CONFIDENTIAL
LED TV
SERVICE MANUAL
CHASSIS : UD71H
MODEL : 49SJ810V 49SJ810V-ZA
55SJ810V 55SJ810V-ZA
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL69780303 (1702-REV00)
Copyright © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
CONTENTS
CONTENTS ............................................................................................... 2
SAFETY PRECAUTIONS ......................................................................... 3
SERVICING PRECAUTIONS..................................................................... 4
SPECIFICATION........................................................................................ 6
SOFTWARE UPDATE ............................................................................. 10
BLOCK DIAGRAM................................................................................... 11
EXPLODED VIEW ................................................................................... 18
DISASSEMBLY GUIDE .......................................................................... 19
TROUBLE SHOOTING GUIDE ................................................. APPENDIX
-2- Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
SAFETY PRECAUTIONS
IMPORTANT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the
Exploded View.
It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent
Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
General Guidance Leakage Current Hot Check (See below Figure)
Plug the AC cord directly into the AC outlet.
An isolation Transformer should always be used during the
servicing of a receiver whose chassis is not isolated from the AC Do not use a line Isolation Transformer during this check.
power line. Use a transformer of adequate power rating as this Connect 1.5 K / 10 watt resistor in parallel with a 0.15 uF capacitor
protects the technician from accidents resulting in personal injury between a known good earth ground (Water Pipe, Conduit, etc.)
from electrical shocks. and the exposed metallic parts.
Measure the AC voltage across the resistor using AC voltmeter
It will also protect the receiver and it's components from being with 1000 ohms/volt or more sensitivity.
damaged by accidental shorts of the circuitry that may be Reverse plug the AC cord into the AC outlet and repeat AC voltage
inadvertently introduced during the service operation. measurements for each exposed metallic part. Any voltage
measured must not exceed 0.75 volt RMS which is corresponds to
If any fuse (or Fusible Resistor) in this TV receiver is blown, 0.5 mA.
replace it with the specified. In case any measurement is out of the limits specified, there is
possibility of shock hazard and the set must be checked and
When replacing a high wattage resistor (Oxide Metal Film Resistor, repaired before it is returned to the customer.
over 1 W), keep the resistor 10 mm away from PCB.
Leakage Current Hot Check circuit
Keep wires away from high voltage or high temperature parts.
Before returning the receiver to the customer,
always perform an AC leakage current check on the exposed
metallic parts of the cabinet, such as antennas, terminals, etc., to
be sure the set is safe to operate without damage of electrical
shock.
Leakage Current Cold Check(Antenna Cold Check)
With the instrument AC plug removed from AC source, connect an
electrical jumper across the two AC plug prongs. Place the AC
switch in the on position, connect one lead of ohm-meter to the AC
plug prongs tied together and touch other ohm-meter lead in turn to
each exposed metallic parts such as antenna terminals, phone
jacks, etc.
If the exposed metallic part has a return path to the chassis, the
measured resistance should be between 1 MΩ and 5.2 MΩ.
When the exposed metal has no return path to the chassis the
reading must be infinite.
An other abnormality exists that must be corrected before the
receiver is returned to the customer.
-3- Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
SERVICING PRECAUTIONS
CAUTION: Before servicing receivers covered by this service 2. After removing an electrical assembly equipped with ES
manual and its supplements and addenda, read and follow the devices, place the assembly on a conductive surface such as
SAFETY PRECAUTIONS on page 3 of this publication. aluminum foil, to prevent electrostatic charge buildup or expo-
NOTE: If unforeseen circumstances create conflict between the sure of the assembly.
following servicing precautions and any of the safety precautions 3. Use only a grounded-tip soldering iron to solder or unsolder
on page 3 of this publication, always follow the safety precau- ES devices.
tions. Remember: Safety First. 4. Use only an anti-static type solder removal device. Some sol-
der removal devices not classified as “anti-static” can generate
General Servicing Precautions electrical charges sufficient to damage ES devices.
1. Always unplug the receiver AC power cord from the AC power 5. Do not use freon-propelled chemicals. These can generate
source before; electrical charges sufficient to damage ES devices.
a. Removing or reinstalling any component, circuit board 6. Do not remove a replacement ES device from its protective
module or any other receiver assembly. package until immediately before you are ready to install it.
b. Disconnecting or reconnecting any receiver electrical plug (Most replacement ES devices are packaged with leads elec-
or other electrical connection. trically shorted together by conductive foam, aluminum foil or
c. Connecting a test substitute in parallel with an electrolytic comparable conductive material).
capacitor in the receiver. 7. Immediately before removing the protective material from the
CAUTION: A wrong part substitution or incorrect polarity leads of a replacement ES device, touch the protective mate-
installation of electrolytic capacitors may result in an explo- rial to the chassis or circuit assembly into which the device will
sion hazard. be installed.
2. Test high voltage only by measuring it with an appropriate high CAUTION: Be sure no power is applied to the chassis or cir-
voltage meter or other voltage measuring device (DVM, FET- cuit, and observe all other safety precautions.
VOM, etc) equipped with a suitable high voltage probe. 8. Minimize bodily motions when handling unpackaged replace-
Do not test high voltage by "drawing an arc". ment ES devices. (Otherwise harmless motion such as the
3. Do not spray chemicals on or near this receiver or any of its brushing together of your clothes fabric or the lifting of your
assemblies. foot from a carpeted floor can generate static electricity suf-
4. Unless specified otherwise in this service manual, clean ficient to damage an ES device.)
electrical contacts only by applying the following mixture to the
contacts with a pipe cleaner, cotton-tipped stick or comparable General Soldering Guidelines
non-abrasive applicator; 10 % (by volume) Acetone and 90 % 1. Use a grounded-tip, low-wattage soldering iron and appropri-
(by volume) isopropyl alcohol (90 % - 99 % strength) ate tip size and shape that will maintain tip temperature within
CAUTION: This is a flammable mixture. the range or 500 °F to 600 °F.
Unless specified otherwise in this service manual, lubrication 2. Use an appropriate gauge of RMA resin-core solder composed
of contacts in not required. of 60 parts tin/40 parts lead.
5. Do not defeat any plug/socket B+ voltage interlocks with which 3. Keep the soldering iron tip clean and well tinned.
receivers covered by this service manual might be equipped. 4. Thoroughly clean the surfaces to be soldered. Use a mall wire-
6. Do not apply AC power to this instrument and/or any of its bristle (0.5 inch, or 1.25 cm) brush with a metal handle.
electrical assemblies unless all solid-state device heat sinks Do not use freon-propelled spray-on cleaners.
are correctly installed. 5. Use the following unsoldering technique
7. Always connect the test receiver ground lead to the receiver a. Allow the soldering iron tip to reach normal temperature.
chassis ground before connecting the test receiver positive (500 °F to 600 °F)
lead. b. Heat the component lead until the solder melts.
Always remove the test receiver ground lead last. c. Quickly draw the melted solder with an anti-static, suction-
8. Use with this receiver only the test fixtures specified in this type solder removal device or with solder braid.
service manual. CAUTION: Work quickly to avoid overheating the circuit
CAUTION: Do not connect the test fixture ground strap to any board printed foil.
heat sink in this receiver. 6. Use the following soldering technique.
a. Allow the soldering iron tip to reach a normal temperature
Electrostatically Sensitive (ES) Devices (500 °F to 600 °F)
Some semiconductor (solid-state) devices can be damaged eas- b. First, hold the soldering iron tip and solder the strand
ily by static electricity. Such components commonly are called against the component lead until the solder melts.
Electrostatically Sensitive (ES) Devices. Examples of typical ES c. Quickly move the soldering iron tip to the junction of the
devices are integrated circuits and some field-effect transistors component lead and the printed circuit foil, and hold it there
and semiconductor “chip” components. The following techniques only until the solder flows onto and around both the compo-
should be used to help reduce the incidence of component dam- nent lead and the foil.
age caused by static by static electricity. CAUTION: Work quickly to avoid overheating the circuit
1. Immediately before handling any semiconductor component or board printed foil.
semiconductor-equipped assembly, drain off any electrostatic d. Closely inspect the solder area and remove any excess or
charge on your body by touching a known earth ground. Alter- splashed solder with a small wire-bristle brush.
natively, obtain and wear a commercially available discharg-
ing wrist strap device, which should be removed to prevent
potential shock reasons prior to applying power to the unit
under test.
-4- Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
IC Remove/Replacement 3. Solder the connections.
Some chassis circuit boards have slotted holes (oblong) through CAUTION: Maintain original spacing between the replaced
which the IC leads are inserted and then bent flat against the cir- component and adjacent components and the circuit board to
cuit foil. When holes are the slotted type, the following technique prevent excessive component temperatures.
should be used to remove and replace the IC. When working with
boards using the familiar round hole, use the standard technique Circuit Board Foil Repair
as outlined in paragraphs 5 and 6 above. Excessive heat applied to the copper foil of any printed circuit
board will weaken the adhesive that bonds the foil to the circuit
Removal board causing the foil to separate from or "lift-off" the board. The
1. Desolder and straighten each IC lead in one operation by following guidelines and procedures should be followed when-
gently prying up on the lead with the soldering iron tip as the ever this condition is encountered.
solder melts.
2. Draw away the melted solder with an anti-static suction-type At IC Connections
solder removal device (or with solder braid) before removing To repair a defective copper pattern at IC connections use the
the IC. following procedure to install a jumper wire on the copper pattern
Replacement side of the circuit board. (Use this technique only on IC connec-
1. Carefully insert the replacement IC in the circuit board. tions).
2. Carefully bend each IC lead against the circuit foil pad and
solder it. 1. Carefully remove the damaged copper pattern with a sharp
3. Clean the soldered areas with a small wire-bristle brush. knife. (Remove only as much copper as absolutely necessary).
(It is not necessary to reapply acrylic coating to the areas). 2. carefully scratch away the solder resist and acrylic coating (if
used) from the end of the remaining copper pattern.
"Small-Signal" Discrete Transistor 3. Bend a small "U" in one end of a small gauge jumper wire and
Removal/Replacement carefully crimp it around the IC pin. Solder the IC connection.
1. Remove the defective transistor by clipping its leads as close 4. Route the jumper wire along the path of the out-away copper
as possible to the component body. pattern and let it overlap the previously scraped end of the
2. Bend into a "U" shape the end of each of three leads remain- good copper pattern. Solder the overlapped area and clip off
ing on the circuit board. any excess jumper wire.
3. Bend into a "U" shape the replacement transistor leads.
4. Connect the replacement transistor leads to the corresponding At Other Connections
leads extending from the circuit board and crimp the "U" with Use the following technique to repair the defective copper pattern
long nose pliers to insure metal to metal contact then solder at connections other than IC Pins. This technique involves the
each connection. installation of a jumper wire on the component side of the circuit
board.
Power Output, Transistor Device
Removal/Replacement 1. Remove the defective copper pattern with a sharp knife.
1. Heat and remove all solder from around the transistor leads. Remove at least 1/4 inch of copper, to ensure that a hazardous
2. Remove the heat sink mounting screw (if so equipped). condition will not exist if the jumper wire opens.
3. Carefully remove the transistor from the heat sink of the circuit 2. Trace along the copper pattern from both sides of the pattern
board. break and locate the nearest component that is directly con-
4. Insert new transistor in the circuit board. nected to the affected copper pattern.
5. Solder each transistor lead, and clip off excess lead. 3. Connect insulated 20-gauge jumper wire from the lead of the
6. Replace heat sink. nearest component on one side of the pattern break to the
lead of the nearest component on the other side.
Diode Removal/Replacement Carefully crimp and solder the connections.
1. Remove defective diode by clipping its leads as close as pos- CAUTION: Be sure the insulated jumper wire is dressed so the
sible to diode body. it does not touch components or sharp edges.
2. Bend the two remaining leads perpendicular y to the circuit
board.
3. Observing diode polarity, wrap each lead of the new diode
around the corresponding lead on the circuit board.
4. Securely crimp each connection and solder it.
5. Inspect (on the circuit board copper side) the solder joints of
the two "original" leads. If they are not shiny, reheat them and
if necessary, apply additional solder.
Fuse and Conventional Resistor
Removal/Replacement
1. Clip each fuse or resistor lead at top of the circuit board hollow
stake.
2. Securely crimp the leads of replacement component around
notch at stake top.
-5- Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement.
1. Application range 3. Test method
This specification is applied to the LED TV used UD71H (1) Performance: LGE TV test method followed
chassis. (2) Demanded other specification
- Safety : CE, IEC specification
- EMC : CE, IEC specification
- Wireless : Wireless HD Specification (Option)
2. Requirement for Test
Each part is tested as below without special notice.
(1) Temperature: 25 °C ± 5 °C(77 °F ± 9 °F), CST: 40 °C ± 5 °C
(2) Relative Humidity: 65 % ± 10 %
(3) Power Voltage
: Standard input voltage (AC 100~240 V, 50/60 Hz)
* Standard Voltage of each products is marked by models.
(4) Specification and performance of each parts are followed
each drawing and specification by part number in
accordance with BOM.
(5) The receiver must be operated for about 20 minutes prior
to the adjustment.
4. Model General Specification
No. Item Specification Remarks
DTV & Analog (Total 37 countries)
DTV (MPEG2/4, DVB-T) : 26 countrie
Germany, Netherland, Switzerland, Hungary, Austria, Slovenia, Bulgaria,
France, Spain, Belgium, Luxemburg, Greece, Czech, Turkey, Morocco,
Ireland, Latvia, Estonia, Lithuania, Poland, Portugal, Romania, Albania,
Bosnia, Slovakia, Belarus
DTV (MPEG2/4, DVB-T2) :11 countries
UK(Ireland), Sweden, Denmark, Finland, Norway, Ukraine, Kazakhstan,
Russia, Italy, Croatia, Serbia
DTV (MPEG2/4, DVB-C) : 37 countries
Germany, Netherland, Switzerland, Hungary, Austria, Slovenia, Bulgaria,
France, Spain, Italy, Belgium, Russia, Luxemburg, Greece, Czech, Croa-
tia, Turkey, Morocco, Ireland, Latvia, Estonia, Lithuania, Poland, Portu-
gal, Romania, Albania, Bosnia, Serbia, Slovakia, Belarus, UK, Sweden,
Denmark, Finland, Norway, Ukraine, Kazakhstan
EU(PAL Market-36Countries)/CIS
1 Market
+ Morocoo(Africa)
DTV (MPEG2/4,DVB-S) : 37 countries
Germany, Netherland, Switzerland, Hungary, Austria, Slovenia, Bulgaria,
France, Spain,Belgium, Luxemburg, Greece, Czech, Turkey, Morocco,
Ireland, Latvia, Estonia, Lithuania, Poland, Portugal, Romania, Albania,
Bosnia, Slovakia, Belarus, UK(Ireland), Sweden, Denmark, Finland, Nor-
way, Ukraine, Kazakhstan,Russia, Italy, Croatia, Serbia
Supported satellite : 35 satellites
ABS1 75.0E, AMOS 4.0W, ASIASAT3S 105.5E, ASTRA 19.2E, ASTRA
23.5E, ASTRA 28.2E, ASTRA 4.8E, ATLANTIC BIRD2 8.0W, ATLANTIC
BIRD3 5.0W, BADR 26.0E, DIRECTV-1R 56.0E, EUROBIRD 9A 9.0E,
EUROBIRD3 33.0E, EUTELSAT 36 A/B 36.0E,EUTELSAT W2A 10.0E,
EUTELSAT W3A 7.0E, EUTELSAT7WA 7.3WEUTELSAT 16.0E, EX-
PRESS AM1 40.0E, EXPRESS AM3 140.0E, EXPRESS AM33 96.5E,
HELLASSAT 39.0E, HISPASAT 1CDE 30.0WHOTBIRD 13.0E, INTEL-
SAT10&7 68.5E, INTELSAT15 85.2E, INTELSAT1R 50.0W, INTEL-
SAT903 33.5W, INTELSAT904 60.0E, NILESAT 7.0W, NSS12 57.0E,
THOR 0.8W, TURKSAT 42.0E,YAMAL201 90.0E, OTHER
-6- Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
No. Item Specification Remarks
(1) Digital TV
- DVB-T
- DVB-T2*
- DVB-C
2 Broadcasting system *:Depending on country
- DVB-S/S2*
(2) Analogue TV
- PAL/SECAM B/G/I/D/K
- SECAM L
(1) Digital TV
1) DVB-T/T2
- VHF III : 174~230MHz
- UHF IV : 470~606MHz
- UHF V : 606~862MHz
- S Band II : 230~300MHz
3 Channel coverage - S Band III : 300 ~470MHz
2) DVB-C
- 46 ~ 890MHz
3) DVB-S/S2
- 950~2150MHz
(2) Analogue TV
- 46~862MHz
▶ DVB-T
- Guard Interval(Bitrate_Mbit/s)
1/4, 1/8, 1/16, 1/32
- Modulation : Code Rate
QPSK : 1/2, 2/3, 3/4, 5/6, 7/8
16-QAM : 1/2, 2/3, 3/4, 5/6, 7/8
64-QAM : 1/2, 2/3, 3/4, 5/6, 7/8
▶ DVB-T2 (Model : *L*V*-Z* (T2 only Model))
- Guard Interval(Bitrate_Mbit/s)
1/4, 1/8, 1/16, 1/32, 1/128, 19/128, 19/256,
- Modulation : Code Rate
QPSK : 1/2, 2/5, 2/3, 3/4, 5/6
16-QAM : 1/2, 2/5, 2/3, 3/4, 5/6
Analog : Upper Heterodyne
4 Receiving system 64-QAM : 1/2, 2/5, 2/3, 3/4, 5/6
Digital : COFDM, QAM
256-QAM : 1/2, 2/5, 2/3, 3/4, 5/6
▶ DVB-C
- Symbolrate :
4.0Msymbols/s to 7.2Msymbols/s
- Modulation :
16QAM, 64-QAM, 128-QAM and 256-QAM
▶ DVB-S/S2
- symbolrate
DVB-S2 (8PSK / QPSK) : 2 ~ 45Msymbol/s
DVB-S (QPSK) : 2 ~ 45Msymbol/s
- viterbi
DVB-S mode : 1/2, 2/3, 3/4, 5/6, 7/8
DVB-S2 mode : 1/2, 2/3, 3/4, 3/5, 4/5, 5/6, 8/9, 9/10
Antenna,
5 Head phone out HDMI1, HDMI2, HDMI3, HDMI4, USB1,
USB2, USB3
6 HDMI Input (4EA) HDMI1, HDMI2, HDMI3, HDMI4
7 SPDIF out (1EA) SPDIF out
8 USB (3EA) EMF, For SVC (download)
9 Ethernet Connect(1EA) Ethernet Connect STP cable.
10 PCMCIA Card slot (1EA) PCMCIA slot
-7- Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
5. External Input Format
5.1. 2D Mode
(1) HDMI Input (DTV)
No. Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed Remarks
1 640*480 31.469 59.94 25.125 SDTV 480P
2 640*480 31.5 60.00 25.125 SDTV 480P
3 720*480 15.73 59.94 13.500 SDTV 576P
4 720*480 15.75 60.00 13.514 HDTV 720P Spec. out but display
5 720*576 15.625 50.00 13.500 HDTV 720P
6 720*480 31.47 59.94 27.00 HDTV 720P
7 720*480 31.5 60.00 27.027 HDTV 1080I
8 720*576 31.25 50.00 27.00 HDTV 1080I
9 1280*720 44.96 59.94 74.176 HDTV 1080I
10 1280*720 45.00 60.00 74.25 HDTV 1080P
11 1280*720 37.50 50.00 74.25 HDTV 1080P
12 1920*1080 28.125 50.00 74.25 HDTV 1080P
13 1920*1080 33.72 59.94 74.176 HDTV 1080P
14 1920*1080 33.75 60.00 74.25 HDTV 1080P
15 1920*1080 26.97 23.976 63.296 HDTV 1080P
16 1920*1080 27.00 24.000 63.36 HDTV 1080P
17 1920*1080 33.71 29.97 79.120 UDTV 2160P
18 1920*1080 33.75 30.00 79.20 UDTV 2160P
19 1920*1080 56.25 50.00 148.50 UDTV 2160P
20 1920*1080 67.432 59.94 148.350 UDTV 2160P
21 1920*1080 67.50 60.00 148.50 UDTV 2160P
22 1920*1080 135.00 120.00 297.00 UDTV 2160P(DVB)
23 1920*1080 135.00 119.88 296.703 UDTV 2160P
24 1920*1080 112.5 100.00 297.00 UDTV 2160P
25 3840*2160 53.95 23.98 296.703 UDTV 2160P
26 3840*2160 54.00 24.00 297.00 UDTV 2160P
27 3840*2160 56.25 25.00 297.00 UDTV 2160P
28 3840*2160 61.43 29.97 296.703 UDTV 2160P
29 3840*2160 67.50 30.00 297.00 UDTV 2160P
When HDMI1,2,3
30 3840*2160 112.50 50.00 594.00 UDTV 2160P(DVB)
UHD DEEP COLOUR ON
When HDMI1,2,3
31 3840*2160 134.865 59.94 593.407 UDTV 2160P
UHD DEEP COLOUR ON
When HDMI1,2,3,4
32 3840*2160 135.00 60.00 594.00 UDTV 2160P
UHD DEEP COLOUR ON
33 4096*2160 53.95 23.98 296.703 UDTV 2160P
34 4096*2160 54.00 24.00 297.00 UDTV 2160P
35 4096*2160 56.25 25.00 297.00 UDTV 2160P
36 4096*2160 61.43 29.97 296.703 UDTV 2160P
37 4096*2160 67.50 30.00 297.00 UDTV 2160P
-8- Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
No. Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed Remarks
When HDMI1,2,3,4
38 4096*2160 112.50 50.00 594.00 UDTV 2160P
UHD DEEP COLOUR ON
When HDMI1,2,3,4
39 4096*2160 134.865 59.94 593.407 UDTV 2160P
UHD DEEP COLOUR ON
When HDMI1,2,3,4
40 4096*2160 135.00 60.00 594.00 UDTV 2160P
UHD DEEP COLOUR ON
(4) HDMI Input (PC)
No. Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed Remarks
1 640*350 31.46 70.09 25.17 EGA
2 720*400 31.46 70.08 28.32 DOS
3 640*480 31.46 59.94 25.17 VESA(VGA)
4 800*600 37.87 60.31 40.00 VESA(SVGA)
5 1024*768 48.36 60.00 65.00 VESA(XGA)
6 1360*768 47.71 60.01 84.75 VESA(WXGA)
7 1152*864 54.34 60.05 80.00 VESA
8 1280*1024 63.98 60.02 109.00 SXGA Support to HDMI-PC
9 1920*1080 67.50 60.00 158.40 WUXGA(Reduced Blanking)
10 3840*2160 54.00 24.00 297.00 UDTV 2160P
11 3840*2160 56.25 25.00 297.00 UDTV 2160P
12 3840*2160 67.50 30.00 297.00 UDTV 2160P
13 4096*2160 53.95 23.97 296.70 UDTV 2160P
14 4096*2160 54.00 24.00 297.00 UDTV 2160P
-9- Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
SOFTWARE UPDATE
1. USB 2. NSU
(1) Insert the USB memory Stick to the USB port. (1) Menu -> All Settings -> General -> About This TV
(2) Automatically detect the SW Version and show the below
message
(2) C lick [CHEK FOR UPDATES] : system check newest
(3) Click [YES]: initiate the download and install of the update. version
(4) Click [Check Now]: move to “About This TV” page for (3) Click [DOWNLOAD AND INSTALL]
update. (4) TV is updating
(5) TV is updating.
(5) After finished the update, below Pop-up appear
(6) After finished the update, below Pop-up appear.
(6) Turn OFF the TV and On. Check the updated SW Version
and Tool Option
(7) Click [Yes] : TV will be DC OFF -> ON
(8) After TV turned on, Check the updated SW Version and
Tool Option.
- 10 - Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
X_TAL DDR3 2133 X 16
24MHz (512MB X 2EA)
Tuner
Tuner : I2C 5 IF (+/-)
R DDR3 2133 X 16
E (512MB X 2EA)
D-Demod : I2C 2 P_TS
A
R
CVBS/SIF
(H)
1. SOC Block Diagram
SYSTEM EEPROM
(256Kb)
USB1 (3.0) OCP MainSOC eMMC
S 1.5A (4GB)
I
HDMI1 (2.0)
D
E HDMI2 (2.0)
(ARC)
OCP
USB2 (2.0) 1.5A
OCP
USB3 (2.0) 1.5A I2S Out
Audio 2 AMP
- 11 -
HDMI3 (2.0)
HDMI4 (2.0)
R
E BLUTOOTH
A HP
BLOCK DIAGRAM
R H/P WIFI
Copyright ©
AMP
AV SUB
ASSY
COMP IR / KEY/EYE
Component/AV Spec. out In Europe IR
Component Spec Out In North America OPTIC SPDIF OUT I2C
KEY
LAN
Sub Micom
Only for training and service purposes.
X_TAL
32.768kHz
LG Electronics. Inc. All rights reserved.
TUNER +3.3V_TUNER
CI Slot
2. Tuner + CI
[+3.3V_LNA_TU] 3 +1.2V_Demod_Core
PCM_5V_CTL CI 5V +5V_CI_ON
[+3.3V_TUNER] 11 VCC
Power detect
+3.3V_TUNER
MAIN
+5V_CI_ON +3.3V_NORMAL
[D_Demod_Core] 13 SOC
1.2Kȳ C25 [CAM_VCCEN_N]
[I2C_SCL5_TU] 1 I2C_SCL5 10K ȳ 47K ȳ
33 ȳ AH25[SCL5] C23[CAM_CD1_N] /CI_CD1,2
[I2C_SDA5_TU] 2 I2C_SDA5 AH26[SDA5] B23[CAM_CD2_N] /CI_CD1,2
G28[TPI_VAL]
CI_TS_VAL CI_TS_VAL
[FE_DEMOD1_TS_ERROR_TU] 14 FE_DEMOD1_TS_ERROR
/PCM_CE1.2
[FE_DEMOD1_1_TS_CLK] 15 AC29 [TP_DVB_CLK] B25[CAM_CE1_N] /PCM_CE1.2
FE_DEMOD1_TS_CLK AC30 [TP_DVB_SOP] B26[CAM_CE2_N]
[FE_DEMOD1_TS_SYNC] 16
[FE_DEMOD1_TS_VAL] 17 FE_DEMOD1_TS_SYNC AB30 [TP_DVB_VAL]
FE_DEMOD1_TS_VAL /PCM_IOWR
B29 [EB_BE_N1] /PCM_IOWR
E28 [EB_EB_N0]
/PCM_IORD
/PCM_IORD
CI_ADDR[0-14]
- 12 -
FE_DEMOD1_TS_DATA[0] 18 [EB_ADDR_0~14] CI_ADDR[0-14]
AB28 [TP_DVB_DATA0]
FE_DEMOD1_TS_DATA[1] 19
AC28 [TP_DVB_DATA1] CI_TS_DATA[0-7]
FE_DEMOD1_TS_DATA[2] 20
FE_DEMOD1_TS_DATA [0-7] AD28 [TP_DVB_DATA2] [EB_DATA_0~7] CI_DAT[0-7]
FE_DEMOD1_TS_DATA[3] 21
AD29 [TP_DVB_DATA3]
FE_DEMOD1_TS_DATA[4] 22
AE29 [TP_DVB_DATA4] PCM_RESET
FE_DEMOD1_TS_DATA[5] 23 A24[CAM_RESET] PCM_RESET
AE30 [TP_DVB_DATA5]
FE_DEMOD1_TS_DATA[6] 24 /PCM_WAIT
AF29 [TP_DVB_DATA6] C24[CAM_WAIT_N] /PCM_WAIT
FE_DEMOD1_TS_DATA[7] 25
AF30 [TP_DVB_DATA7] PCM_INPACK
Copyright ©
PCM_INPACK
A25[CAM_REG_N]
/PCM_REG /PCM_REG
/PCM_IRQA /PCM_IRQA
/TU_RESET1 B24[CAM_IREQ_N]
[/TU_RESET1_TU] 10 AK14 [GPIO26] /PCM_OE
A32 [EB_OE_N] /PCM_OE
/PCM_WE
D28 [EB_WE_N] /PCM_WE
IF_P ADC_I_INP
[IF_P] 7 AN31 [DMD_ADC_INP] CI_IN_TS_CLK
FILTER P30 [TPO_CLK] CI_IN_TS_CLK
IF_N ADC_I_INN CI_IN_TS_VAL
[IF_N] 8 AN32 [DMD_ADC_INN]
P29 [TPO_VAL] CI_IN_TS_VAL
CI_IN_TS_SYNC
N29 [TPO_SOP] CI_IN_TS_SYNC
Only for training and service purposes.
TPI_DATA [0-7] CI_TS_DATA[0-7]
IF_AGC [TPI_DATA 0~7] 100 ȳ CI_TS_DATA[0~7]
[IF_AGC_TU] 5 AL31[IF_AGC]
TPO_DATA[0-7] CI_IN_TS_DATA[0-7]
[TPO_DATA[ 0~7] 33 ȳ CI_IN_TS_DATA[0-7]
LG Electronics. Inc. All rights reserved.
A 1
AV
AV1 Jack Side SOC Side
ACK
Phone JACK MAIN SOC
AV_CVBS_IN AV1_CVBS_IN_SOC
AM24 [CVBS_IN2]
Component/AV Spec. out In Europe
Component Spec Out In North America
AL18 [AUAD_L_CH2_IN
COMP2/AV_L_IN AUAD_L_CH2_IN AM18 [AUAD_R_CH2_IN]
COMP2/AV_R_IN AUAD_R_CH2_IN
Component 1
Phone JACK COMP2_SOG2_IN_SOC
COMP2_Y_IN_SOC AM20 [SOY1_IN]
AN20 [Y1_IN]
3. Video & Audio IN/OUT
COMP2_Pb_IN_SOC
COMP2_Pb AL21 [PB1_IN]
COMP2_Pr_IN_SOC
COMP2_Y AM22 [PR1_IN]
COMP2_Pr
Front Speaker
Audio [SCK]
AMP [LRCK] I2S
[DACLRCH]
NTP7515
[I2C_SCL_0/SDA_0]
- 13 -
AMP_RESET
[GPIO23]
Woofer Speaker
Audio
AMP
NTP7515
Copyright ©
AMP_MUTE MICOM
(WOOFER_MUTE)
SPDIF OUT
SPDIF_OUT
AM14 [IEC958OUT]
ARC OUT
(HDMI2) SPDIF_OUT_ARC
Only for training and service purposes.
[PHY0_ARC_OUT]
H/P JACK HP_LOUT_JACK
HP_ROUT_JACK HP AMP AL15 [AUDA_OUTL]
TPA6138 AM15 [AUDA_OUTR]
LG Electronics. Inc. All rights reserved.
MICOM MAIN SOC 4. HDMI 2.0
CEC_REMOTE
+5V
Port_1
HDMI 1 [HDMI2_3_SDA]
DDC_I2C_1 HDMI2.0 HDCP1.4
(2.0)_V [HDMI2_3_SCL]
LGE PHY HDCP2.2
HDMI_HPD_1
[HDMI2_3_HPD]
CEC_REMOTE
+5V
HDMI 2 Port_2
[HDMI2_2_SDA]
(2.0)_V DDC_I2C_2 HDMI2.0 HDCP1.4
[HDMI2_2_SCL]
ARC LGE PHY HDCP2.2
HDMI_HPD_2
[HDMI2_2_HPD]
SPDIF_OUT_ARC
- 14 -
CEC_REMOTE
+5V
Port_3
HDMI 3 [HDMI2_1_SDA]
DDC_I2C_3 HDMI2.0 HDCP1.4
(2.0)_H [HDMI2_1_SCL]
LGE PHY HDCP2.2
HDMI_HPD_3
[HDMI2_1_HPD]
Copyright ©
SPDIF_OUT_ARC
[PHY0_ARC_OUT]
CEC_REMOTE
+5V
Port_4
HDMI 4 [HDMI2_0_SDA]
(2.0)_H DDC_I2C_4 HDMI2.0 HDCP1.4
[HDMI2_0_SCL]
LGE PHY HDCP 2.2
HDMI_HPD_4
[HDMI2_0_HPD]
Only for training and service purposes.
LG Electronics. Inc. All rights reserved.
MAN SOC
USB3.0_1_TX_DP0 / DM0
[USB3_0_DP0 / DM0] USB3.0_1_RX_DP0 / DM0
[USB3_0_TX0_P / M] USB3.0_1_DP0 / DM0 +5V_USB_1 USB 1
[USB3_0_RX0_P / M] (3.0)_V
USB_CTL1
[GPIO90] OCP
USB2.0_2_DP1 / DM1 +5V_USB_2 USB 2
[USB2_1_DP0 / DM0]
USB_CTL2 (2.0)_H
[GPIO95] OCP
USB2.0_3_DP0 / DM0 +5V_USB_3
[USB2_0_DP0 / DM0] USB 3
USB_CTL3 (2.0)_H
[GPIO34] OCP
5. USB / Wi-Fi / M-Remote / UART
WIFI_DP / DM IR + Wi-Fi /BT
[USB2_2_DP0 / DM0] Wafer 25P
- 15 -
+3.5V_WIFI
WIFI_EN
MICOM
WOL/WIFI_POWER_ON
Copyright ©
SOC_RX/TX
SOC_RX/TX UART wafer
[UART0_RXD/GPIO106] (*) US model only
SOC_RX/TX
RS232 IC
Only for training and service purposes.
[UART0_TXD/GPIO105]
JK6200
UART1_RX/TX RS232C phone Jack
[UART1_RXD / TXD] Debug Wafer
LG Electronics. Inc. All rights reserved.
Cap Ready
6. I2C Map
MAIN SOC
+3.3V_NORMAL
AUDIO AMP 100 ˟
33pF +3.3V_TU
ZUZr˟
I2C_SCL0: AK23[SCL0] ZZ˟ LNB
AUDIO AMP 100 ˟
I2C_SDA0: AJ23[SDA0] YU^r˟
33pF
I2C_SCL3: AH24[SCL3] ZZ˟ TUNER (Demod)
+3.3V_NORMAL I2C_SDA3: AJ24[SDA3]
18pF
ZUZr˟
+3.3V_NORMAL
I2C_SCL1: AK22[SCL1]
- 16 -
MICOM
I2C_SDA1: AJ22[SDA1]
ZUZr˟
EYE_I2C_SDA ZUZr˟ +3.5V_ST
EYE_I2C_SCL XWW˟ +3.3V_NORMAL I2C_SCL4: AJ21[SCL4]
ZZ˟ NVRAM
I2C_SDA4: AH21[SDA4]
Copyright ©
IR / KEY/EYE
+3.3V_TU
ZUZr˟
I2C_SCL2: AH23[SCL2]
PMIC (EPI) 33 ˟ XUYr˟GOl|P
I2C_SDA2: AH22[SDA2]
WAFER (Vx1)
I2C_SCL5: AH25[SCL5]
ZZ˟
Only for training and service purposes.
I2C_SDA5: AH26[SDA5] Tuner
47pF
LG Electronics. Inc. All rights reserved.
PANEL_VCC
60P EPI Output
EO, GCLK, RIGHT
I2C_2 MCLK, GST
M16p
P-gamma
(8CH)
VCC, HVDD,
VGH, VEPI, VDD, VEPI, Vterm,
7. EPI block (PMIC)
VCOM1FB/ PMIC VGL2, VCOM1,2 HVDD, VCOM1,2,
VCOM2FB VGL1,2, VGH
VST, RESET, VST, RESET, VGH_E/O
VGH_E/O
VCOM1FB
EO, GCLK, [TX_LOCKN]
P-GAMMA Voltage Level shifter
8 CH OUTPUT CLK[1:8] MCLK, GST
LOCK_IN
LOCK
CK_IN
[OUT4P]
: EPI 6 Lane CLK[1:8]
[OUT9N]
MAIN
- 17 -
SOC [OUT12P]
: EPI 6 Lane
[OUT17N] CLK[1:8]
Copyright ©
PANEL_VCC
VCOM2FB
VST, RESET, VGH_E/O
Sub VDD, Vterm
PMIC VDD, VEPI, Vterm,
HVDD, VCOM1,2,
Only for training and service purposes.
VGL1,2, VGH
P-gamma
(8CH) 60
60P
0 EPI Output
LEFT
LG Electronics. Inc. All rights reserved.
EXPLODED VIEW
IMPORTANT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These
parts are identified by in the EXPLODED VIEW.
It is essential that these special safety parts should be replaced with the same components as
recommended in this manual to prevent Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
910
400
900
800
120
521
121
540
LV2
571
530
LV1
570
820
500
700
200A
A10
200
AR2A9
- 18 - Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
DISASSEMBLY GUIDE
1. After Screw Disassemble, please remove B/C from Module
49"-Screw : 15 ea
1 1 1 1 1
1 1
1
2
1 1 1 1
1 1
55"-Screw : 17 ea
1 1 1 1 1
f f f f f
1 1
f f ff
1
1 1
2
1 1
1 1
1 1
- 19 - Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
2. Detach Tape
Detach tape
3. Remove all sort of cable
- 20 - Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
4. IR assy, WiFi PCB assy disassembly
Disassemble screw (1ea) and
Remove wi-fi cable
Remove IR cable and
Disassemble 3
Latch (1ea)
5. Screw disassembly
-Screw : 9 ea
3 3 3
3
3
3 3 3 3
- 21 - Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
6. Speaker disassembly
7. Screw disassembly
-Screw : 4 ea
3 3 3
3 3
- 22 - Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
TROUBLE SHOOTING GUIDE
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Contents of Standard Repair Process
No. Error symptom (High category) Error symptom (Mid category) Page Remarks
1 No video/Normal audio 1
2 No video/No audio 2
3 A. Video error Picture broken/ Freezing 3
4 Color error 4
Vertical/Horizontal bar, residual image,
5 5
light spot, external device color error
6 No power 6
B. Power error Off when on, off while viewing, power
7 7
auto on/off
8 No audio/Normal video 8
C. Audio error
9 Wrecked audio/discontinuation/noise 9
10 Remote control & Local switch checking 10
11 MR15 operating checking 11
12 D. Function error Wifi operating checking 12
13 Camera operating checking 13
14 External device recognition error 14
15 E. Noise Circuit noise, mechanical noise 15
16 F. Exterior error Exterior defect 16
First of all, Check whether there is SVC Bulletin in GSCS System for these model.
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process
Established
Error
A. Video error date
symptom No video/ Normal audio Revised date 1/16
First of all, Check whether all of cables between board is inserted properly or not.
(Main B/D↔ Power B/D, LVDS or EPI Cable, Speaker Cable, IR B/D Cable,,,)
☞A1 ☞A18
No video Normal Y Check Back Light Y Check Power Normal Y Replace T-con/Main
Normal audio On Board or module
audio On with naked eye Board voltage
13.2V etc.
N N N
Move to No
☞A18 Check Power Board 13.2V output Repair Power
video/No audio Board or parts
Replace Inverter
Normal Y
or module
voltage
N End
Repair Power
Board or parts
※Precaution ☞A4 & A2
Always check & record S/W Version and White
Replace Main Board Re-enter White Balance value
Balance value before replacing the Main Board
1
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process
Established
Error A. Video error date
symptom
No video/ No audio Revised date 2/16
☞A18
Check various Check and
No Video/ voltages of Power Normal Y
replace
No audio Board (13.2V…) voltage?
MAIN B/D
N
End
Replace Power
Board and repair
parts
2
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process
Established
Error A. Video error date
symptom
Picture broken/ Freezing Revised date 3/16
. By using Digital signal level meter
☞ A3
. By using Diagnostics menu on OSD
Check RF Signal level ( Advanced→ Channels→ Channel Tuning→ Manual Tuning → Check the Signal )
- Signal strength (Normal : over 50%)
- Signal Quality (Normal: over 50%)
Check whether other equipments have problem or not.
Normal Y
(By connecting RF Cable at other equipment)
Signal?
→ DVD Player ,Set-Top-Box, Different maker TV etc`
N
☞ A4
Check RF Cable
Connection Normal Y Check SVC N Check Y
Close
1. Reconnection Picture? S/W Version Bulletin? Tuner soldering
2. Install Booster
N Y N
S/W Upgrade
Normal N Contact with signal distributor
Picture? or broadcaster (Cable or Air)
Normal N
Y Picture? Replace
Main B/D
Y
Close
Close
3
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process
Established
Error A. Video error date
symptom
Color error Revised date 4/16
☞A6 ☞ A7
※ Check
Check color by input
and replace
-External Input
Color Y Link Cable Color Y Color Y
-COMPONENT Replace Main B/D Replace module
error? (EPI or Vx1 error? error?
-AV
Cable) and
-HDMI
N contact N N
condition
Check error color End
input mode
☞A8 Check
External Input/
external External device Y
Check Test pattern Component Replace Main/T-con B/D
device and /Cable normal
error
cable
N
Request repair
for external
device/cable
N
Check external
HDMI External device Y
device and Replace Main/T-con B/D
error /Cable normal
cable
4
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process
A. Video error Established
Error date
symptom Vertical / Horizontal bar, residual image,
light spot, external device color error Revised date 5/16
Vertical/Horizontal bar, residual image, light spot Replace
Module
☞A6
☞ A7 N
Check color condition by input Check external
-External Input Check and
Screen Y device Y Screen N Screen
-Component Normal? replace Link Replace Main/T-con B/D
normal? connection normal? normal?
-HDMI Cable
condition
N N Y For LGD panel Y
Replace Main B/D
Replace Request repair End End
module for external
☞A8 device
Check Test pattern
For other panel
External device screen error-Color error
Check screen
condition by input
-External Input External
Check S/W Version Check N
-Component Input Connect other external
version
-HDMI/DVI error device and cable Screen N Replace
Y (Check normal operation of normal? Main/T-con
External Input, Component, B/D
Component RGB and HDMI/DVI by Y
S/W Upgrade error connecting Jig, pattern
Generator ,Set-top Box etc.
Request repair for
external device
Y
Connect other external
Normal N HDMI/
device and cable
screen? DVI
(Check normal operation of Screen N Replace
External Input, Component, normal? Main /T-con
Y RGB and HDMI/DVI by B/D
connecting Jig, pattern
Generator ,Set-top Box etc.
End
5
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process
Established
Error B. Power error date
symptom
No power Revised date 6/16
☞A17 ☞A18
DC Power on Replace
Check Power LED Y Normal N Check Power Y
by pressing Power Key OK? Power
Logo LED On? operation? On ‘”High”
On Remote control B/D
. Stand-By: Red or Turn On
N Y
. Operating: Turn Off
Check Power cord Replace Main B/D
was inserted properly
☞A18
N Measure voltage of each output of Power B/D
Normal?
Y
Y Y
Normal Replace Main B/D
voltage?
Close Normal
Check ST-BY 3.5V
Y
voltage? N
☞A18 Replace Power B/D
N
Replace Power
B/D
6
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process
Established
Error B. Power error date
symptom
Off when on, off while viewing, power auto on/off Revised date 7/16
Check outlet
☞A19
N Y
Check A/C cord Error? Check Power Off CPU
Replace Main B/D Normal? End
Mode Abnormal
Y N
Check for all 3- phase
power out Abnormal Replace Power B/D
1
Fix A/C cord & Outlet ☞A18
and check each 3
(If Power Off mode
phase out
is not displayed) Normal Y
Replace Main B/D
Check Power B/D voltage?
voltage
N
※ Caution
Check and fix exterior Replace Power B/D
of Power B/D Part
* Please refer to the all cases which Status Power off List Explanation
"POWEROFF_REMOTEKEY" Power off by REMOTE CONTROL
can be displayed on power off mode.
"POWEROFF_OFFTIMER" Power off by OFF TIMER
"POWEROFF_SLEEPTIMER" Power off by SLEEP TIMER
"POWEROFF_INSTOP" Power off by INSTOP KEY
"POWEROFF_AUTOOFF" Power off by AUTO OFF
Normal "POWEROFF_ONTIMER" Power off by ON TIMER
"POWEROFF_RS232C" Power off by RS232C
"POWEROFF_RESREC" Power off by Reservated Record
"POWEROFF_RECEND" Power off by End of Recording
"POWEROFF_SWDOWN" Power off by S/W Download
"POWEROFF_UNKNOWN" Power off by unknown status except listed case
"POWEROFF_ABNORMAL1" Power off by abnormal status except CPU trouble
Abnormal
"POWEROFF_CPUABNORMAL" Power off by CPU Abnormal
7
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process
Established
Error C. Audio error date
symptom
No audio/ Normal video Revised date 8/16
☞A20 ☞A21+A18
Check user N Check audio
No audio Normal Y
menu > Off 13.2V of Power
Screen normal voltage
Speaker off Board
Y N
Cancel OFF Replace Power Board and repair parts
Check N
Disconnection Replace MAIN Board End
Speaker
disconnection
Y
Replace Speaker
8
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process
Established
Error C. Audio error date
symptom
Wrecked audio/ discontinuation/noise Revised date 9/16
→ abnormal audio/discontinuation/noise is same after “Check input signal” compared to No audio
Wrecked audio/
☞A21+A18
Check and replace
Discontinuation/ Check audio
speaker and
Noise for B+ Voltage (13.2V)
connector
Check input all audio
signal Y
Signal
-RF
normal? Wrecked audio/
-External Input Normal Y
signal Discontinuation/
Replace Main B/D voltage?
Noise only
N for D-TV
N
Wrecked audio/
Discontinuation/
Replace Power B/D
Noise only
for Analog
(When RF signal is not received)
Request repair to external
cable/ANT provider Wrecked audio/ Replace Main B/D End
Discontinuation/
Noise only
for External Input
(In case of External Input
signal error) Connect and check Normal N
Check and fix external device other external audio?
device
Y
Check and fix external device
9
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process
D. Function error Established
Error date
symptom
Remote control & Local switch checking Revised date 10/16
1. Remote control(R/C) operating error Replace
Main B/D
☞A22 ☞A22 ☞A22
Check & Repair N
Check R/C itself Normal Y Normal Check B+3.5V Normal Y Check IR Normal Y
operating? Cable connection operating? Voltage? Signal?
Operation On Main B/D Output signal
Connector solder
N Y N N
☞A18
Check R/C Operating Check & Replace Close Check 3.5v on Power B/D Repair/Replace
When turn off light Baterry of R/C Replace Power B/D or IR B/D
in room Replace Main B/D
(Power B/D don’t have problem)
If R/C operate, Normal Y
operating? Close
Explain the customer
cause is interference
from light in room. N
Replace R/C
10
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process
D. Function error Established
Error date
symptom
MR13 operating checking Revised date 11/16
2. MR15(Magic Remocon) operating error
☞A4
Check the RF Receiver ver N Check MR15 Normal Y Turn off/on the
Press the Is show ok N
INSTART menu is “00.00”? itself Operation operating? set and press
wheel message?
the wheel
N Y
Y
☞A23
Check & Replace Close
Check & Repair Battery of MR15
RF assy
connection
Normal Y
☞A4 operating? Close
Is show ok N Press the back
RF Receiver ver N N message? key about 5sec
Close
is “00.00”?
Y
Replace
Y MR13
Close
Down load the Firmware
* If you conduct the loop at 3times, change the M4.
* INSTART MENU14.RF
Remocon Test3. Firmware
download
11
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process
D. Function error Established
Error date
symptom
Wifi operating checking Revised date 12/16
3.Wifi operating error
☞A4 ☞A24
Check the Wi-Fi Mac value N Check the Wifi wafer Normal N Replace
INSTART menu is “NG”? Voltage?
1pin Main B/D
Y
Y
☞A24
Close
Check & Repair
Wifi cable
connection
☞A4
Wi-Fi Mac value N
is “NG”? Close
Y
Change the Wifi assy
12
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process
D. Function error Established
Error date
symptom
Camera operating checking Revised date 13/16
4.Camera operating error
☞A4 ☞A25
Check the Camera Ver. N Reconnect the Normal N Replace
INSTART menu is “NULL”? operation?
Camera module Main B/D
Y
Y
Close
Change the
Camera module
13
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process
Established
Error D. Function error date
symptom
External device recognition error Revised date 14/16
Check technical
Check Y External Input and
Signal information Technical N
input Component Replace Main B/D
input? - Fix information information?
Recognition error
signal
- S/W Version
N Y
HDMI/
Check and fix DVI, Optical
Fix in Replace Main B/D
external device/cable Recognition error
accordance
with technical
information
14
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process
Established
Error E. Noise date
symptom
Circuit noise, mechanical noise Revised date 15/16
Identify Check
Circuit
nose location of Replace PSU
noise
type noise
Mechanical Check location of
noise noise
※ When the nose is severe, replace the module
※ Mechanical noise is a natural (For models with fix information, upgrade the
phenomenon, and apply the 1st level S/W or provide the description)
description. When the customer does not OR
agree, apply the process by stage. ※ If there is a “Tak Tak” noise from the
※ Describe the basis of the description cabinet, refer to the KMS fix information and
in “Part related to nose” in the Owner’s then proceed as shown in the solution manual
Manual. (For models without any fix information,
provide the description)
15
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process
Established
Error F. Exterior defect date
symptom
Exterior defect Revised date 16/16
Zoom part with Module
Replace module
exterior damage damage
Cabinet
Replace cabinet
damage
Remote
control Replace remote control
damage
Stand
Replace stand
dent
16
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Contents of Standard Repair Process Detail Technical Manual
No. Error symptom Content Page Remarks
1 A. Video error_ No video/Normal Check LCD back light with naked eye A1
2 audio Check White Balance value A2
TUNER input signal strength checking
3 A3
method
A. Video error_ video error /Video
4 lag/stop Version checking method A4
5 Tuner Checking Part A5
A. Video error _Vertical/Horizontal bar,
6 Connection diagram A6
residual image, light spot
Check Link Cable (Vx1/EPI) reconnection
7 A7
A. Video error_ Color error condition
8 Adjustment Test pattern - ADJ Key A8
9 Exchange Main Board (1) A-1/5
10 Exchange Main Board (2) A-2/5
11 Defected Type caused by T-Con/ Exchange Power Board (PSU) A-3/5
Inverter/ Module
12 Exchange Module (1) A-4/5
13 Exchange Module (2) A-5/5
Continue to the next page
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Contents of Standard Repair Process Detail Technical Manual
Continued from previous page
No. Error symptom Content Page Remarks
14 Check front display LED A9
B. Power error_ No power
15 Check power input Voltage & ST-BY 3.5V A10
B. Power error_Off when on, off
16 POWER OFF MODE checking method A11
while viewing
Checking method in menu when there is
17 A12
C. Audio error_ No audio/Normal no audio
video Voltage and speaker checking method
18 A13
when there is no audio
Remote control operation checking
19 A14
method
D. Function error
Motion Remote operation checking
20 A15
method
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process Detail Technical Manual
Error Established
symptom A. Video error_No video/Normal audio date
Revised
Content Check LCD back light with naked eye date A1
<49SJ81>
After turning on the power and disassembling the case, check with the naked eye,
whether you can see light from locations.
A1
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process Detail Technical Manual
Error Established
symptom A. Video error_No video/Normal audio date
Revised
Content Check LCD back light with naked eye A1
date
<55SJ81>
Attach the tape with pull speaker cable at most.
1
After turning on the power and disassembling the case, check with the naked eye,
whether you can see light from locations.
A1
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process Detail Technical Manual
Error Established
symptom A. Video error_No video/Normal audio date
Revised
Content Check LCD back light with naked eye A1
date
<60SJ81>
After turning on the power and disassembling the case, check with the naked eye,
whether you can see light from locations.
A1
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process Detail Technical Manual
Error Established
symptom A. Video error_No video/Normal audio date
Revised
Content Check LCD back light with naked eye A1
date
<65SJ81>
After turning on the power and disassembling the case, check with the naked eye,
whether you can see light from locations.
A1
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process Detail Technical Manual
Error Established
symptom A. Video error_No video/Normal audio date
Revised
Content Check White Balance value A2
date
Entry method
1. Press the ADJ button on the remote control for adjustment.
2. Enter into White Balance of item 10.
3. After recording the R, G, B (GAIN, Cut) value of Color Temp
(Cool/Medium/Warm), re-enter the value after replacing the MAIN BOARD.
A2
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process Detail Technical Manual
Error Established
symptom A. Video error_Video error, video lag/stop date
Revised
Content TUNER input signal strength checking method date A3
Advanced Channels Channel Tuning Manual Tuning
When the signal is strong,
use the attenuator (-10dB, -
15dB, -20dB etc.)
A3
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process Detail Technical Manual
Error Established
symptom A. Video error_Video error, video lag/stop date
Revised
Content Version checking method date A4
1. Checking method for remote control for adjustment
Version
v
Press the IN-START with the remote
control for adjustment
A4
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process Detail Technical Manual
Error Established
symptom
A. Video error_Video error, video lag/stop
date
TUNER checking part Revised
Content date A5
<49”55”> <60”65”>
Checking method:
1. Check the signal strength or check whether the screen is normal when the external device is connected.
2. After measuring each voltage from power supply, finally replace the MAIN BOARD.
A5
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process Detail Technical Manual
Error A. Video error _Vertical/Horizontal bar, Established
symptom residual image, light spot date
Revised
Content Connection diagram (1) date A6
As the part connecting to the external input, check
the screen condition by signal
A6
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process Detail Technical Manual
Error Established
symptom A. Video error_Color error date
Revised
Content Check Link Cable(VX1/EPI) reconnection condition date A7
<49”55”> <60”65”>
Check the contact condition of the Link Cable, especially dust or mis insertion.
A7
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process Detail Technical Manual
Error Established
symptom
A. Video error_Color error
date
Adjustment Test pattern - ADJ Key Revised
Content date A8
You can view 6 types of patterns using the ADJ Key
Checking item : 1. Defective pixel 2. Residual image 3. MODULE error (ADD-BAR,SCAN BAR..)
4.Video error (Classification of MODULE or Main-B/D!)
A8
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Appendix : Exchange Main Board (1)
Solder defect, CNT Broken Solder defect, CNT Broken Solder defect, CNT Broken
Solder defect, CNT Broken T-Con
T-Con Defect,
Defect,
Solder
T-Con CNT
CNT
defect,CNT
Defect, Broken
Broken
CNTBroken
Broken Abnormal Power Section
Solder defect, Short/Crack Abnormal Power Section Solder defect, Short/Crack
A - 1/5
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Appendix : Exchange Main Board (2)
Abnormal Power Section Abnormal Power Section Solder defect, Short/Crack
Solder defect, Short/Crack Fuse Open, Abnormal power section Abnormal Display
GRADATION Noise GRADATION
A - 2/5
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Appendix : Exchange Power Board (PSU)
No Light Dim Light
Dim Light Dim Light
No picture/Sound Ok
A - 3/5
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Appendix : Exchange the Module (1)
Press damage Press damage Press damage
Crosstalk Crosstalk
Un-repairable Cases
In this case please exchange the module.
A - 4/5
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Appendix : Exchange the Module (2)
Vertical Block Vertical Line Vertical Block
Source TAB IC Defect Source TAB IC Defect Source TAB IC Defect
Horizontal
TAB ICBlock
Horizontal Block Horizontal line
Gate Defect Gate TAB IC Defect
Gate TAB IC Defect Gate TAB IC Defect Gate TAB IC Defect
Un-repairable Cases
In this case please exchange the module.
Horizontal Block
Gate TAB IC Defect
Gate TAB IC Defect
A - 5/5
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process Detail Technical Manual
Error Established
symptom B. Power error _No power date
Revised
Content Check front Power Indicator date A9
ST-BY condition: On or Off
Power ON condition: Turn Off
A9
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process Detail Technical Manual
Error Established
symptom
B. Power error _No power
date
Revised
Content Check power input voltage and ST-BY 3.5V A10
date
<49”,55”> <60”,65”>
Check the DC 13.2V.
<49”55”>
A10
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process Detail Technical Manual
Error
symptom B. Power error _Off when on, off whiling viewing Established
date
Revised
Content POWER OFF MODE checking method date A11
Entry method
1. Press the IN-START button of the remote control for adjustment
2. Check the entry into adjustment item 3
A11
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process Detail Technical Manual
Error Established
symptom C. Audio error_No audio/Normal video
date
Revised
Content Checking method in menu when there is no audio date A12
Checking method
1. Press the Setting button on the remote control
2. Select the Sound function of the Menu
3. Select the Sound Out
4. Select TV Speaker
A12
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process Detail Technical Manual
Error Established
symptom C. Audio error_No audio/Normal video date
Voltage and speaker checking method Revised
Content date A13
when there is no audio
②
①
③ 1 SPK_R-FT
2 SPK_R+FT
Checking order when there is no audio 3 SPK_L-FT
4 SPK_L+FT
1.Check the contact condition of or 13.2V connector of Main Board
2. Measure the 13.2V input voltage supplied from Power Board
(If there is no input voltage, remove and check the connector)
3.Connect the tester RX1 to the speaker terminal and if you hear the Chik Chik sound when you touch the
GND and output terminal, the speaker is normal.
A13
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process Detail Technical Manual
Error Established
symptom D. Function error date
Revised
Content Remote control operation checking method date A14
Pin Pin name
1 VCC
① 2 USB_DM
IR & EYE Sensor 3 USB_DP
4 GND
5 WOL/WIFI_ON
6 VCC
7 COMBO_RESET
8 GND
9 BT_WAKEUP_DEVICE
10 BT_WAKEUP_HOST
IR & LOGO light Rear 11 GND
12 GND
13
14
15
16 EYE_SDA
IR LED Eye 17 EYE_SCL
18 GND
③
19 IR
20 LED_R
② 21 GND
Checking order to check remote control 22 VCC
23 KEY2
24 KEY1
Checking order
25 GND
1.Check IR cable condition between IR & Main board.( Check picture number① and ②)
2.Check the standby 3.5V on the terminal 16 pin (③)
3.AS checking the Pre-Amp(IR LED light) , the power is in ON condition, an Analog Tester
needle should move slowly, otherwise, it’s defective.
A14
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Standard Repair Process Detail Technical Manual
Error Established
symptom D. Function error date
Revised
Content Remote control operation checking method date A15
Pin Pin name
1 VCC
① Wifi & BT Front 2 USB_DM
3 USB_DP
4 GND
5 WOL/WIFI_ON
6 VCC
7 COMBO_RESET
8 GND
9 BT_WAKEUP_DEVICE
10 BT_WAKEUP_HOST
11 GND
Wifi & BT Rear 12 GND
13
14
15
16 EYE_SDA
17 EYE_SCL
③ 18 GND
19 IR
20 LED_R
② 21 GND
22 VCC
Checking order to check motion remote/wifi 23 KEY2
24 KEY1
Checking order 25 GND
1.Check BT/Wifi cable condition between BT/Wifi assy & Main board.
2.Check the 3.5V on the terminal 22
A15
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
