CONFIDENTIAL
OLED TV
SERVICE MANUAL
CHASSIS : ED79A
MODEL : 55EG9A7V 55EG9A7V-ZB
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL70179701 (1703-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 .............................................................................. 13
BLOCK DIAGRAM.................................................................................... 14
EXPLODED VIEW ................................................................................... 20
DISASSEMBLY GUIDE........................................................................... 21
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 CAUTION: Be sure no power is applied to the chassis or cir-
high voltage meter or other voltage measuring device (DVM, cuit, and observe all other safety precautions.
FETVOM, 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 OLED TV with ED79A (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 appointment.
(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 Standard input voltage
(100~240V@ 50/60Hz)
* 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 countries
Germany, Netherland, Switzerland, Hungary, Austria, Slovenia, Bul-
garia, France, Spain, , Belgium, Luxemburg, Greece, Czech, Turkey,
Moroco, Ireland, Latvia, Estonia, Lithuania, Poland, Portugal, Romania,
Albania, Bosnia, Slovakia, Beralus
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, Croatia, Turkey, Moroco, Ireland, Latvia, Estonia, Lithuania,
Poland, Portugal, Romania, Albania, Bosnia, Serbia, Slovakia, Beralus,
UK, Sweden, Denmark, Finland, Norway, Ukraine, Kazakhstan
DTV (MPEG2/4,DVB-S) : 37 countries
1 Market EU/CIS(PAL Market-37Countries)
Germany, Netherland, Switzerland, Hungary, Austria, Slovenia, Bul-
garia, France, Spain,Belgium, Luxemburg, Greece, Czech, Turkey,
Moroco, Ireland, Latvia, Estonia, Lithuania, Poland, Portugal, Romania,
Albania, Bosnia, Slovakia, Beralus, UK(Ireland), Sweden, Denmark,
Finland, Norway, 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 , EURO-
BIRD 9A 9.0E , EUROBIRD3 33.0E , EUTELSAT 36 A/B 36.0E ,
EUTELSAT W2A 10.0E , EUTELSAT W3A 7.0E , EUTELSAT7WA 7.3W
EUTELSAT 16.0E , EXPRESS AM1 40.0E , EXPRESS AM3 140.0E ,
EXPRESS AM33 96.5E , HELLASSAT 39.0E , HISPASAT 1CDE 30.0W
HOTBIRD 13.0E , INTELSAT10&7 68.5E , INTELSAT15 85.2E , IN-
TELSAT1R 50.0W, INTELSAT903 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)PAL/SECAM B/G/I/D/K ,
Broadcasting
2 SECAM L/L’
system
2)DVB-T/T2, C, S/S2
1 ) Digital TV
- VHF, UHF
- C-Band, Ku-Band
2) Analogue TV
3 Program coverage
-VHF : E2 to E12
-UHF : E21 to E69
-CATV : S1 to S20
-HYPER : S21 to S47
▶ 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
Analog : Upper Heterodyne 64-QAM : 1/2, 2/5, 2/3, 3/4, 5/6
4 Receiving system
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
2. symbolrate
DVB-S2 (8PSK / QPSK) : 2 ~ 45Msymbol/s
DVB-S (QPSK) : 2 ~ 45Msymbol/s
2. iterbi
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
5 Input Voltage AC 100 ~ 240V 50/60Hz
-7- Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
5. External Input Format
5.1. 2D Mode
5.1.1. Component input(Y, CB/PB, CR/PR)
No Resolution H-freq (kHz) V-freq (Hz) Pixel clock Proposed
1 720*480 15.73 60 13.5135 SDTV ,DVD 480I
2 720*480 15.73 59.94 13.5 SDTV ,DVD 480I
3 720*480 31.50 60 27.027 SDTV 480P
4 720*480 31.47 59.94 27.0 SDTV 480P
5 1280*720 45.00 60.00 74.25 HDTV 720P
6 1280*720 44.96 59.94 74.176 HDTV 720P
7 1920*1080 33.75 60.00 74.25 HDTV 1080I
8 1920*1080 33.72 59.94 74.176 HDTV 1080I
9 1920*1080 67.500 60 148.50 HDTV 1080P
10 1920*1080 67.432 59.94 148.352 HDTV 1080P
11 1920*1080 27.000 24.000 74.25 HDTV 1080P
12 1920*1080 26.97 23.976 74.176 HDTV 1080P
13 1920*1080 33.75 30.000 74.25 HDTV 1080P
14 1920*1080 33.71 29.97 74.176 HDTV 1080P
5.1.2. HDMI Input (DTV)
No Resolution H-freq (kHz) V-freq (Hz) Pixel clock(MHz) Proposed Remarks
1 640*480 31.46 59.94 25.13 SDTV 480P
2 640*480 31.50 60.00 25.13 SDTV 480P
3 720*480 15.73 59.94 13.50 SDTV, DVD 480I(525I)
4 720*480 15.75 60.00 13.51 SDTV, DVD 480I(525I)
Spec. out but display
SDTV, DVD 576I(625I)
5 720*576 15.62 50.00 13.50
50Hz
6 720*480 31.47 59.94 27.00 SDTV 480P
7 720*480 31.50 60.00 27.03 SDTV 480P
8 720*576 31.25 50.00 27.00 SDTV 576P
9 1280*720 44.96 59.94 74.18 HDTV 720P
10 1280*720 45.00 60.00 74.25 HDTV 720P
11 1280*720 37.50 50.00 74.25 HDTV 720P
12 1920*1080 28.12 50.00 74.25 HDTV 1080I
13 1920*1080 33.72 59.94 74.18 HDTV 1080I
14 1920*1080 33.75 60.00 74.25 HDTV 1080I
15 1920*1080 26.97 23.97 63.30 HDTV 1080P
16 1920*1080 27.00 24.00 63.36 HDTV 1080P
17 1920*1080 33.71 29.97 79.12 HDTV 1080P
18 1920*1080 33.75 30.00 79.20 HDTV 1080P
19 1920*1080 56.25 50.00 148.50 HDTV 1080P
20 1920*1080 67.43 59.94 148.35 HDTV 1080P
21 1920*1080 67.50 60.00 148.50 HDTV 1080P
-8- Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
5.1.3. HDMI Input (PC)
No Resolution H-freq (kHz) V-freq (Hz) 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 1152*864 54.34 60.05 80.00 VESA
7 1280*1024 63.98 60.02 109.00 VESA(SXGA) FHD only
8 1360*768 47.71 60.01 85.00 VESA(WXGA)
9 1920*1080 67.50 60.00 158.40 WUXGA(CEA 861D) FHD only
5.2. 3D Mode
5.2.1. RF Input
No Resolution H-freq (kHz) V-freq (Hz) Pixel clock Proposed 3D input proposed mode
1 1280*720 37.50 50 74.25 HDTV 720P 2D to 3D, Side by Side, Top & Bottom
2 1920*1080 28.13 50 74.25 HDTV 1080I 2D to 3D, Side by Side, Top & Bottom
5.2.2. HDMI Input (3D supported mode automatically)
3D input proposed
No Resolution H-freq (kHz) V-freq (Hz) Pixel clock VIC Proposed
mode
Top-and-Bottom Secondary(SDTV 480P)
31.46 / 31.50 59.94/ 60.00 25.13/25.20 1
Side-by-side(half) Secondary(SDTV 480P)
1 640*480 31.46 / 31.50 59.94/ 60.00 50.35/50.40 1 Side-by-side(Full) (SDTV 480P)
Frame packing Secondary(SDTV 480P)
62.93 / 63.00 59.94/ 60.00 50.35/50.40 1
Line alternative (SDTV 480P)
Top-and-Bottom Secondary(SDTV 480P)
31.46 / 31.50 59.94/ 60.00 27.00/27.03 2,3
Side-by-side(half) Secondary(SDTV 480P)
2 720*480 31.46 / 31.50 59.94/ 60.00 27.00/27.03 2,3 Side-by-side(Full) (SDTV 480P)
Frame packing Secondary(SDTV 480P)
62.93 /63.00 59.94/ 60.00 54.00/54.06 2,3
Line alternative (SDTV 480P)
Top-and-Bottom (SDTV 576I)
Side-by-side(half) Secondary(SDTV 576I)
3 720*576 15.62 50.00 27.00 21 Side-by-side(Full) (SDTV 576I)
Frame packing Secondary(SDTV 576I)
Field alternative Secondary(SDTV 576I)
Top-and-Bottom Secondary(SDTV 576P)
31.25 50.00 27.00 17,18 Side-by-side(half) Secondary(SDTV 576P)
4 720*576 Side-by-side(Full) (SDTV 576P)
Frame packing Secondary(SDTV 576P)
62.50 50.00 54.00 17,18
Line alternative (SDTV 576P)
-9- Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
3D input proposed
No Resolution H-freq (kHz) V-freq (Hz) Pixel clock VIC Proposed
mode
Top-and-Bottom Primary(HDTV 720P)
37.50 50.00 74.25 19
Side-by-side(half) Primary(HDTV 720P)
37.50 50.00 148.50 19 Side-by-side(Full) (HDTV 720P)
Top-and-Bottom Primary(HDTV 720P)
44.96 / 45.00 59.94/ 60.00 74.17/74.25 4
Side-by-side(half) Primary(HDTV 720P)
5 1280*720
44.96 / 45.00 59.94/ 60.00 148.35/148.50 4 Side-by-side(Full) (HDTV 720P)
Frame packing Primary(HDTV 720P)
75.00 50.00 148.50 19
Line alternative (HDTV 720P)
Frame packing Primary(HDTV 720P)
89.91/90.00 59.94/ 60.00 148.35/148.50 4
Line alternative (HDTV 720P)
Top-and-Bottom Secondary(HDTV 1080I)
28.12 50.00 74.25 20
Side-by-side(half) Primary(HDTV 1080I)
28.12 50.00 148.50 20 Side-by-side(Full) (HDTV 1080I)
Top-and-Bottom Secondary(HDTV 1080I)
33.72 / 33.75 59.94/ 60.00 74.17/74.25 5
Side-by-side(half) Primary(HDTV 1080I)
6 1920*1080
33.72 / 33.75 59.94/ 60.00 148.35/148.50 5 Side-by-side(Full) (HDTV 1080I)
Frame packing Primary(HDTV 1080I)
56.25 50.00 148.50 20
Field alternative (HDTV 1080I)
Frame packing Primary(HDTV 1080I)
67.43/67.50 59.94/ 60.00 148.35/148.50 5
Field alternative (HDTV 1080I)
Top-and-Bottom Primary(HDTV 1080P)
26.97 / 27.00 23.97/ 24.00 74.17 / 74.25 32
Side-by-side(half) Primary(HDTV 1080P)
26.97 / 27.00 23.97/ 24.00 148.35/148.50 32 Side-by-side(Full) (HDTV 1080P)
Top-and-Bottom Secondary(HDTV 1080P)
28.12 25.00 74.25 33
Side-by-side(half) Secondary(HDTV 1080P)
28.12 25.00 148.50 33 Side-by-side(Full) (HDTV 1080P)
Top-and-Bottom Primary(HDTV 1080P)
33.71 / 33.75 29.97/ 30.00 74.18/74.25 34
Side-by-side(half) Secondary(HDTV 1080P)
33.71 / 33.75 29.97/ 30.00 148.35/148.50 34 Side-by-side(Full) (HDTV 1080P)
7 1920*1080 Frame packing Primary(HDTV 1080P)
43.94/54.00 23.97/ 24.00 148.35/148.50 32
Line alternative (HDTV 1080P)
Frame packing Secondary(HDTV 1080P)
56.25 25.00 148.50 33
Line alternative (HDTV 1080P)
Frame packing Primary(HDTV 1080P)
67.43 / 67.5 29.97/ 30.00 148.35/148.50 34
Line alternative (HDTV 1080P)
Top-and-Bottom Primary(HDTV 1080P)
56.25 50.00 148.50 31
Side-by-side(half) Secondary(HDTV 1080P)
Top-and-Bottom Primary(HDTV 1080P)
67.43 / 67.50 59.94/ 60.00 148.35/148.50 16
Side-by-side(half) Secondary(HDTV 1080P)
- 10 - Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
5.2.3. Component Input ( 3D) (3D supported mode automatically)
No Resolution H-freq (kHz) V-freq (Hz) Pixel clock Proposed 3D input proposed mode
2D to 3D,
1 1280*720 37.50 50.00 74.25 HDTV 720P
Side by Side(half), Top & Bottom
2D to 3D,
2 1280*720 45.00 60.00 74.25 HDTV 720P
Side by Side(half), Top & Bottom
2D to 3D,
3 1280*720 44.96 59.94 74.18 HDTV 720P
Side by Side(half), Top & Bottom
2D to 3D,
4 1920*1080 33.75 60.00 74.25 HDTV 1080I
Side by Side(half), Top & Bottom
2D to 3D,
5 1920*1080 33.72 59.94 74.18 HDTV 1080I
Side by Side(half), Top & Bottom
2D to 3D,
6 1920*1080 28.12 50.00 74.25 HDTV 1080I
Side by Side(half), Top & Bottom
2D to 3D,
7 1920*1080 67.50 60.00 148.50 HDTV 1080P
Side by Side(half), Top & Bottom
2D to 3D,
8 1920*1080 67.43 59.94 148.35 HDTV 1080P
Side by Side(half), Top & Bottom
2D to 3D,
9 1920*1080 27.00 24.00 74.25 HDTV 1080P
Side by Side(half), Top & Bottom
2D to 3D,
10 1920*1080 28.12 25.00 74.25 HDTV 1080P
Side by Side(half), Top & Bottom
2D to 3D,
11 1920*1080 56.25 50.00 74.25 HDTV 1080P
Side by Side(half), Top & Bottom
2D to 3D,
12 1920*1080 26.97 23.97 74.18 HDTV 1080P
Side by Side(half), Top & Bottom
2D to 3D,
13 1920*1080 33.75 30.00 74.25 HDTV 1080P
Side by Side(half), Top & Bottom
2D to 3D,
14 1920*1080 33.71 29.97 74.18 HDTV 1080P
Side by Side(half), Top & Bottom
5.2.4. HDMI-PC Input (3D) (3D supported mode manually)
No Resolution H-freq (kHz) V-freq (Hz) Pixel clock Proposed 3D input proposed mode
1 1024*768 48.36 60.00 65.00 HDTV 768P 2D to 3D,
Side by Side(half),
2 1360*768 47.71 60.00 HDTV 768P Top & Bottom
2D to 3D,
Side by Side(half),
Top & Bottom,
3 1920*1080 67.50 60.00 148.50 HDTV 1080P Checker Board,
Frame Sequential,
Row Interleaving,
Column Interleaving
640*350
720*400 2D to 3D,
4 Others - - - 640*480 Side by Side(half),
800*600 Top & Bottom
1152*864
- 11 - Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
5.2.5. HDMI-DTV (3D supported mode manually)
No Resolution H-freq (kHz) V-freq (Hz) Pixel clock Proposed 3D input proposed mode
1 720*480 31.50 60.00 27.03 SDTV 480P
2D to 3D, Side by Side(Half),
2 720*576 31.25 50.00 27.00 SDTV 576P Top & Bottom, Checker Board, Frame
45.00 60.00 74.25 HDTV 720P Sequential, Row Interleaving, Column
3 1280*720 Interleaving
37.50 50.00 74.25 HDTV 720P
33.75 60.00 74.25 HDTV 1080I 2D to 3D, Side by Side(Half),
4 1920*1080
28.12 50.00 74.25 HDTV 1080I Top & Bottom
27.00 24.00 74.25 HDTV 1080P 2D to 3D, Side by Side(Half),
28.12 25.00 74.25 HDTV 1080P Top & Bottom, Checker Board, Row
33.75 30.00 74.25 HDTV 1080P Interleaving, Column Interleaving
67.50 60.00 148.50 HDTV 1080P 2D to 3D, Side by Side(Half),
5 1920*1080
56.25 50.00 148.50 HDTV 1080P Top & Bottom,
Checker Board,
60.00 Single FrameSequential,
135.00 (HDMI1,HDMI2 594.00 Row Interleaving,
Only) Column Interleaving
- 12 - 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.
- 13 - Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
X_TAL DDR3 2133 X 16 1. SOC
24MHz (256MB X 2EA)
Tuner
Tuner : I2C 6 IF (+/-) Demod :
R DDR3 2133 X 16
E ATSC, (128MB X 2EA)
D-Demod : I2C 4 P_TS DVB-T/C,
A
R ISDB-T
CVBS/SIF Analog Demod
(H) SYSTEM EEPROM
(256Kb)
OCP eMMC
S USB1 (2.0) 1.5A
Main SOC (4GB)
I
HDMI1 (1.4)
D
E HDMI2 (1.4)
OCP
USB2 (2.0) 1.5A
I2S Out
- 14 -
Audio 1 AMP
OCP
USB3 (2.0) 1.5A
HDMI3 (1.4)
R (ARC)
BLOCK DIAGRAM
E BLUTOOTH
Copyright ©
A
R WIFI
AV
SUB
COMP ASSY
IR / KEY/EYE
IR
OPTIC SPDIF OUT I2C
LAN KEY
Only for training and service purposes.
X_TAL
25MHz Sub Micom
X_TAL
LG Electronics. Inc. All rights reserved.
32.768kHz
TUNER +3.3V_TUNER
CI Slot
2. Tuner + CI
[+3.3V_LNA_TU] 1 +1.2V_Demod_Core
PCM_5V_CTL CI 5V +5V_CI_ON
(No use)
[+3.3V_TUNER] 11 VCC
Power detect
+3.3V_TUNER
MAIN
+5V_CI_ON +3.3V_NORMAL
[D_Demod_Core] 28 SOC
3.3Kȳ R28 [CAM_VCCEN_N]
[I2C_SCL6_TU] 4 I2C_SCL6 10K ȳ 47K ȳ
33 ȳ AG23[SCL5] P28 [CAM_CD1_N] /CI_CD1,2 /CI_CD1
[I2C_SDA6_TU] 5 I2C_SDA6 AH24[SDA5] B23[CAM_CD2_N] /CI_CD2
FE_DEMOD1_TS_ERROR B29[TPI_VAL]
CI_TS_VAL CI_TS_VAL
[FE_DEMOD1_TS_ERROR] 12 AH33[TP_DVB_ERR]
U28[CAM_CE1_N] /PCM_CE1 /PCM_CE2 /PCM_CE1
[FE_DEMOD1_TS_CLK] 14 AH30 [TP_DVB_CLK]
FE_DEMOD1_TS_CLK R29[CAM_CE2_N] /PCM_CE2
[FE_DEMOD1_TS_SYNC] 15 AH32 [TP_DVB_SOP]
[FE_DEMOD1_TS_VAL] 16 FE_DEMOD1_TS_SYNC AH31 [TP_DVB_VAL]
FE_DEMOD1_TS_VAL /PCM_IOWR
G29 [EB_BE_N1] /PCM_IOWR
G28 [EB_EB_N0]
/PCM_IORD
/PCM_IORD
CI_ADDR[0-14]
FE_DEMOD1_TS_DATA[0] 17 [EB_ADDR_0~14] CI_ADDR[0-14]
AJ31 [TP_DVB_DATA0]
- 15 -
FE_DEMOD1_TS_DATA[1] 18
AJ30 [TP_DVB_DATA1] CI_DATA[0-7]
FE_DEMOD1_TS_DATA[2] 19
FE_DEMOD1_TS_DATA [0-7] AK31 [TP_DVB_DATA2] [EB_DATA_0~7] CI_DATA[0-7]
FE_DEMOD1_TS_DATA[3] 20
AK33 [TP_DVB_DATA3]
FE_DEMOD1_TS_DATA[4] 21
AK32 [TP_DVB_DATA4] PCM_RESET
FE_DEMOD1_TS_DATA[5] 22 T28[CAM_RESET] PCM_RESET
AL33 [TP_DVB_DATA5]
FE_DEMOD1_TS_DATA[6] 23 /PCM_WAIT
AL32 [TP_DVB_DATA6] U27[CAM_WAIT_N] /PCM_WAIT
FE_DEMOD1_TS_DATA[7] 24
AM33 [TP_DVB_DATA7] T29[CAM_INPACK_N] PCM_INPACK
PCM_INPACK
Copyright ©
N29[CAM_REG_N]
/PCM_REG /PCM_REG
/PCM_IRQA /PCM_IRQA
/TU_RESET1 V27[CAM_IREQ_N]
[/TU_RESET1_TU] 25 AH19 [GPIO26] /PCM_OE
F30 [EB_OE_N] /PCM_OE
/PCM_WE
G30 [EB_WE_N] /PCM_WE
IF_P ADC_I_INP
[IF_P_TU] 6 AK28 [DMD_ADC_INP] CI_IN_TS_CLK
FILTER D28 [TPIO_CLK] CI_IN_TS_CLK
IF_N ADC_I_INN CI_IN_TS_VAL
[IF_N_TU] 7 AL28 [DMD_ADC_INN]
E28 [TPIO_VAL] CI_IN_TS_VAL
CI_IN_TS_SYNC
E29 [TPIO_SOP] CI_IN_TS_SYNC
TPI_DATA [0-7] CI_TS_DATA[0-7]
Only for training and service purposes.
IF_AGC [TPI_DATA 0~7] 100 ȳ CI_TS_DATA[0~7]
[IF_AGC_TU] 3 AM29[IFAGC]
TPO_DATA[0-7] CI_IN_TS_DATA[0-7]
[TPIO_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
AV1_CVBS AV1_CVBS_IN_SOC
AM27 [CVBS_I32]
AN17 [AUAD_L_CH3_IN]
COMP1/AV1/DVI_R_IN AUAD_R_CH3_IN AM17 [AUAD_R_CH3_IN]
COMP1/AV1/DVI_L_IN AUAD_L_CH3_IN
Component 1
Phone JACK COMP2_Y_IN_SOC_SOY
COMP2_Y_IN_SOC AL24 [SOY2_IN]
COMP2_PB_IN_SOC AK23 [Y2_IN]
COMP1_Pb
3. Video & Audio IN/OUT
COMP2_PR_IN_SOC AL23 [PB2_IN]
COMP1_Pr
COMP2_Y AK24 [PR2_IN]
Speaker
Audio [DAC_LRCH]
AMP [DAC_SCK] I2S
NTP7515 [DAC_LRCK]
- 16 -
[I2C_SCL_1/I2C_SDA_1]
AMP_RESET_N
AH5 [GPIO23]
Copyright ©
MICOM
AMP_MUTE
SPDIF OUT
Only for training and service purposes.
SPDIF_OUT
AM15 [IEC958OUT]
ARC OUT
(HDMI3) SPDIF_OUT_ARC
AE28 [HDMI_1_ARC]
LG Electronics. Inc. All rights reserved.
MICOM
4. HDMI 1.4
MAIN SOC
CEC_REMOTE
+5V
Port_1
HDMI 1 [HDMI_4_SCL]
DDC_SCL_4/DDC_SDA_4
(1.4)_V [HDMI_4_SDA] HDCP1.4
HDMI_HPD_4 HDCP2.2
[HDMI_HPD_4]
CEC_REMOTE
+5V
Port_2 [HDMI_2_SCL]
HDMI 2 DDC_SCL_2/ DDC_SDA_2
(1.4)_V [HDMI_2_SDA] HDCP1.4
HDCP2.2
HDMI_HPD_2
[HDMI_2_HPD]
- 17 -
CEC_REMOTE
HDMI 3 +5V Port_3
[HDMI_1_SCL]
(1.4)_H DDC_SCL_1/DDC_SDA_1 HDCP1.4
[HDMI_1_SDA]
ARC HDCP2.2
HDMI_HPD_1
[HDMI_1_HPD]
Copyright ©
SPDIF_OUT_ARC
[HDMI_1_ARC]
Only for training and service purposes.
LG Electronics. Inc. All rights reserved.
MAIN SOC
USB_DP3/DM3 +5V_USB_1 USB 1
[USB2_1_DP0/DM0] (2.0)_V
USB_CTL3
[EB_CS0] OCP
USB_DP2/DM2 +5V_USB_2 USB 2
[USB3_DP1/DM1]
USB_CTL2 (2.0)_V
[EB_CS2] OCP
USB_DP1/DM1 +5V_USB_3
[USB3_DP0 / DM0] USB 3
USB_CTL1 (2.0)_H
[HUB_VBUS_CTRL0]
5. USB / Wi-Fi / M-Remote / UART
OCP
WIFI_DP / DM IR + Wi-Fi /BT
- 18 -
[USB2_0_DP0/DM0] Wafer 8P
+3.5V_WIFI
WIFI_EN
MICOM
WOL/WIFI_POWER_ON
Copyright ©
SOC_RX/TX
SOC_RX/TX UART wafer
[UART0_RXD]
SOC_RX/TX
[UART0_TXD] RS232 IC
Only for training and service purposes.
JK6800
RS232C phone Jack
LG Electronics. Inc. All rights reserved.
Cap Ready
MAIN SOC
6. I2C Map
+3.3V_NORMAL
+3.3V_TU
YU^r˟
I2C_SCL1: AH11[SCL0] ZZ˟ LNB (No use)
AUDIO AMP XWWG˟
I2C_SDA1: AG11[SDA0] XUYr˟
33pF
I2C_SCL4: AH22 [SCL3] ZZ˟ TUNER (Demod)
+3.3V_NORMAL I2C_SDA4: AJ22 [SDA3]
18pF
ZUZr˟
+3.3V_NORMAL
I2C_SCL_MICOM_SOC: AH9 [SCL1]
MICOM
- 19 -
I2C_SDA_MICOM_SOC: AG9 [SDA1]
ZUZr˟
EYE_SDA ZUZr˟ +3.5V_ST
EYE_SCL XWW˟
+3.3V_NORMAL I2C_SCL5: AH10 [SCL4]
ZZ˟ NVRAM
Copyright ©
IR / KEY/EYE I2C_SDA5: AJ10 [SDA4]
+3.3V_TU
ZUZr˟
I2C_SCL2: AG10 [SCL2]
I2C_SDA2: AJ9 [SDA2] ZUZr˟
T-CON,L/DIMING
Only for training and service purposes.
I2C_SCL6: AG23 [SCL5]
ZZ˟
I2C_SDA6: AH24 [SDA5] Tuner
47pF
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.
900
920
400
571
570
521
710
540
LV1
120
810
500
121
200
530
700
A10
AR2
- 20 - Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
DISASSEMBLY GUIDE
1. Put the set on the flat pad.
2. Remove Rear Small Cover
Pull up bottom of Rear Small Cover to remove.
- 21 - Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
3. Remove Stand Screw and Stand
FAB30016103 (M4*12mm), 4EA
Remove Screw 4EA first, next remove Stand
4. Remove Back Cover Screw 5. Remove PowerCord Bracket
FAB31843216 (M3*5.5mm, Gray) 9EA Pull up Power Cord, than remove
jGG\\ˉV]\ˉ G Bracket, next remove cord from PSU.
FAB31843216 (M3*5.5mm, Gray) 1EA
hG G\\ˉ
- 22 - Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
6. Remove Back Cover
Pull up bottom of Back Cover to remove.
- 23 - 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 MR15RA operating checking 11
D. Function error
12 Wifi operating checking 12
13 External device recognition error 13
14 E. Noise Circuit noise, mechanical noise 14
15 F. Exterior error Exterior defect 15
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 1/15
First of all, Check whether all of cables between board is inserted properly or not.
(Main B/D↔ Power B/D, Vx1 Cable, Speaker Cable, IR B/D Cable,,,)
☞A1 ☞A9
No video Normal Y Check Vx1 lock Y Check Power Normal Y
Normal audio 0V Replace Main Board
audio voltage Board (Main) voltage
20V, 12V etc.
N N
N
Move to No Check Power Board (Module) 24V output Repair Power
☞A9
video/No audio Board or parts
Normal Y
Replace 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 2/15
☞A9
Check various voltages Check and
No Video/ of Power Board (Main) Normal Y
replace
No audio (20V, 12V…) 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 3/15
. By using Digital signal level meter
☞ A3
. By using Diagnostics menu on OSD
Check RF Signal level ( All Settings→ Channels → Channel Tuning → Manual Tuning → Check the Signal )
- Signal strength (Normal : over 50%)
- Signal Quality (Normal: over 50%)
Y Check whether other equipments have problem or not.
Normal
(By connecting RF Cable at other equipment)
Signal?
→ DVD Player ,Set-Top-Box, Different maker TV etc`
N
☞ A4
Check RF Cable
Normal Y Check SVC N Check Y
Connection Close
1. Reconnection Picture? S/W Version Bulletin? Tuner soldering
2. Install Booster N
N Y
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 4/15
☞A6 ☞ A7
※ Check
Check color by input
and replace
-External Input
Color Y Link Cable Color Y Color Y
-AV Replace Main B/D Replace module
error? (V by one) error? error?
-HDMI
and contact
N condition N N
Check error End
color input
mode
☞A15 Check
External device Y
External Input external
Check Test pattern /Cable Replace Main B/D
error device and
normal
cable
N
Request repair
for external
device/cable
N
Check external External device Y
HDMI
device and /Cable Replace Main B/D
error
cable normal
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 5/15
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
-HDMI Normal? replace Link Replace Main B’D
normal? connection normal? normal?
Cable
condition
N N Y for LGD Panel Y
Replace Main B’D
Replace Request repair End End
module for external
☞A15 device
Check Test pattern
External device screen error-Color error
Check screen Connect other external
condition by input External device and cable Screen N Replace
N -External Input Input (Check normal operation of normal? Main B/D /
Check S/W Version Check
-AV error External Input, HDMI/DVI Module
version
-HDMI/DVI by connecting Jig, pattern Y
Generator ,Set-top Box etc.
Y
Request repair for
external device
S/W Upgrade
Y
Connect other external
device and cable
(Check normal operation of Screen N Replace
HDMI/ Main B/D /
External Input, Component, normal?
DVI Module
Normal N RGB and HDMI/DVI by
screen? connecting Jig, pattern
Generator ,Set-top Box etc.
Y
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 6/15
☞A8 ☞A9
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
☞A9
Measure voltage of each output of Power B/D
N
Normal?
Y
Y Y
Normal Replace Main B/D
voltage?
Close Normal
Check ST-BY (7.8V)
Y
voltage? N
☞A9 N Replace Power B/D
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 7/15
Check outlet
☞A10
N Y
Check A/C cord Error? Check Power Off CPU
Replace Main B/D Normal? End
Mode Abnormal
Y N
Check for all 2- phase
power out Abnormal Replace Power B/D
1
Fix A/C cord & Outlet ☞A9
and check each 2
(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
"POWER_OFF_BY_REMOTE_KEY” Power off by REMOTE CONTROL
can be displayed on power off mode.
"POWER_OFF_BY_OFF_TIMER" Power off by OFF TIMER
"POWER_OFF_BY_SLEEP_TIMER" Power off by SLEEP TIMER
"POWER_OFF_BY_INSTOP" Power off by INSTOP KEY
"POWER_OFF_BY_AUTO_OFF" Power off by AUTO OFF
Normal "POWER_OFF_BY_ON_TIMER" Power off by ON TIMER
"POWER_OFF_BY_RS232C" Power off by RS232C
"POWER_OFF_BY_RESREC" Power off by Reservated Record
"POWER_OFF_BY_RECEND" Power off by End of Recording
"POWER_OFF_BY_SW_DW" Power off by S/W Download
"POWER_OFF_BY_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 8/15
☞A11 ☞A12+A9
Check user Check audio B+
No audio N Normal Y
menu > Off 20V 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
connecting 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 9/15
→ abnormal audio/discontinuation/noise is same after “Check input signal” compared to No audio
Wrecked audio/
☞A12+A9
Check and replace
Discontinuation/ Check audio
speaker and
Noise for B+ Voltage (20V)
connector
Check input all audio
signal
Signal Y
-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 Wrecked audio/ Replace Main B/D End
cable/ANT provider Discontinuation/
Noise only
for External Input
(In case of
External Input Connect and check Normal N
signal error) other external audio?
Check and fix device
external 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 10/15
1. Remote control(R/C) operating error Replace
Main B/D
☞A13 ☞A13 ☞A13
Check & Repair Check B+ Y Y
Check R/C itself Normal Y Normal N Normal Check IR Normal
operating? Cable connection operating? 3.5V Voltage? Signal?
Operation Output signal
Connector solder On Main B/D
N Y N N
☞A9
Check R/C Operating Check & Replace Check 7.8V on Power B/D Repair/Replace
Close
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
MR15RA operating checking Revised date 11/15
2. MR15RA (Magic Remocon) operating error
☞A4
Check the RF Receiver ver N Check MR15RA Normal Y Press the Is show ok N Turn off/on the
INSTART menu is “00.00”? itself Operation operating? wheel message? set and press
the wheel
N Y
Y
☞A14
Check & Replace
Check & Repair Battery of MR15RA Close
RF assy
connection
Normal Y
☞A4 operating? Close
Is show ok N Press the back
RF Receiver ver N N message? key about 5sec
is “00.00”? Close
Y
Replace
Y MR15RA
Close
Down load the Firmware
* INSTART MENU12.RF •If you conduct the loop at 3times,
Remocon Test Receiver change the MR15RA.
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 12/15
3.Wifi operating error
☞A4 ☞A14
Check the Wi-Fi Mac value N Check the Wifi wafer Normal N Replace
INSTART menu is “NG”? 1pin Voltage? Main B/D
Y
Y
☞A14
Check & Repair Close
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
Established
Error D. Function error date
symptom
External device recognition error Revised date 13/15
Check technical
Check Y
Signal information Technical N External Input
input 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
13
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Standard Repair Process
Established
Error E. Noise date
symptom
Circuit noise, mechanical noise Revised date 14/15
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)
14
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 Vx1 lock 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) reconnection
7 A7
condition
A. Video error_ Color error
8 Adjustment Test pattern - ADJ Key A15
Exchange Main Board (1) A-1/5
Exchange Main Board (2) A-2/5
9 Defected Type caused by T-Con/ Exchange Power Board (PSU) A-3/5
Power / Module
Exchange Module (1) A-4/5
Exchange Module (2) A-5/5
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Contents of Standard Repair Process Detail Technical Manual
Continued from previous page
No. Error symptom Content Page Remarks
10 Check front display LED A8
B. Power error_ No power
11 Check power input Voltage & ST-BY 3.5V A9
B. Power error_Off when on, off
12 POWER OFF MODE checking method A10
while viewing
Checking method in menu when there is
13 A11
C. Audio error_ No audio/Normal no audio
video Voltage and speaker checking method
14 A12
when there is no audio
Remote control operation checking
15 A13
method
D. Function error
Motion Remote operation checking
16 A14
method
17 E. Etc Adjustment Test pattern A15
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Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
symptom A. Video error_ videoX / audio O date
Revised
Content Vx1 Lock check date A1
R7277 : 0[V]
Check a voltage of R7277 after turn on the TV.
If the voltage is low, Vx1 is locked.(OK)
A1
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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 12.
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
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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 input signal strength checking method Revised
Content date A3
All Settings Channels Channel Tuning
Manual Tuning
When the signal is strong,
use the attenuator (-10dB, -
15dB, -20dB etc.)
A3
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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 check date A4
Version
Push instart button
A4
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Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error
Error Established
symptom
symptom
A.
A. Video
Video error_Video
error_Video error,
error, video
video lag/stop
lag/stop
TV date
Content Revised
Content TUNER
Tunerchecking
Checkingpart
Part A5
date
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
Error A. Videoerror
A. Video error_Vertical/Horizontal
_Vertical/Horizontalbar,
bar, Established
symptom
symptom residual image,
residual light spot
image, light spot date
Content Revised
Content TV connection
Connection diagram
diagram date A6
As the part connecting to the external input, check
the screen condition by signal
A6
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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) reconnection condition date A7
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.
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 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)
Vertical abnormal display Brightness difference Line Dim
Crosstalk Press damage Crosstalk
Burnt
A - 4/5
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Appendix : Exchange the Module (2)
Angle view Color difference Brightness dot noise Half dead
Brightness difference Green Noise on power on/off time Line 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 A8
date
ST-BY condition: On or Off
Power ON condition: Turn Off
A8
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Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error
Error Established
symptom
symptom
B. Power
B. Power errorerror
_Off_No power
when on, off whiling viewing
TV date
Content Revised
Content Check power
Check inputinput
power voltage and ST-BY
Voltage 3.5V 3.5V
& ST-BY A9
A18
date
Check the DC 12VM line for ST-BY Voltage Power To Main B’d
(ST-BY : 7.8V, Normal : 12V)
P202
Power To Module
P201
A9
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Standard Repair Process Detail Technical Manual
Error Established
symptom B.B. Power
Power error
error _Off _Off
whenwhen
on, offon,
whiling viewingviewing
off whiling date
TV
Content POWER
POWEROFF
OFFMODE
MODEchecking
checkingmethod
method A10
A19
Entry method
1. Press the IN-START button of the remote control for adjustment
2. Check the entry into adjustment item 3 (Power On/Off Status)
A10
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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 A11
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
A11
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Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
Established
symptom C.C. Audio
Audio error_No
error_No audio/Normal
audio/Normal video
video date
date
TV Revised
Revised
Content Voltage and and
Voltage speaker checking
speaker method
checking method A12
A21
when there
when is noisaudio
there no audio date
date
①
② ②
1 SPK_R-
SPK_R-_FT 2 SPK_R+
SPK_R+_FT
3 SPK_L-
SPK_L-_FT 4 SPK_L+
SPK_L+_FT
Checking order when there is no audio
① Check the contact condition of or 20V connector of Main Board
② Measure the 20V 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.
A12
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Standard Repair Process Detail Technical Manual
Error Established
D.D.Function
Functionerror
error
symptom date
TV Revised
Content Remote
Remote control
controller operation
operation checking
checking method
method date A22
A13
① IR & EYE Sensor
① Pin Pin name
1 GND
2 KEY1
3 KEY2
4 +3.5V_ST
5 GND
6 LOGO_LIGHT
7 IR
8 GND
9 EYE_SCL
10 EYE_SDA
Checking order to check remote control
1. Check IR cable condition between IR & Main board.( Check picture number① and ②)
2. Check the standby 3.5V on the terminal 22 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.
A13
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Only for training and service purposes.
Standard Repair Process Detail Technical Manual
Error Established
D.D.Function
Functionerror
error
symptom date
TV Revised
Content Motion Remote
Wifi
Motion operation
operation
Remote checking
checking
operation method
method
checking method date A14
A23
A24
① Wifi & BT Front Pin Pin name
1 GND
2 BT_RESET
3 N.C
4 WOL/WIFI_POWER_ON
5 GND
6 WIFI_DP
7 WIFI_DM
8 +3.5V_WIFI
Wifi & BT Rear
③
Checking order
1.Check BT/Wifi cable condition between BT/Wifi assy & Main board.
2.Check the 3.5V on the terminal 6
A14
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Standard Repair Process Detail Technical Manual
Error Established
symptom
E. Etc
date
Revised
Content Adjustment Test pattern date A15
Press the P-ONLY HDMI HOT CH + or -
You can view 11 types of patterns using the CH+ or - 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!)
A15
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Only for training and service purposes.
