IBM ThinkPad G41 Service Manual

ThinkPad Computer
Hardware

Maintenance Manual

July 2005

This manual supports:

ThinkPad G40, G41

Note

Before using this information and the product it
supports, be sure to read the general information
under “Notices” on page 156.

First Edition (July 2005)

© Copyright Lenovo 2005.
Portions © Copyright International Business Machines
Corporation 2005.
All rights reserved.

U.S. GOVERNMENT USERS – RESTRICTED RIGHTS:
Our products and/or services are provided with
RESTRICTED RIGHTS. Use, duplication or disclosure by
the Government is subject to the GSA ADP Schedule
contract with Lenovo Group Limited, if any, or the standard
terms of this commercial license, or if the agency is unable
to accept this Program under these terms, then we provide
this Program under the provisions set forth in Commercial
Computer Software–Restricted Rights at FAR 52.227-19,
when applicable, or under Rights in Data-General, FAR

52.227.14 (Alternate III).

Contents

About this manual . . . . . . . . . . .1

Introduction . . . . . . . . . . . . .3

Important service information . . . . . . . . .3

Strategy for replacing FRUs . . . . . . . .3

How to use error messages . . . . . . . .4

Diskette compatibility matrix . . . . . . . . .4

Safety notices: multilingual translations . . . . . .4

Safety information . . . . . . . . . . . .16

General safety . . . . . . . . . . . .16

Electrical safety . . . . . . . . . . .17

Safety inspection guide . . . . . . . . .19

Handling devices that are sensitive to electrostatic

discharge . . . . . . . . . . . .20

Grounding requirements . . . . . . . . .21

Laser compliance statement . . . . . . . . .21

General descriptions . . . . . . . . . .25

Read this first . . . . . . . . . . . . .25

What to do first . . . . . . . . . . .25

Related service information . . . . . . . . .28

Service Web site . . . . . . . . . . .28

Restoring the preloaded system . . . . . .28

Passwords . . . . . . . . . . . . .30

Power management . . . . . . . . . .33

Checkout guide . . . . . . . . . . . .35

Testing the computer . . . . . . . . . .35

Detecting system information with PC-Doctor . . .37

Power system checkout . . . . . . . . .38

ThinkPad G40, G41 . . . . . . . . . . .43

Product overview . . . . . . . . . . . .45

Specifications . . . . . . . . . . . .45

Status indicators . . . . . . . . . . .47

FRU tests . . . . . . . . . . . . .49

Fn key combinations . . . . . . . . . .51

Symptom-to-FRU index . . . . . . . . . .52

Numeric error codes . . . . . . . . . .52

Error messages . . . . . . . . . . .56

Beep symptoms . . . . . . . . . . .58

No-beep symptoms . . . . . . . . . .58

LCD-related symptoms . . . . . . . . .59

Intermittent problems . . . . . . . . . .60

Undetermined problems . . . . . . . . .60

FRU replacement notices . . . . . . . . .61

Screw notices . . . . . . . . . . . .61

Retaining serial numbers . . . . . . . . .62

Removing and replacing a FRU . . . . . . . .65

1010 Battery pack . . . . . . . . . . .66

1020 Hard disk drive . . . . . . . . . .67

© Lenovo 2005. Portions © IBM Corp. 2005. iii

1030 DIMM door . . . . . . . . . . .69

1040 DIMM . . . . . . . . . . . .70

1050 Modem daughter card (MDC) . . . . .71

1060 Backup battery . . . . . . . . . .72

1070 Keyboard . . . . . . . . . . .73

1080 Middle cover . . . . . . . . . .75

1090 Hinge cover . . . . . . . . . . .76

1095 FDD assembly . . . . . . . . . .77

1100 Blank bezel FDD assembly . . . . . .78

1110 VGA heatsink assembly . . . . . . .79

1120 VGA card assembly . . . . . . . .80

1130 CD-ROM/DVD drive and ODD bracket . . .81

1140 Mini PCI adapter . . . . . . . . .82

1150 PC card slot assembly . . . . . . . .83

1160 LCD and Keyboard bezel assembly . . . .86

1170 LCD assembly . . . . . . . . . .89

1180 Keyboard bezel . . . . . . . . . .92

1190 Fan assembly . . . . . . . . . .94

2000 Fan (CPU 3 GHz) and CPU fixture . . . .96

2010 CPU . . . . . . . . . . . . .98

2020 CD-ROM/DVD drive bracket . . . . . .99

2030 FDD bracket . . . . . . . . . . 100

2040 System board . . . . . . . . . . 101

2050 Lower case assembly . . . . . . . 102

2060 Modem cable . . . . . . . . . . 103

2070 PC card slot assembly . . . . . . . 104

2080 LCD front bezel . . . . . . . . . 105

2090 Inverter card . . . . . . . . . . 106

3000 Speaker assembly . . . . . . . . 107

3010 LCD cable assembly . . . . . . . . 108

3020 Wireless antenna and rear cover . . . .110

3030 LCD panel and hinge assembly . . . . . 111

Locations . . . . . . . . . . . . . .112

Front view . . . . . . . . . . . . .112

Rear view . . . . . . . . . . . . .113

Bottom view . . . . . . . . . . . .114

Parts list . . . . . . . . . . . . . .115

G40, G41 series . . . . . . . . . . .115

Overall . . . . . . . . . . . . . 139

LCD FRUs . . . . . . . . . . . . 146

Keyboard . . . . . . . . . . . . . 149

Recovery CDs . . . . . . . . . . . 150

Miscellaneous parts . . . . . . . . . . 153

AC adapters . . . . . . . . . . . . 153

Telephone cable . . . . . . . . . . . 153

Optional FRUs . . . . . . . . . . . 154

Common parts list . . . . . . . . . . 154

Notices . . . . . . . . . . . . . . 156

Trademarks . . . . . . . . . . . . . 158

iv ThinkPad G40, G41

About this manual

This manual contains service and reference information for
ThinkPad G40 and G41 products. Use this manual along
with the advanced diagnostic tests to troubleshoot
problems.

The manual is divided into sections as follows:

v The common sections provide general information,

guidelines, and safety information required in servicing
computers.

v The product-specific section includes service, reference,

and product-specific parts information.

Important

This manual is intended for trained service
personnel who are familiar with ThinkPad products.
Use this manual along with the advanced diagnostic
tests to troubleshoot problems effectively.

Before servicing ThinkPad products, be sure to
review the safety information under “Safety notices:
multilingual translations” on page 4, “Safety
information” on page 16, and “Laser compliance
statement” on page 21.

© Lenovo 2005. Portions © IBM Corp. 2005. 1

2 ThinkPad G40, G41

Introduction

Important service information

Important

BIOS and device driver fixes are
customer-installable. The BIOS and device drivers
are posted on the customer support site

http://www.lenovo.com/think/support

Advise customers to contact the Customer Support
Center at 800-426-7378 if they need assistance in
obtaining or installing any diskette fixes.

Customers in Canada should call the Customer
Support Center at 800-565-3344 for assistance or
download information.

Strategy for replacing FRUs

Before replacing parts

Make sure that all software fixes are installed before
replacing any FRUs listed in this manual.

Use the following strategy to prevent unnecessary expense

for replacing and servicing FRUs:

v If you are instructed to replace a FRU but the

replacement does not correct the problem, reinstall
the original FRU before you continue.

v Some computers have both a processor board and a

system board. If you are instructed to replace either the
processor board or the system board, and replacing one
of them does not correct the problem, reinstall that
board, and then replace the other one.

v If an adapter or device consists of more than one FRU,

any of the FRUs may be the cause of the error. Before
replacing the adapter or device, remove the FRUs, one
by one, to see if the symptoms change. Replace only
the FRU that changed the symptoms.

Attention: The setup configuration on the computer you

are servicing may have been customized. Loading Setup
Defaults or replacing the system board may alter the
settings. Note the current configuration settings (using the
BIOS Setup Utility); then, when service has been
completed, verify that those settings remain in effect.

© Lenovo 2005. Portions © IBM Corp. 2005. 3

Important service information

Strategy for replacing a hard disk drive

Always try to run a low-level format before replacing a hard
disk drive.

Attention: The drive startup sequence in the computer

you are servicing may have been changed. Be extremely
careful during write operations such as copying, saving, or
formatting. If you select an incorrect drive, data or
programs can be overwritten.

How to use error messages

Use the error codes displayed on the screen to diagnose
failures. If more than one error code is displayed, begin the
diagnosis with the first error code. Whatever causes the
first error code may also cause false error codes. If no
error code is displayed, see if the error symptom is listed
in the Symptom-to-FRU Index for the computer you are
servicing.

Diskette compatibility matrix

The compatibility of each of the drives with the diskettes
for it is as follows:

Diskette
drive

3.5-inch 1.0 MB Read and write

Diskette
capacity

2.0 MB Read and write

4.0 MB Not compatible

Compatibility

Safety notices: multilingual translations

In this manual, safety notices appear in English with a
page number reference to the appropriate multilingual,
translated safety notice found in this section.

The following safety notices are provided in English,
French, German, Hebrew, Italian, and Spanish.

4 ThinkPad G40, G41

Safety notices

Safety notice 1

Before the computer is powered on after FRU

replacement, make sure all screws, springs, and other

small parts are in place and are not left loose inside

the computer. Verify this by shaking the computer and

listening for rattling sounds. Metallic parts or metal

flakes can cause electrical shorts.

Avant de remettre l’ordinateur sous tension après

remplacement d’une unité en clientèle, vérifiez que

tous les ressorts, vis et autres pièces sont bien en

place et bien fixées. Pour ce faire, secouez l’unité et

assurez-vous qu’aucun bruit suspect ne se produit. Des

pièces métalliques ou des copeaux de métal pourraient

causer un court-circuit.

Bevor nach einem FRU-Austausch der Computer

wieder angeschlossen wird, muß sichergestellt werden,

daß keine Schrauben, Federn oder andere Kleinteile

fehlen oder im Gehäuse vergessen wurden. Der

Computer muß geschüttelt und auf Klappergeräusche

geprüft werden. Metallteile oder-splitter können

Kurzschlüsse erzeugen.

Prima di accendere l’elaboratore dopo che é stata

effettuata la sostituzione di una FRU, accertarsi che

tutte le viti, le molle e tutte le altri parti di piccole

dimensioni siano nella corretta posizione e non siano

sparse all’interno dell’elaboratore. Verificare ciò

scuotendo l’elaboratore e prestando attenzione ad

eventuali rumori; eventuali parti o pezzetti metallici

possono provocare cortocircuiti pericolosi.

Antes de encender el sistema despues de sustituir una

FRU, compruebe que todos los tornillos, muelles y

demás piezas pequeñas se encuentran en su sitio y no

se encuentran sueltas dentro del sistema.

Compruébelo agitando el sistema y escuchando los

posibles ruidos que provocarían. Las piezas metálicas

pueden causar cortocircuitos eléctricos.

Introduction 5

Safety notices

Safety notice 2

DANGER

Some standby batteries contain a small amount of
nickel and cadmium. Do not disassemble a standby
battery, recharge it, throw it into fire or water, or
short-circuit it. Dispose of the battery as required
by local ordinances or regulations. Use only the
battery in the appropriate parts listing. Use of an
incorrect battery can result in ignition or explosion
of the battery.

Certaines batteries de secours contiennent du
nickel et du cadmium. Ne les démontez pas, ne les
rechargez pas, ne les exposez ni au feu ni à l’eau.
Ne les mettez pas en court-circuit. Pour les mettre
au rebut, conformez-vous à la réglementation en
vigueur. Lorsque vous remplacez la pile de
sauvegarde ou celle de l’horloge temps réel, veillez
à n’utiliser que les modèles cités dans la liste de
pièces détachées adéquate. Une batterie ou une
pile inappropriée risque de prendre feu ou
d’exploser.

Die Bereitschaftsbatterie, die sich unter dem
Diskettenlaufwerk befindet, kann geringe Mengen
Nickel und Cadmium enthalten. Sie darf nur durch
die Verkaufsstelle oder den IBM Kundendienst
ausgetauscht werden. Sie darf nicht zerlegt,
wiederaufgeladen, kurzgeschlossen, oder Feuer
oder Wasser ausgesetzt werden. Die Batterie kann
schwere Verbrennungen oder Verätzungen
verursachen. Bei der Entsorgung die örtlichen
Bestimmungen für Sondermüll beachten. Beim
Ersetzen der Bereitschafts-oder Systembatterie nur
Batterien des Typs verwenden, der in der
Ersatzteilliste aufgeführt ist. Der Einsatz falscher
Batterien kann zu Entzündung oder Explosion
führen.

(continued)

6 ThinkPad G40, G41

Safety notices

(continuation of safety notice 2)

Alcune batterie di riserva contengono una piccola

quantità di nichel e cadmio. Non smontarle,

ricaricarle, gettarle nel fuoco o nell’acqua né

cortocircuitarle. Smaltirle secondo la normativa in

vigore (DPR 915/82, successive disposizioni e

disposizioni locali). Quando si sostituisce la

batteria dell’RTC (real time clock) o la batteria di

supporto, utilizzare soltanto i tipi inseriti

nell’appropriato Catalogo parti. L’impiego di una

batteria non adatta potrebbe determinare l’incendio

o l’esplosione della batteria stessa.

Algunas baterías de reserva contienen una

pequeña cantidad de níquel y cadmio. No las

desmonte, ni recargue, ni las eche al fuego o al

agua ni las cortocircuite. Deséchelas tal como

dispone la normativa local. Utilice sólo baterías que

se encuentren en la lista de piezas. La utilización

de una batería no apropiada puede provocar la

ignición o explosión de la misma.

Introduction 7

Safety notices

Safety notice 3

DANGER

The battery pack contains small amounts of nickel.
Do not disassemble it, throw it into fire or water, or
short-circuit it. Dispose of the battery pack as
required by local ordinances or regulations. Use
only the battery in the appropriate parts listing
when replacing the battery pack. Use of an
incorrect battery can result in ignition or explosion
of the battery.

La batterie contient du nickel. Ne la démontez pas,
ne l’exposez ni au feu ni à l’eau. Ne la mettez pas
en court-circuit. Pour la mettre au rebut,
conformez-vous à la réglementation en vigueur.
Lorsque vous remplacez la batterie, veillez à
n’utiliser que les modèles cités dans la liste de
pièces détachées adéquate. En effet, une batterie
inappropriée risque de prendre feu ou d’exploser.

Akkus enthalten geringe Mengen von Nickel. Sie
dürfen nicht zerlegt, wiederaufgeladen,
kurzgeschlossen, oder Feuer oder Wasser
ausgesetzt werden. Bei der Entsorgung die
örtlichen Bestimmungen für Sondermüll beachten.
Beim Ersetzen der Batterie nur Batterien des Typs
verwenden, der in der Ersatzteilliste aufgeführt ist.
Der Einsatz falscher Batterien kann zu Entzündung
oder Explosion führen.

(continued)

8 ThinkPad G40, G41

Safety notices

(continuation of safety notice 3)

La batteria contiene piccole quantità di nichel. Non

smontarla, gettarla nel fuoco o nell’acqua né

cortocircuitarla. Smaltirla secondo la normativa in

vigore (DPR 915/82, successive disposizioni e

disposizioni locali). Quando si sostituisce la

batteria, utilizzare soltanto i tipi inseriti

nell’appropriato Catalogo parti. L’impiego di una

batteria non adatta potrebbe determinare l’incendio

o l’esplosione della batteria stessa.

Las baterías contienen pequeñas cantidades de

níquel. No las desmonte, ni recargue, ni las eche al

fuego o al agua ni las cortocircuite. Deséchelas tal

como dispone la normativa local. Utilice sólo

baterías que se encuentren en la lista de piezas al

sustituir la batería. La utilización de una batería no

apropiada puede provocar la ignición o explosión

de la misma.

Introduction 9

Safety notices

Safety notice 4

DANGER

The lithium battery can cause a fire, an explosion,
or a severe burn. Do not recharge it, remove its
polarized connector, disassemble it, heat it above
100°C (212°F), incinerate it, or expose its cell
contents to water. Dispose of the battery as
required by local ordinances or regulations. Use
only the battery in the appropriate parts listing. Use
of an incorrect battery can result in ignition or
explosion of the battery.

La pile de sauvegarde contient du lithium. Elle
présente des risques d’incendie, d’explosion ou de
brûlures graves. Ne la rechargez pas, ne retirez pas
son connecteur polarisé et ne la démontez pas. Ne
l’exposez pas à une temperature supérieure à
100°C, ne la faites pas brûler et n’en exposez pas
le contenu à l’eau. Mettez la pile au rebut
conformément à la réglementation en vigueur. Une
pile inappropriée risque de prendre feu ou
d’exploser.

Die Systembatterie ist eine Lithiumbatterie. Sie
kann sich entzünden, explodieren oder schwere
Verbrennungen hervorrufen. Batterien dieses Typs
dürfen nicht aufgeladen, zerlegt, über 100 C erhitzt
oder verbrannt werden. Auch darf ihr Inhalt nicht
mit Wasser in Verbindung gebracht oder der zur
richtigen Polung angebrachte Verbindungsstecker
entfernt werden. Bei der Entsorgung die örtlichen
Bestimmungen für Sondermüll beachten. Beim
Ersetzen der Batterie nur Batterien des Typs
verwenden, der in der Ersatzteilliste aufgeführt ist.
Der Einsatz falscher Batterien kann zu Entzündung
oder Explosion führen.

(continued)

10 ThinkPad G40, G41

Safety notices

(continuation of safety notice 4)

La batteria di supporto e una batteria al litio e puo

incendiarsi, esplodere o procurare gravi ustioni.

Evitare di ricaricarla, smontarne il connettore

polarizzato, smontarla, riscaldarla ad una

temperatura superiore ai 100 gradi centigradi,

incendiarla o gettarla in acqua. Smaltirla secondo

la normativa in vigore (DPR 915/82, successive

disposizioni e disposizioni locali). L’impiego di una

batteria non adatta potrebbe determinare l’incendio

o l’esplosione della batteria stessa.

La batería de repuesto es una batería de litio y

puede provocar incendios, explosiones o

quemaduras graves. No la recargue, ni quite el

conector polarizado, ni la desmonte, ni caliente por

encima de los 100°C (212°F), ni la incinere ni

exponga el contenido de sus celdas al agua.

Deséchela tal como dispone la normativa local.

Introduction 11

Safety notices

Safety notice 5

If the LCD breaks and the fluid from inside the LCD
gets into your eyes or on your hands, immediately
wash the affected areas with water for at least 15
minutes. Seek medical care if any symptoms from the
fluid are present after washing.

Si le panneau d’affichage à cristaux liquides se brise et
que vous recevez dans les yeux ou sur les mains une
partie du fluide, rincez-les abondamment pendant au
moins quinze minutes. Consultez un médecin si des
symptômes persistent après le lavage.

Die Leuchtstoffröhre im LCD-Bildschirm enthält
Quecksilber. Bei der Entsorgung die örtlichen
Bestimmungen für Sondermüll beachten. Der
LCD-Bildschirm besteht aus Glas und kann zerbrechen,
wenn er unsachgemäß behandelt wird oder der
Computer auf den Boden fällt. Wenn der Bildschirm
beschädigt ist und die darin befindliche Flüssigkeit in
Kontakt mit Haut und Augen gerät, sollten die
betroffenen Stellen mindestens 15 Minuten mit Wasser
abgespült und bei Beschwerden anschließend ein Arzt
aufgesucht werden.

Nel caso che caso l’LCD si dovesse rompere ed il
liquido in esso contenuto entrasse in contatto con gli
occhi o le mani, lavare immediatamente le parti
interessate con acqua corrente per almeno 15 minuti;
poi consultare un medico se i sintomi dovessero
permanere.

Si la LCD se rompe y el fluido de su interior entra en
contacto con sus ojos o sus manos, lave
inmediatamente las áreas afectadas con agua durante
15 minutos como mínimo. Obtenga atención medica si
se presenta algún síntoma del fluido despues de
lavarse.

12 ThinkPad G40, G41

Safety notices

Safety notice 6

DANGER

To avoid shock, do not remove the plastic cover

that protects the lower part of the inverter card.

Afin d’éviter tout risque de choc électrique, ne

retirez pas le cache en plastique protégeant la

partie inférieure de la carte d’alimentation.

Aus Sicherheitsgründen die Kunststoffabdeckung,

die den unteren Teil der Spannungswandlerplatine

umgibt, nicht entfernen.

Per evitare scosse elettriche, non rimuovere la

copertura in plastica che avvolge la parte inferiore

della scheda invertitore.

Para evitar descargas, no quite la cubierta de

plástico que rodea la parte baja de la tarjeta

invertida.

Introduction 13

Safety notices

Safety notice 7

DANGER

Though the main batteries have low voltage, a
shorted or grounded battery can produce enough
current to burn personnel or combustible materials.

Bien que le voltage des batteries principales soit
peu élevé, le court-circuit ou la mise à la masse
d’une batterie peut produire suffisamment de
courant pour brûler des matériaux combustibles ou
causer des brûlures corporelles graves.

Obwohl Hauptbatterien eine niedrige Spannung
haben, können sie doch bei Kurzschluß oder
Erdung genug Strom abgeben, um brennbare
Materialien zu entzünden oder Verletzungen bei
Personen hervorzurufen.

Sebbene le batterie di alimentazione siano a basso
voltaggio, una batteria in corto circuito o a massa
può fornire corrente sufficiente da bruciare
materiali combustibili o provocare ustioni ai tecnici
di manutenzione.

Aunque las baterías principales tienen un voltaje
bajo, una batería cortocircuitada o con contacto a
tierra puede producir la corriente suficiente como
para quemar material combustible o provocar
quemaduras en el personal.

14 ThinkPad G40, G41

Safety notices

Safety notice 8

DANGER

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.

Avant de retirer une unité remplaçable en clientèle,

mettez le système hors tension, débranchez tous

les cordons d’alimentation des socles de prise de

courant, retirez la batterie et déconnectez tous les

cordons d’interface.

Die Stromzufuhr muß abgeschaltet, alle Stromkabel

aus der Steckdose gezogen, der Akku entfernt und

alle Verbindungskabel abgenommen sein, bevor

eine FRU entfernt wird.

Prima di rimuovere qualsiasi FRU, spegnere il

sistema, scollegare dalle prese elettriche tutti i cavi

di alimentazione, rimuovere la batteria e poi

scollegare i cavi di interconnessione.

Antes de quitar una FRU, apague el sistema,

desenchufe todos los cables de las tomas de

corriente eléctrica, quite la batería y, a

continuación, desconecte cualquier cable de

conexión entre dispositivos.

Introduction 15

Safety information

Safety information

The following section presents safety information with
which you need to be familiar before you service a
ThinkPad computer.

General safety

Follow these rules to ensure general safety:

v Observe good housekeeping in the area of the

machines during and after maintenance.

v When lifting any heavy object:

1. Ensure you can stand safely without slipping.

2. Distribute the weight of the object equally between
your feet.

3. Use a slow lifting force. Never move suddenly or
twist when you attempt to lift.

4. Lift by standing or by pushing up with your leg
muscles; this action removes the strain from the
muscles in your back. Do not attempt to lift any

object that weighs more than 16 kg (35 lb) or objects
that you think are too heavy for you.

Do not perform any action that causes hazards to the

v

customer, or that makes the equipment unsafe.

v Before you start the machine, ensure that other service

representatives and the customer’s personnel are not in
a hazardous position.

v Place removed covers and other parts in a safe place,

away from all personnel, while you are servicing the
machine.

v Keep your toolcase away from walk areas so that other

people will not trip over it.

v Do not wear loose clothing that can be trapped in the

moving parts of a machine. Make sure that your sleeves
are fastened or rolled up above your elbows. If your hair
is long, fasten it.

v Insert the ends of your necktie or scarf inside clothing or

fasten it with a nonconductive clip, approximately 8
centimeters (3 inches) from the end.

v Do not wear jewelry, chains, metal-frame eyeglasses, or

metal fasteners for your clothing.

Attention: Metal objects are good electrical

conductors.

v Wear safety glasses when you are hammering, drilling,

soldering, cutting wire, attaching springs, using solvents,
or working in any other conditions that might be
hazardous to your eyes.

16 ThinkPad G40, G41

Safety information

v After service, reinstall all safety shields, guards, labels,

and ground wires. Replace any safety device that is
worn or defective.

v Reinstall all covers correctly before returning the

machine to the customer.

v Fan louvers on the machine help to prevent overheating

of internal components. Do not obstruct fan louvers or
cover them with labels or stickers.

Warning

Handling the cord on this product or cords
associated with accessories sold with this product
will expose you to lead, a chemical known to the
state of California to cause cancer, and birth defects
or other reproductive harm. Wash hands after

handling.

Electrical safety

Observe the following rules when working on electrical
equipment.

Important

Use only approved tools and test equipment. Some
hand tools have handles covered with a soft
material that does not insulate you when working
with live electrical currents.

Many customers have, near their equipment, rubber
floor mats that contain small conductive fibers to
decrease electrostatic discharges. Do not use this
type of mat to protect yourself from electrical shock.

v Find the room emergency power-off (EPO) switch,

disconnecting switch, or electrical outlet. If an electrical
accident occurs, you can then operate the switch or
unplug the power cord quickly.

v Do not work alone under hazardous conditions or near

equipment that has hazardous voltages.

v Disconnect all power before:

– Performing a mechanical inspection
– Working near power supplies
– Removing or installing main units

Before you start to work on the machine, unplug the

v

power cord. If you cannot unplug it, ask the customer to
power-off the wall box that supplies power to the
machine and to lock the wall box in the off position.

v If you need to work on a machine that has exposed

electrical circuits, observe the following precautions:

Introduction 17

Safety information

– Ensure that another person, familiar with the

power-off controls, is near you.

Attention: Another person must be there to switch

off the power, if necessary.

– Use only one hand when working with powered-on

electrical equipment; keep the other hand in your
pocket or behind your back.

Attention: An electrical shock can occur only when

there is a complete circuit. By observing the above
rule, you may prevent a current from passing through
your body.

– When using testers, set the controls correctly and

use the approved probe leads and accessories for
that tester.

– Stand on suitable rubber mats (obtained locally, if

necessary) to insulate you from grounds such as
metal floor strips and machine frames.

Observe the special safety precautions when you work
with very high voltages; these instructions are in the
safety sections of maintenance information. Use
extreme care when measuring high voltages.

v Regularly inspect and maintain your electrical hand tools

for safe operational condition.

v Do not use worn or broken tools and testers.

v Never assume that power has been disconnected from

a circuit. First, check that it has been powered off.

v Always look carefully for possible hazards in your work

area. Examples of these hazards are moist floors,
nongrounded power extension cables, power surges,
and missing safety grounds.

v Do not touch live electrical circuits with the reflective

surface of a plastic dental mirror. The surface is
conductive; such touching can cause personal injury and
machine damage.

v Do not service the following parts with the power on

when they are removed from their normal operating
places in a machine:
– Power supply units
– Pumps
– Blowers and fans
– Motor generators

similar units. (This practice ensures correct

and
grounding of the units.)

v If an electrical accident occurs:

– Use caution; do not become a victim yourself.
– Switch off power.
– Send another person to get medical aid.

18 ThinkPad G40, G41

Safety information

Safety inspection guide

The purpose of this inspection guide is to assist you in
identifying potentially unsafe conditions. As each machine
was designed and built, required safety items were
installed to protect users and service personnel from injury.
This guide addresses only those items. You should use
good judgment to identify potential safety hazards due to
attachment of non-ThinkPad features or options not
covered by this inspection guide.

If any unsafe conditions are present, you must determine
how serious the apparent hazard could be and whether
you can continue without first correcting the problem.

Consider these conditions and the safety hazards they
present:

v Electrical hazards, especially primary power (primary

voltage on the frame can cause serious or fatal
electrical shock)

v Explosive hazards, such as a damaged CRT face or a

bulging capacitor

v Mechanical hazards, such as loose or missing hardware

determine whether there are any potentially unsafe

To
conditions, use the following checklist at the beginning of
every service task. Begin the checks with the power off,
and the power cord disconnected.

Checklist:

1. Check exterior covers for damage (loose, broken, or
sharp edges).

2. Power-off the computer. Disconnect the power cord.

3. Check the power cord for:

a. A third-wire ground connector in good condition.

Use a meter to measure third-wire ground
continuity for 0.1 ohm or less between the external
ground pin and frame ground.

b. The power cord should be the type specified in the

parts list.

c. Insulation must not be frayed or worn.

Remove the cover.

4.

5. Check for any obvious non-ThinkPad alterations. Use
good judgment as to the safety of any non-ThinkPad
alterations.

6. Check inside the unit for any obvious unsafe
conditions, such as metal filings, contamination, water
or other liquids, or signs of fire or smoke damage.

7. Check for worn, frayed, or pinched cables.

Introduction 19

Safety information

8. Check that the power-supply cover fasteners (screws
or rivets) have not been removed or tampered with.

Handling devices that are sensitive to electrostatic discharge

Any computer part containing transistors or integrated
circuits (ICs) should be considered sensitive to electrostatic
discharge (ESD.) ESD damage can occur when there is a
difference in charge between objects. Protect against ESD
damage by equalizing the charge so that the machine, the
part, the work mat, and the person handling the part are all
at the same charge.

Notes

1. Use product-specific ESD procedures when they
exceed the requirements noted here.

2. Make sure that the ESD protective devices you
use have been certified (ISO 9000) as fully
effective.

When handling ESD-sensitive parts:

v Keep the parts in protective packages until they are

inserted into the product.

v Avoid contact with other people.

v Wear a grounded wrist strap against your skin to

eliminate static on your body.

v Prevent the part from touching your clothing. Most

clothing is insulative and retains a charge even when
you are wearing a wrist strap.

v Use the black side of a grounded work mat to provide a

static-free work surface. The mat is especially useful
when handling ESD-sensitive devices.

v Select a grounding system, such as those listed below,

to provide protection that meets the specific service
requirement.

Note

The use of a grounding system is desirable but
not required to protect against ESD damage.

– Attach the ESD ground clip to any frame ground,

ground braid, or green-wire ground.

– Use an ESD common ground or reference point

when working on a double-insulated or
battery-operated system. You can use coax or
connector-outside shells on these systems.

20 ThinkPad G40, G41

Safety information

– Use the round ground-prong of the AC plug on

AC-operated computers.

Grounding requirements

Electrical grounding of the computer is required for
operator safety and correct system function. Proper
grounding of the electrical outlet can be verified by a
certified electrician.

Laser compliance statement

Some models of ThinkPad computer are equipped from
the factory with an optical storage device such as a
CD-ROM drive or a DVD-ROM drive. Such devices are
also sold separately as options. If one of these drives is
installed, it is certified in the U.S. to conform to the
requirements of the Department of Health and Human
Services 21 Code of Federal Regulations (DHHS 21 CFR)
Subchapter J for Class 1 laser products. Elsewhere, the
drive is certified to conform to the requirements of the
International Electrotechnical Commission (IEC) 825 and
CENELEC EN 60 825 for Class 1 laser products.

Introduction 21

Laser compliance statement

If a CD-ROM drive, a DVD-ROM drive, or another laser
device is installed, note the following:

CAUTION:

Use of controls or adjustments or performance of
procedures other than those specified herein might
result in hazardous radiation exposure.

O uso de controles, ajustes ou desempenho de
procedimentos diferentes daqueles aqui
especificados pode resultar em perigosa exposição
à radiação.

Pour éviter tout risque d’exposition au rayon laser,
respectez les consignes de réglage et d’utilisation
des commandes, ainsi que les procédures décrites.

Werden Steuer- und Einstellelemente anders als
hier festgesetzt verwendet, kann gefährliche
Laserstrahlung auftreten.

L’utilizzo di controlli, regolazioni o l’esecuzione di
procedure diverse da quelle specificate possono
provocare l’esposizione a.

El uso de controles o ajustes o la ejecución de
procedimientos distintos de los aquí especificados
puede provocar la exposición a radiaciones
peligrosas.

Opening the CD-ROM drive, the DVD-ROM drive, or any
other optical storage device could result in exposure to
hazardous laser radiation. There are no serviceable parts
inside those drives. Do not open.

22 ThinkPad G40, G41

Laser compliance statement

A CD-ROM drive, a DVD-ROM drive, or any other storage
device installed may contain an embedded Class 3A or
Class 3B laser diode. Note the following:

DANGER

Emits visible and invisible laser radiation when
open. Do not stare into the beam, do not view
directly with optical instruments, and avoid direct
exposure to the beam.

Radiação por raio laser ao abrir. Não olhe fixo no
feixe de luz, não olhe diretamente por meio de
instrumentos óticos e evite exposição direta com o
feixe de luz.

Rayonnement laser si carter ouvert. Évitez de fixer
le faisceau, de le regarder directement avec des
instruments optiques, ou de vous exposer au
rayon.

Laserstrahlung bei geöffnetem Gerät. Nicht direkt
oder über optische Instrumente in den Laserstrahl
sehen und den Strahlungsbereich meiden.

Kinyitáskor lézersugár ! Ne nézzen bele se szabad
szemmel, se optikai eszközökkel. Kerülje a
sugárnyalábbal való érintkezést !.

Aprendo l’unità vengono emesse radiazioni laser.
Non fissare il fascio, non guardarlo direttamente
con strumenti ottici e evitare l’esposizione diretta al
fascio.

Radiación láser al abrir. No mire fijamente ni
examine con instrumental óptico el haz de luz.
Evite la exposición directa al haz.

Introduction 23

Laser compliance statement

24 ThinkPad G40, G41

General descriptions

The desciptions in this chapter apply to any ThinkPad
model that has the PC-Doctor

®

for DOS diagnostics
program. Some descriptions might not apply to your
particular computer.

Read this first

Before you go to the checkout guide, be sure to read this
section.

Important notes

v Only certified trained personnel should

service the computer.

v Read the entire FRU removal and replacement

page before replacing any FRU.

v Use new nylon-coated screws when you

replace FRUs.

v Be extremely careful during write operations

such as copying, saving, or formatting. The

drive startup sequence in the computer you are
servicing might have been changed. If you select
an incorrect drive, data or programs might be
overwritten.

v Replace FRUs only for the correct model.

When you replace a FRU, make sure the model
of the machine and the FRU part number are
correct by referring to the FRU parts list.

v 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. Consider replacing a FRU only
when a problem recurs. If you suspect that a
FRU is defective, clear the error log and run the
test again. If the error does not recur, do not
replace the FRU.

v Be careful not to replace a nondefective FRU.

What to do first

When you do return a FRU, you must include the following
information in the parts exchange form or parts return form
that you attach to it:
__ 1. Name and phone number of servicer
__ 2. Date of service

© Lenovo 2005. Portions © IBM Corp. 2005. 25

Read this first

__ 3. Date on which the machine 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. Machine type, model number, and serial number
__ 9. Customer’s name and address

Note for warranty:

the warranty period, the customer may be

During
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
and some symptoms that might indicate that the system
was subjected to stress beyond normal use.

Before checking problems with the computer, determine
whether the damage is covered under the warranty by
referring to the following:

The following are not covered under warranty:

v LCD panel cracked from the application of excessive

force or from being dropped

v Scratched (cosmetic) parts

v Distortion, deformation, or discoloration of the cosmetic

parts

v Cracked or broken plastic parts, broken latches, broken

pins, or broken connectors caused by excessive force

v Damage caused by liquid spilled into the system

v Damage caused by the improper insertion of a PC Card

or the installation of an incompatible card

v Damage caused by foreign material in the diskette drive

v Diskette drive damage caused by pressure on the

diskette drive cover or by the insertion of a diskette with
multiple labels

v Damaged or bent diskette eject button

v Fuses blown by attachment of a nonsupported device

v Forgotten computer password (making the computer

unusable)

v Sticky keys caused by spilling a liquid onto the keyboard

The following symptoms might indicate damage
caused by nonwarranted activities:

v Missing parts might be a symptom of unauthorized

service or modification.

26 ThinkPad G40, G41

Read this first

v If the spindle of a hard disk drive becomes noisy, it may

have been subjected to excessive force, or dropped.

General descriptions 27

Related service information

Related service information

This section provides information about the following:

v “Service Web site”
v “Restoring the preloaded system”
v “Passwords” on page 30
v “Power management” on page 33

Service Web site

When the latest maintenance diskette and the system
program service diskette become available, they will be
posted on http://www.lenovo.com/think/spm

Restoring the preloaded system

If the data on a hard disk drive is damaged or accidentally
erased, you can restore the software that was shipped with
the computer. This software includes the pre-installed
operating system, applications, and device drivers.

To restore the pre-installed software, you can use either
the Product Recovery program or a recovery CD.

Ordering the recovery CD

When the hard disk drive is replaced because of a
failure, no Product Recovery program is on the new
hard disk. In this case, you must use the Product
Recovery CD for the computer. Order the recovery
CD and the hard disk drive at the same time so that
you can recover the new hard disk drive with the
pre-installed software when they arrive. For
information on which CD to order, and the latest
procedure on how to do so, see “Recovery CDs” on
page 150.

The Product Recovery program is in the Predesktop Area,

a section of the hard disk drive that is not displayed by
Windows Explorer.

Note: The recovery process might take up to 2 hours.

Attention: All of the files on the primary hard disk

partition (usually drive C) will be lost in the recovery
process. Be sure to back up copies of the files you have
saved on your drive C before you begin.

To use the Product Recovery program to install your
pre-installed software, do the following:

1. If possible, save all your files to media other than your

hard disk.

2. Turn off your computer.

28 ThinkPad G40, G41

Related service information

3. Turn on your computer. At the prompt, press the
Access IBM button. (The prompt “To interrupt normal
startup, press the blue Access IBM button” appears for
only a few seconds. You must press the Access IBM
button quickly.) The Predesktop Area appears on the
screen. Next, double-click the “Recover to factory
contents” icon. The Product Recovery program main
menu opens.

4. Select the recovery options you want, and then follow
the instructions on the screeen.

5. When the Product Recovery program finishes, your
computer will restart and begin the configuration
process.

Using the recovery CD

You can delete the Predesktop Area partition by going into
the BIOS Setup Utility (F1 at IBM Splash Screen), and
then choosing Security -> IBM Predesktop Area -->
Disabled. This will make the Predesktop Area available to
FDISK. If you choose Disabled, the following warning
appears:

Attention! If you select Disabled, the IBM Predesktop Area
will be visible and can be reclaimed by the OS. Once the
area is overwritten by OS tools, it can’t be used with
Normal or Secure again and you will need to obtain a
Recovery CD to retrieve original HDD. Please confirm that
you wish to select Disabled.

FDISK will not delete the Predesktop Area unless you do
this, because it is not visible. You would have to use
ThinkPad Maintenance Diskette to completely wipe the
drive.

To create the Predesktop Area and install the preloaded
system from the recovery CD, do the following:

To create the Predesktop Area:

1. Erase all partitions on the hard disk drive, using FDISK
or a similar application.

2. Boot with the recovery CD (and the boot diskette if
required).

3. The following message is displayed: “Your computer

originally included a Product Recovery program ...
Reinstall the Product Recovery program? (Y/N) [ ]”.

If the hard disk drive contains any partition, you

Note:

do not receive this message; go to step 1.

4. Press the Y key. The Predesktop Area is created and
loaded with the Product Recovery program files.

General descriptions 29

Related service information

Note: If you do not want to create the Predesktop

Area, press the N key, and then go to step 8.

5. At the next window, press Enter to continue.

v The Predesktop Area is created. The system

automatically reboots during this process.

v The recovery process copies some files to the

Predesktop Area, and PKUNZIPs others.

v Follow the prompts. You may be prompted to

change CDs.

v When the process is complete, the system reboots.

Continue to step 6 to install preloaded system.

the preloaded system from the CD:

Install

6. Boot with the recovery CD (and the boot diskette if
required.)

7. If the hard disk drive is blank, the following message
is displayed: “Your computer originally included a

Product Recovery program ... Reinstall the
Product Recovery program? (Y/N) [ ]”.

v To install the Predesktop Area, go to step 4.

v To preload the hard disk drive without installing the

Predesktop Area, press the N key.

8. If you get a message asking which operating system

to install, select the proper operating system and
press Enter.

9. A message is displayed: “Full Recovery:”. Press
Enter to select.

10. On each of the next three windows, press the Y key.

11. Follow the prompts to complete the recovery.

Passwords

As many as three passwords may be needed for any
ThinkPad computer: the power-on password (POP), the
hard disk password (HDP), and the supervisor password
(SVP).

If any of these passwords has been set, a prompt for it
appears on the screen whenever the computer is turned
on. The computer does not start until the password is
entered.

Exception: If only an SVP is installed, the password

30 ThinkPad G40, G41

prompt does not appear when the operating
system is booted.

Related service information

Power-on password:

A power-on password (POP) protects the system from
being powered on by an unauthorized person. The
password must be entered before an operating system can
be booted.

Hard disk password:

There are two hard disk passwords (HDPs):

v User HDP—for the user

v Master HDP—for the system administrator, who can use

it to get access to the hard disk even if the user has
changed the user HDP

There are two modes for the HDP: User only and

Note:

Master + User. The Master + User mode requires

two HDPs; the system administrator enters both in
the same operation. The system administrator then
provides the user HDP to the system user.

Attention: If the user HDP has been forgotten, check

whether a master HDP has been set. If it has, it can be
used for access to the hard disk drive. If no master HDP is
available, neither Lenovo nor Lenovo authorized servicers
provide any services to reset either the user or the master
HDP, or to recover data from the hard disk drive. The hard
disk drive can be replaced for a scheduled fee.

Supervisor password:

A supervisor password (SVP) protects the system
information stored in the BIOS Setup Utility. The SVP must
be entered in order to get access to the BIOS Setup Utility
and make changes to system configuration settings.

Attention: If the SVP has been forgotten and cannot be

made available to the servicer, there is no service
procedure to reset the password. The system board must
be replaced for a scheduled fee.

How to remove the power-on password

To remove a POP that has been forgotten, do the
following:

(A) If no SVP has been set:

1. Turn off the computer.

2. Remove the battery pack.

For how to remove the battery pack, see “1010 Battery
pack” on page 66.

3. Remove the backup battery.

For how to remove the backup battery, see “1060
Backup battery” on page 72.

General descriptions 31

Related service information

4. Turn on the computer and wait until the POST ends.

After the POST ends, the password prompt does not
appear. The POP has been removed.

5. Reinstall the backup battery and the battery pack.

(B) If an SVP has been set and is known by the servicer:

1. Turn on the computer; then, while the “To interrupt
normal startup, press F1” message is displayed at the
lower-left of the screen, press F1.

2. Enter the SVP. Select Start setup utility.

3. Select Security, using the cursor keys to move down
the menu.

4. Select Password.

5. Select Power-On Password.

6. At the Enter Current Password field, enter the SVP.

7. When the Enter New Password field opens, leave it
blank and press Enter twice.

8. In the Changes have been saved window, press Enter.

9. Press F10; then, in the Setup confirmation window,
select Yes.

How to remove the hard disk password

Attention: If User only mode is selected and the user

HDP has been forgotten and cannot be made available to
the neither Lenovo nor Lenovo authorized servicers
provide any services to reset the user HDPs or to recover
data from the hard disk drive. The hard disk drive can be
replaced for a scheduled fee.

To remove a user HDP that has been forgotten, when the
SVP and the master HDP are known, do the following:

1. Turn on the computer; then, while the “To interrupt
normal startup, press the blue Access IBM button”
message is displayed at the lower-left of the screen,
press the Access IBM button.

2. Enter Master HDP. Select Start setup utility. Enter
SVP.

3. Select Security, using the cursor keys to move down
the menu.

4. Select Password.

5. Select Hard-disk x password, where x is the letter of
the hard disk drive. A pop-up window opens.

6. Select Master HDP.

7. Enter the master HDP; then leave the New Password
field blank and press Enter twice.

8. Press F10.

9. Select Yes in the Setup Configuration window.

32 ThinkPad G40, G41

Related service information

Both user HDP and master HDP will have been
removed.

Power management

To reduce power consumption, the computer has three
power management modes: screen blank, standby, and
hibernation.

Screen blank mode

Screen blank mode has three variants, as follows:

1. If you are using the ACPI operating system and you
press Fn+F3,

v The LCD backlight turns off.
v The hard disk drive motor stops.

If the time set on the “Turn off monitor” timer in the

2.
operating system expires,

v The LCD backlight turns off.

To end screen blank mode and resume normal operation,
press any key.

Standby mode

When the computer enters standby mode, the following
events occur in addition to what occurs in screen blank
mode:

v The LCD is powered off.
v The hard disk drive is powered off.
v The CPU stops.

To enter standby mode, press Fn+F4.

Note: You can change the action of Fn+F4, if you are

using the ACPI operating system.

In certain circumstances, the computer goes into standby
mode automatically:

v If a “suspend time” has been set on the timer, and the

user does not do any operation with the keyboard, the
TrackPoint, the hard disk, the parallel connector, or the
diskette drive within that time.

v If the battery indicator blinks orange, indicating that the

battery power is low. (Alternatively, if Hibernate when
battery becomes low has been selected in the “Power

Management Properties” window, the computer goes
into hibernation mode.)

Hibernation mode

In hibernation mode, the following occurs:

v The system status, RAM, VRAM, and setup data are

stored on the hard disk.

v The system is powered off.

General descriptions 33

Related service information

To cause the computer to enter hibernation mode, do any
of the following:

v Press the Fn+F12 keys.

v If you are using the ACPI operating system and have

defined one of the following actions as the event that
causes the system to go into hibernation mode, perform
that action.
– Closing the lid.
– Pressing the power button.
– Pressing Fn+F4 keys.

the computer goes into hibernation mode

Also,
automatically in either of the following conditions:

If a “hibernation time” has been set on the timer, and the

v

user does not do any operation with the keyboard, the
TrackPoint, the hard disk drive, the parallel connector, or
the diskette drive within that time.

v If the timer conditions are satisfied in suspend mode.

When the power is turned on, the computer returns from
hibernation mode and resumes operation. The hibernation
file in the boot record on the hard disk drive is read, and
system status is restored from the hard disk drive.

34 ThinkPad G40, G41

Checkout guide

Checkout guide

Use the following procedures as a guide in identifying and
correcting problems with the ThinkPad computer.

Note: The diagnostic tests are intended to test only

ThinkPad products. The use of non-ThinkPad
products, prototype cards, or modified options can
lead to false indications of errors and invalid system
responses.

1. Identify the failing symptoms in as much detail as
possible.

2. Verify the symptoms. Try to re-create the failure by
running the diagnostic test or by repeating the
operation.

Testing the computer

The ThinkPad computer has a test program called
PC-Doctor
detect errors by running the diagnostics test included in
PC-Doctor. This section is an overview of the procedure.
For details that depend on model-unique functions, refer to
“Product overview” on page 45.

For some possible configurations of the computer,
PC-Doctor might not run correctly. To avoid this problem,
you need to initialize the computer setup by use of the
BIOS Setup Utility before you run PC-Doctor. On the BIOS
Setup Utility screen, press F9, Enter, F10, and then Enter.

®

for DOS (hereafter called PC-Doctor.) You can

Note: When you initialize the computer configuration,

some devices are disabled, such as the serial port.
If you test one of these devices, you will need to
enable it by using PS2.EXE.

To run the test, do as follows:

Note: In the following procedure, you can select an item

not only with the arrow keys, but also with the
TrackPoint. Instead of pressing Enter, click the left
button.

1. Insert the PC-Doctor disk into the diskette drive; then
power on the computer.

If the computer cannot be powered on, go to “Power
system checkout” on page 38, and check the power
sources.

If an error code appears, go to “Symptom-to-FRU
index” on page 52.

On the first screen, select the model and press Enter.
Follow the instructions on the screen.

2. The main panel of PC-Doctor appears.

General descriptions 35

Checkout guide

3. Select Diagnostics with the arrow keys, and press

Enter.

A pull-down menu appears. (Its exact form depends on
the model.)

PC-Doctor menu does not mean the formal

Note:

support device list. Some unsupported device
name may appear in the PC-Doctor menu.

The options on the test menu are as follows:

Diagnostics Interactive Tests

v Run Normal Test
v Run Quick Test
v CPU/Coprocessor
v Systemboard
v Video Adapter
v Parallel Ports
v Fixed Disks
v Diskette Drives
v Other Devices
v Communication
v Wireless LAN
v Memory Test – Full
v Memory Test – Quick

Notes:

v In the Keyboard test in Interactive Tests, the Fn key should

be held down for at least 2 seconds; otherwise, it cannot be
sensed.

v Video Adapter test supports only the LCD display on the

ThinkPad computer. Before running PC-Doctor for DOS, detach
the external monitor.

v Keyboard
v Video
v Internal Speaker
v Mouse
v Diskette
v System Load
v CD-ROM/DVD Test
v Actiontec Wireless Radio

4. Run the applicable function test.

5. Follow the instructions on the screen. If there is a
problem, PC-Doctor shows messages describing it.

6. To exit the test, select Quit — Exit Diag.

To cancel the test, press Esc.

After executing PC-Doctor, check the system

Note:

time/date and reset them if needed.

36 ThinkPad G40, G41

Checkout guide

Detecting system information with PC-Doctor

PC-Doctor can detect the following system information:

Hardware Info

v System Configuration
v Memory Contents
v Physical Disk Drives
v Logical Disk Drives
v VGA Information
v IDE Drive Info
v PCI Information
v PNPISA Info
v SMBIOS Info
v VESA LCD Info

Utility

v Run External Tests
v Surface Scan Hard Disk
v Benchmark System
v DOS Shell
v Tech Support Form
v Battery Rundown
v View Test Log
v Print Log
v Save Log
v Full Erase Hard Drive
v Quick Erase Hard Drive

General descriptions 37

Checkout guide

Power system checkout

To verify a symptom, do the following:

1. Power off the computer.

2. Remove the battery pack.

3. Connect the ac adapter.

4. Check that power is supplied when you power on the
computer.

5. Power off the computer.

6. Disconnect the ac adapter and install the charged
battery pack.

7. Check that the battery pack supplies power when you
power on the computer.

you suspect a power problem, see the appropriate one

If
of the following power supply checkouts:

v “Checking the ac adapter”
v “Checking operational charging” on page 39
v “Checking the battery pack” on page 39
v “Checking the backup battery” on page 40

Checking the ac adapter

You are here because the computer fails only when the ac
adapter is used:

v If the power-on indicator does not turn on, check the

power cord of the ac adapter for correct continuity and
installation.

v If the computer does not charge during operation, go to

″Checking operational charging.″

To check the ac adapter, do the following:

1. Unplug the ac adapter cable from the computer.

2. Measure the output voltage at the plug of the ac
adapter cable. See the following figure:

Pin Voltage (V dc)

1 Vcc_+ 16V

1

2

4

3

2 Ground

3 Vcc_+ 16V

4 Ground

3. If the voltage is not correct, replace the ac adapter.

4. If the voltage is acceptable, do the following:

v Replace the system board.

38 ThinkPad G40, G41

Checkout guide

v If the problem persists, go to “Product overview” on

page 45.

Noise from the ac adapter does not always indicate

Note:

a defect.

Checking operational charging

To check whether the battery charges properly during
operation, use a discharged battery pack or a battery pack
that has less than 50% of the total power remaining when
installed in the computer.

Perform operational charging. If the battery status indicator
or icon does not turn on, remove the battery pack and let it
return to room temperature. Reinstall the battery pack. If
the charge indicator or icon still does not turn on, replace
the battery pack.

If the charge indicator still does not turn on, replace the
system board. Then reinstall the battery pack. If it is still
not charged, go to the next section.

Checking the battery pack

Battery charging does not start until the Power Meter
shows that less than 95% of the total power remains;
under this condition the battery pack can charge to 100%
of its capacity. This protects the battery pack from being
overcharged or from having a shortened life.

To check the status of your battery, move your cursor to
the Power Meter icon in the icon tray of the Windows
taskbar and wait for a moment (but do not click), and the
percentage of battery power remaining is displayed. To get
detailed information about the battery, double-click the
Power Meter icon.

Note: If the battery pack becomes hot, it may not be able

to charge. Remove it from the computer and leave it
at room temperature for a while. After it cools down,
reinstall and recharge it.

To check the battery pack, do the following:

1. Power off the computer.

2. Remove the battery pack and measure the voltage
between battery terminals 1 (+) and 5 (−). See the
following figure:

General descriptions 39

Checkout guide

Terminal Voltage (V dc)

1 + 0 to + 12.6

(Li-ion)

5 Ground

3. If the voltage is less than +11.0 V dc, the battery pack
has been discharged.

Note: Recharging will take at least 3 hours, even if the

indicator does not turn on.

If the voltage is still less than +11.0 V dc after
recharging, replace the battery.

4. If the voltage is more than +11.0 V dc, measure the
resistance between battery terminals 4 and 5. The
resistance must be 4 to 30 K .

If the resistance is not correct, replace the battery
pack. If the resistance is correct, replace the system
board.

Checking the backup battery

The backup battery is rechargeable.

To check the backup battery, do the following:

1. Power off the computer, and unplug the ac adapter
from it.

2. Turn the computer upside down.

3. Remove the battery pack (see “1010 Battery pack” on
page 66).

4. Remove the backup battery (see “Checking the battery
pack” on page 39).

5. Measure the voltage of the backup battery. See the
following figure.

Terminal Voltage (V dc)

+ +2.5 to +3.2

- Ground

v If the voltage is not correct, recharge the backup battery

by connecting the ac adapter to the computer for one
hour.

v If the voltage is still not correct, replace the backup

battery.

40 ThinkPad G40, G41

Checkout guide

v If the backup battery discharges quickly after

replacement, replace the system board.

Note: The backup battery, which is used to preserve

configuration information, such as the date and
time while the computer is turned off, is depleted.

General descriptions 41

Checkout guide

42 ThinkPad G40, G41

ThinkPad G40, G41

Product overview . . . . . . . . . . . .45

Specifications . . . . . . . . . . . .45

Status indicators . . . . . . . . . . .47

FRU tests . . . . . . . . . . . . .49

Fn key combinations . . . . . . . . . .51

Symptom-to-FRU index . . . . . . . . . .52

Numeric error codes . . . . . . . . . .52

Error messages . . . . . . . . . . .56

Beep symptoms . . . . . . . . . . .58

No-beep symptoms . . . . . . . . . .58

LCD-related symptoms . . . . . . . . .59

Intermittent problems . . . . . . . . . .60

Undetermined problems . . . . . . . . .60

FRU replacement notices . . . . . . . . .61

Screw notices . . . . . . . . . . . .61

Retaining serial numbers . . . . . . . . .62

Restoring the serial number of the system unit 62

Retaining the UUID . . . . . . . . .63

Reading or writing the ECA information . . .63

Removing and replacing a FRU . . . . . . . .65

1010 Battery pack . . . . . . . . . . .66

1020 Hard disk drive . . . . . . . . . .67

1030 DIMM door . . . . . . . . . . .69

1040 DIMM . . . . . . . . . . . .70

1050 Modem daughter card (MDC) . . . . .71

1060 Backup battery . . . . . . . . . .72

1070 Keyboard . . . . . . . . . . .73

1080 Middle cover . . . . . . . . . .75

1090 Hinge cover . . . . . . . . . . .76

1095 FDD assembly . . . . . . . . . .77

1100 Blank bezel FDD assembly . . . . . .78

1110 VGA heatsink assembly . . . . . . .79

1120 VGA card assembly . . . . . . . .80

1130 CD-ROM/DVD drive and ODD bracket . . .81

1140 Mini PCI adapter . . . . . . . . .82

1150 PC card slot assembly . . . . . . . .83

1160 LCD and Keyboard bezel assembly . . . .86

1170 LCD assembly . . . . . . . . . .89

1180 Keyboard bezel . . . . . . . . . .92

1190 Fan assembly . . . . . . . . . .94

2000 Fan (CPU 3 GHz) and CPU fixture . . . .96

2010 CPU . . . . . . . . . . . . .98

2020 CD-ROM/DVD drive bracket . . . . . .99

2030 FDD bracket . . . . . . . . . . 100

2040 System board . . . . . . . . . . 101

2050 Lower case assembly . . . . . . . 102

2060 Modem cable . . . . . . . . . . 103

2070 PC card slot assembly . . . . . . . 104

2080 LCD front bezel . . . . . . . . . 105

2090 Inverter card . . . . . . . . . . 106

© Lenovo 2005. Portions © IBM Corp. 2005. 43

3000 Speaker assembly . . . . . . . . 107

3010 LCD cable assembly . . . . . . . . 108

3020 Wireless antenna and rear cover . . . .110

3030 LCD panel and hinge assembly . . . . . 111

Locations . . . . . . . . . . . . . .112

Front view . . . . . . . . . . . . .112

Rear view . . . . . . . . . . . . .113

Bottom view . . . . . . . . . . . .114

Parts list . . . . . . . . . . . . . .115

G40, G41 series . . . . . . . . . . .115

Overall . . . . . . . . . . . . . 139

LCD FRUs . . . . . . . . . . . . 146

14.1 in. TFT . . . . . . . . . . . 147

15 in. TFT . . . . . . . . . . . 147

Keyboard . . . . . . . . . . . . . 149

Recovery CDs . . . . . . . . . . . 150

Windows XP Home Edition (for G40) . . . . 150

Windows XP Home Edition (for G41) . . . . 150

Windows XP Professional (for G40) . . . . 151

Windows XP Professional (for G41) . . . . 152

Windows 2000 (for G40) . . . . . . . 153

Miscellaneous parts . . . . . . . . . . 153

AC adapters . . . . . . . . . . . . 153

Telephone cable . . . . . . . . . . . 153

Optional FRUs . . . . . . . . . . . 154

Common parts list . . . . . . . . . . 154

Tools . . . . . . . . . . . . . 154

Power cords . . . . . . . . . . . 155

Notices . . . . . . . . . . . . . . 156

Trademarks . . . . . . . . . . . . . 158

44 ThinkPad G40, G41

Product overview

Product overview

This section presents the following product-unique
information:

v “Specifications”
v “Status indicators” on page 47
v “FRU tests” on page 49
v “Fn key combinations” on page 51

Specifications

The following table lists the specifications of the ThinkPad
G40, G41 series:

Feature Description

Processor v Intel

Bus
architecture

Memory
(standard)

Memory
(optional)

Graphic
memory

CMOS RAM v 242 bytes

hard disk drive v 30.0 GB, 4200 rpm, 2.5-inch, IDE interface

®

®

Pentium

3.06/3.2/3.46/3.6/3.73 GHz, L2 512 KB cache

v Intel Celeron

4 processor

®

processor 2.4/2.53/2.66/2.8

GHz, L2 128 KB cache

v 400 MHz FSB
v HUB link
v PCI bus
v LPC bus
v 333 MHz DDR SDRAM (PC2700)

v 128 MB DDR SDRAM SO DIMM (PC2700)

card × 1

v 256 MB DDR SDRAM SO DIMM (PC2700)

card × 1

v 512 MB DDR SDRAM SO DIMM (PC2700)

card × 1

v 128 MB DDR SDRAM SO DIMM (PC2700)

card

v 256 MB DDR SDRAM SO DIMM (PC2700)

card

v 512 MB DDR SDRAM SO DIMM (PC2700)
v 1024 MB DDR SDRAM SO DIMM (PC2700)

(maximum

of 2048 MB)

v UMA architecture

v 40.0 GB, 4200 rpm, 2.5-inch, IDE interface
v 40.0 GB, 5400 rpm, 2.5-inch, IDE interface
v 60.0 GB, 7200 rpm, 2.5-inch, IDE interface
v 80.0 GB, 5400 rpm, 2.5-inch, IDE interface

(continued)

ThinkPad G40, G41 45

Product overview

Feature Description

Display v 14.1-inch, 16M colors, XGA (1024 × 768

resolution) TFT color LCD

v 15-inch, 16M colors, XGA (1024 × 768

resolution) TFT color LCD

v 15-inch, 16M colors, SXGA+ (1400 × 1050

resolution) TFT color LCD

I/O port v External monitor connector

v Stereo headphone jack
v Monaural microphone jack
v Parallel connector
v RJ11 connector
v RJ45 connector
v PS/2 mouse connector
v Universal serial bus (USB) connector × 4

Audio v Internal monaural speaker

v Software control volume

Mini PCI
adapter

v IEEE 802.11b wireless LAN card
v IEEE 802.11a/b wireless LAN Combo card

PC Cards v Type-II: two slots

v Type-III: one slot

Modem card v V.90 (V.92 design) modem daughter card

(MDC-2)

AC adapter v 120-watt type

Fixed bays v CD-ROM drive

v DVD drive
v CD-RW/DVD drive
v FDD drive

Preinstalled
operating
system

Windows XP Home Edition

Windows XP Professional
Windows 2000 Professional (Japan only)

46 ThinkPad G40, G41

Product overview

Status indicators

The system status indicators show the status of the
computer, as follows:

1 3

Indicator Meaning

1 Wireless

status

2

Green: Wireless is operational. This

indicator is on when the Wireless is
on and not in suspend mode.

Blinking green:

Data is being transmitted.

Note: The wireless indicator is only available on selected

models.

74 5 6

(continued)

ThinkPad G40, G41 47

Product overview

Indicator Meaning
2 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.

3 Caps lock Green: Caps Lock mode is enabled. To

enable or disable Caps Lock mode,
press the Caps Lock key.

4 Drive in

use

Green: Data is being read from or written

to the hard disk drive or the
diskette drive. 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.

5 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.

6 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.

Note:

If an unauthorized battery is installed,

this indicator starts blinking orange.

7 Standby

status

Green: The computer is in standby mode.
Blinking green:

48 ThinkPad G40, G41

The computer is entering standby
mode or hibernation mode, or is
resuming normal operation.

Product overview

FRU tests

The following table shows the test for each FRU.

FRU Applicable test

System board 1. Diagnostics --> CPU/Coprocessor

Power Diagnostics --> Other Devices --> AC

LCD unit 1. Diagnostics --> Video Adapter

Modem, MDC-2 1. Make sure the modem is set up correctly.

Audio 1. Interactive Tests --> Internal Speaker

Speaker Interactive Tests --> Internal Speaker
PC Card slots 1. Diagnostics --> Systemboard --> PCMCIA

Keyboard 1. Diagnostics --> Systemboard -->

TrackPoint or
pointing device

Hard disk drive Diagnostics --> Fixed Disks
Diskette drive 1. Diagnostics --> Diskette Drives

2. Diagnostics --> Systemboard

Adapter, Battery 1

2. Interactive Tests --> Video

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

2. Diagnostics --> Other Devices --> Analog

Devices AC97 CODEC Test

2. Insert a PC Card Wrap Plug into every PC
Card Slot and run Diagnostics -->

Systemboard --> PCMCIA External Loop

Keyboard

2. Interactive Tests --> Keyboard

If the TrackPoint does not work, check the
configuration in the ThinkPad Configuration
program. If the TrackPoint is disabled, select

Enable 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:

v Interactive Tests --> Mouse

2. Interactive Tests --> Diskette

(continued)

ThinkPad G40, G41 49

Product overview

FRU Applicable test

CD-ROM or
DVD 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 power
switch.

2. Run Diagnostics --> Other Devices -->

Fan.

50 ThinkPad G40, G41

Product overview

Fn key combinations

The following table shows the function of each combination
of Fn with a function key.

Key
combination

Fn+F1 Reserved.

Fn+F2 Reserved.

Fn+F3 Turn off the LCD display, leaving the screen

Fn+F4 Put the computer in standby mode. To return to

Fn+F5 Open the Wireless Radio Control screen.

Fn+F6 Reserved.

Fn+F7 Switch between the computer display and an

Fn+F9 Open the EasyEject Utility screen.

Fn+F10 Reserved.

Fn+F11 Reserved.

Fn+F12 Put the computer into hibernation mode. To

Fn+Home The computer display becomes brighter.

Fn+End The computer display becomes less bright.

Fn+Spacebar Enable the FullScreen Magnifier function.

Description

blank. To turn the LCD display on again, press
any key or the TrackPoint stick.

normal operation, press the Fn key
independently, without pressing a function key.

Note: The setting can be changed so that

pressing it puts the computer into hibernation
mode or even shuts the computer down.

Note: To use this function, the PM device

driver must be installed on the computer.

external monitor (CRT). If an external monitor is
attached, computer output is displayed in the
following three patterns in turn:

v CRT display
v Computer display + CRT display
v Computer display

This setting can be changed so that

Note:

pressing it starts a presentation scheme directly
with no need to start Presentation Director.

Note: This function is supported only in

Windows XP and Windows 2000.

return to normal operation, press the power
button for less than four seconds.

Note: To use Fn+F12 for hibernation, the PM

device driver must be installed on the computer.

ThinkPad G40, G41 51

Symptom-to-FRU index

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, n can 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 60.

Note

For a 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

CRC1, stop

Bad
POST task—The
EEPROM checksum
is not correct.

0177

SVP data, stop

Bad
POST task.

0182

CRC2. Enter

Bad
BIOS Setup and load
Setup Defaults.

0185

startup

Bad
sequence settings.
Enter BIOS Setup
and load setup
defaults.

52 ThinkPad G40, G41

System board.

System board.

Run BIOS Setup Utility and Load Setup
Defaults.

Run BIOS Setup Utility and Load Setup
Defaults

Symptom-to-FRU index

Symptom or error FRU or action, in sequence
0187

EAIA

data access

error—The access to
EEPROM is failed.

0188

RFID

Invalid
serialization
information area or
bad CRC2—The
EEPROM checksum
is not correct.

0189

Invalid

RFID

configuration
information
area—The EEPROM
checksum is not
correct.

0190

low-battery

Critical
error

0191

System

Security —

Invalid remote
change requested.

0199

System

security —

IBM security
password retry count
exceeded.

01C9

More

than one

Ethernet devices are
found. Remove one
of them. Press
<Esc> to continue.

0200

disk error—The

Hard
hard disk is not
working.

System board.

System board.

System board.

1. Charge the battery pack.

2. Battery pack.

The system configuration change has
failed. Confirm the operation and try
again. To clear the error, enter the BIOS
Setup Utility.

1. Confirm supervisor password and
try again.

2. Run BIOS Setup Utility.

1. Remove either a Mini PCI Ethernet

card or an Ethernet daughter card;
or press Esc to ignore the warning
message.

2. System board.

1. Reseat the hard disk drive.

2. Load Setup Defaults in BIOS Setup
Utility.

3. Hard disk drive.

4. System board.

021x

error

Keyboard

0230

RAM

Shadow
error—Shadow RAM
fails at offset nnnn.

0231

RAM

System
error—System RAM
fails at offset nnnn.

0232

RAM

Extended
error—Extended
RAM fails at offset
nnnn.

Run interactive tests of the keyboard
and the auxiliary input device.

System board.

1. DIMM.

2. System board.

1. DIMM.

2. System board.

ThinkPad G40, G41 53

Symptom-to-FRU index

Symptom or error FRU or action, in sequence
0250

System

battery

error—System
battery is dead.

1. Recharge the backup battery for

one hour by connecting the ac
adapter to the computer and run
BIOS Setup Utility to verify the
configuration.

2. Replace the backup battery and run
BIOS Setup Utility to reset the time
and date.

0251

CMOS

System
checksum
bad—Default
configuration used.

1. Recharge the backup battery for

one hour by connecting the ac
adapter to the computer and run
BIOS Setup Utility to verify the
configuration.

2. Replace the backup battery and run
BIOS Setup Utility to reset the time
and date.

0260

System

timer error

1. Recharge the backup battery for

one hour by connecting the ac
adapter to the computer and run
BIOS Setup Utility to verify the
configuration.

2. Replace the backup battery and run
BIOS Setup Utility to reset the time
and date.

3. System board.

0270

time clock error

Real

1. Recharge the backup battery for

one hour by connecting the ac
adapter to the computer and run
BIOS Setup Utility to verify the
configuration.

2. Replace the backup battery and run
BIOS Setup Utility to reset the time
and date.

3. System board.

0271

and time

Date
error—Neither the
date nor the time is
set in the computer.

0280

boot

Previous
incomplete—Default
configuration used.

02D0

System

cache error

02F4

CMOS not

EISA
writable

Run BIOS Setup Utility to reset the time
and date.

1. Load “Setup Default” in BIOS Setup
Utility.

2. DIMM.

3. System board.

1. CPU

1. Load Setup Defaults in BIOS Setup
Utility.

2. Recharge the backup battery for one
hour by connecting the ac adapter to
the computer and run BIOS Setup
Utility to verify the configuration.

3. Replace the backup battery.

4. System board.

54 ThinkPad G40, G41

Symptom-to-FRU index

Symptom or error FRU or action, in sequence
02F5

DMA

test failed

02F6

NMI failed

Software

02F7

timer NMI

Fail-safe
failed

1802

Unauthorized
network card is
plugged in—Power
off and remove the
miniPCI network
card.

1803

Unauthorized
daughter card is
plugged in—Power
off and remove the
daughter card.

1810

Hard
layout error

disk partition

1. DIMM.

2. System board.

1. DIMM.

2. System board.

1. DIMM.

2. System board.

1. Remove Mini PCI network card.

2. System board.

1. Remove the daughter card.

2. System board.

1. If the Access IBM Predesktop Area

has been previously disabled, then
go to the BIOS Setup Utility by
pressing F1 to open the BIOS Setup
Utility. Select Security->Predesktop
Area->Access IBM Predesktop Area.
Set this item to Disabled. Save and
Exit.

2. If the Access IBM Predesktop Area
has 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

RECOVER TO FACTORY CONTENTS

Run FDISK, and then delete all
partitions. Run Startup in Access IBM
Predesktop Area. Boot from Recovery
CD and perform full recovery from it.

5. If item 4 failed, replace the hard disk
drive.

ThinkPad G40, G41 55

Symptom-to-FRU index

Error messages

Symptom or error FRU or action, in sequence

Device address
conflict.

Allocation error for
device.

Failing bits: nnnn. 1. DIMM.

Invalid system
configuration data.

I/O device IRQ
conflict.

Operating system not
found.

Hibernation error. 1. Restore the system configuration to

Fan error. Fan.

1. Load “Setup Defaults” in BIOS
Setup Utility.

2. Recharge the backup battery for one
hour by connecting the ac adapter to
the computer and run BIOS Setup
Utility to verify the configuration.

3. Backup battery.

4. System board.

1. Load “Setup Defaults” in BIOS
Setup Utility.

2. Recharge the backup battery for one
hour by connecting the ac adapter to
the computer and run BIOS Setup
Utility to verify the configuration.

3. Backup battery.

4. System board.

2. System board.

1. DIMM.

2. System board.

1. Load “Setup Defaults” in BIOS
Setup Utility.

2. Recharge the backup battery for one
hour by connecting the ac adapter to
the computer and run BIOS Setup
Utility to verify the configuration.

3. Backup battery.

4. System board.

1. Check that the operating system has
no failure and is installed correctly.

2. Enter 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.

what it was before the computer
entered hibernation mode.

2. If memory size has been changed,
re-create the hibernation file.

56 ThinkPad G40, G41

Symptom-to-FRU index

Symptom or error FRU or action, in sequence

EMM386 Not
Installed — Unable
to Set Page Frame
Base Address.

Edit C:\CONFIG.SYS and change a line
from

device=C:\WINDOWS\EMM386.EXE RAM

to

device=C:\WINDOWS\EMM386.EXE NOEMS

and save this file.

CardBus
Configuration Error
—Device Disabled

Thermal sensing
error.

Press F1 to go to the BIOS Setup Utility.
Press F9 and then Enter to load the
default setting.

Press F10 and then Enter to restart the
system.

System board.

ThinkPad G40, G41 57

Symptom-to-FRU index

Beep symptoms

Symptom or error FRU or action, in sequence

One beep and a blank,
unreadable, or flashing LCD.

One long and two short beeps,
and a blank or unreadable
LCD.

Two short beeps with error
codes.

Two short beeps and a blank
screen.

Three short beeps, pause,
three more short beeps, and
one short beep.

One short beep, pause, three
short beeps, pause, three more
short beeps, and one short
beep.

Only cursor appears. Reinstall operating system.

Five short beeps and a blank
screen.

1. Reseat the LCD
connector.

2. LCD assembly.

3. External CRT.

4. System board.

1. System board.

2. LCD assembly.

3. DIMM.

POST error. See “Numeric
error codes” on page 52.

1. System board.

2. DIMM.

1. DIMM.

2. System board

System board

No-beep symptoms

Symptom or error FRU or action, in sequence

No beep, power-on indicator
on, LCD blank, and no POST.

No beep, power-on indicator
on, and LCD blank during
POST.

The power-on password prompt
appears.

The hard disk password prompt
appears.

The DOS full screen looks
smaller.

58 ThinkPad G40, G41

1. Make sure that every
connector is connected
tightly and correctly.

2. DIMM.

3. System board.

1. Reseat DIMM.

2. System board.

A power-on password or a
supervisor password is set.
Type the password and press
Enter.

A hard disk password is set.
Type the password and press
Enter.

Start the ThinkPad
Configuration program and set
the Screen expansion
function.

Symptom-to-FRU index

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 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.

A bright dot means a pixel is always on

Note:

(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.

v LCD backlight not working.
v LCD too dark.
v LCD brightness cannot be

adjusted.

v LCD contrast cannot be

adjusted.

v LCD screen unreadable.
v Characters missing pixels.
v Screen abnormal.
v Wrong color displayed.

Horizontal or vertical lines
displayed on LCD.

System board.

1. Reseat the LCD
connectors.

2. LCD assembly.

3. System board.

1. See important note for

“LCD-related symptoms.”

2. Reseat all LCD connectors.

3. LCD assembly.

4. System board.

LCD assembly.

ThinkPad G40, G41 59

Symptom-to-FRU index

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

mode at least 10 times.

2. If no error is detected, do not replace 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

If the diagnostic tests did not identify the adapter or device
that has failed, if wrong devices are installed, or if the
system simply is not operating, 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 38.)

1. Turn 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-ThinkPad 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. Turn on the computer.

5. Determine whether the problem has been solved.

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

60 ThinkPad G40, G41

FRU replacement notices

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 the
ThinkPad computer, this problem is addressed with special
nylon-coated screws that have the following characteristics:

v They maintain tight connections.
v They do not easily come loose, even with shock or

vibration.

v They are harder to tighten.
v Each one should be used only once.

the following when you service this machine:

Do

v Keep the screw kit (for the P/N, see “Miscellaneous

parts” on page 153) in your tool bag.

v Always use new screws.
v Use a torque screwdriver if you have one.

screws as follows:

Tighten

v Plastic to plastic

Turn an additional 90 degrees after the screw head
touches the surface of the plastic part:

90 degrees more

(Cross-section)

v Logic card to plastic

Turn an additional 180 degrees after the screw head
touches the surface of the logic card:

180 degrees more

(Cross-section)

v Torque driver

If you have a torque driver, refer to the “Torque” column
for each step.

ThinkPad G40, G41 61

FRU replacement notices

v Make sure that 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 that all of 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” on page 63
v “Reading or writing the ECA information” on page 63

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 or later, and restart the computer.

2. From the main menu, select 1. Set System
Identification.

3. Select 2. Read S/N data from EEPROM.

The serial number of each device in your computer is
displayed; the serial number of the system unit is listed as
follows:

v 20: Serial number

Write down that number.

Note: The serial number of the system unit is also written

on the label attached to the bottom of the computer.

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 or later and restart the computer.

2. From the main menu, select 1. Set System
Identification.

3. Select 1. Add S/N data from EEPROM.

Follow the instructions on the screen.

62 ThinkPad G40, G41

FRU replacement notices

Retaining the UUID

The Universally Unique Identifier (UUID) is a 128-bit
number uniquely assigned to your computer at production
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 or later, and restart the computer.

2. From the main menu, select 4. Assign UUID.

A new UUID is created and written. If a valid UUID
already exists, it is not overwritten.

Reading or writing the ECA information

Information on Engineering Change Announcements (ECA)
are stored in the EEPROM of the system board. The
electronic storage of this information simplifies the
procedure to check if the ECA has been previously applied
to a machine. The machine does not need to be
disassembled to check for the ECA application.

To check what ECAs have been previously applied to the
machine, use the ECA Information Read/Write function on
the ThinkPad Hardware Maintenance Diskette Version 1.69
or later.

1. Insert the ThinkPad Hardware Maintenance Diskette
Version 1.69 or later, and restart the computer.

2. From the main menu, select 6. Set ECA Information.

3. To read ECA information, select 2. Read ECA/rework

number from EEPROM and follow the instruction.

4. To read box build date, select 5. Read box build date
from EEPROM, and follow the instruction on the

screen.

After an ECA has been applied to the machine, the
EEPROM must be updated to reflect the ECA's
application. Use the ThinkPad Hardware Maintenance
Diskette Version 1.69 or later to update the EEPROM.

Note: Only the ECA number is stored in the EEPROM.

The machine type of the ECA is assumed be the
same as the machine type of the machine that had
the ECA applied to it.

1. Insert the ThinkPad Hardware Maintenance Diskette
Version 1.69 or later, and restart the computer.

2. From the main menu, select 6. Set ECA Information.

ThinkPad G40, G41 63

FRU replacement notices

3. To write ECA information, select 1. Write ECA/rework
number from EEPROM, and follow the instruction.

4. To write box build date, select 4. Write box build date
from EEPROM, and follow the instruction on the

screen.

If the system board is being replaced, try to read the ECA
information from the old system board and transfer the
information to the new system. If the system board is
inoperable, this will not be possible.

64 ThinkPad G40, G41

Removing and replacing a FRU

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 61.

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 given in the drawings by the numbers in
square callouts.

5. When turning a screw to replace a FRU, turn it in the
direction as given by the arrow in the drawing.

6. When removing the FRU, move it in the direction as
given 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 112.

8. When replacing a FRU, use the correct screw as
shown in the procedures.

DANGER

Before

removing any FRU, turn off the computer,

unplug all power cords from electrical outlets,
remove the battery pack, and then disconnect any
interconnecting cables.

Attention: After replacing a FRU, do not turn on the

computer until you have made sure that all screws,
springs, and other small parts are in place and none are
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).

ThinkPad G40, G41 65

Removing and replacing a FRU

1010 Battery pack

DANGER

Use only the battery in the parts listing for the model you are
servicing. Use of an incorrect battery can result in ignition or
explosion of the battery.

66 ThinkPad G40, G41

Removing and replacing a FRU

1020 Hard disk drive

Attention

v Do not drop or apply any shock to the hard

disk drive. The hard disk drive is sensitive to

physical shock. Improper handling can cause
damage and permanent loss of data.

v Before removing the drive, have the user make a

backup copy of all the information on the drive if
possible.

v Never remove the drive while the system is

operating or is in suspend mode.

For access, remove this FRU:

v “1010 Battery pack” on page 66

1

Note: The hard disk drive is attached to the cover.

Step Screw (quantity)

1 HDD M3 × 4 mm, Black (1)

Note: Use a 2.5-mm Allen wrench to remove the security screw.

(continued)

ThinkPad G40, G41 67

Removing and replacing a FRU

3

4

When installing: Make sure that the hard disk connector

is firmly attached.

68 ThinkPad G40, G41

Removing and replacing a FRU

1030 DIMM door

For access, remove this FRU:

v “1010 Battery pack” on page 66

Loosen the screws 1, but do not remove them.

Note:

Step Screw (quantity) Torque

1 M2.5 captive screw (2) Nm 0.3 Nm

3.2 kgfcm)

(

ThinkPad G40, G41 69

Removing and replacing a FRU

1040 DIMM

For access, remove these FRUs, in order:

v “1010 Battery pack” on page 66
v “1030 DIMM door” on page 69

When installing: With the notched end of the DIMM

toward the socket, insert the DIMM into
the socket, and then press it firmly. Pivot
the DIMM until it snaps into place. Make
sure that the card is firmly fixed in the
slot and does not move easily.

70 ThinkPad G40, G41

Removing and replacing a FRU

1050 Modem daughter card (MDC)

For access, remove this FRU:

v “1010 Battery pack” on page 66
v “1030 DIMM door” on page 69

Step Screw (quantity) Torque

1 M2.5 x 5 mm, Silver (2) Nm 0.3

(3.2

ThinkPad G40, G41 71

kgfcm)

Removing and replacing a FRU

1060 Backup battery

DANGER

Use only the battery in the parts listing for the computer you
are servicing. Use of an incorrect battery can result in
ignition or explosion of the battery.

For access, remove these FRUs, in order:

v “1010 Battery pack” on page 66
v “1030 DIMM door” on page 69

72 ThinkPad G40, G41

Removing and replacing a FRU

1070 Keyboard

For access, remove these FRUs, in order:

v “1010 Battery pack” on page 66

Step Screw (quantity) Torque

1 M2.5 × 7 mm, Black (2) Nm 0.3

(continued)

1

(3.2

kgfcm)

ThinkPad G40, G41 73

Removing and replacing a FRU

4

3

2

In step 2, push the keyboard from the bottom, while at
the same time pushing a little in the direction of the arrow
in step 3. Take care not to bend the keyboard when
lifting it at step 4.

5

74 ThinkPad G40, G41

Removing and replacing a FRU

1080 Middle cover

For access, remove these FRUs, in order:

v “1010 Battery pack” on page 66
v “1070 Keyboard” on page 73

Step Screw (quantity) Torque

1 M2.5 × 8 mm, Black (1) Nm 0.3

(3.2

kgfcm)

Note: The bottom-side screw that secures the middle

cover may be a security or tamper-proof screw for

802.11a/b wireless models.

ThinkPad G40, G41 75

Removing and replacing a FRU

1090 Hinge cover

For access, remove this FRU:

v “1010 Battery pack” on page 66
v “1070 Keyboard” on page 73
v “1080 Middle cover” on page 75

When installing: Align the hinge cover squarely and push

down.

76 ThinkPad G40, G41

Removing and replacing a FRU

1095 FDD assembly

For access, remove these FRUs, in order:

v “1010 Battery pack” on page 66
v “1070 Keyboard” on page 73

Step Screw (quantity) Torque

1 M2.5 × 5 mm, Silver (1) 0.3 Nm

(3.2

ThinkPad G40, G41 77

kgfcm)

Removing and replacing a FRU

1100 Blank bezel FDD assembly

For access, remove these FRUs, in order:

v “1010 Battery pack” on page 66
v “1070 Keyboard” on page 73

1

2

Step Screw (quantity) Torque

1 M2.0 × 4 mm, Silver (2) 0.3 Nm

2

kgfcm)

(3.2

2

When Installing: Be sure the corners of the FDD cover

go under the clasps on the FDD
bracket.

78 ThinkPad G40, G41

Removing and replacing a FRU

1110 VGA heatsink assembly

For access, remove these FRUs, in order:

v “1010 Battery pack” on page 66
v “1070 Keyboard” on page 73

2

1

1

Step Screw (quantity) Torque

1 M2.0 × 4 mm, Silver (3) 0.3 Nm

(3.2

ThinkPad G40, G41 79

kgfcm)

Removing and replacing a FRU

1120 VGA card assembly

For access, remove these FRUs, in order:

v “1010 Battery pack” on page 66
v “1070 Keyboard” on page 73
v “1110 VGA heatsink assembly” on page 79

5

4

1

2

Step Screw (quantity) Torque

4 M2.0 × 4 mm, Silver (1) 0.3 Nm

(3.2

3

kgfcm)

80 ThinkPad G40, G41

Removing and replacing a FRU

1130 CD-ROM/DVD drive and ODD bracket

For access, remove these FRUs, in order:

v “1010 Battery pack” on page 66
v “1070 Keyboard” on page 73

1

2

Step Screw (quantity) Torque

1 M2.5 stud Phillips × 5 mm, Silver (1) 0.3 Nm

(3.2

3

3

ThinkPad G40, G41 81

kgfcm)

Removing and replacing a FRU

1140 Mini PCI adapter

For access, remove these FRUs, in order:

v “1010 Battery pack” on page 66
v “1070 Keyboard” on page 73
v “1080 Middle cover” on page 75

82 ThinkPad G40, G41

Removing and replacing a FRU

1150 PC card slot assembly

For access, remove these FRUs, in order:

v “1010 Battery pack” on page 66
v “1030 DIMM door” on page 69
v “1070 Keyboard” on page 73
v “1080 Middle cover” on page 75
v “1090 Hinge cover” on page 76
v “1130 CD-ROM/DVD drive and ODD bracket” on page

81

v “1140 Mini PCI adapter” on page 82

Step Screw (quantity) Torque

1 M2.5 × 8 mm, Black (2) 0.3 Nm

(3.2

(continued)

ThinkPad G40, G41 83

kgfcm)

Removing and replacing a FRU

Loosen the two screws at 2 about half-way out. Then,
push down firmly on both screws in the direction of the
arrow 3 to disconnect the PC card slot assembly from
the system board.

Step Screw (quantity) Torque

2 M2.5 × 8 mm, Black (2) 0.3 Nm

(3.2

kgfcm)

Push the PC card eject buttons 4 to pop the buttons out.
While holding the PC card door down, pull on the PC card
eject buttons and carefully remove the PC card slot
assembly 5.

(continued)

84 ThinkPad G40, G41

Removing and replacing a FRU

4

5

When installing: At steps 2 and 3, tighten the two

new screws slowly until both screws
have caught the first threads of the
screw holes on the PC card slot
assembly. Then, tighten each screw one
turn at a time, alternating between
screws to evenly pull the assembly
connector onto the system board
connector.

ThinkPad G40, G41 85

Removing and replacing a FRU

1160 LCD and Keyboard bezel assembly

For access, remove these FRUs, in order:

v “1010 Battery pack” on page 66
v “1070 Keyboard” on page 73
v “1080 Middle cover” on page 75
v “1090 Hinge cover” on page 76

1

Step Screw (quantity) Torque

1 M2.5 × 7 mm, Black (2) 0.3 Nm

(3.2

kgfcm)

3

(continued)

86 ThinkPad G40, G41

2

Removing and replacing a FRU

Non-FDD models: The VGA connector for non-FDD

models is as shown below.

4

5

4

Step Screw (quantity) Torque

4 M 2.5 × 7 mm, Black (9) 0.3 Nm

5 M 2.5 × 3 mm, Silver (1) 0.3 Nm

(3.2

(3.2

6

(continued)

ThinkPad G40, G41 87

kgfcm)

kgfcm)

Removing and replacing a FRU

When installing: Make sure the red band A on the LCD

cable is aligned with the corner of the
keyboard bezel under the hinge.

A

88 ThinkPad G40, G41

Removing and replacing a FRU

1170 LCD assembly

For access, remove these FRUs, in order:

v “1010 Battery pack” on page 66
v “1070 Keyboard” on page 73
v “1080 Middle cover” on page 75
v “1090 Hinge cover” on page 76

Step Screw (quantity) Torque

1 M2.5 × 7 mm, Black (2) 0.3 Nm

(3.2

1

kgfcm)

(continued)

3

2

ThinkPad G40, G41 89

Removing and replacing a FRU

Non-FDD models: The VGA connector for non-FDD

models is as shown below.

5

4

4

Step Screw (quantity) Torque

4 M 2.5 × 7 mm, Silver (4) 0.3 Nm

(3.2

(continued)

90 ThinkPad G40, G41

kgfcm)

Removing and replacing a FRU

When installing: Make sure the red band A on the LCD

cable is aligned with the corner of the
keyboard bezel under the hinge.

A

ThinkPad G40, G41 91

Removing and replacing a FRU

1180 Keyboard bezel

For access, remove these FRUs, in order:

v “1010 Battery pack” on page 66
v “1030 DIMM door” on page 69
v “1070 Keyboard” on page 73
v “1080 Middle cover” on page 75
v “1090 Hinge cover” on page 76
v “1170 LCD assembly” on page 89

2

1

1

Step Screw (quantity) Torque

1 M 2.5 × 7 mm, Black (9) 0.3 Nm

2 M 2.5 × 3 mm, Silver (1) 0.3 Nm

(3.2

(3.2

(continued)

92 ThinkPad G40, G41

kgfcm)

kgfcm)

Removing and replacing a FRU

Remove the keyboard bezel in the direction of arrow 3.

ThinkPad G40, G41 93

Removing and replacing a FRU

1190 Fan assembly

For access, remove these FRUs, in order:

v “1010 Battery pack” on page 66
v “1030 DIMM door” on page 69
v “1070 Keyboard” on page 73
v “1080 Middle cover” on page 75
v “1090 Hinge cover” on page 76
v “1160 LCD and Keyboard bezel assembly” on page 86

To prevent the CPU from being pulled from the socket
when the fan is removed, remove the screw 2and
reinsert it 3. Then carefully turn the screw to separate
the fan as you lift up 4.

1

2

4

5

6

Step Screw (quantity) Torque

1 M2.5 captive × (4) 0.3 Nm

(3.2

(continued)

3

kgfcm)

94 ThinkPad G40, G41

Removing and replacing a FRU

When installing: Apply 1 gram (approx.) of thermal

grease to the underside of the fan
assembly, spreading it evenly with the
provided spatula. Do not apply thermal
grease directly to the CPU. Then, when
the fan is in place, tighten the screws in
this order: A; B; and C.

Caution: When installing, be sure the screw that was

moved from position 2 to 3 above, is
returned to its original location.

ThinkPad G40, G41 95

Removing and replacing a FRU

2000 Fan (CPU 3 GHz) and CPU fixture

For access, remove these FRUs, in order:

v “1010 Battery pack” on page 66
v “1030 DIMM door” on page 69
v “1070 Keyboard” on page 73
v “1080 Middle cover” on page 75
v “1090 Hinge cover” on page 76
v “1160 LCD and Keyboard bezel assembly” on page 86

To prevent the CPU from being pulled from the socket
when the fan is removed, remove the screw 2and
reinsert it 3. Then carefully turn the screw to separate
the fan as you lift up 4.

Step Screw (quantity) Torque

1 M2.5 captive × (4) 0.3 Nm

(3.2

(continued)

96 ThinkPad G40, G41

kgfcm)