LG OLED55C9PTA User manual

P/NO : MFL70442902 (1902-REV00)
CHASSIS : EB91E
MODEL : OLED55C9PTA / PVA
OLED65C9PTA / PVA
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
OLED TV
SERVICE MANUAL
CONFIDENTIAL
Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes.

- 2 - Copyright © 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 .................................................................................. 17
DISASSEMBLY GUIDE........................................................................... 18
TROUBLE SHOOTING GUIDE ................................................ APPENDIX

- 3 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
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
An isolation Transformer should always be used during the
servicing of a receiver whose chassis is not isolated from the AC
power line. Use a transformer of adequate power rating as this
protects the technician from accidents resulting in personal injury
from electrical shocks.
It will also protect the receiver and it's components from being
damaged by accidental shorts of the circuitry that may be
inadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this TV receiver is blown,
replace it with the specified.
When replacing a high wattage resistor (Oxide Metal Film Resistor,
over 1 W), keep the resistor 10 mm away from PCB.
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 MΩand 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.
Leakage Current Hot Check (See below Figure)
Plug the AC cord directly into the AC outlet.
Do not use a line Isolation Transformer during this check.
Connect 1.5 K / 10 watt resistor in parallel with a 0.15 uF capacitor
between a known good earth ground (Water Pipe, Conduit, etc.)
and the exposed metallic parts.
Measure the AC voltage across the resistor using AC voltmeter
with 1000 ohms/volt or more sensitivity.
Reverse plug the AC cord into the AC outlet and repeat AC voltage
measurements for each exposed metallic part. Any voltage
measured must not exceed 0.75 volt RMS which is corresponds to
0.5 mA.
In case any measurement is out of the limits specified, there is
possibility of shock hazard and the set must be checked and
repaired before it is returned to the customer.
Leakage Current Hot Check circuit
IMPORTANT SAFETY NOTICE
SAFETY PRECAUTIONS

- 4 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
SERVICING PRECAUTIONS
CAUTION: Before servicing receivers covered by this service
manual and its supplements and addenda, read and follow the
SAFETY PRECAUTIONS on page 3 of this publication.
NOTE: If unforeseen circumstances create conict between the
following servicing precautions and any of the safety precautions
on page 3 of this publication, always follow the safety precau-
tions. Remember: Safety First.
General Servicing Precautions
1. Always unplug the receiver AC power cord from the AC power
source before;
a. Removing or reinstalling any component, circuit board
module or any other receiver assembly.
b. Disconnecting or reconnecting any receiver electrical plug
or other electrical connection.
c. Connecting a test substitute in parallel with an electrolytic
capacitor in the receiver.
CAUTION: A wrong part substitution or incorrect polarity
installation of electrolytic capacitors may result in an explo-
sion hazard.
2. Test high voltage only by measuring it with an appropriate
high voltage meter or other voltage measuring device (DVM,
FETVOM, etc) equipped with a suitable high voltage probe.
Do not test high voltage by "drawing an arc".
3. Do not spray chemicals on or near this receiver or any of its
assemblies.
4. Unless specied otherwise in this service manual, clean
electrical contacts only by applying the following mixture to the
contacts with a pipe cleaner, cotton-tipped stick or comparable
non-abrasive applicator; 10 % (by volume) Acetone and 90 %
(by volume) isopropyl alcohol (90 % - 99 % strength)
CAUTION: This is a ammable mixture.
Unless specied otherwise in this service manual, lubrication
of contacts in not required.
5. Do not defeat any plug/socket B+ voltage interlocks with which
receivers covered by this service manual might be equipped.
6. Do not apply AC power to this instrument and/or any of its
electrical assemblies unless all solid-state device heat sinks
are correctly installed.
7. Always connect the test receiver ground lead to the receiver
chassis ground before connecting the test receiver positive
lead.
Always remove the test receiver ground lead last.
8. Use with this receiver only the test xtures specied in this
service manual.
CAUTION: Do not connect the test xture ground strap to any
heat sink in this receiver.
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid-state) devices can be damaged eas-
ily by static electricity. Such components commonly are called
Electrostatically Sensitive (ES) Devices. Examples of typical ES
devices are integrated circuits and some eld-effect transistors
and semiconductor “chip” components. The following techniques
should be used to help reduce the incidence of component dam-
age caused by static by static electricity.
1. Immediately before handling any semiconductor component or
semiconductor-equipped assembly, drain off any electrostatic
charge on your body by touching a known earth ground. Alter-
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.
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 expo-
sure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder
ES devices.
4. Use only an anti-static type solder removal device. Some sol-
der removal devices not classied as “anti-static” can generate
electrical charges sufcient to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate
electrical charges sufcient 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 elec-
trically 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 mate-
rial 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 replace-
ment ES devices. (Otherwise harmless motion such as the
brushing together of your clothes fabric or the lifting of your
foot from a carpeted oor can generate static electricity suf-
cient to damage an ES device.)
General Soldering Guidelines
1. Use a grounded-tip, low-wattage soldering iron and appropri-
ate tip size and shape that will maintain tip temperature within
the range or 500 °F to 600 °F.
2. Use an appropriate gauge of RMA resin-core solder composed
of 60 parts tin/40 parts lead.
3. Keep the soldering iron tip clean and well tinned.
4. Thoroughly clean the surfaces to be soldered. Use a mall wire-
bristle (0.5 inch, or 1.25 cm) brush with a metal handle.
Do not use freon-propelled spray-on cleaners.
5. Use the following unsoldering technique
a. Allow the soldering iron tip to reach normal temperature.
(500 °F to 600 °F)
b. Heat the component lead until the solder melts.
c. Quickly draw the melted solder with an anti-static, suction-
type solder removal device or with solder braid.
CAUTION: Work quickly to avoid overheating the circuit
board printed foil.
6. Use the following soldering technique.
a. Allow the soldering iron tip to reach a normal temperature
(500 °F to 600 °F)
b. First, hold the soldering iron tip and solder the strand
against the component lead until the solder melts.
c. Quickly move the soldering iron tip to the junction of the
component lead and the printed circuit foil, and hold it there
only until the solder ows onto and around both the compo-
nent lead and the foil.
CAUTION: Work quickly to avoid overheating the circuit
board printed foil.
d. Closely inspect the solder area and remove any excess or
splashed solder with a small wire-bristle brush.

- 5 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
IC Remove/Replacement
Some chassis circuit boards have slotted holes (oblong) through
which the IC leads are inserted and then bent at against the cir-
cuit foil. When holes are the slotted type, the following technique
should be used to remove and replace the IC. When working with
boards using the familiar round hole, use the standard technique
as outlined in paragraphs 5 and 6 above.
Removal
1. Desolder and straighten each IC lead in one operation by
gently prying up on the lead with the soldering iron tip as the
solder melts.
2. Draw away the melted solder with an anti-static suction-type
solder removal device (or with solder braid) before removing
the IC.
Replacement
1. Carefully insert the replacement IC in the circuit board.
2. Carefully bend each IC lead against the circuit foil pad and
solder it.
3. Clean the soldered areas with a small wire-bristle brush.
(It is not necessary to reapply acrylic coating to the areas).
"Small-Signal" Discrete Transistor
Removal/Replacement
1. Remove the defective transistor by clipping its leads as close
as possible to the component body.
2. Bend into a "U" shape the end of each of three leads remain-
ing on the circuit board.
3. Bend into a "U" shape the replacement transistor leads.
4. Connect the replacement transistor leads to the corresponding
leads extending from the circuit board and crimp the "U" with
long nose pliers to insure metal to metal contact then solder
each connection.
Power Output, Transistor Device
Removal/Replacement
1. Heat and remove all solder from around the transistor leads.
2. Remove the h t sink mounting screw (if so equipped).
3. Carefully remove the transistor from the heat sink of the circuit
board.
4. Insert new transistor in the circuit board.
5. Solder each transistor lead, and clip off excess lead.
6. Replace heat sink.
Diode Removal/Replacement
1. Remove defective diode by clipping its leads as close as pos-
sible to diode body.
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.
3. Solder the connections.
CAUTION: Maintain original spacing between the replaced
component and adjacent components and the circuit board to
prevent excessive component temperatures.
Circuit Board Foil Repair
Excessive heat applied to the copper foil of any printed circuit
board will weaken the adhesive that bonds the foil to the circuit
board causing the foil to separate from or "lift-off" the board. The
following guidelines and procedures should be followed when-
ever this condition is encountered.
At IC Connections
To repair a defective copper pattern at IC connections use the
following procedure to install a jumper wire on the copper pattern
side of the circuit board. (Use this technique only on IC connec-
tions).
1. Carefully remove the damaged copper pattern with a sharp
knife. (Remove only as much copper as absolutely necessary).
2. carefully scratch away the solder resist and acrylic coating (if
used) from the end of the remaining copper pattern.
3. Bend a small "U" in one end of a small gauge jumper wire and
carefully crimp it around the IC pin. Solder the IC connection.
4. Route the jumper wire along the path of the out-away copper
pattern and let it overlap the previously scraped end of the
good copper pattern. Solder the overlapped area and clip off
any excess jumper wire.
At Other Connections
Use the following technique to repair the defective copper pattern
at connections other than IC Pins. This technique involves the
installation of a jumper wire on the component side of the circuit
board.
1. Remove the defective copper pattern with a sharp knife.
Remove at least 1/4 inch of copper, to ensure that a hazardous
condition will not exist if the jumper wire opens.
2. Trace along the copper pattern from both sides of the pattern
break and locate the nearest component that is directly con-
nected to the affected copper pattern.
3. Connect insulated 20-gauge jumper wire from the lead of the
nearest component on one side of the pattern break to the
lead of the nearest component on the other side.
Carefully crimp and solder the connections.
CAUTION: Be sure the insulated jumper wire is dressed so the
it does not touch components or sharp edges.

- 6 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement .
1. Application range
This specification is applied to the LED TV used EB91E
chassis.
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 ± 2 °C
(2) Relative Humidity: 60 % ± 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.
3. Test method
(1) Performance: LGE TV test method followed
(2) Demanded other specification
- Safety : CE, IEC specification
- EMC : CE, IEC specification
4. Model General Specification
No. Item Specication Remarks
1 Market Asia, Oceania, Africa, Middle East
2Broadcasting
system
(1) Digital TV : DVB-T/T2, DVB-C, DVB-S/S2
(2) Analogue TV
PAL B/B, PAL B/G, PAL D/K, PAL-I,
SECAM B/G, SECAM D/K, NTSC-M
Depending on country
3 Program coverage
(1) Digital TV
-DVB-T / DVB-T2*
-VHF III : 174 ~ 230 MHz
-UHF IV : 470 ~ 606 MHz
-UHF V : 606 ~ 862 MHz
-S Band II : 230 ~ 300 MHz
-S Band III : 300 ~ 470 MHz
-DVB-S/S2* (950 ~ 2150 MHz)
-DVB-C (46 ~ 890 MHz)
(2) Analogue TV (46 ~ 862 MHz)
Only DVB-T2/C/S2 support model only.
4 Receiving system
Analog : Upper Heterodyne
Digital : COFDM(DVB-T) Only DVB-T Model
Digital : COFDM(DVB-T/T2) Only DVB-T2 Model
Digital : QAM
► 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
- 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
64-QAM : 1/2, 2/5, 2/3, 3/4, 5/6
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 (Model : *VA)
- 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

- 7 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
5. External Input Support Format
5.1. CVBS input
5.2. Component input(Y, CB/PB, CR/PR)
No. Resolution H-freq(kHz) V-freq(Hz) Pixel clock(MHz) Proposed
1 720*480i 15.73 59.94 13.50 SDTV, DVD 480I(525I)
2 720*480i 15.75 60.00 13.51 SDTV, DVD 480I(525I)
3 720*576i 15.62 50.00 13.50 SDTV, DVD 576I(625I) 50Hz
4 720*480p 31.47 59.94 27.00 SDTV 480P
5 720*480p 31.50 60.00 27.03 SDTV 480P
6 720*576p 31.25 50.00 27.00 SDTV 576P 50Hz
7 1280*720 44.96 59.94 74.18 HDTV 720P
8 1280*720 45.00 60.00 74.25 HDTV 720P
9 1280*720 37.50 50.00 74.25 HDTV 720P 50Hz
10 1920*1080 28.12 50.00 74.25 HDTV 1080I 50Hz,
11 1920*1080 33.72 59.94 74.18 HDTV 1080I
12 1920*1080 33.75 60.00 74.25 HDTV 1080I
13 1920*1080 56.25 50.00 148.50 HDTV 1080P
14 1920*1080 67.43 59.94 148.50 HDTV 1080P
15 1920*1080 67.50 60.00 148.50 HDTV 1080P
No. Resolution H-freq(kHz) V-freq(Hz) Pixel clock(MHz) Proposed Remarks
1 720*480i 15.73 59.94 13.50 SDTV, DVD 480I(525I) NTSC-M
2 720*480i 15.73 60.00 13.51 SDTV, DVD 480I(525I) NTSC-M
3 720*576i 15.63 50.00 13.50 SDTV, DVD 576I(625I) 50Hz PAL-BDGHI
No. Item Specication Remarks
5 Head Phone out Antenna, HDMI1, HDMI2, HDMI3, HDMI4 USB1,
USB2, USB3, AV, Comp Depending on country
6 Component Input Y/Pb/Pr Depending on country
7HDMI
Input
HDMI1
PC / DTV Format Support HDMI2.1
HDMI2
HDMI3
HDMI4
8 Video Input RCA PAL, SECAM, NTSC 4 System : PAL, SECAM, NTSC, PAL60
9 Audio Input DVI Audio, Component, AV
10 SPDIF out (1 EA) Optical Audio out
11 USB Input (3 EA) EMF, For SVC (download)
12 Ethernet Connect
(1EA) STP cable
13 PCMCIA Card slot
(1EA) PCMCIA Slot only EU/CIS

- 8 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
5.3. HDMI input(DTV)
No. Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed Remarks
1 640*480 31.46 59.94 25.125 SDTV 480P
2 640*480 31.50 60.00 25.125 SDTV 480P
3 720*480 15.73 59.94 13.500 SDTV, DVD 480I(525I)
Spec. out but display4 720*480 15.75 60.00 13.514 SDTV, DVD 480I(525I)
5 720*576 15.62 50.00 13.500 SDTV, DVD 576I(625I) 50Hz
6 720*480 31.47 59.94 27 SDTV 480P
7 720*480 31.50 60.00 27.027 SDTV 480P
8 720*576 31.25 50.00 27 SDTV 576P
9 1280*720 37.5 50.00 74.25 HDTV 720P
10 1280*720 44.96 59.94 74.176 HDTV 720P
11 1280*720 45.00 60.00 74.25 HDTV 720P
12 1920*1080 33.72 59.94 74.176 HDTV 1080I
13 1920*1080 33.75 60.00 74.25 HDTV 1080I
14 1920*1080 28.12 50.00 74.25 HDTV 1080I
15 1920*1080 26.97 23.97 63.296 HDTV 1080P
16 1920*1080 27.00 24.00 63.36 HDTV 1080P
17 1920*1080 33.71 29.97 79.120 HDTV 1080P
18 1920*1080 33.75 30.00 79.20 HDTV 1080P
19 1920*1080 56.25 50.00 148.5 HDTV 1080P
20 1920*1080 67.43 59.94 148.350 HDTV 1080P
21 1920*1080 67.50 60.00 148.50 HDTV 1080P
22 1920*1080 135.00 120.00 HDTV 1080P
23 1920*1080 134.86 119.88 HDTV 1080P
24 1920*1080 112.50 100.00 HDTV 1080P
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
30 3840*2160 112.5 50.00 594 UDTV 2160P When HDMI1,2,3
UHD DEEP COLOUR ON
31 3840*2160 134.86 59.94 593.407 UDTV 2160P When HDMI1,2,3
UHD DEEP COLOUR ON
32 3840*2160 135.00 60.00 594 UDTV 2160P When HDMI1,2,3
UHD DEEP COLOUR ON
33 4096*2160 53.95 23.98 296.703 UDTV 2160P
34 4096*2160 54.00 24.00 297 UDTV 2160P
35 4096*2160 56.25 25.00 297 UDTV 2160P
36 4096*2160 61.43 29.97 296.703 UDTV 2160P
37 4096*2160 67.50 30.00 297 UDTV 2160P
38 4096*2160 112.50 50.00 594 UDTV 2160P When HDMI1,2,3
UHD DEEP COLOUR ON
39 4096*2160 134.86 59.94 593.407 UDTV 2160P When HDMI1,2,3
UHD DEEP COLOUR ON
40 4096*2160 135.00 60.00 594 UDTV 2160P When HDMI1,2,3
UHD DEEP COLOUR ON

- 9 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
5.4. 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 VESA(SVGA)
5 1024*768 48.36 60.00 65 VESA(XGA)
6 1152*864 54.34 60.05 80 VESA
7 1360*768 47.71 60.01 84.75 VESA(WXGA)
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 1920*1080 135 120
11 3840*2160 54 24.00 297.00 UDTV 2160P
12 3840*2160 56.25 25.00 297.00 UDTV 2160P
13 3840*2160 67.5 30.00 297.00 UDTV 2160P
14 4096*2160 53.95 23.97 296.703 UDTV 2160P
15 4096*2160 54 24 297 UDTV 2160P

- 10 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
SOFTWARE UPDATE
1. USB DOWNLOAD
(1) Insert the USB memory Stick to the USB port.
(2) Automatically detect the SW Version and show the below
message.
(3) Click [YES]: initiate the download and install of the update.
(4) Click [Check Now]: move to “About This TV” page for update.
(5) TV is updating.
(6) After finished the update, below Pop-up appear.
(7) Click [Yes] : TV will be DC OFF -> ON
(8) After TV turned on, Check the updated SW Version and
Tool Option
2. NSU DOWNLOAD
* This Function is needed to connect to the internet.
(1) Menu → All Settings → General → About This TV
(2) Click [CHEK FOR UPDATES]: system check newest version.
(3) Click [DOWNLOAD AND INSTALL].
(4) TV is updating.
(5) After finished the update, below Pop-up appear.
(6) Turn OFF the TV and On. Check the updated SW Version
and Tool Option.

- 11 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
OCP
1.5A
Audio 2 AMP
Main
SoC
USB1 (2.0 )
OPTIC
LAN
DDR4
(512MB X 2EA)
HDMI1 (2.1) HDMI2 (2.1)
HDMI3 (2.1)
SYSTEM EEPROM
USB2 (2.0) USB3 (2.0)
eMMC
Micom
P_TS
X_TAL
I2S Out
H/P
R
E
A
R
S
I
D
E
R
E A
R
(H)
HP
AMP
SPDIF OUT
BLUTOOTH
IR/KEY/EYE
WIFI
SUB
ASSY
IR
KEY
I2C
CVBS/SIF
Tuner
(ARC)
X_TAL
OCP
1.5A
OCP
1.5A
HDMI4 (2.1)
DDR Controller
DDR4
(512MB X 2EA)
DDR4
(512MB X 2EA)
BLOCK DIAGRAM
1. SOC

- 12 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
SCL5
SDA5
AAD_ADC_SIF
Tuner
[+3.3V_TUNER] 11
[FE_DEMOD1_1_TS_CLK] 15
[FE_DEMOD1_TS_SYNC] 16
[FE_DEMOD1_TS_VAL] 17
FE_DEMOD1_TS_DATA[0] 18
FE_DEMOD1_TS_DATA[1] 19
FE_DEMOD1_TS_DATA[2] 20
FE_DEMOD1_TS_DATA[3] 21
FE_DEMOD1_TS_DATA[4] 22
FE_DEMOD1_TS_DATA[5] 23
FE_DEMOD1_TS_DATA[6] 24
FE_DEMOD1_TS_DATA[7] 25
[I2C_SCL_5_TU] 1
[I2C_SDA_5_TU] 2
[TU_SIF_TU] 6
[TU_CVBS_TU] 4
[IF_AGC_TU] 5
[/TU_RESET1_TU] 10
FE_DEMOD1_TS_CLK
FE_DEMOD1_TS_SYNC
FE_DEMOD1_TS_VAL
FE_DEMOD1_TS_DATA [0-7]
TU_CVBS
IF_AGC
/TU_RESET1 GPIO6
CVBS_IN1
IFAGC
+3.3V_TU
1.2KΩ
Main
SoC
TP_DVB_CLK
TP_DVB_SOP
TP_DVB_VAL
TP_DVB_DATA0
TP_DVB_DATA1
TP_DVB_DATA2
TP_DVB_DATA3
TP_DVB_DATA4
TP_DVB_DATA5
TP_DVB_DATA6
TP_DVB_DATA7
[3.3V_TU] 3
[+D_Demod_Core] 13
+1.2V Demod Core
+3.3V_TU
33 Ω
2. Tuner + CI

- 13 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
Main SoC
AR15 [CVBS_IN2]
AV_CVBS_IN
AV1
Phone JACK
Component 1
Phone JACK
AV1_CVBS_IN_SOC
AR12 [SOY1_IN] AT12 [Y1_IN] AR13 [PB1_IN] AU14 [PR1_IN]
COMP2_Pb COMP2_Y COMP2_Pr
COMP2_SOG2_IN_SOC COMP2_Y_IN_SOC COMP2_Pb_IN_SOC COMP2_Pr_IN_SOC
Jack Side SOC Side
SPDIF_OUT
SPDIF OUT
H/P JACK HP_LOUT_JACK
HP_ROUT_JACK
AU9 [IEC958OUT] AR9 [AUDA_OUTL] AT9 [AUDA_OUTR]
SPDIF_OUT_ARC
AL34 [ARC_OUT]
COMP2/AV_L_IN COMP2/AV_R_IN
AR10 [AUAD_L_CH2_IN
AT10 [AUAD_R_CH2_IN]
AUAD_L_CH2_IN
AUAD_R_CH2_IN
HP AMP
ARC OUT
(HDMI2)
Front Speaker
Woofer Speaker
MICOM
AMP_RESET
[SCK] [LRCK] [DACLRCH] [I2C_SCL_0/SDA_0]
I2S
[GPIO17]
Audio
AMP
Audio
AMP
AMP_MUTE
(WOOFER_MUTE)
3. Video & Audio IN/OUT

- 14 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
Main SoC
IC101 Hawk2
IC3600
X-tal
(12MHz)
S-Flash
(4MB)
PHY3
PHY2
PHY1 PHY0
HDMI2.0_1 HDMI2.0_2
HDMI2.0_3 HDMI2.0_4
HDMI2.1_3 HDMI2.1_2
HDMI2.1_1
HDMI2.1_0
eARC
eARC / ARC (HDMI2)
HDMI1 JACK
HDMI2 JACK HDMI3 JACK HDMI4 JACK
3.3V 0.95V
-5V, HPD -TMDS
-GPIO 4EA
(Refer to below)
I2C_2(0x42)
S/W
4Pin
(Debug)
I2C_4
ARC ARC TX
eARC TX
ARC_RX MUX
Micom CEC
I2C_1
4Pin-UART
(Debug)
HDMI UEI Detect (Each Port #17)
SPDIF Jack
SPDIF
GPIO11
GPIO12
Low
High
GPIO
GPIO
SoC
Switch IC Usage
M16p3 O18
AH14 (GPIO29) AM11(GPIO107) Y19(RESET) HWAK2_RESET : S/W RESET
AJ13(GPIO30) AN11(GPIO108) V9(GPIO08) HAWK2_WAKE_ON : When entering PM Mode
AJ16(GPIO28) AJ8(GPIO82) D15(DTX01) HWAK2(READY) : Ready
A31(GPIO93) AF5(GPIO87) U6(DTX00) HWAK2_DDC_CTRL : DDC Command flag (Not used)
MIcom Usage
P146(P23) HWAK2_POWER_ON/OFF: Stand-By Voltage Enable
4. HDMI 2.1

- 15 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
IR + Wi-Fi /BT
Wafer 24P
P4000
[UART0_RXD/GPIO106] RS232 IC
IC7200
WIFI_DP / DM
MICOM
IC3000 WOL/WIFI_POWER_ON
[USB2_2_DP0 / DM0]
SOC_RX/TX
[USB3_0_DP0/DM0]
[USB2_1_DP0 / DM0] USB2.0_2_DP1 / DM1
USB2.0_3_DP0 / DM0
[USB2_0_DP0 / DM0]
JK7200 RS232C phone Jack
SOC_RX/TX UART wafer
P3401, P3402
SOC_RX/TX
USB 2
(2.0)_H
USB 3
(2.0)_H
WIFI_EN
OCP
[EB_CS0] USB_CTL1
+5V_USB_1
OCP
[GPIO95] USB_CTL2
+5V_USB_2
OCP
[SPI_DO1] USB_CTL3
+5V_USB_3
[UART0_TXD/GPIO105]
Main SoC
USB 2
(2.0)_V
USB2.0_1_DM0/DP1
COMBO_RESET BT_WAKEUP_DEVICE BT_WAKEUP_HOST
+3.5V_WIFI
For Korea Region Component/AV, RS -232C
Spec. out
5. USB / Wi-Fi / M-Remote / UART

- 16 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
33 Ω +3.3V_NORMAL
3.3KΩ
IC102 NVRAM
3.3KΩ
+3.3V_NORMAL
33Ω
+3.3V_NORMAL
3.3KΩ
IC5400 AMP 100Ω
TUNER (Demod) (JP/EU)
2.7KΩ
+3.3V_TU
33Ω
Main SoC
IC3000 MICOM
33Ω IC6900
LNB
IR / KEY/EYE
100Ω
3.3KΩ
EYE_SDA
EYE_SCL
+3.5V_ST
33pF
18pF
Cap Ready
0x56
0x52
0xCA
0x10
0xA0
Device address
I2C_SCL4: AL21[SCL4]
I2C_SDA4: AM21[SDA4]
I2C_SCL1: AM19[SCL1]
I2C_SDA1: AN19[SDA1]
I2C_SCL3: AL23[SCL3]
I2C_SDA3: AL22[SDA3]
I2C_SCL0: AL20[SCL0]
I2C_SDA0: AL19[SDA0]
I2C_SCL2: AM20[SCL2]
I2C_SDA2: AN20[SDA2]
I2C_SCL5: AN22[SCL5]
I2C_SDA5: AM22[SDA5] Tuner
1.2KΩ
+3.3V_TU
33Ω
47pF
+3.3V_NORMAL
3.3KΩ
OLED module P7601 (Vx1 -51Pin Wafer, 33/34pin
38/39pin)
100Ω
IC5300 AMP
0x54
100Ω
33pF
0xC0
33 Ω
IC2000 DC/DC
0x3E
100Ω
33Ω IC3600
HAWK2
IC5500 AMP
100 Ω
6. I2C Map

- 17 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
200
400
540 521
800
200T
810
530
HR1
HP1
820
820
121
HS1
AR2 A10
700
910
710
900
920
120
500
501
570
571
HW1
LV1LV2
Stand Screw
EXPLODED VIEW
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.
IMPORTANT SAFETY NOTICE

- 18 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
DISASSEMBLY GUIDE / ASSEMBLY GUIDE
Total Screw No. : 33 EA
1. Disassemble stand cover from back cover.
* Push the latch, separate the stand cover to the top.
Latch : 2 EA
1
1 1

- 19 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
2. Remove screw 4 EA, disassemble stand from back cover.
3. Remove screw 1 EA, disassemble power cord from back cover.
`
1
Screw : 1 EA
1
Screw : 4 EA
1
1
1 1
1

- 20 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
4. Remove screw 4 EA, disassemble back cover from module.
* Put hand on the marked area( O), separate the back cover to the top.
5. Remove screw 1 EA, disassemble Wifi/Jog assy.
11
11
2
2 2 2 2 2 2
22
Screw : 4 EA, Latch : 12 EA
1 2
2
22
1
Screw : 1 EA
1