LG lw20 Service Manual

Service Manual

(LW20)

LG Electronics

Ch 1. Service information

Ch 2. Locations

Ch 3. System information

· Specification

· Model configuration

· System Block Diagram

· Fn key combinations

· Status indicators

· BIOS Flash

· BIOS Setup

Ch 4. Symptom-to-part index

· Power system checkout

· Numeric error codes

· Error messages

· LCD-related symptoms

· Indeterminate problems

Ch 5. Removing and replacing a part (FRU)

Ch 6. Part list

· Part list

· Exploded view

Ch1. Service information

Chapter 1. Service information

1-1. Important service information

 Strategy for replacing parts (FRU-Field Replaceable Units)

Before replacing parts

Make sure that latest BIOS and drivers are installed before replacing any parts (FRUs) listed in this

Use the following strategy to prevent unnecessary expense for replacing and servicing parts

1. If you are instructed to replacing a part but the replacement does not correct the problem, reinstall the

original part before you continue.

2. Some computers have both a processor board and 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.

3. If an adapter or device consists of more than one part, any of the parts (FRUs) may be the cause of the

error. Before replacing the adapter or device, remove the parts (FRUs), one by one, to see if the

symptoms change. Replace only the part that changed the symptoms.

Caution

The BIOS configuration on the computer you are servicing may have been customized.

Running Automatic Configuration my alter the settings. Note the current configuration settings;

then, when service has been completed, verify that those settings remain in effect.

 Strategy for replacing a hard-disk drive

You have to get a User’s approval before formatting or replacing a hard-disk drive. You must let the User

know that the user is responsible for the loss data

Caution

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.

1-2. Safety notices

Warning

Before the computer is powered-on after part (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.

Warning

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

Warning

Ch1. Service information

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.

Warning

If the LCD breaks and the fluid from inside the LCD gets into your eyes or on your hands,

immediately was the affected areas with water for at least 15 minutes. Seek medical care if any

symptoms from the fluid are present after washing.

Warning

To avoid shock, do not remove the plastic cover that protects the lower part of the inverter card.

Warning

Though the main batteries have low voltage, a shorted or grounded battery can produce enough

current to burn personnel or combustible materials.

Warning

Before removing any part (FRU), turn off the computer, unplug all power cords from electrical

outlets, remove the battery pack, and then disconnect any interconnecting cables.

Ch1. Service information

1-3. Safety information

 General safety

Follow these rules to ensure general safety

· Observe good housekeeping in the area of the machines during and after maintenance.

· 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 weights more then 16kg(35lb) or object that you think are too heavy for you.

· Do not perform any action that causes hazards to the customer, or that makes the equipment unsafe.

· Before you start the machine, ensure that other service representatives and the customer’s personnel are

not in a hazardous position.

· Place removed covers and other parts in a safe place, away from all personnel, while you are servicing the

machine.

· Keep your tool box 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 a 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 a nonconductive clip, approximately

8 centimeters(3 inches) from the end.

· Do not wear jewelry, chains, metal-frame eyeglasses, or metal fasteners for you clothing.

· 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.

· 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.

Caution

Metal objects are good electrical conductors.

Ch1. Service information

 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.

· Find the room emergency power-off switch, disconnecting switch, or electrical outlet. If an 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 equipment that has hazardous voltages.

· Disconnect all power before

1. Performing a mechanical inspection

2. Working near power supplies

3. 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.

Caution

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

Caution

An electrical shock can occur only when there is a complete circuit. By observing the above rule,

you may prevent a current from through your body.

· When using testers, set the controls correctly and use the approved probe leads and accessories for that

tester

Ch1. Service information

· 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.

· 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 that it has been powered off.

· Always look carefully for possible hazards in your work area. Examples of these hazards are moist floors,

non-grounded 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.

1. Power supply units

2. Pumps

3. Blowers and fans

4. Motorgenerators

and similar units. (This practice ensure correct grounding of the units.)

· If an electrical accident occurs

1. Use caution ; do not become a victim of yourself.

2. Switch off power.

3. Send another person to get medical aid.

Ch1. Service 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-LG 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

1. Electrical hazards, especially primary power (primary voltage on the frame can cause serious or fatal

electrical shock)

2. Mechanical hazards, such as loose or missing hardware

Refer to the following checklist and 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 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.

4. Remove the cover.

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

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.

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

Ch1. Service information

 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.

Note

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

Make sure that the ESD protective devices you use have been certified (ISO9000) as fully effective.

· When handling ESD-sensitive parts :

1. Keep the parts in protective packages until they are inserted into the product.

2. Wear a grounded wrist strap against your skin to eliminate static on your body.

3. Prevent the part from touching your clothing. Most clothing retains a charge even when you are wearing

a wrist strap.

4. 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.

5. 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.

a. Attach the ESD ground clip too any frame ground, ground braid, or green-wire ground.

b. Use an ESD 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.

c. Use the round ground-prong of the AC plug on AC-operated computers.

 Grounding requirements

Electrical grounding of the computers is required for operator safety and correct system function.

Proper grounding of the electrical outlet can be verified by a certified electrician.

Ch1. Service information

1-4. Laser compliance statement

When a CD-ROM drive, DVD drive or the other laser product is installed, note the following :

Caution

Use of controls or adjustments or performance of procedures other than those specified here in

might result in hazardous radiation exposure.

Opening the CD-ROM drive, DVD-ROM drive or the other optical storage device could result in exposure

to hazardous laser radiation.

There are no serviceable parts inside those drives. Do not open

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 bean.

1-5. Backup (Standby) RTC battery safety information

When replacing or disposing of the backup (standby) RTC battery, note the following :

Ch1. Service information

1-6. Read this first

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

Important Notes

· Only trained personnel certified by LG should service the computer.

· Read the entire FRU removal and replacement page before replacing any FRU.

· Use new nylon-coated screws when you replace FRUs.

· Be extremely careful during such write operations as copying, saving, formatting.

Drives in the computer that you are servicing sequence might have been altered. If you selected an

incorrect drive, data or programs might be overwritten.

· Replace FRUs only for the correct mode.

· 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.

· A FRU should not be replaced because of a single, irreproducible failure. Single failures can occur for a

variety of reasons that have nothing to do with a hard ware 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.

· Be careful not to replace a non-defective FRU.

 What to do first

You must fill out the record form first.

During the warranty period, the customer may be 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 computer, determine whether the damage is covered under the

warranty by referring to the following :

Ch1. Service information

The followings are not covered under warranty :

· CD panel cracked from the application of excessive force or from being dropped

· Scratched (cosmetic) parts

· Distortion, deformation, or discoloration of the cosmetic parts

· Cracked or broken plastic parts, broken latches, broken pins, or broken connectors caused by excessive

force

· Damage caused by liquid spilled into system

· Damage caused by improper insertion of a PC Card or the installation of an incompatible card

· Damage caused foreign material in the diskette drive

· Diskette drive damage caused by pressure on the diskette drive cover or by the insertion of a diskette

with multiple labels

· Damaged or bent diskette eject button

· Fusses blown by attachment of a non-supported device

· Forgotten computer password (making the computer unusable)

· Sticky keys caused by spilling a liquid onto the keyboard

The following symptoms might indicate damage caused by non-warranted activities :

· Missing parts might be a symptom of unauthorized service or modification.

· If the spindle of a hard-disk drive becomes noisy, it may have been subjected to excessive force, or

dropped.

Chapter 2. Locations

 Front view

SRS Button

MUTE Button

Volume Up

Volume Down

Power Button

Ch2. Locations

LCD

Keyboard

Internal MIC

 Rear view

Security key hole

USB Connector

Security key hole (Kensington Lock)

Internal Speaker

5-in-1 Card Slot

Touchpad

Touchpad Button

Internal Speaker

S-VIDEO Connector

User can attach a separately purchased chain lock into the security keyhole and connect it to a fixed object

to prevent a notebook theft

Ch2. Locations

 Left view

VGA Connector

Fan Louver

Line-in Connector / SPDIF Connector

IEEE 1394 Connector

USB Connector

Headphone Connector

MIC Connector

 Right view

Emergency eject hole

Optical Disk Drive

ODD Open Button

Emergency eject hole

Insert a thin and hard pin into this hole, and you can open the disc tray manually.

Modem Connector

ODD Eject Button

LAN Connector

AC Connector

Ch3. System information

Chapter 3. System information

 Specification

-CPU

· Dothan 1.6 ~ 2.1 GHz

· μFCPGA

- Main Chipset & Graphic

· Intel 915GM,ICH6-M

- Memory

· 2SODIMM – Up to 2GB

· DDR2 PC2-3200S/4200S Capable (400/533MHz)

- HDD

· 1.8" 5mm/8mm 30/40/60GB PATA Type

- Communication

·MDC

· Modem, Daughter Card Type

· Marvell Yukon 88E8053 PCI-E Gigabit Ethernet Controller

· Marvell Yukon 88E8036 PCI-E 10/100 Ethernet Controller

- Wireless LAN Solution

· 802.11bg/abg Mini PCI Type, Hexa-band Antenna

- Card Slot

· Express Card Slot

· 5-in-I Card Slot (XD Picture, Memory Stick, Memory Stick Pro, Multi Media Card, SD Card)

-ODD

· Removable Optical Storage

· DVD, DVD-COMBO, DVD Super Multi

· Optional DMB Support

-Port

· VGA, 3X USB(2.0), RJ11, RJ45, Headphone, Line-in/SPDIF, Mic-in, AC-in, IEEE1394, S-Video

- Input Devices

· Keyboard : 86Key Keyboard

· Touchpad

- Buttons

· Power, Volume Down, Volume Up, Mute, SRS

- Indicator (LED)

· Power On, Charge, HDD, Caps Lock, Num Lock, Wireless

- Power

· 65 Watt 18.5V 3.5A Adapter

-Audio

· Realtek Azalia Audio Codec ALC880, Stereo speakers

-Battery

· 6 Cell 4.8AHr, CYLINDRICAL (Li-Ion)

 System Block Diagram

Ch3. System information

LEDs

Wireless

page 5

FAN CONN

page 5

3.3V

THERMAL

SENSOR

page 2 - 4

VCCP

CPU_CORE

DOTHAN(NV)

HDD

CAPS LOCK

FSB 533MHz

NUM LOCK

page18

LCD CONN

3.3V

VCCP

ALVISO-GM

CHG

ACIN

PWR ON

page19

page09

CRT CONN

S-VIDEO CONN

3.3V

TV/CRT/LVDS

page 6-12

GMCH_CORE (1.05V)

SUB BOARD

HDD

SATA TO PATA

SATA

DMI

page28

page27

BAY CONN.

PATA 66/100

ICH6-M

page38

SUB BOARD

page33

AD18

MINI PCI CONN

3.3V

PIRQC/D

PCIREQ/GNT3

page28

PCI 3.3V,33MHz

page21-26

NEWCARD

3.3V

page34-36

AD16

PCI7411

3.3V

PIRQA,SERIRQ

PCIREQ/GNT0

1394

PORT

SUB B/D

USB2

USB0/1

USB2

USB0/1

USB Interface

LPC 3.3V, 33MHz

page29

page27

USB3

H8S2110B

4 IN 1

SUB B/D

USB5

USB0

page28

USB6

page45

INT. KBD

page39

3.3v

USB5

page28

USB7

SUB B/D

POWER S/W

page40

SUB BD

VOLUME S/W

SUB BOARD

SUB BD

TOUCH PAD

WIND RIVER

DDR2 400/533 MHz

page20

DDR2

page46

DDR2 DC/DC

SODIMM-0 /1

page48

SYSTEM DC/DC

5V/3.3V

CK-410M

page45

CPU CORE VCC

V1.2S / V1.5A

CK-SSCD

page

VCCP

GMCH_CORE

page47

page13-15

AC’97 / AZALIA

1.8V

page44

page42

Miscellaneous

BATTERY CHARGER

SUB BOARD

DIGITAL(3.3V)

page37

SUB BD

ALC880

AUDIO

CODEC

AMP

SUB BD

HP/SPDIF

page44

Power rail & Battery Conn.

ANALOGVCC(5V)

MDC MODEM

MIC

SUB BD

PCI EXPRESS

PORT 1

page30

GbE

10/100

88E8052

88E8036

3.3V

1.0V

1.8V

3.3V

page31

page30

EEPROM

Magnetic

page31

RJ45/RJ11

SUB BOARD

FWH

PORT 3

NEWCARD

SST49LF008A

SUB B/D

3.3V

1.5V

SUB B/D

3.3V

Ch3. System information

 Fn key combinations

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

Function of Fn keys has nothing to do with Operating System.

[Fn] + [F1]

[Fn] + [F2]

[Fn] + [F3]

[Fn] + [F4]

[Fn] + [F5]

[Fn] + [F6]

[Fn] + [F7]

[Fn] + [F8]

User defined Hot key. (available from OSD Setting)

Forces the computer to enter power-saving mode. (ex: system standby and hibernation)

Press the combination once to disable the touch pad, and press again to enable the touch pad. (The touch pad initialization takes 1~2 seconds, so wait for the initialization to end before using the touch pad)

Wireless LAN Enable/Disable Toggle.

Monitor toggle. When the computer is attached to an external monitor, you can change the display output location with [Fn] + [F7] combination. You can switch to and from the three types of display modes, LCD display only, the external monitor only, or both at the same time.

Audio Enable/disable

•Refer to Battery Miser 2005 Help.

[Fn] + [F9]

[Fn] + [F10]

[Fn] + [F11]

[Fn] + [F12]

[Fn] + Home

[Fn] + End

[Fn] + Scr Lk

[Num Lk]

[Fn] + [Delete]

Fn + PgUp (Prt

Sc Sys Rq)

Fn + PgDn

(Pause Break)

LCD Auto Brightness control Enable/Disable. Enable/disable Auto Brightness control. (ON/OFF)

•Refer to Battery Miser 2005 Help.

System information.

CPU Cooling Fan control mode (Normal / Slow / Fast).

Maximum power-saving mode. (When OSD is installed.)

Darken the LCD (8 Steps).

Brighten the LCD (8 Steps).

Num Lock

Insert

Print Screen

Pause

Ch3. System information

 Status indicators

The system status indicators show the status of the computer

1. 2. 3. 4. 5. 6.

1. Num lock

Num lock indicator lights up when Num lock key is pressed.

By pressing Fn + Scr LK (Num LK) key, you can use the embedded numeric keys.

To disable the embedded numeric keys, press Fn + Scr LK (Num LK) key again.

- The Num Lock indicator is off while an external keyboard is connected if OSD keyboard setup is

configured not to use embedded keypad with an external keyboard connection.

2. Caps lock

Caps lock indicator lights up when the Caps lock key is pressed.

When this indicator lights up, you can type capital letters without pressing the Shift key.

3. Drive in use

Drive in use indicator lights up when data is being written to or read from the hard disk or optical disk

drive.

- Do not turn off the power when Drive in use indicator is on.

It may result in loss of data in the hard disk.

4. Wireless activity indicator

Off: Wireless LAN is not in use.

Blinking(3-4 Seconds): Searching for Access point for Wireless LAN Connection.

Blinking (short interval): Data is transferring with Wireless LAN is on.

5. Power

Power status indicator indicates the following status of the computer.

Off: The computer is turned off or is in hibernation mode.

On: The computer is turned on.

Blinking: The computer is in standby mode.

6. Battery status indicator

Orange light: Battery is being charged.

Orange light/ Blinking (Green): Battery is being charged - battery is remaining more than 90% of its

maximum capacity.

Off: Battery is being discharged.

Green: Battery is fully charged or empty while the AC adapter is connected.

Blinking (Green): Battery is remaining less than 10%, or being discharged.

Blinking (Red): A battery error occurs.

- The Battery indicator blinks as you have set the alarm action from the Battery miser 2005.

Ch3. System information

 BIOS Flash

You can update BIOS using a floppy disk drive.

Because this system is not equipped with any floppy disk drive, you have to use an external USB drive for

a BIOS update. In order to boot up with an USB drive, please set Removable Device as the first boot up

drive in the boot menu of BIOS setup.

· How to update flash ROM in DOS

1. Create ‘boot up’ flash update diskette.

2. Copy a ROM image file (*.wph) into the root of the flash update diskette.

3. Copy phlash16.exe to the flash update diskette.

4. Insert the diskette into the FDD of your computer.

5. Boot your computer with the diskette, and type ‘phlash16*.wph /mode=n’.

6. Cold boot and follow the instruction displayed on the screen.

· Flash options /mode=n

0 – Default mode. Keep the current DMI information and update BIOS image only.

1 – Update DMI information only.

If new DMI information is not specified, the current DMI information is left unchanged.

2 – Update BIOS and DMI information.

If new DMI information is not specified, the current DMI information is left unchanged.

3 – Update BIOS and DMI information.

DMI information is updated to the DMI string and options specified in the new BIOS image.

Note

DMI is Desktop Management Interface

Ch3. System information

 BIOS Setup

BIOS (Basic Input and Output System) Setup saves the system configuration in CMOS RAM, and

check the configurations during startup. Use the BIOS Setup Utility to change and save the system

environment, hardware configurations, power saving mode, etc.

· Open the BIOS Setup Utility in the following situations :

1. to change the BIOS setup

2. to replace the backup battery

3. system configuration error occurs

4. to change the boot order

5. to set/change a password

Press the power button.

When the LG logo appears on the screen, press and enter the BIOS Setup Utility.

Ch3. System information

 Using the keys

The keys used in the BIOS Setup Utility and their functions are described at the bottom.

· , + : General Help

Display the descriptions of the keys used in the setup utility.

· , : Select Item

Navigate and select items in the setup utility. The selected item becomes highlighted.

· , : Select Menu

Move to another menu.

· / , : Change Values

Change the value of a selected item.

· : Load Default Configuration

Display Setup Confirmation window. Press Enter to load default configuration.

· : Select Sub-Menu

Some items have sub-menus. Display the sub-menu for a selected item.

· : Save and Exit

Display Setup Confirmation window. Press Enter to save and exit.

·: Exit

In a sub-menu, press Esc to move to the previous window. In Main menu, click Esc to move to Exit menu.

Ch3. System information

 Main menu

System Time

Current time. Use <Tab>, <Shift-Tab>, or <Enter> keys to move around these fields. To change the value, press <+> or <−> key.

System Date

Today date. Use <Tab>, <Shift-Tab>, or <Enter> keys to move around these fields. To change the value, press <+> or <−> key. Set any date from year 1981 to 2079. It will automatically keep track of leap years. The system date can also be set from the operating system.

Product Name

This shows the name of PC.

Processor Type

This shows the type of CPU.

Processor Spd

This shows the speed CPU.

BIOS Version

This shows the Version of BIOS.

KBC Version

This shows the Version of KBD firm ware.

UUID

This is for display only. This shows the UUID.

Pri Master

Enter its submenu by pressing <Enter>. In this submenu, it would show the device of Primary IDE Master is HDD and its parameters.

Sec Slave

Enter its submenu by pressing <Enter>. In this submenu, it would show the device of Secondary IDE Slave is optical drive and its parameters.

Total Memory

This is for display only. This shows size of system memory.

Ch3. System information

 Advanced menu

Legacy USB Support

There are two options to this field: Enabled, and Disabled. This field allows you to enable or disable the legacy USB support.

Boot-time Diagnostic Screen

Enables the Boot-time Diagnostic Screen.

SATA Controller Mode

Set SATA (Serial ATA) Controller Mode.

AHCI Configuration

Enables the AHCI (Advanced Host Controller Interface).

Battery Charge Stop Percentage

Set Battery Charge Stop Percentage.

Fan Mode Control

Set Fan Mode Control.

Fn Key Setup

Set Sticky fn key function.

Wake On Lan

Enables Wake On Lan.

PXE/Remote Boot

Enables PXE/Remote Boot.

Execute-Disable Bit Capability

Enables Execute-Disable Bit Capability.

 Security menu

Supervisor Password Is

This shows the system’s supervisor password has been set, or not.

Set Supervisor Password

Set Supervisor Password.

User Password Is

This shows the system’s User Password has been set, or not.

Set User Password

Set User Password.

Password on boot

Enables Password on boot.

HDD Password Is

This shows the system’s HDD Password has been set, or not.

Set HDD Password

Set HDD Password.

Ch3. System information

 Boot menu

Boot menu enables you to set the boot order for the CD-ROM drive, Removable devices Hard drive, and Network boot as shown below.

CD-ROM Drive

Removable Devices

Hard Drive

B2 D0 Yukon PXE

 Exit menu

Exit Saving Changes

Select Exit Saving Changes to save new setup information in CMOS RAM. CMOS RAM stores the information using the backup battery; therefore, the information will not be lost when the computer is turned off.

Exit Discarding Changes

Select Exit Discarding Changes to discard new setup information. If you made changes to items other than date, time, and passwords, the Setup Warning asks you to save the new configurations. Select Yes and press Enter to save the new configuration.

Load Setup Defaults

Select Load Setup Defaults to change the setup information to the factory default settings. If you select Load Setup Defaults or press F9, Setup Confirmation asks you to confirm your selection. Press Yes to load setup defaults.

Discard Changes

Discard change value.

Save Changes

Save change value.

Ch4. Symptom-to-part index

Chapter 4. Symptom-to-part index

The symptom-to-part index in this section lists symptoms and errors and their possible causes.

The most likely cause is listed first.

Note

If replacing a part (FRU) does not solve the problem, put the original part back in the computer.

Do not replace a non-defective FRU.

 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.

· If you suspect a power problem, see the appropriate one of the following power supply checkouts :

1. Checking the AC adapter

2. Checking the operational charging

3. Checking the battery pack

4. Checking the backup battery

Ch4. Symptom-to-part index

· Checking the AC adapter

If the power-on indicator does not turn on, check the power cord of the AC adapter for correct continuity

and installation.

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:

Voltage (V dc)Pin

3. If the measured output voltage is incorrect, remove

the power cord from the AC adapter and then re-

connect it in about ten seconds.

4. Measure the output voltage at the plug of the AC adapter cable.

5. If the measured output voltage is incorrect, replace the AC adapter.

+18.0 ~ +19.21

Ground2

Ch4. Symptom-to-part index

· If the voltage is not correct, replace the AC adapter.

· If the voltage is acceptable, do the following :

1. Replace the system board.

2. If the problem persists, check the AC adapter whether it is correct product or not.

Note

Noise from the AC adapter does not always indicate a defect.

· Checking operational charging

1. 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

does not turn on, replace the battery pack.

2. If the charge indicator still does not turn on, replace the system board.

Then reinstall the battery pack.

Note

Do not charge battery pack, when its temperature is below 0 or above 75 .

· Checking the battery pack

1. Open the Power Meter window by clicking Start Control Panel Power Options and then;

check the total power remains. 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.

2. To check the status of your batter, 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.

+ 60 hidden pages

LG lw20 Service Manual

Service Manual

Contents

Chapter 1. Service information

Chapter 2. Locations

Chapter 3. System information

Chapter 4. Symptom-to-part index