Service Manuals, User Guides, Schematic Diagrams or docs for : LG Audio LAS350B lg_las350b[X]

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Internal Use Only
Website http://biz.lgservice.com

SERVICE MANUAL
Sound Bar
SERVICE MANUAL

MODEL: LAS350B (LAS350B, S35A1-W)
MODEL: LAS350B
(LAS350B, S35A1-W)

CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.

P/NO : AFN77277006 JULY, 2015
CONTENTS

SECTION 1 ........ GENERAL
SECTION 2 ........ CABINET & MAIN CHASSIS
SECTION 3 ........ ELECTRICAL
SECTION 4 ........ REPLACEMENT PARTS LIST

1-1
SECTION 1
GENERAL

CONTENTS

ESD PRECAUTIONS ......................................................................................................................................... 1-3

HIDDEN KEY MODE ......................................................................................................................................... 1-4

SERVICE INFORMATION FOR EEPROM ........................................................................................................ 1-4

MCS / EQ HIDDEN KEY GUIDE ....................................................................................................................... 1-5

MCS / EQ PROGRAM UPDATE GUIDE ........................................................................................................... 1-5

SPECIFICATIONS ............................................................................................................................................. 1-6

1-2
ESD PRECAUTIONS
Electrostatically Sensitive Devices (ESD)
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components
commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated
circuits and some field-effect transistors and semiconductor chip components. The following techniques should
be used to help reduce the incidence of component damage caused by static electricity.
1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off
any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a
commercially available discharging wrist strap device, which should be removed for potential shock reasons
prior to applying power to the unit under test.
2. After removing an electrical assembly equipped with ESD devices, place the assembly on a conductive surface
such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ESD devices.
4. Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static" can
generate electrical charges sufficient to damage ESD devices.
5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESD
devices.
6. Do not remove a replacement ESD device from its protective package until immediately before you are
ready to install it. (Most replacement ESD devices are packaged with leads electrically shorted together by
conductive foam, aluminum foil or comparable conductive materials).
7. Immediately before removing the protective material from the leads of a replacement ESD device, touch the
protective material to the chassis or circuit assembly into which the device will by installed.

CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT, AND OBSERVE ALL OTHER
SAFETY PRECAUTIONS.

8. Minimize bodily motions when handing unpackaged replacement ESD devices. (Otherwise harmless motion
such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate
static electricity sufficient to damage an ESD device).

CAUTION. GRAPHIC SYMBOLS

THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS
INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED
"DANGEROUS VOLTAGE" THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF
ELECTRIC SHOCK.

THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE
SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE
LITERATURE.

1-3
HIDDEN KEY MODE
HIDDEN MODE KEYS
USB MODE ENTRY/UPDATE Main set `-' (Volume) + Remote control `MUTE'
EEPROM EDIT Main set `-' (Volume) + Remote control `OPTICAL'
EEPROM CLEAR (Initialize) Main set `-' (Volume) + Remote control `Treble/Bass'
VERSION CHECK Main set `-' (Volume) + Remote control `LG TV'
up Sound Effect
down NIGHT
right F.Skip (Right)
left B.Skip (Left)
enter AV Sync

SERVICE INFORMATION FOR EEPROM

POWER ON

OPT Status

Main set `-' (Volume) + Remote control `OPTICAL'

VFD " OPT.."

Use arrow key [Sound Effect, NIGHT, F.Skip (Right), B.Skip (Left)] to move to appropriate position and make changes

Remote control `AV SYNC'

Display VFD "E2P CLR"

Power off automatically

Power cord unplug

1-4
MCS / EQ HIDDEN KEY GUIDE
1. Version & Option Check
1) Power on.
2) Press main set "-" (volume -) key and remote control "LG TV" key during 3 seconds.
3) Check MCS version.
Ex) P1412120
4) Press remote control "F.Skip (Right)" 1 time.
Check EQ version.
Ex) Q1412020
5) Press remote control "F.Skip (Right)" 1 time.
Check option.
Ex) 10010000

2. Initialize
1) Power on.
2) Press main set "-" (volume -) key and remote control "Treble/Bass" during 3 seconds.
3) Display VFD "E2P CLR".
4) Power off automatically.
5) Power cord unplug.

MCS / EQ PROGRAM UPDATE GUIDE
1. Preparation
- Remote control.
- Do format USB Memory to FAT32 File system.
- USB : Update file exist only in the USB Memory stick.
Ex ) LAS350B :
MCS E:LAS350B_FW_201412221.bin (if USB driver is E:)
EQ E:EQ_PRG_LAS350B_141219_0_4112.bin (if USB driver is E:)

2. Update
1) Power on.
2) Change the USB function. [Main set `-' (Volume) + Remote control `MUTE']
3) Insert USB.
4) Display in VFD.
MCS : "MCS UP" "FINISH" Power off.
EQ : "EQ UP" "FINISH" Power off.
5) Loading is shown while updating.
Never remove USB or AC cord.
6) After update finish, show FINISH in VFD and power of automatically.
7) Power cord un-plug.

1-5
SPECIFICATIONS

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