Text preview for : LG_NB3740_AFN75854835.pdf part of LG LG NB3740 AFN75854835 LG Audio NB3740 LG_NB3740_AFN75854835.pdf



Back to : LG_NB3740_AFN75854835.pdf | Home

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




SERVICE MANUAL
320 W SMART SOUND BAR




MODEL: NB3740 (NB3740, S34A1-D)
SERVICE MANUAL
MODEL: NB3740
(NB3740, S34A1-D)

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




P/NO : AFN75854835 JANUARY, 2014
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

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

SPECIFICATIONS ............................................................................................................................................ 1-5




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
SERVICE INFORMATION FOR EEPROM
[ AUDIO MICOM OPTION CODE SETTING ]
FRONT of NB3740("-" KEY) + REMOTE CONTROL "2" (MORE THAN 5 SECONDS)
CHANGE OPTION CODE WITH THE ARROW KEY( / / / )
PRESS "ENTER" KEY AND "WRITE OK" ON FLD
FRONT of NB3740("-" KEY) + REMOTE CONTROL "2"
COMPLETED AND AUTO POWER OFF

[ MPEG SYSTEM INFORMATION DISPLAY ]
NB3740 POWER ON AND CONNECT TO TV THROUGH HDMI.
SELECT SETTINGS DISPLAY TV ASPECT RATIO 16:9 FULL
PRESS "1397139" KEY AND "ENTER" KEY
SYSTEM INFORMATION DISPLAY ON TV SCREEN
"PAUSE" KEY AND FACTORY SET COMPLETED

[ INITIAL FACTORY SET ]
NB3740 POWER ON AND CONNECT TO TV THROUGH HDMI.
SELECT SETTINGS OTHERS INITIALIZE FACTORY SET
PRESS "ENTER" KEY AND "YES" SELECT
FACTORY SET COMPLETED




1-4
SPECIFICATIONS