LG LAS950M Service Manual

P/NO : AFN77255292 JULY, 2015

(LAS950M, S95A1-D)

CAUTION

BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.

Website http://biz.lgservice.com

Internal Use Only

MODEL: LAS950M (LAS950M, S95A1-D)SERVICE MANUAL

Smart Hi-Fi Audio Wireless
Multi-room Sound Bar

SERVICE MANUAL

MODEL: LAS950M

CONTENTS

SECTION 1 ........ SUMMARY

SECTION 2 ........ ELECTRICAL

SECTION 3 ........ CABINET & MAIN CHASSIS

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

LAN UPDATE GUIDE ...................................................................................................................................... 1-6

SOFTWARE UPDATE GUIDE ...................................................................................................................... 1-10

HOW TO WIRELESS FACTORY RESET & PAIRING ............................................................................... 1-14

HIDDEN MODE ............................................................................................................................................... 1-14

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)

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

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.

- “WL 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.

The connection is trying.

The wireless subwoofer is
in standby mode or the
connection is failed.

The power cord of wireless
subwoofer is disconnected.

- The LED of the wireless subwoofer lights up
alternately in red and green.

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 (within 5 m) 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.

1-5

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.

1-6

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_9000M06.ROM
MICOM : MICOM_LAS950.HEX

6) Connect Status change “OK!” if success connect MP tool.

1-7

7) Press “Update” button.

8) Download result display “OK!” if start download.

1-8

9) You can identify update status by network indicator lamp.

<Updating : blinking red LED>

<Complete update : blinking white LED>

1-9

SOFTWARE UPDATE GUIDE

1. Using USB

1-1. MICOM

1) Copy the fi rmware to USB.

- Change the fi le name to “MICOM_LAS950.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_9000M06.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. DSP

1) Copy the fi rmware to USB.

- Change the fi le name to “DSP_LAS950.HEX”.

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.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.

1-10

2. Using APP

1) Connect set and music fl ow app.

2) Select “setup  update” menu then you can see below menu.

3) Enter “Check” button then display speaker list for update.

download

1-11

4) Enter “download” button then start download to speaker.

download

Downloading…

5) Display below menu after done download then enter “Ready” button for updating.

Ready

Do wnlo aded

1-12

6) Display below menu after done update

Updated

7) Set rebooting. (Booting previous version if failed update.)

1-13

HOW TO WIRELESS FACTORY RESET & PAIRING

1) Main set Wireless Reset.

- Volume Minimum state + Remote control “mute” for 5 seconds.

- Then, “WL RESET” will be displayed on the LCD.

2) Power off Main set.

3) Wireless Subwoofer: Wireless Reset.

- Press and hold PAIRING key on the back of the wireless subwoofer for more than 5 seconds.

- Then, LED will be blinking Red & Green.

4) Power off the Wireless Subwoofer.

5) Power on both.

6) If the Wireless Subwoofer LED color changed Green, they are paired.

HIDDEN MODE

 Reset

Press “ADD” button for 8 seconds.

 Micom reset

Remote control “play” + “WIFI SETUP” key.

 Option code mode

Remote control “2” + “Vol-” key.

 Wireless reset

Volume minimum state + Remote control “mute” for 5 seconds.

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 “2” + “Vol-” key

2) Change option code by remote control.

1-16

SPECIFICATIONS

• GENERAL

Power requirements Refer to the main label on the unit.
Power consumption 50 W
Networked standby : 6.0 W (If all network ports are activated.)
Dimensions (W x H x D) (1100 x 106 x 135) mm (without Foot)
Net Weight (Approx.) 8.2 kg
Operating temperature 5 °C to 35 °C
Operating humidity 5 % to 90 %

• INPUT/OUTPUT

OPT. IN 3 V (p-p), Optical jack x 2
PORTABLE IN 0.5 Vrms (3.5 mm stereo jack) x 1
HDMI IN 19 Pin (Type A, HDMI™ connector) x 3
HDMI OUT 19 Pin (Type A, HDMI™ connector) x 1
Available Digital Input
Audio Sampling Frequency 32 kHz, 44.1 kHz, 48 kHz, 96 kHz

• AMPLIFIER

Total 700 W
Front 75 W x 2 (4 Ω at 1 kHz)
Rear 75 W x 2 (4 Ω at 1 kHz)
Surround 75 W x 2 (4 Ω at 1 kHz)
Center 75 W (4 Ω at 1 kHz)
Subwoofer 175 W (3 Ω at 80 Hz)
THD 10 %

• WIRELESS SUBWOOFER

Power requirements Refer to the main label on the subwoofer.
Power consumption 35 W
Type 1 Way 1 Speaker
Impedance 3 Ω
Rated Input Power 175 W
Max. Input Power 350 W
Dimensions (W x H x D) (296 x 332 x 296) mm
Net Weight (Approx.) 7.6 kg

• SYSTEM

ETHERNET (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.

• BLUETOOTH

Version 4.0
Codec SBC

• Designs and specifications are subject to change without prior notice.

1-17

1-18

SECTION 2

ELECTRICAL

CONTENTS

ONE POINT REPAIR GUIDE ............................................................................................................................ 2-2

1. NO POWER PROBLEM. ........................................................................................................................ 2-2

2. NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE OR

“HELLO” ON FRONT PANEL ................................................................................................................. 2-4

3. NO SOUND ............................................................................................................................................. 2-7

ELECTRICAL TROUBLESHOOTING GUIDE ................................................................................................. 2-12

1. POWER SUPPLY ON SMPS BOARD .................................................................................................. 2-12

2. POWER SUPPLY ON MAIN BOARD ................................................................................................... 2-13

3. SYSTEM PART ..................................................................................................................................... 2-19

4. NO AUDIO OUTPUT ............................................................................................................................ 2-21

5. NO HDMI OUTPUT ............................................................................................................................... 2-23

WAVEFORMS OF MAJOR CHECK POINT .................................................................................................... 2-24

1. ADC I2S WAVEFORM (IC200) ............................................................................................................. 2-24

2. DSP OUTPUT I2S WAVEFORM (IC600) ............................................................................................. 2-25

3. LCD DATA LINE OUTPUT WAVEFORM (IC100) ................................................................................ 2-26

4. RMC WAVEFORM ................................................................................................................................ 2-27

5. I2C WAVEFORM .................................................................................................................................. 2-28

WIRING DIAGRAM .......................................................................................................................................... 2-31

BLOCK DIAGRAMS ........................................................................................................................................ 2-33

1. POWER BLOCK DIAGRAM ................................................................................................................. 2-33

2. SYSTEM BLOCK DIAGRAM ................................................................................................................ 2-35

CIRCUIT DIAGRAMS ...................................................................................................................................... 2-37

1. SMPS CIRCUIT DIAGRAM .................................................................................................................. 2-37

2. MAIN - MICOM CIRCUIT DIAGRAM .................................................................................................... 2-39

3. MAIN - MPEG CIRCUIT DIAGRAM ...................................................................................................... 2-41

4. MAIN - MEMORY CIRCUIT DIAGRAM ................................................................................................ 2-43

5. MAIN - ADC & I/O CIRCUIT DIAGRAM ............................................................................................... 2-45

6. MAIN - DCDC CIRCUIT DIAGRAM ...................................................................................................... 2-47

7. MAIN - DSP CIRCUIT DIAGRAM ......................................................................................................... 2-49

8. MAIN - DAC / AMP CIRCUIT DIAGRAM .............................................................................................. 2-51

9. HDMI CIRCUIT DIAGRAM.................................................................................................................... 2-53

10. FRONT CIRCUIT DIAGRAM ................................................................................................................ 2-55

11. KEY CIRCUIT DIAGRAM...................................................................................................................... 2-57

CIRCUIT VOLTAGE CHART ........................................................................................................................... 2-59

1. ICs ......................................................................................................................................................... 2-59

2. CAPACITORS ....................................................................................................................................... 2-61

3. CONNECTORS ..................................................................................................................................... 2-62

PRINTED CIRCUIT BOARD DIAGRAMS ....................................................................................................... 2-63

1. SMPS P. C. BOARD DIAGRAM ........................................................................................................... 2-63

2. MAIN P. C. BOARD DIAGRAM ............................................................................................................ 2-65

3. HDMI P. C. BOARD DIAGRAM ............................................................................................................ 2-67

4. FRONT P. C. BOARD DIAGRAM ......................................................................................................... 2-67

5. KEY P. C. BOARD DIAGRAM .............................................................................................................. 2-67

2-1

ONE POINT REPAIR GUIDE

1. NO POWER PROBLEM

If the unit doesn’t work by no power problem, repair the set according to the following guide.

1-1. No power

1-1-1. Solution

Replace F901, BD901, TH901 on SMPS board.

1-1-2. How to troubleshoot (Countermeasure)

1) Check if the fuse F901 is open or short-circuit.

2) Check if the bridge diode BD901 is short-circuit by over current with a digital multimeter.

3) Check if the NTC thermistor TH901 is normal or open.

1-1-3. Service hint (Any picture / Remark)

F901

If F901 is not

short-circuit,

replace it with a

same specifi cations

one.

BD901

If BD901 is short-circuit,

replace it with a new one.

2-2

TH901

If TH901 is open,

replace it with a new one.

ONE POINT REPAIR GUIDE

NO POWER PROBLEM

If the unit doesn’t work by no ±PVDD problem, repair the set according to the following guide.

1-2. No AMP power

1-2-1. Solution

Replace F901, Q901 on SMPS board.

1-2-2. How to troubleshoot (Countermeasure)

1) Check if the fuse F901 is open or short-circuit.

2) Check the Drain-Source or Drain-Gate, Gate-Source Resistance of Q901 with a digital multimeter.
 If it is short condition, it’s destroyed. Replace it with a new one.
(Please replace FET at the same time although several FET is OK)

1-2-3. Service hint (Any picture / Remark)

If F901 is not short-circuit,

F901

replace it with a same specifi cations one.

Q901

If Q901 is short-circuit,

replace it with a new one.

2-3

ONE POINT REPAIR GUIDE

IC305

L310

2. NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE OR
“HELLO” ON FRONT PANEL

When you turn on your set, it will blank / no message on front panel, and stand-by LED
doesn't work.

2-1. IC305 System 3.7 VA (No 3.7 VA)

2-1-1. Solution

Replace IC305 on MAIN board.

2-1-2. How to troubleshoot (Countermeasure)

1) Please check 25 VA of IC305 pin7 (VIN).

2) If 25 VA is abnormal, please check SMPS board.

3) If 25 VA is OK, but 3.7 VA is abnormal at the IC305 pin1 (VOUT) & L310, replace IC305.

2-1-3. Service hint (Any picture / Remark)

L310

IC305

< MAIN board top view >

2-4

ONE POINT REPAIR GUIDE

IC308

NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE OR

“HELLO” ON FRONT PANEL

When you turn on your set, it will blank / no message on front panel, and stand-by LED
doesn't work.

2-2. IC308 System 3.3 VA (No 3.3 VA)

2-2-1. Solution

Replace IC308 on MAIN board.

2-2-2. How to troubleshoot (Countermeasure)

1) Please check 3.7 VA of IC308 pin3 (VIN).

2) If 3.7 VA is abnormal, please check IC305 pin1 (VOUT).

3) If 3.7 VA is OK, but 3.3 VA is abnormal at the IC308 pin6 (VOUT), replace IC308.

2-2-3. Service hint (Any picture / Remark)

IC308

< MAIN board top view >

2-5

ONE POINT REPAIR GUIDE

IC304

IC301

NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE OR

“HELLO” ON FRONT PANEL

When you turn on your set, it will blank / no message on front panel, and stand-by LED
doesn't work.

2-3. LCD System power 5 V, 6.2 VA (No VCC_5V, No 6.2VA)

2-3-1. Solution

Replace IC301, IC304 on MAIN board.

2-3-2. How to troubleshoot (Countermeasure)

1) Please check CN401 pin7 (VCC_5V), pin10 (6.2VA).

2) If 5 V, 6.2 VA is abnormal, please check IC301 pin3 (VOUT), IC304 pin1 (SW).

3) If 5 V, 6.2 VA is abnormal, replace IC301, IC304.

2-3-3. Service hint (Any picture / Remark)

IC301

< MAIN board top view >

2-6

IC304

ONE POINT REPAIR GUIDE

CN100

L101

3. NO SOUND

3-1. WIRELESS

3-1-1. Solution

Replace IC102 on MAIN board.

3-1-2. How to troubleshoot (Countermeasure)

1) Please check externally status of Wireless module cable connection on your eyes.
(at CN100 and Wireless module)

2) Please check 3.3 V of WLS_3.3V (at L101).
If 3.3 V is OK, please check SPI signal (WL_SPI_CS/DO/WP/DI/CLK) of IC102 (pin1, 2, 3, 5, 6).

3) If you can’t have no signal, please replace IC102.

4) If 3) is ok, and proceed S/W update (Main set, Wireless Subwoofer) when set is paired.

3-1-3. Service hint (Any picture / Remark)

L101

CN100

< MAIN board top view >

2-7

ONE POINT REPAIR GUIDE

CN2001

L205

NO SOUND

3-2. BLUETOOTH

3-2-1. Solution

Replace IC501 on MAIN board.

3-2-2. How to troubleshoot (Countermeasure)

1) Please check externally status of Bluetooth module cable connection on your eyes.
(at CN2011 and Bluetooth module)

2) Please check 3.3 VA (at L205).
If 3.3 VA is OK, please check BT_RST, M_I2S_BCK, BT_PCM_IN of CN2011 (pin12, 11, 10)
and BT_UART_RX, BT_UART_TX (pin4, 6).
If you have no signal, please replace IC501.

3-2-3. Service hint (Any picture / Remark)

CN2001

< MAIN board top view > < MAIN board bottom view >

2-8

L205

ONE POINT REPAIR GUIDE

R204

L203

R205

IC501

NO SOUND

3-3. OPTICAL

3-3-1. Solution

Replace IC501 on MAIN board.

3-3-2. How to troubleshoot (Countermeasure)

1) Please check 3.3 VA (at L203).

2) If you can check 3.3 VA, please check OPT_DET signal (R204, R205) when optical mode.

3) In spite of process 2), set has abnormal output, then replace IC501.

3-3-3. Service hint (Any picture / Remark)

R204

L203

R205

IC501

< MAIN board top view >

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