lw20(1).pdf

Service Manual

(LW20)

LG Electronics

Contents

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.

Ch1. Service information

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

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.

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