Service Manuals, User Guides, Schematic Diagrams or docs for : LG Audio NB2420A LG_NB2420A_AFN75734048
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Internal Use Only
Website http://biz.lgservice.com
SERVICE MANUAL
160W Sound Bar System
MODEL: NB2420A
SERVICE MANUAL
MODEL: NB2420A
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
P/NO : AFN75734048 FEBRUARY, 2012
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
MICOM HIDDEN KEY MODE ......................................................................................................................... 1-4
UPDATE PROGRAM ....................................................................................................................................... 1-5
SERVICE INFORMATION FOR EEPROM .................................................................................................... 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
MICOM HIDDEN KEY MODE
HIDDEN MODE ENTRANCE KEY EXIT KEY DISPLAY RESULT
1) Micom,
2) ESS,
3) Touch Key
M 1009303
4) wireless SPK
E 1106151
module TX,RX Ver
Front Stop + RMC T 1106301
Version Check POWER OFF ex) TX35RX35
Play for 5s TX35RX35
5) wireless SPK
R 1007130
Micom Ver
01 E1 00 30 11
ex) W 1007130
6) EEPROM option
value (on Scroll)
Front Stop + RMC '0'
EEPROM INITIAL auto exit "E2P CLEAR" EEPROM initializing
for 5s
Front Stop + RMC '2'
EEPROM EDIT Toggling OP0-10 Edit Micom option
for 5s
Wireless spk Front Stop + RMC Connecting Wireless
Toggling "REMATE:"
remate mute spk to main set
Front Stop + RMC '8'
Clip Off Toggling "CLIP OFF" To Test (output etc.)
for 5s
Monitoring
Front Stop + RMC '8' Monitoring Changed
Changed Gain Toggling -0,0 dB
for 5s Gain at Clip ON
at Clip ON
Front Stop + RMC For Max Volume
MAX Volue Edit Toggling MVOL-XX
'Sleep' for 5s setting (1 ~ 40)
OPTIONAL PART (WITH WIRELESS SPK)
1-4
UPDATE PROGRAM
1) File Name OPTIONAL PART
Model Name NB3520
Micom Update Filename MICOM_NB3520.HEX
ESS Update Filename DSP_NB3520.ROM
Wireless Rx/Tx Module Update Filename WIRELESS.BIN
Wireless Rx Micom Update Filename WIRELESS_MICOM.HEX
Touch Key Filename TOUCH1_NB3520.DLD
2) File Name is in uppercase letters only.
3) PROGRAM DOWNLOAD
1. AUDIO MICOM
BOOTING FUNCTION DISPLAY USB FUNCTION CONNECTING THE USB
"MICOM UP" DISPLAY AFTER UPDATE , THE SET POWER OFF AUTOMATELY.
2. DSP
BOOTING FUNCTION DISPLAY USB FUNCTION CONNECTING THE USB "DSP UP" DISPLAY
AFTER UPDATE , THE SET POWER OFF AUTOMATELY.
3. TOUCH
BOOTING FUNCTION DISPLAY USB FUNCTION CONNECTING THE USB
"T-UP 00" ~ "T-UP 90" DISPLAY AFTER UPDATE , THE SET POWER OFF AUTOMATELY.
SERVICE INFORMATION FOR EEPROM
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