IBM ThinkPad 240 Owner's manual

S09N-8590-00
IBM Mobile Systems
ThinkPad 240
Hardware Maintenance Manual
December 2000

i

Before using this information and the product it supports,
be sure to read the general information under “Read This
First” on page 1.
Second Edition (October 1999)
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Contents
ThinkPad 240 Hardware Maintenance Manual .. 1
Read This First .................. 1
What to Do First ................ 2
How to Disable the Password ......... 3
Product Overview . . . . . . . . . . . . . . . . . 4
Fn Key Combinations ............. 5
Status Indicators . . . . . . . . . . . . . . . . 6
Checkout Guide . . . . . . . . . . . . . . . . . 7
Audio Checkout . . . . . . . . . . . . . . . . 8
Fan ASM Checkout .............. 8
Keyboard and Auxiliary Input Device Checkout . 9
Memory Checkout . . . . . . . . . . . . . . . 9
Modem Board Checkout ............ 10
Power System Checkout ............ 10
TrackPoint Checkout . . . . . . . . . . . . . . 12
I/O Ports Checkout .............. 13
Power Management Features ......... 13
Symptom-to-FRU Index . . . . . . . . . . . . . . 16
Numeric Error Codes .............. 16
Error Messages . . . . . . . . . . . . . . . . 18
No Beep Symptoms .............. 19
LCD-Related Symptoms . . . . . . . . . . . . 19
Keyboard-Related Symptoms . . . . . . . . . . 19
Indicator-Related Symptoms . . . . . . . . . . 19
Power-Related Symptoms . . . . . . . . . . . 20
PC Card (PCMCIA)-Related Symptoms ..... 20
Speaker-Related Symptoms . . . . . . . . . . 20
Power Management-Related Symptoms ..... 20
Peripheral-Device-Related Symptom . . . . . . 21
Intermittent Problems . . . . . . . . . . . . . 21
Undetermined Problems . . . . . . . . . . . . 22
CE Utility Program Diskette ............ 23
Writing the VPD Data ............. 23
Flash UUID . . . . . . . . . . . . . . . . . . 23
Running the Diagnostics .............. 23
FRU Removals and Replacements ......... 24
FRU Service Procedures ............ 24
1010 Battery ASM ............... 26
1020 Hard Disk Drive ............. 27
1030 Keyboard . . . . . . . . . . . . . . . . 28
1040 Modem Card ............... 30
1050 DIMM Card ............... 31
1060 LCD Unit ASM .............. 32
1070 Upper Cover ASM ............ 34
1080 Speaker ASM .............. 36
1085 Select Button ASM ............ 37
1090 Cable ASM and Cable ASM LED-R .... 38
1100 Fan ASM ................ 39
1110 Modem Cable ASM ............ 41
1120 Water Channel ASM ........... 42
1130 System Board .............. 43
Contents iii

1135 Rear Bracket ............... 45
1140 PCMCIA Slots .............. 46
1150 LCD Bezel ASM ............. 47
1160 LCD Inverter ASM ............ 48
1170 LCD Panel ASM (LCD Type A and B) . . . 49
1180 LCD FPC ASM (LCD Type A) ....... 51
1185 LCD FPC ASM (LCD Type B) ....... 52
1190 Hinge ASM ............... 53
Computer Parts Listing .............. 54
LCD Unit Parts Listing (LCD Type A) ........ 58
LCD Unit Parts Listing (LCD Type B) ........ 59
Service Tools . . . . . . . . . . . . . . . . . . . 59
Notices . . . . . . . . . . . . . . . . . . . . . . 61
Trademarks . . . . . . . . . . . . . . . . . . . 61
iv ThinkPad 240

ThinkPad 240 Hardware
Maintenance Manual
About This Manual
This manual contains service and reference information for
the IBM ThinkPad 240 products. Use this manual along
with the diagnostics tests to troubleshoot problems effec-
tively.
There are two models of LCD panel used with the
ThinkPad 240: LCD Type A and LCD Type B. Check the
last five letters of the unit's serial number you are servicing
to determine the model.
LCD Type A:
All ThinkPad 240 computers that have serial numbers
whose last five
alphanumeric characters are "00001" to
"YZZZZ" are fitted with Type A panels.
Note: The number range is from 00001 to 99999, and the
letter range is from AAAAA to YZZZZ.
LCD Type B:
All ThinkPad 240 computers that have serial numbers
whose last five letters are "ZAAAA" to "ZZZZZ" are fitted
with Type B panels.
The servicer need only check the fifth letter from the end.
If the fifth letter from the end is "0 — Y" (inclusive), then
the LCD panel is Type A. If the fifth letter from the end is
"Z", then the LCD panel is Type B.
The manual is divided into sections as follows:
The introduction section provides general information,
guidelines, and safety information required to service
computers.
The product-specific section includes service, refer-
ence, and product-specific parts information.
This manual is intended for trained servicers who are
familiar with ThinkPad products. Use this manual along
with the PC Doctor to troubleshoot problems effectively.
Read This First
Before you go to the checkout guide, be sure to read this
section.
Important Notes
Only certified trained personnel should service
the computer.
Read the entire FRU service procedures before
replacing any FRUs.
ThinkPad 240 1

Use new nylon-coated screws when you replace
FRUs.
Be extremely careful during write operations such
as copying, saving, or formatting. Drives in the
computer that you are servicing might have been
rearranged or the drive startup sequence might have
been altered. If you select an incorrect drive, data or
programs might be overwritten.
Replace FRUs only for the correct model. When
you replace a FRU, make sure the model of the com-
puter and FRU part number are correct by referring to
the FRU parts list.
A FRU should not be replaced because of a
single, unreproducible failure. Single failures can
occur for a variety of reasons 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 recur-
ring problem exists. If this is suspected, clear the
error log and run the test again. Do not replace any
FRUs if log errors do not reappear.
Be careful not to replace a non-defective FRU.
What to Do First
The servicer must include the following in the parts
exchange form or parts return form that is attached to the
returned FRU:
1. Name and phone number of servicer
2. Date of service
3. Date when part failed
4. Date of purchase
5. Failure symptoms, error codes appearing on the
display, and beep symptoms
6. Procedure index and page number in which the failing
FRU was detected
7. Failing FRU name and part number
8. Computer type, model number and serial number
9. Customer's name and address
Before checking problems with the computer, determine
whether or not the damage applies to the warranty by
referring to the following:
Note for Warranty: During the warranty period, the cus-
tomer may be responsible for repair costs if the computer
damage was caused by misuse, accident, modification,
unsuitable physical or operating environment, or improper
maintenance by the customer. The following list provides
some common items that are not covered under warranty
2ThinkPad 240

and some symptoms that may indicate that the system
was subjected to stresses beyond normal use:
The following is not covered under warranty:
LCD panel cracked by applying excessive force or
from being dropped
Scratched (cosmetic) parts
Cracked or broken plastic parts, broken latches,
broken pins, or broken connectors caused by exces-
sive force
Damage caused by liquid spilled into the system
Damage caused by the improper insertion of a PC
Card or the installation of an incompatible card
Damaged or bent PC Card eject button
Fuses blown by attachment of a non-supported
device
Forgotten computer password (making the computer
unusable)
The following symptoms might indicate damage caused by
non-warranted activities:
Missing parts might be a symptom of unauthorized
service or modification.
Hard disk drive spindles can become noisy from
being subjected to excessive force or from being
dropped.
How to Disable the Password
There are three passwords used at a typical customer site:
the Supervisor Password, the hard disk drive password,
and the Power On password.
Power On password:
1. Power off the computer.
2. Remove the battery pack and AC Adapter.
3. Open the keyboard and disconnect the keyboard
connector from the system board, see “1030
Keyboard” on page 28.
4. Short the jumper JP1. See the following figure:
ThinkPad 240 3

5. Close the keyboard.
6. Power on the computer and wait until POST
ends.
7. Verify that the password prompt does not
appear.
Supervisor and hard disk drive passwords:
The Supervisor Password and hard disk drive pass-
word are security features that are used to protect the
system and the hard disk drive data from unauthor-
ized access. No overriding capability is provided, so it
cannot be replaced if they are forgotten. If the cus-
tomer forgets the Supervisor Password, the system
board must be replaced. If the customer forgets the
hard disk drive password, the hard disk drive must be
replaced.
Product Overview
The following shows an overview of the system features of
the ThinkPad 240 computer.
Feature Description
Processor Intel** Celeron** processor
366 MHz, 128KB L2 cache
Bus architecture PCI Bus
Memory 64 MB SDRAM onboard only
32 MB, 64 MB or 128 MB DIMM
card (max. 192 MB)
BIOS ROM up to 512 Kbytes
Video 10.4–inch, 16M colors,
800x600 pixel TFT color LCD
4ThinkPad 240

Feature Description
Audio 16–bit audio
Internal speaker
Internal microphone
Hard disk drive 3.2/6.4GB, 2.5–inch, IDE
interface
I/O ports External monitor
Headphone/line-out
Line-in
Microphone-in
Mouse/keyboard
Parallel
Serial
USB
RJ11
External diskette drive
Infrared transfer IrDA 1.1
Internal modem 56Kbps (depends on the model)
PC Card (PCMCIA) One Type II
CardBus support
AC Adapter 56–Watt type
Fn Key Combinations
The following table shows the Fn key and function key
combinations and their corresponding functions.
The Fn key works independently of the operating system.
The operating system obtains the status through the
system management interface to control the system.
Fn + Result
F3 Standby mode
F4 Suspend mode
F5 Decrease brightness
F6 Increase brightness
F7 Switch between the LCD, the external monitor,
and both the LCD and external monitor.
F8 Switch power mode
F9 Hibernation mode
F10 Print screen
F11 Scroll lock
F12 Pause
0 (zero) Activates the system request function
-
(minus) Enables the numeric keypad
= Signals a break
ThinkPad 240 5

Fn + Result
Up
arrow Page up
Down
arrow Page down
Left
arrow Home
Right
arrow End
Insert Decreases the internal speaker volume
Delete Increases the internal speaker volume
Back-
space Mutes the internal speaker
Status Indicators
The system status LED indicators show the current com-
puter status. The following shows the location of each indi-
cator symbol and the meaning of each indicator.
ThinkPad
Symbol Color Meaning
(1) Battery status Green Enough battery power
remains for operation.
Blinking
orange The battery pack needs to be charged.
Orange The battery pack is being
charged.
(2) Suspend
mode Green The computer is in suspend mode.
Blinking
green The computer is entering suspend mode.
6ThinkPad 240

Symbol Color Meaning
(3) Drive in use Orange Data is being read from
or written to the hard
disk drive. Do not enter
hibernation mode or
power off the computer
when this indicator is on.
(4) Numeric lock Green The numeric keypad on
the keyboard is enabled.
You enable or disable
the keypad by pressing
and holding the Fn key,
and pressing the NumLk
key. For details, see the
User's Reference.
(5) Caps lock Green Caps Lock mode is
enabled. All alphabetic
characters (A-Z) are
entered in capital letters
without the Shift key
being pressed. You
enable or disable the
Caps Lock mode by
pressing and holding the
Fn key, and pressing the
Caps Lock key.
(6) Scroll lock Green Scroll Lock mode is
enabled. The Arrow
keys can be used as
screen-scroll function
keys. The cursor cannot
be moved with the
Arrow keys. Not all
application programs
support this function.
You enable or disable
Scroll Lock mode by
pressing and holding the
Fn key, and pressing the
ScrLk key.
(7) Power on Green The computer is opera-
tional. This indicator is
always on when the
computer is on and not
in suspend mode.
Checkout Guide
Use the following procedure as a guide for computer prob-
lems.
Note: The diagnostic tests are intended to test only IBM
products. Non-IBM products, prototype cards, or
modified options can give false errors and invalid
system responses.
ThinkPad 240 7

1. Obtain the failing symptoms in as much detail as pos-
sible.
2. Verify the symptoms by attempting to recreate the
failure by running the diagnostic test or by repeating
the same operation.
Note: To run the diagnostics, refer to “Running the
Diagnostics” on page 23
3. Use the following table with the verified symptom to
determine which page to go to. Search the symptoms
column and find the description that best matches
your symptom; then go to the page shown in the "Go
to" column.
Symptoms (Verified) Go to
Power failure. (The
power-on indicator does not
go on or stay on.)
“Power System Checkout”
on page 10, then use table
in “Power-Related
Symptoms” on page 20.
POST does not complete.
No beeps or error
codes/messages are indi-
cated.
“Symptom-to-FRU Index” on
page 16, then use table in
“No Beep Symptoms” on
page 19.
POST beeps, but no error
codes are displayed. “Symptom-to-FRU Index” on page 16.
POST detected an error and
displayed numeric error
codes.
“Symptom-to-FRU Index” on
page 16, then use table in
“Numeric Error Codes” on
page 16.
The diagnostic test detected
an error and displayed a
FRU code.
“Running the Diagnostics”
on page 23.
Other symptoms (such as
LCD display problems). “Symptom-to-FRU Index” on page 16.
Symptoms cannot be recre-
ated (intermittent problems). Use the customer-reported symptoms, and go to
“Symptom-to-FRU Index” on
page 16.
Audio Checkout
Do as follows:
1. Boot from the diagnostics diskette and start the
program.
2. Go to Interactive Tests on the main menu and select
the Internal Speaker test.
3. If no sound is heard, replace the speaker.
Fan ASM Checkout
To check the fan ASM, do the following:
1. Boot from the diagnostics diskette and start the
program.
8ThinkPad 240

2. Go to Diagnostics on the main menu and select
Other Devices.
3. Follow the description in the window. If the test
detects a fan ASM problem, replace the fan.
Keyboard and Auxiliary Input Device
Checkout
Note: Remove the external keyboard if the internal key-
board is to be tested.
If the internal keyboard does not work or an unexpected
character appears, make sure that the flexible cable
extending from the keyboard is correctly seated on the
connector.
If the keyboard cable connection is correct, run the Key-
board Test. See “Running the Diagnostics” on page 23 for
details.
If the test detects a keyboard problem, do the following
one at a time to correct the problem. Do not replace a non-
defective FRU.
1. Replace the keyboard.
2. Replace the system board.
The following auxiliary input devices are supported for this
computer:
Numeric keypad
Mouse (PS/2 compatible)
External keyboard (with keyboard/mouse cable)
If any of these devices do not work, reseat the cable con-
nector and repeat the failing operation.
If the problem does not reoccur, replace the device and
then the system board.
Memory Checkout
DIMM are available for increasing memory capacity.
Onboard (MB) Slot (MB) Total Memory
(MB)
32 0 32
32 32 64
32 64 96
32 128 160
64 0 64
64 32 96
64 64 128
64 128 192
ThinkPad 240 9

Memory errors might stop system operation, show error
messages on the screen, or hang the system.
Use the following procedure to isolate memory problems:
1. Turn off the computer and remove any installed DIMM
from its slot.
2. Boot from the diagnostics diskette and start the
program.
3. Go to Diagnostics on the main menu and select
Memory Test.If an error appears, replace the system
board.
4. Turn off the computer and reinstall the DIMM; then
turn on the computer. Verify the memory size; then
test the memory. If an error appears, replace the
DIMM.
Note: Make sure that the DIMM is properly installed into
the connector. A loose connection can cause an
error.
Modem Board Checkout
Do the following to isolate the problem to the system
internal modem:
1. Boot from the diagnostics diskette and start the
program.
2. Go to Diagnostics on the main menu and select
Other Devices.
3. Follow the description in the window.
4. If the test detects a modem problem, replace the
modem card.
Power System Checkout
To verify the symptom of the problem power on the com-
puter using each of the following power sources:
1. Remove the battery ASM.
2. Connect the AC Adapter and check that power is sup-
plied.
3. Disconnect the AC Adapter and install the charged
battery ASM; then check that power is supplied by the
battery ASM.
If you suspect a power problem, refer to the appropriate
power supply check listed below:
“Checking the AC Adapter” on page 11
“Checking the Operational Charging” on page 11
“Checking the Battery ASM” on page 11
10 ThinkPad 240

Checking the AC Adapter: You are here
because the computer fails only when the AC Adapter is
used:
If the power-on indicator does not turn on, check the
power cord of the AC Adapter for correct continuity
and installation.
If the operational charge does not work, go to
“Checking the Operational Charging.”
Unplug the AC Adapter cable from the computer and
measure the output voltage at the plug of the AC Adapter
cable. See the following figure.
If the voltage is not correct, replace the AC Adapter.
If the voltage is within the range, do the following:
Replace the system board.
If the problem is not corrected, go to “Undetermined
Problems” on page 22
Note: An audible noise from the AC Adapter does not
always indicate a defective adapter.
Checking the Operational Charging: To
check operational charging, use a discharged battery pack
(battery ASM) or a battery ASM that has less than 50% of
the total power remaining when installed in the computer.
Perform operational charging. If the battery status indicator
does not turn on, remove the battery ASM and let it return
to room temperature. Reinstall the battery ASM.
If the charge indicator still does not turn on, replace the
battery ASM. If the charge indicator still does not turn on,
replace the system board. Then reinstall the battery ASM.
If the reinstalled battery ASM is not charged, go to the next
section.
Checking the Battery ASM: Do the following:
1. Power off the computer.
2. Remove the battery ASM and measure the voltage
between battery terminals 1(+) and 5(-). See the fol-
lowing figure:
Pin Voltage (V dc)
1 +15.5 to +17.0
2 Ground
ThinkPad 240 11

Note: Signal lines, not used in these steps, are used
for communications between the system and
the battery.
3. If the voltage is less than 10.6V, the battery ASM has
been discharged, recharge the battery ASM. If the
voltage is still less than 10.6V, replace the battery.
TrackPoint Checkout
If the external mouse is connected, the TrackPoint does
not work. In this case, please detach the external mouse to
check the TrackPoint.
If this does not correct the TrackPoint problem, continue
with the following:
After you use the TrackPoint, the pointer drifts on the
screen for a short time. This self-acting pointer movement
can occur when a slight, steady pressure is applied to the
TrackPoint pointer. This symptom is not a hardware
problem. No service actions are necessary if the pointer
movement stops in a short period of time.
If a click button problem or pointing stick problem occurs,
do the following:
1. Boot from the diagnostics diskette and start the
program.
2. Go to Interactive Tests on the main menu and select
Mouse.
3. Follow the instructions in the message window.
If either the pointing stick or the click button does not work,
do the following actions one at a time to correct the
problem. Do not replace a non-defective FRU.
1. Reseat the keyboard Touchbutton cables.
2. Replace the keyboard.
3. Replace the system board.
12 ThinkPad 240

I/O Ports Checkout
Note: Be sure to enable the serial and parallel ports in
the BIOS setup utility before performing diagnostics
tests on the I/O ports.
Also, be sure to write down the I/O address for the
serial port to identify the port in the diagnostic test.
Do perform a diagnostics checkout on the I/O ports:
1. Boot from the diagnostics diskette and start the
program.
2. Go to Diagnostics on the main menu and select
Serial Ports or Parallel Ports.
Note: If you want to do a check on the infrared port,
select Serial Ports.
3. In the Serial Port Test Category, you can check four
items:
Registers and Interrupts
Internal Loopback
External Loopback
FIFO Buffers (16550A)
Move the cursor to the item you want to check, and
press Enter. Then follow the instructions on the
screen.
Note: To do an External Loopback test, you must
have a Loopback plug.
4. In the Parallel Port Test Category, you can check two
items:
Command And Data Port
External Loopback And IRQ
Move the cursor to the item you want to check, and
press Enter. Then follow the instructions on the
screen.
Note: To do an External Loopback And IRQ test,
you must have a Loopback plug.
Power Management Features
Three power management modes are available in the com-
puter system to reduce power consumption and to prolong
battery life.
Standby Mode: In standby mode, the following
occurs:
The LCD backlight turns off.
The hard disk drive motor stops.
Events that cause the computer to enter standby mode:
Standby mode requested by the Fn key (Fn+F3).
ThinkPad 240 13

The computer exits standby and resumes operation when
any key is pressed.
Suspend Mode: In suspend mode, the following
occurs:
The LCD is powered off.
The hard disk drive is powered off.
The CPU stops.
Events that cause the computer to enter suspend mode:
Suspend mode requested by the Fn key (Fn+F4).
The Lid is closed.
The specified time has elapsed.
Battery low occurs and hibernation conditions are
insufficient.
Note: When battery is low, the battery status indi-
cator blinks orange.
Note: In the IBM BIOS Setup Utility, the computer can be
set to suspend when the lid is closed.
The following events cause the computer to resume opera-
tion from suspend mode:
The Lid is opened.
The real time clock alarm is signaled.
The ring indicator (RI) is signaled by a PC Card
device or the internal modem.
The Fn key is pressed.
Power switch is pressed.
The computer also exits suspend mode when the battery is
critically low or timer conditions are satisfied for entering
hibernation mode.
Hibernation Mode: For Windows NT user:
A Windows NT user cannot create a hibernation file in a
Windows NT system that uses the NTFS format system. If
you want to use hibernation mode, you should reinstall
Windows NT with a FAT format system. Also, if boot
manager is installed, the computer cannot enter
hibernation mode.
Note: Before using hibernation mode, you need a
hibernation file.
In hibernation mode, the following occurs:
The system status, RAM, VRAM, and setup data are
stored on the hard disk.
The system is powered off.
Events that cause the computer to enter hibernation mode:
Hibernation mode requested by function key (Fn+F9).
14 ThinkPad 240

Timer conditions are satisfied in suspend mode when
hibernate by timer is enabled.
A critically low battery condition occurs.
The power switch is pressed. (BIOS Setup)
The computer exits hibernation mode and resumes opera-
tion when the power-on switch is pressed. When power is
turned on, the hibernation file in the boot record on the
hard disk drive is read and the system status is restored
from the hard disk drive.
The power switch must be pressed to cause the computer
to resume operation from hibernation mode.
How to Create the Hibernation Function: Do as
follows:
Turn off the computer.
Insert the hibernation utility diskette into the diskette
drive (you can create the diskette using the Diskette
Factory).
Turn on the computer.
Follow the instructions on the screen.
Note: If you change the memory size, you need to
recreate the hibernation file or partition. For
partition-based hibernation, use the hibernation
utility to delete the partition first before creating a
new one.
ThinkPad 240 15