Lenovo A5500h Service Manual

							
Lenovo A5500
Hardware 
Maintenance
Manual 
						

							Note:
Before using this information and the product it supports, be sure to read the general information 
under “Notices” on page 48.
First Edition (January 2014)
© Copyright Lenovo 2014. All rights reserved.
LENOVO products, data, computer software, and services have been developed exclusively at private 
expense and are sold to governmental entities as commercial items as defined by 48 C.F.R. 2.101 with 
limited and restricted rights to use, reproduction and disclosure.
LIMITED AND RESTRICTED RIGHTS NOTICE: If products, data, computer software, or services are 
delivered pursuant a General Services Administration “GSA” contract, use, reproduction, or disclo-
sure is subject to restrictions set forth in Contract No. GS-35F-05925.
© 2014 Lenovo 
						

							iii
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 ............................. 16
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 Charger .......................... 21
Checking the internal battery status......... 21
Related service information ....................... 23
Security ............................................................... 23
Power management .......................................... 23
Activating/Deactivating the Display ....... 23
Lenovo A5500 .............................................. 24
Specifications ..................................................... 24
FRU replacement notices.................................. 26
Screw notices................................................ 26
Removing and replacing an FRU .................... 27
1010 Side door .............................................. 28
1020 Micro SD card and Micro SIM 
card ................................................................ 29
1030 Back cover............................................ 31
1040 Power key and volume key .............. 33
1050 ANT carrier ......................................... 34
1060 Battery pack......................................... 35
1070 System board....................................... 37
Locations ............................................................. 44
Parts list .............................................................. 45
Overall........................................................... 46
Screws ........................................................... 47
Notices ......................................................... 48
Trademarks ........................................................ 49
Contents 
						

							iv
This manual contains service and reference information for the following 
Lenovo product:
Lenovo A5500
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.
About this manual
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. 
						

							Safety information
1
This chapter presents the following safety information that you need to get 
familiar with before you service a Lenovo 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
Safety information 
						

							Lenovo A5500 Hardware Maintenance Manual
2
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.
Place removed covers and other parts in a safe place, keeping them away 
from all personnel, while you are servicing the machine.
Keep your tool case away from walk areas so that other people will not trip it 
over.
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.
General safety 
						

							Safety information
3
Observe the following rules when working on electrical equipments.
Find the room emergency power-off (EPO) switch, disconnecting the 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.
Electrical safety
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 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. 
						

							Lenovo A5500 Hardware Maintenance Manual
4
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. 
						

							Safety information
5
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.
Safety inspection guide 
						

							Lenovo A5500 Hardware Maintenance Manual
6
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.
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.
– 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.
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.
Handling devices that are sensitive to electrostatic discharge
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.
Notes:
The use of a grounding system to guard against ESD damage is desirable but 
not necessary.
Grounding requirements