Service Manuals, User Guides, Schematic Diagrams or docs for : LG Audio SH2 LG_SH2_AFN77457385
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Internal Use Only
SERVICE MANUAL
2.1 ch Sound Bar
SERVICE MANUAL
MODEL: SH2 (SH2, SPH2B-P)
MODEL: SH2
(SH2, SPH2B-P)
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
P/NO : AFN77457385 MARCH, 2016
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
FIRMWARE UPDATE ........................................................................................................................................ 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
ENTRANCE EXIT
HIDDEN MODE DISPLAY RESULT
KEY KEY
SW version will be output by voice through Speaker
with below order.
You can select each version by Volume +/- key.
1) DSP
2) CHECKSUM
Front `Vol(-)' +
Remote control 3) Touch IC
Version Remote control
`STANDARD', NA 4) EQ
Check `STANDARD'
POWER OFF
for 3 seconds.
ex)
1) D1512222
2) 4A3B
3) T1507081
4) E1511261
Front `Vol(-)' +
Remote control
USB SW Remote control Turn on all of During SW update, 4 white LED will turn on
`F' (Function),
update `Vol(+)' 4 white LED one by one and circularly.
POWER OFF
for 3 seconds.
1-4
FIRMWARE UPDATE
1. To update the Firmware
1) Copy the firmware upgrade file to a empty USB
device. Make sure the USB device is empty before
transferring the firmware upgrade file.
5) Complete the firmware update. When the update is
successfully completed, the unit goes into the standby
mode after the automatic reset. When the unit goes
into the standby mode, the red LED lamp will be on.
2) Hold the Volume(+) key on the remote control unit (Will take about 2 minutes)
for 3 seconds, while pushing the Volume(-) button on
the main unit. Then, the mode will be changed to the
USB update mode. (see 3). (Do not need to change
the input function on the main unit)
2. Urgent Firmware update description
If the function LED lamps are sequentially lighting for
3) When the USB upgrade mode is ready, all the 4 more than 3 minutes, unplug the power. After waiting
function LED lamps will be on. all the lamps go off, plug the power again, and then,
the Urgent firmware update function will automatically
restart the update. After the process will be the same
with 4 above. (The USB device should be remained
on the USB port)
3. How to check the firmware version
If the main unit is on the stand-by mode, put the pow-
er on with the power button. Hold the "standard" key
on the remote controller for 3 seconds while holding
the Volume(-) button on the main unit. Then, the main
unit mode will be changed into the version-check
4) Plug the USB device into the USB port on the mode, and can listen the current version information.
back side of the main unit. The update process will The new firmware version is "201512222." If the
be started automatically. (The unit will automatically firmware version was updated, the main unit will say
reads the file from the USB device) The progress will D1512222. (20 is omitted, and the letter "D", meaning
be displayed sequentially on 4 LED lamps on the of DSP firmware) Push the "Standard" key once more
main unit. (See the picture of 3) when escaping from the version-check mode.
1-5
SPECIFICATIONS
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