LG FH6 User manual

SERVICE MANUAL
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
Internal Use Only
High Power
All-in-One Speaker System
MAY, 2016P/NO : AFN77381458
MODEL: FH6
MODEL: FH6

1-1
CONTENTS
SECTION 1 ........ SUMMARY
SECTION 2 ........ CABINET & MAIN CHASSIS
SECTION 3 ........ ELECTRICAL
SECTION 4 ........ REPLACEMENT PARTS LIST

1-2
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
HIDDEN KEY MODE ......................................................................................................................................... 1-5
SERVICE INFORMATION FOR EEPROM........................................................................................................ 1-6
PROGRAM DOWNLOAD GUIDE...................................................................................................................... 1-7
1. MICOM PROGRAM
2. MCS PROGRAM
3. EQ PROGRAM
FOTA UPDATE STEP USING BT APP .......................................................................................................... 1-10
SPECIFICATIONS ........................................................................................................................................... 1-12

1-3
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 des-
ignators 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, imple-
mentation 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 equilat-
eral triangle is intended to convey to the service personnel the follow-
ing 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 com-
ponent 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 electri-
cal 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, con-
duit, 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 consti-
tutes 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 plat-
form 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 exten-
sions, sprouting from a single outlet, can lead to disastrous consequences to
home and family.

1-4
SERVICING PRECAUTIONS
CAUTION: Before servicing the Audio products covered by this
service data and its supplements and addends, read and fol-
low 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 pre-
cautions.
Remember Safety First :
General Servicing Precautions
1. Always unplug the
Audio products AC power cord from 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
Audio products or any
of its assemblies.
3. Unless specified otherwise in this service data, clean elec-
trical 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
Audio products and / or any
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 resis-
tance between each blade of the attachment plug and acces-
sible conductive parts (Note 1) should be more than 1Mohm.
Note 1: Accessible Conductive Parts include Metal panels,
Input terminals, Earphone jacks,etc.
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 compo-
nent or semiconductor-equipped assembly, drain off any
electrostatic charge on your body by touching a known
earth ground. Alternatively, obtain and wear a commer-
cially 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 elec-
tricity sufficient to damage an ES device.)

1-5
HIDDEN MODE AVAILABLE STATUS ENTRANCE KEY(Audio) EXIT KEY DISPLAY
Version Check POWER ON STATUS
Front ‘Stop’
(FH6 : Front ‘Play’)
+ RMC ‘Play’ for 5s
RMC ‘Play’ for 1.5s
1) P-1212040
※ If there is a sub
P1-1212040 (Main)
P2-1212040 (Sub)
2) M 1211281 (Micom)
3) OP00 05
4) D-1211140 (Demo)
5) J-1211140 (DJ PRO)
6) Q-1211140
7) EQCS-31C5
EEPROM INITIAL POWER ON STATUS
Front ‘Stop’
(FH6 : Front ‘Play’)
+ RMC ‘I’ for 5s
auto exit “E2P CLR”
Option EDIT POWER ON STATUS
Front ‘Stop’
(FH6 : Front ‘Play’)
+ RMC ‘I’ for 5s
Front ‘Stop’ + RMC ‘I’ OP00-10
APD Test Display POWER ON STATUS
Front ‘Stop’
(FH6 : Front ‘Play’)
+ RMC ‘3’ for 5s
auto exit APD HHMMSS
Clip POWER ON STATUS
Front ‘Stop’
(FH6 : Front ‘Play’)
+ RMC ‘Mute’ for 5s
auto exit
CLIP OFF
00 00
CLIP ON
Disc Lock On/Off POWER ON STATUS Front ‘Stop’ + RMC ‘Stop’
for 5s
Front ‘Stop’
+ RMC ‘Stop’ for 5s
‘LOCKED’ /
‘UNLOCKED’
Power Disc Lock On/Off POWER ON STATUS
Front ‘Stop’
+ RMC ‘EQ’ for 5s
or
Front ‘Stop’
+ Front Open for 5s
Front ‘Stop’
+ RMC ‘EQ’ for 5s
or
Front ‘Stop’
+ Front Open for 5s
‘LOCKED’ /
‘UNLOCKED’
Demo ALL Key Lock
POWER ON STATUS
Demo Function Only
Active
Front ‘Stop’
(FH6 : Front ‘Play’)
+ RMC ‘9’ for 5s
Front ‘Stop’
+ RMC ‘9’ for 5s
‘KEY LOCK’ /
‘UNLOCKED’
BT Auto Power On/Off POWER ON STATUS Front/RMC ‘Power’ for 5s Front/RMC ‘Power’
(SET Power Off)
‘KEY LOCK’ /
‘UNLOCKED’
ChildSafe On/Off POWER ON STATUS Volume 0(Min)
+ Front ‘ENTER’ for 3s
Volume 0(Min)
+ Front ‘ENTER’ for 3s
‘CHILDSAFE ON’ /
‘CHILDSAFE OFF’
Scroll
Measure POWER ON STATUS
Front ‘Stop’
(FH6 : Front ‘Play’)
+ RMC ‘1’ for 5s
RMC ‘SOUND EFFECT’ ‘MEASURE’ /
‘MEASURE MODE’
HIDDEN KEY MODE

1-6
SERVICE INFORMATION FOR EEPROM
NAME
OPT0
OPT1
OPT2
OPT3
OPT4
OPT5
OPT6
OPT7
OPT8
OPT9
OPT10
OPT11
OPT12
OPT13
OPT14
DETECT NEW EEPROM
(OPTION EDIT SCREEN)
HEX
01
11
25
06
09
00
00
46
48
36
00
00
00
00
00
Move to appropriate position
And make changes with remote control
“I, I, INFO, REPEAT” key.
Front ‘PLAY’ + Remote control ‘I’
push same timing during 5 s.
POWER ON
VFD “NO DISC” status It is possible at any function.
This is an example on USB Function.
FLD “OP00-…..”
Press ‘Play’ key.
VFD “WRITE OK”
Front ‘PLAY’ + Remote control ‘I’
push same timing.
VFD “E2P CLR”
Completed.

1-7
PROGRAM DOWNLOAD GUIDE
1. MICOM PROGRAM
Download program file name must be MICOM_FH6_YYMMDDX.HEX
If security program(Water Wall) is activated on PC, you must save the file to the USB storage device and
disable the security software, then download the file to your set.
Caution: When downloading the file, you should neither unplug the USB device, change to the other function,
nor power off the device. USB device must be unplugged when the downloading process is completed.
ON VFD DISPLAY SCREEN
1) (Fast) Format USB device.
2) Copy Firmware file to USB device.
NO USB
Insert USB device at USB function.
SEARCH

MICOM UP

FINISH

Auto POWER OFF

1-8
2. MCS PROGRAM
Download program file name must be HG690_FH6_YYMMDDX.bin
If security program(Water Wall) is activated on PC, you must save the file to the USB storage device and
disable the security software, then download the file to your set.
Caution: When downloading the file, you should neither unplug the USB device, change to the other function,
nor power off the device. USB device must be unplugged when the downloading process is completed.
ON VFD DISPLAY SCREEN
1) (Fast) Format USB device.
2) Copy Firmware file to USB device.
NO USB
Insert USB device at USB function.
SEARCH

FIRMWARE

FINISH

Auto POWER OFF

1-9
3. EQ PROGRAM
Download program file name must be EQ_PRG.BIN
If security program(Water Wall) is activated on PC, you must save the file to the USB storage device and
disable the security software, then download the file to your set.
Caution: When downloading the file, you should neither unplug the USB device, change to the other function,
nor power off the device. USB device must be unplugged when the downloading process is completed.
ON VFD DISPLAY SCREEN
1) (Fast) Format USB device.
2) Copy Firmware file to USB device.
NO USB
Insert USB device at USB function.
SEARCH

EQ UP

FINISH

Auto POWER OFF

1-10
FOTA UPDATE STEP USING BT APP
Step1. App Connecting
(Check FW version)
After connecting the BT APP with SET,
the user could find the “Device Version info”
on Setting tab.
Step3. Select update button
When touch the “Update” button, user could
update the SET firmware using FOTA.
Step2. Device version info
When touch the “Device Version info” button,
user could find the current and latest SET
version on pop-up menu.
Step4. Download from CDN server
1st step is download from CDN server to smart
phone. The progress bar is displayed on BT App.

1-11
Step5. Transfer FW
After completed the download from server,
smart phone start to transfer the firmware to the
SET. The progress bar is displayed on BT App.
Step7. FOTA complete
When finishing the flash memory writing,
pop-up message about finish is displayed
and the SET auto power off.
Step6. FW flash writing
After completed the download from the smart
phone, the SET overwrite the firmware to
flash memory.

1-12
GENERAL
Power requirements Refer to the main label on the unit.
Power consumption Refer to the main label on the unit.
Networked standby : 0.5 W
(If all network ports are activated.)
Dimensions (W x H x D) Approx. 818 mm x 318 mm x 388 mm
Net Weight Approx. 17.2 kg
Operating temperature 5 °C to 35 °C (41 °F to 95 °F)
Operating humidity 60 %
INPUTS
Analog audio in (AUX IN) 1.2 Vrms (1 kHz, 0 dB), 600 Ω, RCA jack (L, R)
Microphone (MIC 1/2) Sensitivity 15 mV (1 kHz), 6.3 mm jack x 2
TUNER
FM Tuning Range 87.5 to 108.0 MHz or 87.50 to 108.00 MHz
SYSTEM
Frequency Response 80 to 20,000 Hz
Signal-to-noise ratio More than 75 dB
Dynamic range More than 80 dB
Bus Power Supply (USB) 5 V 1 A
AMPLIFIER (RMS OUTPUT POWER)
Total output 600 W
Front 300 W × 2 (4 Ωat 1 KHz, 10 % THD)
Design and specifications are subject to change without notice.
SPECIFICATIONS

2-1
SECTION 2
CABINET & MAIN CHASSIS
CONTENTS
DISASSEMBLY INSTRUCTIONS ..................................................................................................................... 2-2
EXPLODED VIEWS ........................................................................................................................................... 2-5
1. CABINET AND MAIN FRAME SECTION ................................................................................................. 2-5
2. PACKING ACCESSORY SECTION ......................................................................................................... 2-7

2-2
DISASSEMBLY INSTRUCTIONS
: Cap
Figure 1. Case Rear
Figure 2. Panel Side R
Note: Assemble Guide is reverse disassembly guide.
1) Separating Screw 14EA at Case Rear. And Remove Case Rear.
2) After Separate Cap 3EA, Remove Screw 7EA. And, Separate Knob.

2-3
: Foot Rubber
Figure 3. Panel Side L
Figure 4. Fan Bracket
3) After Separate Foot Rubber 3EA, Remove Screw 7EA.
4) Separating Screw 4EA at Chassis Main. And Remove Fan Bracket.

2-4
Figure 5. Main PCB, SMPS PCB
Figure 6. Chassis Main
5) Separating Screw 15EA at Chassis Main. And Remove Main PCB, SMPS PCB.
6) Separating Screw 11EA at Wood Assy. And Remove Chassis Main.

B
CA
E
J
K
G
F
D
J
I
H
A
B
C
D
M
M
E
I
H
F
L
G
K
L
A43
251
284
284
464
284 464
464
A42L
516
516
250
260
A44
A52
261
A47
MAIN
SMPS A46
264
265
464
516
516
464
281
282
A42R
464
464
A49 251
283
464 279
278
464
A48
464
516
300
251
A41
251
464
464
464
464
464
516
464
464
CABLE1
CABLE3 262
263
A45
276
VFD
BT
DJ KEY
CABLE2
277
253
266
252
NFC
280
EXPLODED VIEWS
1. CABINET AND MAIN FRAME SECTION
2-62-5
NOTES) THE EXCLAMATION POINT WITHIN AN
EQUILATERAL TRIANGLE IS INTENDED
TO ALERT THE SERVICE PERSONNEL
TO THE PRESENCE OF IMPORTANT
SAFETY INFORMATION IN SERVICE
LITERATURE.

2. PACKING ACCESSORY SECTION
2-82-7
804 Bag
802 Box
803 Main packing
825 FM antenna
801 Owner’s manual 808 Batteries
900 Remote control

SECTION 3 ELECTRICAL
CONTENTS
ONE POINT REPAIR GUIDE ............................................................................................................................ 3-2
1. NO POWER PROBLEM ......................................................................................................................... 3-2
2. NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE ON VFD........................................ 3-5
3. NO AUDIO FROM SPEAKER............................................................................................................... 3-12
4. NO SOUND........................................................................................................................................... 3-13
5. BT CONNECTION ERROR .................................................................................................................. 3-16
6. NO LIGHTING (SPK LED, SPARKLING LED) ..................................................................................... 3-17
7. PROTECTION SYMPTOM OCCURRENCE......................................................................................... 3-18
ELECTRICAL TROUBLESHOOTING GUIDE................................................................................................. 3-19
1. SYSTEM POWER SUPPLY ON SMPS BOARD.................................................................................. 3-19
2. POWER SUPPLY ON MAIN BOARD................................................................................................... 3-22
3. SYSTEM PART..................................................................................................................................... 3-26
4. NO AUDIO OUTPUT ............................................................................................................................ 3-27
5. PROTECTION MODE........................................................................................................................... 3-30
6. NO LIGHTING....................................................................................................................................... 3-31
WAVEFORMS OF MAJOR CHECK POINT.................................................................................................... 3-32
1. DSP (IC501).......................................................................................................................................... 3-32
2. SDRAM (IC502) .................................................................................................................................... 3-33
3. SERIAL FLASH (IC504)........................................................................................................................ 3-34
4. ADC (IC201).......................................................................................................................................... 3-34
5. USB (CN102) ........................................................................................................................................ 3-35
6. BLUETOOTH (CN201).......................................................................................................................... 3-35
WIRING DIAGRAM.......................................................................................................................................... 3-37
BLOCK DIAGRAMS ........................................................................................................................................ 3-39
1. SYSTEM BLOCK DIAGRAM ................................................................................................................ 3-39
2. SMPS BLOCK DIAGRAM..................................................................................................................... 3-41
CIRCUIT DIAGRAMS ...................................................................................................................................... 3-43
1. SMPS CIRCUIT DIAGRAM .................................................................................................................. 3-43
2. MAIN - MICOM CIRCUIT DIAGRAM.................................................................................................... 3-45
3. MAIN - DSP CIRCUIT DIAGRAM......................................................................................................... 3-47
4. MAIN - POWER CIRCUIT DIAGRAM................................................................................................... 3-49
5. MAIN - ADC CIRCUIT DIAGRAM......................................................................................................... 3-51
6. MAIN - PWM/ AMP CIRCUIT DIAGRAM.............................................................................................. 3-53
7. VFD CIRCUIT DIAGRAM...................................................................................................................... 3-55
8. MIC CIRCUIT DIAGRAM ...................................................................................................................... 3-57
9. CENTER LED UP CIRCUIT DIAGRAM................................................................................................ 3-59
10. CENTER LED DOWN CIRCUIT DIAGRAM ......................................................................................... 3-61
11. SPK LED RIGHT CIRCUIT DIAGRAM ................................................................................................. 3-63
12. SPK LED LEFT CIRCUIT DIAGRAM.................................................................................................... 3-65
13. DJ KEY CIRCUIT DIAGRAM ................................................................................................................ 3-67
14. FRONT KEY CIRCUIT DIAGRAM ........................................................................................................ 3-69
CIRCUIT VOLTAGE CHART........................................................................................................................... 3-71
1. IC VOLTAGE......................................................................................................................................... 3-71
2. CAPACITOR VOLTAGE ....................................................................................................................... 3-72
3. CONNECTOR VOLTAGE ..................................................................................................................... 3-72
PRINTED CIRCUIT BOARD DIAGRAMS ....................................................................................................... 3-73
1. SMPS P. C. BOARD DIAGRAM ........................................................................................................... 3-73
2. MAIN P. C. BOARD DIAGRAM ............................................................................................................ 3-77
3. VFD P. C. BOARD DIAGRAM .............................................................................................................. 3-79
4. MIC P. C. BOARD DIAGRAM............................................................................................................... 3-79
5. CENTER LED UP P. C. BOARD DIAGRAM ........................................................................................ 3-79
6. CENTER LED DOWN P. C. BOARD DIAGRAM.................................................................................. 3-81
7. SPK LED RIGHT P. C. BOARD DIAGRAM.......................................................................................... 3-81
8. SPK LED LEFT P. C. BOARD DIAGRAM ............................................................................................ 3-81
9. DJ KEY P. C. BOARD DIAGRAM......................................................................................................... 3-83
10. FRONT KEY P. C. BOARD DIAGRAM................................................................................................. 3-87
3-1