LG LM40 User manual

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Service Manual
(LM40/50)
LG Electronics

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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
Contents

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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
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.
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.
Ch1. Service information

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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
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

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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

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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

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· 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

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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

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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.
Ch1. Service information
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.

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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.
1-4. Laser compliance statement
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 :
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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 :
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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.
Ch1. Service information

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LCD
Power switch
Volume Down
Keyboard
TouchPad TouchPad button
Built-in speakers
Volume Up
Front view (15”)
Chapter 2. Locations
Ch2. Locations
Power-saving mode switch
IrDA port
LCD
Power switch
Volume Down
Keyboard
TouchPad TouchPad button
Built-in speakers
Volume Up
Front view (14.1”)
Power-saving mode switch
IrDA port

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PC card eject button USB port
ODD
ODD tray open button
IEEE1394 port
SD memory Card slot
Microphone jack
Key hole (Kensington Lock)
Ch2. Locations
Right view (15”/14.1”)
Security key hole (Kensington Lock)
User can attach a separately purchased chain lock into the security keyhole and connect it to a fixed object
to prevent a notebook theft
S-Video Modem port
Power jackEthernet port
Emergency eject hole
USB port
Headphone jack / S-PDIF
VGA portParallel portFan louvers
PC card slot
Rear view (15”/14.1”)
Left view (15”/14.1”)

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Specification
•CPU
· Banias 1.3 ~ 1.7 GHz / Dothan 1.7 GHz
·FCPGA
• Main Chipset & Graphic
· Intel ODEM + ICH4
· Intel Montara GME (Graphic Controller Integrated)
· ATi M9+ w/32MB VRAM
· ATi M10 w/64MB VRAM
• Memory
· 2SODIMM – Up to 2GB
· DDR200/266/333 Capable
• HDD
· 2.5” 9.5mm 40/60/80GB
• Communication
· Modem, Daughter Card Type
· 10/100 LAN on Board
·IrDA
• Wireless LAN Solution
· 802.11b Mini PCI Type, Quad-band Antenna
• Cardbus
· 1 Type II Cardbus Socket
·SDCardSlot
· Memory Stick Slot
•ODD
· Fixed Optical Storage
· DVD/COMBO
•Port
· VGA, PIO, 2X USB(2.0), 1X USB(1.1) RJ11, RJ45, Headphone-out / S-PDIF, Mic-in, DC-in, IEEE1394
• Input Devices
· Keyboard (Full sized Keyboard, 2.5mm Key Storke)
· Touchpad
· 3 Buttons (Power, Volume Up, Volume Down)
• Indicator (LED)
· Power, HDD Activity, Caps Lock, Num Lock, Wireless LAN, Battery Charge, AC
•Power
· 65 Watt 18.5V Adapter
•Audio
· 2 Pro Speakers w / 16bit Stereo (SB Pro Compatible) 1W
•Material
· McKinley CFRTP / Rear (Mg)
•Battery
· 6 Cell 4.4Ah Cylindrical (Li-Ion)
· 9 Cell 6.6Ah Cylindrical (Li-Ion)
Chapter 3. System information
Ch3. System information

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Model Configuration
Ch3. System information

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System Block Diagram
Ch3. System information

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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.
User-defined Hot key. (Setting is available at OSD)
Enable / Disable Wireless LAN.
Disable Wireless LAN by pressing once.
Enable Wireless LAN by pressing once more.
The computer display becomes less bright.
The computer display becomes brighter.
User-defined Hot key. (Setting is available at OSD)
User-defined Hot key. (Setting is available at OSD)
Enable Disable the auto brightness control function with the Battery Miser if it is installed.
(To enable this function, you have to install the Battery Miser first.)
Enable / Disable the auto sound control function with the Battery Miser if it is installed.
(To enable this function, you have to install the Battery Miser first.)
Switch between the computer display and an external monitor. If an external monitor is
attached, computer output is displayed in the following three patterns by turns:
External monitor (CRT display)
Computer display and external monitor (LCD + CRT display)
Computer display (LCD)
Enable / Disable TouchPad.
Disable TouchPad by pressing once.
Enable TouchPad by pressing once more.
Put the computer in standby mode.
To turn the LCD display on again, press any key or TouchPad.
(In Windows XP and Windows 2000, this combination of buttons functions as a sleep button.
The setting can be changed so that pressing it puts the computer into hibernation mode or
even shuts the computer down.)
User-defined Hot key. (Setting is available at OSD)
User-defined Hot key. (Setting is available at OSD)
User-defined Hot key. (Setting is available at OSD)
Description+
Ch3. System information

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Status indicators
· The system status indicators show the status of the computer.
d. 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.
f. 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 key.
Ch3. System information
de f g
ad b e fc a
a. AC Power
Power indicator lights up when the power cord is connected to the computer.
e. Num Lock
Num Lock indicator lights up when the combination of the and key is pressed.
When this indicator lights up, you can use the embedded numeric keys.
(To use the numeric keys, you must enable the Internal Keypad setting under the Advanced menu in
the BIOS Setup Utility)
g. Wireless activity indicator
Wireless activity indicator indicates the following.
Blue : The Wireless client is associated with the network.
Off : The Wireless card does not have the power or RF is off.
Blinking : The Wireless client is not associated with the network.
c. Power
Power status indicator indicates the following status of the computer.
Green : The computer is turned on.
Off : The computer is turned off or is in hibernation mode.
Blinking : The computer is in standby mode.
b. Battery
Battery status indicator indicates the following status of the battery.
Green : The computer is connected to an AC adapter and is being charged.
Off : The battery if fully charged OR the computer is not connected to an AC adapter.
Blinking : The battery power is under 10% of its maximum capacity.
14.1” 15”

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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