LG SH7 Service manual
SERVICE MANUAL
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
JANUARY, 2016
MODEL: SH7 (SH7, SPH7-W)
SMART Hi-Fi AUDIO
Wireless Multi-room Sound Bar
MODEL: SH7
(SH7, SPH7-W)
Internal Use Only
P/NO : AFN77195074
CONTENTS
SECTION 1 ........ SUMMARY
SECTION 2 ........ CABINET & MAIN CHASSIS
SECTION 3 ........ ELECTRICAL
SECTION 4 ........ WIRELESS SUBWOOFER PART
SECTION 5 ........ REPLACEMENT PARTS LIST
1-1
SECTION 1
SUMMARY
CONTENTS
PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO PRODUCTS .............................................. 1-3
SERVICING PRECAUTIONS .......................................................................................................................... 1-4
• GENERAL SERVICING PRECAUTIONS
• INSULATION CHECKING PRODEDURE
• ELECTROSTATICALLY SENSITIVE (ES) DEVICES
WIRELESS SUBWOOFER CONNECTION ................................................................................................... 1-5
HIDDEN MODE ................................................................................................................................................. 1-6
LAN UPDATE GUIDE ...................................................................................................................................... 1-7
SOFTWARE UPDATE GUIDE ...................................................................................................................... 1-11
VERSION CHECK .......................................................................................................................................... 1-15
OPTION EDIT GUIDE .................................................................................................................................... 1-16
SPECIFICATIONS .......................................................................................................................................... 1-17
1-2
PRODUCT SAFETY SERVICING GUIDELINES
FOR AUDIO PRODUCTS
IMPORTANT SAFETY NOTICE
This manual was prepared for use only by properly trained audio-video service
technicians.
When servicing this product, under no circumstances should the original design be
modified or altered without permission from LG Corporation. All components should
be replaced only with types identical to those in the original circuit and their physical
location, wiring and lead dress must conform to original layout upon completion of
repairs.
Special components are also used to prevent x-radiation, shock and fire hazard.
These components are indicated by the letter “x” included in their component designators and are required to maintain safe performance. No deviations are allowed
without prior approval by LG Corporation.
Circuit diagrams may occasionally differ from the actual circuit used. This way, implementation of the latest safety and performance improvement changes into the set is
not delayed until the new service literature is printed.
CAUTION : Do not attempt to modify this product in any way. Never perform cus-
tomized installations without manufacturer’s approval. Unauthorized modifications
will not only void the warranty, but may lead to property damage or user injury.
Service work should be performed only after you are thoroughly familiar with these
safety checks and servicing guidelines.
GRAPHIC SYMBOLS
The exclamation point within an equilateral triangle is intended to alert
the service personnel to important safety information in the service
literature.
The lightning flash with arrowhead symbol within an equilateral
triangle is intended to alert the service personnel to the presence of
noninsulated “dangerous voltage” that may be of sufficient magnitude
to constitute a risk of electric shock.
The pictorial representation of a fuse and its rating within an equilateral triangle is intended to convey to the service personnel the following fuse replacement caution notice:
CAUTION : FOR CONTINUED PROTECTION AGAINST RISK
OF FIRE, REPLACE ALL FUSES WITH THE SAME TYPE AND
RATING AS MARKED NEAR EACH FUSE.
SERVICE INFORMATION
While servicing, use an isolation transformer for protection from AC line shock. After
the original service problem has been corrected, make a check of the following:
FIRE AND SHOCK HAZARD
1. Be sure that all components are positioned to avoid a possibility of adjacent component shorts. This is especially important on items trans-ported to and from the
repair shop.
2. Verify that all protective devices such as insulators, barriers, covers, shields, strain
reliefs, power supply cords, and other hardware have been reinstalled per the
original design. Be sure that the safety purpose of the polarized line plug has not
been defeated.
3. Soldering must be inspected to discover possible cold solder joints, solder
splashes, or sharp solder points. Be certain to remove all loose foreign particles.
4. Check for physical evidence of damage or deterioration to parts and components,
for frayed leads or damaged insulation (including the AC cord), and replace if
necessary.
5. No lead or component should touch a high current device or a resistor rated at 1
watt or more. Lead tension around protruding metal surfaces must be avoided.
6. After reassembly of the set, always perform an AC leakage test on all exposed
metallic parts of the cabinet (the channel selector knobs, antenna terminals,
handle and screws) to be sure that set is safe to operate without danger of electrical shock. DO NOT USE A LINE ISOLATION TRANSFORMER DURING THIS
TEST. Use an AC voltmeter having 5000 ohms per volt or more sensitivity in the
following manner: Connect a 1500 ohm, 10 watt resistor, paralleled by a .15 mfd
150V AC type capacitor between a known good earth ground water pipe, conduit, etc.) and the exposed metallic parts, one at a time. Measure the AC voltage
across the combination of 1500 ohm resistor and .15 mfd capacitor. Reverse the
AC plug by using a non-polarized adaptor and repeat AC voltage measurements
for each exposed metallic part. Voltage measured must not exceed 0.75 volts
RMS. This corresponds to 0.5 milliamp AC. Any value exceeding this limit constitutes a potential shock hazard and must be corrected immediately.
TIPS ON PROPER INSTALLATION
1. Never install any receiver in a closed-in recess, cubbyhole, or closely fitting shelf
space over, or close to, a heat duct, or in the path of heated air flow.
2. Avoid conditions of high humidity such as: outdoor patio installations where dew
is a factor, near steam radiators where steam leakage is a factor, etc.
3. Avoid placement where draperies may obstruct venting. The customer should
also avoid the use of decorative scarves or other coverings that might obstruct
ventilation.
4. Wall- and shelf-mounted installations using a commercial mounting kit must follow
the factory-approved mounting instructions. A product mounted to a shelf or platform must retain its original feet (or the equivalent thickness in spacers) to provide
adequate air flow across the bottom. Bolts or screws used for fasteners must not
touch any parts or wiring. Perform leakage tests on customized installations.
5. Caution customers against mounting a product on a sloping shelf or in a tilted
position, unless the receiver is properly secured.
6. A product on a roll-about cart should be stable in its mounting to the cart.
Caution the customer on the hazards of trying to roll a cart with small casters
across thresholds or deep pile carpets.
7. Caution customers against using extension cords. Explain that a forest of extensions, sprouting from a single outlet, can lead to disastrous consequences to
home and family.
1-3
SERVICING PRECAUTIONS
CAUTION: Before servicing the
service data and its supplements and addends, read and follow the SAFETY PRECAUTIONS.
NOTE: if unforeseen circumstances create conflict between
the following servicing precautions and any of the safety
precautions in this publication, always follow the safety precautions.
Remember Safety First :
General Servicing Precautions
1. Always unplug the
AC power source before:
(1) Removing or reinstalling any component, circuit board,
module, or any other assembly.
(2) Disconnecting or reconnecting any internal electrical
plug or other electrical connection.
(3) Connecting a test substitute in parallel with an electro-
lytic capacitor.
Caution: A wrong part substitution or incorrect polarity
installation of electrolytic capacitors may result in an
explosion hazard.
2. Do not spray chemicals on or near this
of its assemblies.
3. Unless specified otherwise in this service data, clean electrical contacts by applying an appropriate contact cleaning
solution to the contacts with a pipe cleaner, cotton-tipped
swab, or comparable soft applicator.
Unless specified otherwise in this service data, lubrication
of contacts is not required.
4. Do not defeat any plug/socket B+ voltage interlocks with
which instruments covered by this service manual might be
equipped.
5. Do not apply AC power to this
of its electrical assemblies unless all solid state device heat
sinks are correctly installed.
6. Always connect the test instrument ground lead to an
appropriate ground before connecting the test instrument
positive lead. Always remove the test instrument ground
lead last.
Insulation Checking Procedure
Disconnect the attachment plug from the AC outlet and turn
the power on. Connect an insulation resistance meter (500V)
to the blades of the attachment plug. The insulation resistance between each blade of the attachment plug and accessible conductive parts (Note 1) should be more than 1Mohm.
Note 1: Accessible Conductive Parts include Metal panels,
Input terminals, Earphone jacks,etc.
Audio products
Audio products
AC power cord from the
Audio products
covered by this
Audio products
and / or any
or any
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged
easily by static electricity. Such components commonly are
called Electrostatically Sensitive (ES) Devices. Examples
of typical ES 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 ES
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
ES 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 ES devices.
5. Do not use freon-propelled chemicals. These can generate
an electrical charge sufficient to damage ES devices.
6. Do not remove a replacement ES device from its protective
package until immediately before you are ready to install
it. (Most replacement ES devices are packaged with leads
electrically shorted together by conductive foam, aluminum
foil, or comparable conductive material).
7. Immediately before removing the protective material from
the leads of a replacement ES device, touch the protective
material to the chassis or circuit assembly into which the
device will be installed.
Caution: Be sure no power is applied to the chassis or cir-
cuit, and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged
replacement ES devices. (Normally 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 ES device.)
1-4
WIRELESS SUBWOOFER CONNECTION
LED indicator of wireless subwoofer
LED Color Status
Green
(Blink)
Green The connection is completed.
Red
Off
(No display)
The connection is trying.
The wireless subwoofer is
in standby mode or the
connection is failed.
The power cord of wireless
subwoofer is disconnected.
Setting up the wireless subwoofer
for the fi rst time
1. Connect the power cord of the wireless subwoofer
to the outlet.
2. Turn on the main unit : The main unit and wireless
subwoofer will be automatically connected.
Manually pairing wireless subwoofer
4. Disconnect the power cord of the main unit and the
wireless subwoofer.
5. Connect them again after the LED of the main unit
and the wireless subwoofer is fully turned off.
The main unit and the wireless subwoofer will be
paired automatically when you turn on the main unit.
- When the connection is completed, you can see
the green LED on the subwoofer.
Note
:
• It takes a few seconds (and may take longer) for the
main unit and the subwoofer to communicate with
each other and make sounds.
• The closer the main unit and the subwoofer, the
better sound quality. It is recommended to install the
main unit and the subwoofer as close as possible
and avoid the cases below.
- There is a obstacle between the main unit and the
subwoofer.
- There is a device using same frequency with this
wireless connection such as a medical equipment,
a microwave or a wireless LAN device.
When your connection is not completed, you can see
the red LED or the blinking of green LED on the wireless
subwoofer and the subwoofer does not make sound. To
solve the problem, follow the below steps.
1. Adjust volume level of the main unit to minimum.
- ”VOL MIN” appears on the display window.
2. Press and hold (Mute) on the remote control for
about 3 seconds.
- “SUB-WF RESET” appears on the display window
briefl y.
3. If the LED of the wireless subwoofer already blinks
in green continually, you can skip this step.
Press and hold PAIRING on the back of the wireless
subwoofer for more than 5 seconds.
Red Green
-
The LED of the wireless subwoofer lights up alternately
in red and green.
1-5
HIDDEN MODE
Reset the Speaker
Press and hold the ‘ (Add)’ button for 8 seconds.
Micom reset
Main unit ‘ (Volume)’ + Remote control ‘SOUND EFFECT’
Option code mode
Main unit ‘ (Volume)’ + Remote control ‘ (Night Mode)’
Wireless reset
Main unit “VOL MIN” (volume minimum state) + Remote control ‘ (Mute)’ for about 3 seconds.
1-6
LAN UPDATE GUIDE
1. Using MP tool
1) Open MP tool and select “Key DN”.
2) Check the section for download and open download fi le.
1-7
3) Connect PC and SET by cross LAN cable.
PC IP setting
IP: 192.168.0.1
Subnet: 255.255.254.0
Gateway: 10.168.0.1
4) Set power on.
5) Connect LAN cable to Set and then Press “ADD” key within 3 seconds after connect the LAN.
(Please connect the LAN when blinking WiFi-LED after booting)
*Download fi le name
B/E : LG_NB_B200M06.ROM
MICOM : MICOM_LAS760.HEX
※ Caution : Do not you update the B/E program and MICOM program at the same time.
6) Connect Status change “OK!” if success connect MP tool.
1-8
7) Press “Update” button.
8) Download result display “OK!” if start download.
1-9
9) You can identify update status by network indicator lamp.
White
<Updating : blinking white LED>
1-10
SOFTWARE UPDATE GUIDE
1. Using USB
1-1. MICOM
1) Copy the fi rmware to USB.
- Change the fi le name to “MICOM_LAS760.HEX”.
2) Insert USB to USB port.
3) VFD display “UPGRADE”.
4) Press “PLAY/PAUSE” key.
5) VFD display “M-UPDATE”.
6) Set auto power off after updating done.
1-2. MPEG
1) Copy the fi rmware to USB.
- Make the folder by “UPG_ALL” and copy fi rmware in “UPG_ALL” folder.
- Change the fi le name to “LG_NB_B200M06.ROM”.
2) Insert USB to USB port.
3) VFD display “UPGRADE”.
4) Press “PLAY/PAUSE” key.
5) VFD display “B-UPDATE”.
6) Set auto power off after updating done.
1-3. MEQ
1) Copy the fi rmware to USB.
- Change the fi le name to “MEG_LAS760.BIN”.
2) Insert USB to USB port.
3) VFD display “UPGRADE”.
4) Press “PLAY/PAUSE” key.
5) VFD display “UPDATE”.
6) Return to the before function, after fi nished the updating.
1-4. EQ
1) Copy the fi rmware to USB.
- Change the fi le name to “EQ_PRG_LAS760.bin”.
2) Insert USB to USB port.
3) VFD display “UPGRADE”.
4) Press “PLAY/PAUSE” key.
5) VFD display “EQUPDATE”.
6) Set auto power off after fi nished the updating.
1-11
2. Using APP
Power on Smart Audio and implement Music Flow App in your smart phone.
1) Connect Speaker.
2) Select red box.
3) Settings -> Version Info.
4) Select Version info.
1-12
5) Display “Need to update” if there are
new fi rmware in the server.
※ Display new version info
if you press “Need to update”.
6) Start Update below icon.
※ Display update progress info.
※ Do not power off
during update.
1-13
7) Display update info.
8) Display “Update is completed” message when Complete update.
1-14
VERSION CHECK
1) PC IP setting
IP: 192.168.0.1
Subnet: 255.255.254.0
Gateway: 10.168.0.1
2) Open MP tool.
3) Set power on.
4) Press “ADD” button after connect LAN cable.
5) Display the version in the tool.
1-15
OPTION EDIT GUIDE
1-1. Option Edit-1
1) PC IP setting
IP: 192.168.0.1
Subnet: 255.255.254.0
Gateway: 10.168.0.1
2) Open MP tool.
3) Check Option Transmission and select option fi le by “File open” button.
4) Set power on.
5) Press “ADD” button after connect LAN cable.
6) Enter “Update” button in the tool menu.
7) Download result is “OK” or “NG”.
1-2. Option Edit-2 (Need a HTS Remote control)
1) Hidden mode : Remote control “NIGHT” + Main unit “Vol-” key.
2) Change option code by remote control.
1-16
SPECIFICATIONS
• GENERAL
Power requirements 25 V 1.52 A (AC adapter)
Power consumption 22 W
Networked standby : 5.8 W (If all network ports are activated.)
AC adapter Model : DA-38A25
Manufacturer: Asian Power Devices Inc.
Input: 100 - 240 V ~ 50/60 Hz
Output: 25 V 1.52 A
Dimensions (W x H x D) Approx. 1060 mm x 53 mm x 85 mm
Net Weight Approx. 2.8 kg
Operating temperature 5 °C to 35 °C
Operating humidity 5 % to 90 %
Available Digital Input Audio
Sampling Frequency 32 kHz, 44.1 kHz, 48 kHz, 96 kHz
• INPUT/OUTPUT
OPTICAL IN 3 V (p-p), Optical jack x 1
PORTABLE IN 0.5 Vrms (3.5 mm stereo jack) x 1
HDMI IN 19 Pin (Type A, HDMI™ connector) x 1
HDMI OUT 19 Pin (Type A, HDMI™ connector) x 1
• AMPLIFIER (RMS OUTPUT)
Total 360 W
Front 40 W x 2 (4 Ω at 1 kHz, THD 10%)
Surround 40 W x 2 (8 Ω at 12 kHz, THD 10%)
Subwoofer 200 W (3 Ω at 80 Hz, THD 10%)
WIRELESS SUBWOOFER
•
Power requirements Refer to the main label on the subwoofer.
Power consumption Refer to the main label on the subwoofer.
Type 1 Way 1 Speaker
Impedance 3 Ω
Rated Input Power 200 W
Max. Input Power 400 W
Dimensions (W x H x D) Approx. 171 mm x 320 mm x 252 mm
Net Weight Approx. 4.3 kg
• SYSTEM
LAN port Ethernet jack x 1, 10 BASE-T/100 BASE-TX
Wireless LAN (Internal antenna) Integrated IEEE 802.11n (Draft 2.0) wireless networking access,
compatible with 802.11a/b/g/n Wi-Fi networks.
• Designs and specifications are subject to change without prior notice.
1-17
1-18
SECTION 2
CABINET & MAIN CHASSIS
CONTENTS
DISASSEMBLY INSTRUCTIONS ................................................................................................................... 2-2
1. HOW TO DISASSEMBLE THE MAIN SET .............................................................................................. 2-2
2. HOW TO DISASSEMBLE THE WOOFER ............................................................................................... 2-6
EXPLODED VIEWS ......................................................................................................................................... 2-9
1. MAIN SET SECTION ................................................................................................................................ 2-9
2. WIRELESS SUBWOOFER SECTION .................................................................................................... 2-11
3. PACKING ACCESSORY SECTION ....................................................................................................... 2-13
2-1
DISASSEMBLY INSTRUCTIONS
1. HOW TO DISASSEMBLE THE MAIN SET
1) Remove the 22 screws.
2) Remove the Case Bottom Assembly.
Figure 1-1
Figure 1-2
2-2
HOW TO DISASSEMBLE THE MAIN SET
3)
Remove the 4 screws, Disconnect the Harness/FFC cables (KEY, SPK and Wi-Fi) and Remove the Main PCB Assembly.
4) Remove the SPK Chamber L/R Assembly.
Figure 1-3
Figure 1-4
2-3
HOW TO DISASSEMBLE THE MAIN SET
G
5) Remove the L/R Deco Assembly.
G
Figure 1-5
6) Remove the 4 screws and Disconnect FFC cables (BT, Wireless).
BT
Wireless
Figure 1-6
2-4
HOW TO DISASSEMBLE THE MAIN SET
7) Disassembly fi nish.
Figure 1-7
2-5
2. HOW TO DISASSEMBLE THE WOOFER
1) Remove the 13 screws and pull out the Rear Panel Assembly.
Figure 2-1
2) Remove the 5 screw s and Disconnect Harness/FFC cables (Wireless , Power, SPK) .
3) Remove the WF board Assembly and the Wireless Module.
Power Inlet
Socket
Remove EVA
covered Wireless module
Wireless
FFC cable
SPK cable
Figure 2-2
2-6
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