the
direction indicated by the arrow in the drawing.
6. When removing the FRU, move it in the direction
indicated by the arrow in the drawing.
7. To put the new FRU in place, reverse the removal
procedure and follow any notes that pertain to
replacement. For information about connecting and
arranging internal cables, see“Locations”on page 134.
8. When replacing a FRU, use the correct screw as
shown in the procedures.
DANGER
Attention:Before the computer is powered on after FRU
replacement, make sure that all screws, springs, and other
small parts are in place and are not loose inside the
computer. Verify this by shaking the computer gently and
listening for rattling sounds. Metallic parts or metal flakes
can cause electrical short circuits.
Attention:The system board is sensitive to, and can be
damaged by, electrostatic discharge. Before touching it,
establish personal grounding by touching a ground point
with one hand or by using an electrostatic discharge (ESD)
strap (P/N 6405959).Before removing any FRU, power off the computer,
unplug all power cords from electrical outlets,
remove the battery pack, and then disconnect any
interconnecting cables.
Removing and replacing a FRU
ThinkPad T40 Series65 
						

							1010 Battery pack
DANGER
1
(continued)Use only the battery specified in the parts list for
your computer. Any other battery could ignite or
explode.
Removing and replacing a FRU
66ThinkPad T40 Series (MT 2373, 2374, 2375, 2376)