Lenovo G40 Manual

							Downloaded from www.Manualslib.com manuals search engine Lenovo G40-30/G40-45/
G40-70/G40-70m/ 
Z40-70/Z40-75
Hardware 
Maintenance 
Manual  
						

							Downloaded from www.Manualslib.com manuals search engine Notes:
•	 Before	using	this 	information 	and 	the 	product 	it 	supports, 	be 	sure 	to 	read 	the 	general 	information 	under 	“Notices”	on	page	86.
•	 This	manual 	 applies	 to 	 the 	 following 	 models: 	 Lenovo 	 G40-30/G40-45/G40-70/G40-70m/Z40-70/Z40-75.		The	illustrations	used	in	this	manual	are	for	Lenovo	G40-70	unless	otherwise	stated.
First Edition (Apr. 2014)
© Copyright Lenovo 2014. All rights reserved.
LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant a General 
Services Administration “GSA” contract, use, reproduction, or disclosure is subject to restrictions set 
forth in Contract No. GS-35F-05925.
© 2014 Lenovo  
						

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Contents
About this manual .......................................iv
Safety information
 ........................................1
General safety ................................................2
Electrical safety ..............................................3
Safety inspection guide ..................................5
Handling devices that are sensitive to 
electrostatic discharge
 ....................................6
Grounding requirements .................................6
Safety notices: multilingual translations ..........7
Laser compliance statement .........................14
Important service information
 ...................16
Strategy for replacing FRUs .........................16Strategy for replacing a hard disk drive ............17
Important notice for replacing a system   
board  ................................................................ 17
Important information about replacing RoHS 
compliant FRUs ............................................18
General checkout 
 ......................................19
What to do first .............................................20
Power system checkout ................................21
Checking the AC adapter  .................................21
Checking operational charging .........................21
Checking the battery pack ................................22
Related service information ......................23
Restoring the factory contents by using   
OneKey Recovery
 ........................................23Restore of factory default .................................23Passwords ....................................................24Power-on password ..........................................24
Hard-disk password ..........................................24
Administrator password ....................................24Power management .....................................25Screen blank state ............................................25
Putting the computer to sleep or shutting   
it down
 ..............................................................25
Putting your computer to sleep .........................25
Shutting down the computer .............................25
Lenovo G40-30/G40-45/G40-70/G40-70m/  
Z40-70/Z40-75 ..............................................26
Specifications ...............................................26
Status indicators ...........................................29
Hotkeys......................................................... 30
FRU replacement notices
 .............................31Screw notices  ..................................................31Removing and replacing an FRU .................321010 Battery pack .............................................33
1020 Base cover ...............................................34
1030 Optical drive .............................................36 1040 Hard disk drive
 .........................................37
1050 PCI Express Mini Card for   
wireless LAN
 .....................................................39
1060 DIMM .......................................................41
1070 Fan assembly ..........................................42
1080 Keyboard .................................................44
1090 Keyboard bezel .........................................471100 USB&audio board ....................................50
111 0  System board ............................................521120 Heat sink assembly ..................................55
1130 Speakers and DC-in cable .......................56
1140 LCD unit ...................................................58
1150 LCD front bezel, LCD panel, and   
hinges
 ...............................................................60
1160 Camera ....................................................63
1170 LCD cable and antenna assembly ...........65Locations ......................................................66Front view and right-side view ..........................66
Bottom and Left-side view  ...............................67Parts list ........................................................68Overall ..............................................................69
LCD FRUs ........................................................77
Keyboard ..........................................................79
Miscellaneous parts ..........................................81
AC adapters ......................................................82
Screw ................................................................82
Power cords ......................................................83
Notices......................................................... 86
Trademarks ..................................................87  
						

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About this manual
This manual contains service and reference information for the following\
 
Lenovo product:Lenovo G40-30/G40-45/G40-70/G40-70m/Z40-70/Z40-75
Use this manual to troubleshoot problems.
The manual is divided into the following sections:
• The common sections provide general information, guidelines, and safety 
information required for servicing computers.
• The product-specific section includes service, reference, and product-specific 
parts information.
Important:
This	manual 	is 	intended 	only 	for 	trained 	servicers 	who 	are 	familiar 	with 	Lenovo	products.
	 Use 	 this 	 manual 	 to 	 troubleshoot 	 problems 	 effectively.
Before
	
servicing
 	
a
 	
Lenovo
 	
product,
 	
make
 	
sure
 	
to
 	
read
 	
all
 	
the
 	
information
 	
under	“Safety

	 information” 	 on 	 page 	 1
	
 and 	 “Important 	 service 	 information” 	 on 	 page 	 16. 	  
						

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Safety information
Safety information
This chapter presents the following safety information that you need to get 
familiar with before you service a Lenovo G40-30/G40-45/G40-70/G40-70m/
Z40-70/Z40-75 computer:
• “General safety” on page 2
• “Electrical safety” on page 3
• “Safety inspection guide” on page 5
• “Handling devices that are sensitive to electrostatic discharge” o\
n page 6
• “Grounding requirements” on page 6
• “Safety notices: multilingual translations” on page 7
• “Laser compliance statement” on page 14  
						

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G40-30/G40-45/G40-70/G40-70m/Z40-70/Z40-75 Hardware Maintenance Manual
General safety
Follow these rules below to ensure general safety:
• Observe a good housekeeping in the area where the machines are put 
during and after the maintenance.
• When lifting any heavy object: 
1. Make sure that 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 it.
4. Lift it by standing  or pushing up with your leg muscles; this action could avoid the strain from the muscles in your back. Do not attempt to lift a\
ny 
object that weighs more than 16 kg (35 lb) or that you think is too heavy 
for you.
• Do not perform any action that causes hazards to the customer, or that 
makes the machine unsafe.
• Before you start the machine, make sure that other service representatives 
and the customer are not in a hazardous position.
• Please remove covers and other parts in a safe place, away from all 
personnel, while you are servicing the machine.
• Keep your toolcase away from walk areas so that other people will not trip 
over it.
• Do not wear loose clothing that can be trapped in the moving parts of the 
machine. Make sure that your sleeves are fastened or rolled up above your 
elbows. If your hair is long, fasten it.
• Insert the ends of your necktie or scarf inside clothing or fasten it with the 
nonconductive clip, about 8 centimeters (3 inches) from the end.
• Do not wear jewelry, chains, metal-frame eyeglasses, or metal fasteners for 
your clothing.
Attention:  Metal objects are good electrical conductors.
• Wear safety glasses when you are hammering, drilling, soldering, cutting 
wire, attaching springs, using solvents, or working in any other conditions 
that may be hazardous to your eyes.
• After service, reinstall all safety shields, guards, labels, and ground \
wires. 
Replace any safety device that is worn or defective.
• Reinstall all covers correctly before returning the machine to the custo\
mer.
• Fan louvers on the machine help to prevent the overheating of internal 
components. Do not obstruct fan louvers or cover them with labels or 
stickers.  
						

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Safety information
Electrical safety
Observe the following rules when working on electrical equipments.
Important:
Use	only	approved 	tools 	and 	test 	equipments. 	Some 	hand 	tools 	have 	handles	covered
	with 	a 	soft 	material 	that 	does 	not 	insulate 	you 	when 	working 	with 	live	electrical

	 currents.
Many
	
c
 ustomers 	
ha
 ve
	rubbe
 r 	
fl
 oor 	
m
 ats 	
ne
 ar 	
t
 heir 	
m
 achines 	
t
 hat
	c
 ontain 	
sm
 all
	conductive

	
fibers
 	
to
 	
decrease
 	
electrostatic
 	
dischar
 ges. 	
Do
 	
not
 	
use
 	
such
 	
kind
 	
of
 	
mat	to

	 protect 	 yourself 	 from 	 electrical 	 shock. 	
• Find the room emergency power-off (EPO) switch, disconnecting switch or 
electrical outlet. If an electrical accident occurs, you can then operat\
e the 
switch or unplug the power cord quickly. 
• Do not work alone under hazardous conditions or near the equipment that 
has hazardous voltages.
• 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 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.
• If you need to work on a machine that has exposed electrical circuits, 
observe the following precautions:
– Ensure that another person, familiar with the power-of f 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 cont rols 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; 
instructions for these precautions are in the safety sections of maintenance 
information. Be extremely careful when you measure the  high voltages.
• Regularly inspect and maintain your electrical hand tools for safe operational 
condition. 
• Do not use worn or broken tools and testers.
• Never assume that power has been disconnected from a circuit. First, check 
it to make sure that it has been powered off.   
						

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G40-30/G40-45/G40-70/G40-70m/Z40-70/Z40-75 Hardware Maintenance Manual
• 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. 
• 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.
• 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
and similar units. (This practice ensures correct grounding of the unit\
s.)
• If an electrical accident occurs:
– Caution: do not become a victim yourself.
– Switch off the power.
– Send the victim to get medical aid.  
						

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Safety information
Safety inspection guide
The purpose of this inspection guide is to assist you in identifying pot\
ential 
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 according to the attachment of non-Lenovo 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: 
• Electrical hazards, especially primary power (primary voltage on the frame 
can cause serious or fatal electrical shock) 
• Explosive hazards, such as a damaged CRT face or a bulging capacitor
• Mechanical hazards, such as loose or missing hardware
To determine whether there are any potential unsafe 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. Turn 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 the frame ground.
b. The power cord should be the type  specified in the parts list.
c. Insulation must not be frayed or worn.
4. Check for cracked or bulging batteries.
5. Remove the cover.
6. Check for any obvious non-Lenovo alterations. Use good judgment as to th\
e  safety of any non-Lenovo alterations.
7. 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.
8. Check for worn, frayed, or pinched  cables.
9. Check that the power-supply cover fasteners (screws or rivets) have no\
t  been removed or tampered with.  
						

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G40-30/G40-45/G40-70/G40-70m/Z40-70/Z40-75 Hardware Maintenance Manual
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:
• Keep the parts in protective packages until they are inserted into the p\
roduct. 
• Avoid contact with other people.
• Wear a grounded wrist strap against your skin to eliminate static on your 
body.
• Prevent the part from touching your clothing. Most clothing is insulative and 
retains a charge even when you are wearing a wrist strap.
• 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.
• 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 	to 	guard 	against 	ESD 	damage 	is 	desirable 	but 	not 	necessary
. 	
– Attach the ESD ground  clip to any frame ground, ground braid, or green-wire ground.
– When working on a double-insulated or battery-operated system, use an ESD common ground or reference point. You can use coax or connector-
outside shells on these systems.
– Use the round g round 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.