ThinkPad G41
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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
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