Service Manuals, User Guides, Schematic Diagrams or docs for : LG Audio LAS454B LG_LAS454B_AFN77441592

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Internal Use Only

SERVICE MANUAL
2.1 ch Wireless Sound Bar
SERVICE MANUAL

MODEL: LAS454B (LAS454B, S55A3-D)
MODEL: LAS454B
(LAS454B, S55A3-D)

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

P/NO : AFN77441592 SEPTEMBER, 2016
CONTENTS

SECTION 1 ........ GENERAL
SECTION 2 ........ CABINET & MAIN CHASSIS
SECTION 3 ........ ELECTRICAL
SECTION 4 ........ WIRELESS SUBWOOFER PART
SECTION 5 ........ REPLACEMENT PARTS LIST

1-1
SECTION 1
GENERAL

CONTENTS

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

WIRELESS SUBWOOFER CONNECTION....................................................................................................... 1-4

HIDDEN KEY MODE ......................................................................................................................................... 1-5

MCS / EQ PROGRAM UPDATE GUIDE ........................................................................................................... 1-6

SPECIFICATIONS ............................................................................................................................................. 1-7

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
WIRELESS SUBWOOFER CONNECTION
LED indicator of wireless subwoofer

LED Color Status
Yellow-green
The connection is trying.
(Blink)
Yellow-green The connection is completed.
The wireless subwoofer is
Red in standby mode or the
connection is failed.
Off The power cord of wireless
(No display) subwoofer is disconnected.
- The LED of the wireless subwoofer lights up
alternately in red and yellow-green.
Setting up the wireless subwoofer 4. Disconnect the power cord of the main unit and the
wireless subwoofer.
for the first time
5. Connect them again after the LED of the main unit
and the wireless subwoofer is fully turned off.
1. Connect the power cord of the wireless subwoofer
The main unit and the wireless subwoofer will be
to the outlet.
paired automatically when you turn on the main unit.
2. Turn on the main unit : The main unit and wireless
- When the connection is completed, you can see
subwoofer will be automatically connected.
the yellow-green LED on the subwoofer.

Note:
Manually pairing wireless subwoofer

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