Lenovo G50 Manitenance Manual

							Lenovo G50-70/G50-70m/
Z50-70
Hardware 
Maintenance 
Manual 
						

							Notes:
•	Before using this information and the product it supports, be sure to read the general information under “Notices” on page 85.
•	This manual applies to the following models: Lenovo G50-70/G50-70m/Z50-70. The illustrations used in this manual are for Lenovo G50-70 unless otherwise stated.
First Edition (Dec. 2013)
© Copyright Lenovo 2013. 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.
©	2013	Lenovo 
						

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Contents
About this manual .......................................iv
Safety information ........................................1General	safety	................................................2Electrical	safety	 ..............................................3Safety	inspection	guide	..................................5Handling	devices	that	are	sensitive	to	electrostatic	discharge	....................................6Grounding	requirements	.................................6Safety	notices:	multilingual	translations..........7Laser	compliance	statement.........................14
Important service information ...................16Strategy	for	replacing	FRUs	 .........................16Strategy	for	replacing	a	hard	disk	drive	............17Important	notice	for	replacing	a	system	board		......17Important	information	about	replacing		RoHS	compliant	FRUs	 .................................18
General checkout  ......................................19What	to	do	first	.............................................20Power	system	checkout................................21Checking	the	 AC	adapter		.................................21Checking	operational	charging	 .........................21Checking	the	battery	pack	 ................................22
Related service information ......................23Restoring	the	factory	contents	by	using		OneKey	Recovery	 ........................................23Restore	of	factory	default	 .................................23Passwords	....................................................24Power-on	password	..........................................24Hard-disk	password	 ..........................................24Administrator	password	 ....................................24Power	management	 .....................................25Screen	blank	state	............................................25Putting	the	computer	to	sleep	or	shutting	it	down	 ......25Putting	your	computer	to	sleep	.........................25Shutting	down	the	computer	.............................25
Lenovo G50-70/G50-70m/Z50-70 ...............26Specifications	 ...............................................26Status	indicators	...........................................28Hotkeys.........................................................29FRU	replacement	notices	.............................30Screw	notices		 ..................................................30Removing	and	replacing	an	FRU	 .................311010	Battery	pack	.............................................321020	Base	cover	...............................................331030	Optical	drive	.............................................351040	Hard	disk	drive	.........................................361050	PCI	Express	Mini	Card	for	wireless	LAN	......38
1060	DIMM	 .......................................................401070	Fan	assembly	 ..........................................411080	Keyboard	.................................................431090	Keyboard	bezel	.........................................461100	ODD	board	and	USB&audio	board	..........49111 0 	System	board	............................................531120	Heat	sink	assembly	..................................561130	Speakers	and	DC-in	cable	 .......................571140	LCD	unit	 ...................................................591150	LCD	front	bezel,	LCD	panel,	and	hinges	......611160	Camera	 ....................................................641170	LCD	cable	and	antenna	assembly	...........66Locations	 ......................................................67Front	view	and	right-side	view	..........................67Bottom	and	Left-side	view		 ...............................68Parts	list	........................................................69Overall	 ..............................................................70LCD	FRUs	 ........................................................76Keyboard	..........................................................78Miscellaneous	parts	..........................................80AC	adapters	......................................................81Screws	 ..............................................................81Power	cords	......................................................82
Notices.........................................................85Trademarks	 ..................................................86 
						

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About this manual
This	manual	 contains	 service	and	reference	 information	 for	the	 following 	Lenovo	product:
Lenovo G50-70/G50-70m/Z50-70
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 .  
						

							1
Safety information
Safety information
This	chapter	 presents	 the	following	 safety	information	 that	you	need	 to	get 	familiar	with	before	you	service	a	Lenovo	G50-70/G50-70m/Z50-70	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”	on	page	6
•	“Grounding	requirements”	on	page	6
•	“Safety	notices:	multilingual	translations”	on	page	7
•	“Laser	compliance	statement”	on	page	14 
						

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G50-70/G50-70m/Z50-70 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	 any	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	customer.
•	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. 
						

							3
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 wit\
h live 
electrical currents.
Many customers have rubber floor mats near their machines that contain small 
conductive fibers to decrease electrostatic discharges. 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	 operate	 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-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;	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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G50-70/G50-70m/Z50-70 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	units.)
•	If	an	electrical	accident	occurs:
–	 Caution:	do	not	become	a	victim	yourself.
–	 Switch	off	the	power.
–	 Send	the	victim	to	get	medical	aid. 
						

							5
Safety information
Safety inspection guide
The	purpose	 of	this	 inspection	 guide	is	to	 assist	 you	in	identifying	 potential	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	the 	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	not	been	removed	or	tampered	with. 
						

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G50-70/G50-70m/Z50-70 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	product.	
•	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	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.