LG PK7 User manual
SERVICE MANUAL
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
CONFIDENTIAL
MODEL : PK7
MODEL : PK7
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Portable
Bluetooth Speaker
P/NO : AFN78172734 APRIL, 2018
1-1
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
CONTENTS
SECTION 1 ........ SUMMARY
SECTION 2 ........ CABINET & MAIN CHASSIS
SECTION 3 ........ ELECTRICAL
1-2
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
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
NAME OF EACH COMPONENT ....................................................................................................................... 1-5
HIDDEN KEY ..................................................................................................................................................... 1-7
PROGRAM UPDATE GUIDE ............................................................................................................................ 1-8
SERVICE INFORMATION (VERSION & OPTION)......................................................................................... 1-10
SPECIFICATIONS ........................................................................................................................................... 1-12
1-3
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
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
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
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
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Enhanced
Bass
Clear
Vocal
g h i j k l m n
a
b c d e f
aBattery LED
b
[t|jwWPO
c
Bluetooth LED
d
CLEAR VOCAL LED
e
ENHANCED BASS LED
f
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g
_zwsxZs&Zkk5[wjxxny/
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- Adds a Bluetoothij{nhjktwrzqynumtsj
ufnwnsl/"[wjxxfsimtqijktwDxjhtsix-
NmfsljxytBluetooth rtijnsutwyfgqjrtij/
(Press j)
bmjs~tzhtssjhyymjutwyfgqjhfgqj0ymj
kzshyntsnxhmfsljiytutwyfgqjrtij/
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5_zwsit|symj{tqzrj/
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5_zwszuymj{tqzrj/
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Bluetoothrtij/"[fljCD-
]jhjn{jxfhfqqtsymjBluetooth device.
(Page 13)
Xzyjxymjxtzsitsymjutwyfgqjrtij/
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Nmfsljxrttiqnlmy/"[fljCF-
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Nmfsljxxtzsijkkjhy/"[fljCH-
NAME OF EACH COMPONENT
Front
1-6
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
a
b c d e f
a
[twyht{jw
bDC IN
LNfifuyjwnsuzy
c
PORT.IN
Wnxyjsxytrzxnhkwtr~tzwutwyfgqjij{nhj/
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RESET gzyyts
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Ntssjhyxy|txujfpjwxktwizfquqf~/
(Page 25-26)
f
Ozfq[qf~ LED
Rear
1-7
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Description Hidden Key
Factory Reset (Clear Bluetooth paired list) “Bluetooth” key for 7 seconds
Demo wake up “Play/Pause” key (with charging condition)
APD Off / Volume 20 (“Bluetooth” + “Vol_Down”) key for 2 seconds
Bluetooth scan enable “Bluetooth” key for 2 seconds
HIDDEN KEY
1-8
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
PROGRAM UPDATE GUIDE
Step 1. Search and connect speaker. Step 2. Select “setting”.
Step 3. Select “Device version info.” Step 4. Check new version firmware.
Install “Music Flow Bluetooth” app from Google Play Store (Only Android Phone supported)
1-9
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Step 5. Select update button. Step 6. Start downloading firmware.
Step 7. Download from CDN server.
During update, do not off bluetooth connection. Step 8. Transfer firmware.
Caution
:
• Recommend airplane mode (Bluetooth/Wifienabled)
• During update, do not disconnect bluetooth with phone
• LED rotates/blinks while updating firmware
• When update is finished, speaker will be powered off.
1-10
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
1. Phone Settings
1) Enable Bluetooth of the mobile device.
2) Change name of mobile device to “LG_PORT_MP_TEST” in Bluetooth Setting Menu.
SERVICE INFORMATION (VERSION & OPTION)
1-11
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
2. Installation of MP App and Version Check
1) Install & Run “LG MP App”.
2) Press “Connect Device” button on the App.
3) Press and Hold “Bluetooth + Play/Pause” key on the speaker for 2 seconds.
4) A few seconds later, you can see “Bluetooth
pairing request” popup message from the mobile
device.
5) Select “Pair”, and Press “Return” button on the
phone, then checksum/Version/ Option will be
displayed.
1-12
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
SPECIFICATIONS
GENERAL
Power requirements 19 V 1.7 A (AC adapter)
Built-in rechargeable battery
Power consumption Refer to the main label.
AC adapter Model : LCAP25A
Manufacturer : Lien Chang Electronic Enterprise Co., Ltd.
Input : 100-240 V~ 50-60 Hz 1.0 A
Output : 19 V 1.7 A
Dimensions (W x H x D) Approx. 320 mm x 167 mm x 152 mm
Operating temperature 5 °C to 35 °C
Operating humidity 5 % to 60 %
Water-proof IPX5
INPUTS
PORT. IN 0.5 Vrms (3.5 mm stereo jack)
BATTERY
Battery capacity 7.4 Vdc, 5200 mAh (Typ)
7.4 Vdc, 5000 mAh (Min)
Operating time Approx. 24 hours.
It may vary depending on the battery status and operational conditions.
Charging time Less than 3.5 hours (with AC Adapter).
It can be varied depending on the conditions of the battery or operation.
Design and specifications are subject to change without notice.
2-1
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
SECTION 2
CABINET & MAIN CHASSIS
CONTENTS
DISASSEMBLY INSTRUCTIONS ..................................................................................................................... 2-2
ASSEMBLY INSTRUCTIONS ........................................................................................................................... 2-7
EXPLODED VIEWS ......................................................................................................................................... 2-13
1. CABINET AND MAIN FRAME SECTION ............................................................................................... 2-13
2. PACKING ACCESSORY SECTION ....................................................................................................... 2-15
2-2
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
DISASSEMBLY INSTRUCTIONS
1) Remove the 4 Screws.
2) Remove the Side Cover Assembly.
3) Remove the Cover Handle Assembly.
Cover top
Unhook the Hooks by inserting the Flat-head Screw drivers.
4) Remove the Cover Top Assembly.
2-3
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Cover Bottom
5) Remove the Cover Bottom Assembly.
6) Remove the 8 Screws.
7) Remove the Panel Rear assembly.
8) Remove the 6 Screws.
9) Remove the MAIN Holder Assembly.
2-4
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
10) Disconnect the 2 Harness Cables.
11) Remove the 2 Batteries.
Caution! Water-proof (IPX5) - Gasket Rubber should be replaced when disassembling more than 3 times.
12) Remove the 12 screws. (1szzr-0097X)
13) Remove the Speakers.
2-5
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
14) Remove the 4 Screws. (1szzr-0097x)
15) Remove the 4 Screws. (FAB31442101)
16) Remove the Lightning Tube PCB.
17) Remove the Lightning PCB.
Lightning PCB
18) Remove the 8 Screws.(1SZZR-1007B)
19) Remove the Grille.
2-6
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
20) Remove the 3 Screws.(1SZZR-0097X)
21) Remove the 2 Screws. (1FAB30204501)
22) Remove the Jack PCB.
2-7
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
ASSEMBLY INSTRUCTIONS
1) Assemble the Jack PCB.
2) Tighten the 2 Screws.(1FAB30204501)
3) Assemble the Cover Holder.
4) Tighten the 3 Screws.(1SZZR-0097X)
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