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Internal Use Only
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LED TV
SERVICE MANUAL
CHASSIS : LJ48V

MODEL : 55UB8300 55UB8300-SG
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

P/NO : MFL68439702 (1407-REV00) Printed in Korea
CONTENTS

CONTENTS .............................................................................................. 2

PRODUCT SAFETY ................................................................................. 3

SPECIFICATION ....................................................................................... 6

ADJUSTMENT INSTRUCTION .............................................................. 15

EXPLODED VIEW .................................................................................. 25

SCHEMATIC CIRCUIT DIAGRAM ..............................................................

Copyright © LG Electronics. Inc. All rights reserved. -2- LGE Internal Use Only
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
Schematic Diagram and 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 M and 5.2 M.
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.

Copyright © LG Electronics. Inc. All rights reserved. -3- LGE Internal Use Only
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 ES
on page 3 of this publication, always follow the safety precautions. devices.
Remember: Safety First. 4. Use only an anti-static type solder removal device. Some solder
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 mod- 6. Do not remove a replacement ES device from its protective
ule or any other receiver assembly. package until immediately before you are ready to install it.
b. Disconnecting or reconnecting any receiver electrical plug or (Most replacement ES devices are packaged with leads electri-
other electrical connection. cally 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 material
installation of electrolytic capacitors may result in an explo- to the chassis or circuit assembly into which the device will be
sion hazard. installed.
2. Test high voltage only by measuring it with an appropriate CAUTION: Be sure no power is applied to the chassis or circuit,
high voltage meter or other voltage measuring device (DVM, 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 appropriate
(by volume) isopropyl alcohol (90 % - 99 % strength) tip size and shape that will maintain tip temperature within the
CAUTION: This is a flammable mixture. range or 500 °F to 600 °F.
Unless specified otherwise in this service manual, lubrication of 2. Use an appropriate gauge of RMA resin-core solder composed
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 are Do not use freon-propelled spray-on cleaners.
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 against
ily by static electricity. Such components commonly are called 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 discharging
wrist strap device, which should be removed to prevent poten-
tial shock reasons prior to applying power to the unit under test.

Copyright © LG Electronics. Inc. All rights reserved. -4- LGE Internal Use Only
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 whenever
gently prying up on the lead with the soldering iron tip as the 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 remaining good copper pattern. Solder the overlapped area and clip off
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.

Copyright © LG Electronics. Inc. All rights reserved. -5- LGE Internal Use Only
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 spec sheet is applied to the LED TV used LJ48V chassis 1) Performance: LGE TV test method followed
2) Demanded other specification
- Safety : CE, IEC specification
- EMC: CE, IEC
2. Test condition
Each part is tested as below without special notice.

1) Temperature : 25 ºC ± 5 ºC(77±9ºF), CST : 40 ºC±5 ºC
2) Relative Humidity: 65 % ± 10 %
3) Power 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. General Specification
No Item Specification Remark
1. Display Screen Device 84" wide Color Display Module Resolution: 3840*2160
79" wide Color Display Module
60" wide Color Display Module
55" wide Color Display Module
49" wide Color Display Module
2. Aspect Ratio 16:9 All
3 LCD Module 79" QWUXGA TFT LCD LC790EQF-FGF1
84" TFT WUXGA LCD LC840EQD-SGF1
65" QWUXGA TFT LCD LC650EQF-FGF1,
LC650CQN-FGF1),,
LC650EQF-FGF1
60" QWUXGA TFT LCD LCQ600EQE-PGF1
55" QWUXGA TFT LCD LC550EQE-PGF2 ,
LC550CQN-FGF1
49" QWUXGA TFT LCD LC490EQE-XGF2
42" QWUXGA TFT LCD LC420EQE-PGM1
40" QWUXGA TFT LCD V400DK1-KE1
4. Operating Environment TFT Temp. : 0 ~ 50 deg LGE SPEC
Humidity : 10 ~ 90%
5. Storage Environment TFT Temp. : -20 ~ 60 deg Only 84" , LGD SPEC
Humidity : 10 ~ 90%
TFT Temp. : -20 ~ 60 deg LGE SPEC
Humidity : 5 ~ 90%RH
6. Input Voltage AC100 ~ 240V, 50/60Hz

Copyright © LG Electronics. Inc. All rights reserved. -6- LGE Internal Use Only
Only for training and service purposes
5. External Input Support Format
5.1. CVBS input
No Resolution H-freq(kHz) V-freq.(kHz) Pixel clock Proposed Remarks
1. 720*480i 15.73 59.94 13.500 SDTV, DVD 480I(525I) NTSC-M
2. 720*480i 15.73 60.00 13.514 SDTV, DVD 480I(525I) NTSC-M
3. 720*576i 15.625 50.00 13.500 SDTV, DVD 576I(625I) 50Hz PAL-BDGHI

5.2. Component (Y, PB, PR)
No Resolution H-freq(kHz) V-freq.(kHz) Pixel clock Proposed
1. 720*480i 15.73 59.94 13.50 SDTV, DVD 480I(525I)
2. 720*480i 15.73 60.00 13.51 SDTV, DVD 480I(525I)
3. 720*576i 15.63 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 45.00 50.00 74.25 HDTV 720P 50Hz
10. 1920*1080 28.13 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 67.50 60.00 148.50 HDTV 1080P

Copyright © LG Electronics. Inc. All rights reserved. -7- LGE Internal Use Only
Only for training and service purposes
5.3. HDMI Input (DTV)
Pixel
No Resolution H-freq(kHz) V-freq.(Hz) Proposed Remark
clock(MHz)
1 640*480 31.47 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) Spec. out but display
4 720*480 15.75 60.00 13.51 SDTV, DVD 480I(525I)
5 720*576 15.63 50.00 13.50 SDTV, DVD 576I(625I) 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 28.13 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 23.98 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
22 3840*2160 53.95 23.98 297.00 UDTV 2160P
23 3840*2160 54.00 24.00 297.00 UDTV 2160P
24 3840*2160 56.25 25.00 297.00 UDTV 2160P
25 3840*2160 61.43 29.97 297.00 UDTV 2160P
26 3840*2160 67.50 30.00 297.00 UDTV 2160P
27 3840*2160 112.50 50.00 594.00 UDTV 2160P 8 bit / YCbCr 4:2:0
28 3840*2160 135.00 59.94 593.41 UDTV 2160P 8 bit / YCbCr 4:2:0
29 3840*2160 135.00 60.00 594.00 UDTV 2160P 8 bit / YCbCr 4:2:0
30 4096*2160 53.95 23.98 297.00 UDTV 2160P
31 4096*2160 54.00 24.00 297.00 UDTV 2160P
32 4096*2160 56.25 25.00 297.00 UDTV 2160P
33 4096*2160 61.43 29.97 297.00 UDTV 2160P
34 4096*2160 67.50 30.00 297.00 UDTV 2160P
35 4096*2160 112.50 50.00 594.00 UDTV 2160P 8 bit / YCbCr 4:2:0
36 4096*2160 135.00 59.94 593.41 UDTV 2160P 8 bit / YCbCr 4:2:0
37 4096*2160 135.00 60.00 594.00 UDTV 2160P 8 bit / YCbCr 4:2:0

Copyright © LG Electronics. Inc. All rights reserved. -8- LGE Internal Use Only
Only for training and service purposes
5.4. HDMI Input (PC)
No. Resolution H-freq(kHz) V-freq.(kHz) Pixel clock Proposed
1 640*350 31.47 70.09 25.17 EGA
2 720*400 31.47 70.08 28.32 DOS
3 640*480 31.47 59.94 25.17 VESA(VGA)
4 800*600 37.88 60.32 40.00 VESA(SVGA)
5 1024*768 48.36 60.00 65.00 VESA(XGA)
6 1360*768 47.71 60.02 84.75 VESA(WXGA)
7 1152*864 54.35 60.05 80.00 VESA
8 1280*1024 63.98 60.02 109.00 SXGA
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 23.98 297.00 UDTV 2160P
14 4096*2160 54.00 24.00 297.00 UDTV 2160P

Copyright © LG Electronics. Inc. All rights reserved. -9- LGE Internal Use Only
Only for training and service purposes
6. 3D mode(UB83** Only)
6.1. RF Input
No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) 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

6.2. HDMI Input
6.2.1. HDMI1.4/2.0 (3D supported mode manually)
No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed 3D input proposed mode
1 720*480 31.5 60 27.03 SDTV 480P 2D to 3D, Side by Side(Half),
Top & Bottom, Checker Board,
2 720*576 31.25 50 27 SDTV 576P
Frame Sequential, Row Interleaving,
3 1280*720 45.00 60.00 74.25 HDTV 720P Column Interleaving
37.500 50 74.25 HDTV 720P
4 1920*1080 33.75 60.00 74.25 HDTV 1080I 2D to 3D, Side by Side(Half), Top & Bottom
28.125 50.00 74.25 HDTV 1080I
5 1920*1080 27.00 24.00 74.25 HDTV 1080P 2D to 3D, Side by Side(Half), Top & Bottom,
Checker Board, Row Interleaving, Column
28.12 25 74.25 HDTV 1080P
Interleaving
33.75 30.00 74.25 HDTV 1080P
67.50 60.00 148.5 HDTV 1080P 2D to 3D, Side by Side(Half),
Top & Bottom,
56.250 50 148.5 HDTV 1080P
Checker Board, Single Frame Sequential,
Row Interleaving, Column Interleaving

6 3840*2160 53.95 23.976 297.00 HDTV 2160P 2D to 3D,
Top & Bottom(half), Side by Side(half),
54 24.00 296.703
56.25 25.00 297.00
61.43 29.970 297.00
67.5 30.00 296.703
7 4096*2160 112.50 50.00 594.00 HDTV 2160P 2D to 3D,
Top & Bottom(half), Side by Side(half)
135.00 60.00 594.00
(8 bit, YCbCr 4:2:0)

Copyright © LG Electronics. Inc. All rights reserved. - 10 - LGE Internal Use Only
Only for training and service purposes
6.2.2. HDMI Input 1.4b (3D supported mode automatically)
No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock VIC 3D input proposed Proposed
(MHz) mode
1 640*480 31.469 / 31.5 59.94/ 60 25.125/25.2 1 Top-and-Bottom Secondary(SDTV 480P)
Side-by-side(half) Secondary(SDTV 480P)
31.469 / 31.5 59.94/ 60 50.35/50.4 1 Side-by-side(Full) (SDTV 480P)
62.938/63 59.94/ 60 50.35/50.4 1 Frame packing Secondary(SDTV 480P)
Line alternative (SDTV 480P)
2 720*480 31.469 / 31.5 59.94 / 60 27.00/27.03 2,3 Top-and-Bottom Secondary(SDTV 480P)
Side-by-side(half) Secondary(SDTV 480P)
31.469 / 31.5 59.94 / 60 54/54.06 2,3 Side-by-side(Full) (SDTV 480P)
62.938/63 59.94 / 60 54/54.06 2,3 Frame packing Secondary(SDTV 480P)
Line alternative (SDTV 480P)
3 720*576 31.25 50 27 17,18 Top-and-Bottom Secondary(SDTV 576P)
Side-by-side(half) Secondary(SDTV 576P)
31.25 50 54 17,18 Side-by-side(Full) (SDTV 576P)
62.5 50 54 17,18 Frame packing Secondary(SDTV 576P)
Line alternative (SDTV 576P)
4 720*576 15.625 50 27 21 Frame packing Secondary(SDTV 576I)
Field alternative (SDTV 576I
Side-by-side(Full) (SDTV 576I
Top-and-Bottom Secondary(SDTV 576I)
Side-by-side(half) Secondary(SDTV 576I)
5 1280*720 37.500 50 74.25 19 Top-and-Bottom Primary(HDTV 720P)
Side-by-side(half) Primary(HDTV 720P)
37.500 50 148.5 19 Side-by-side(Full) (HDTV 720P)
44.96 / 45 59.94 / 60 74.17/74.25 4 Top-and-Bottom Primary(HDTV 720P)
Side-by-side(half) Primary(HDTV 720P)
44.96 / 45 59.94 / 60 148.35/148.5 4 Side-by-side(Full) (HDTV 720P)
75 50 148.5 19 Frame packing Primary(HDTV 720P)
Line alternative (HDTV 720P)
89.91/90 59.94 / 60 148.35/148.5 4 Frame packing Primary(HDTV 720P)
Line alternative (HDTV 720P)
6 1920*1080 28.125 50.00 74.25 20 Top-and-Bottom Secondary(HDTV 1080I)
Side-by-side(half) Primary(HDTV 1080I)

28.125 50.00 148.5 20 Side-by-side(Full) (HDTV 1080I)
33.72 / 33.75 59.94 / 60 74.17/74.25 5 Top-and-Bottom Secondary(HDTV 1080I)
Side-by-side(half) Primary(HDTV 1080I)
33.72 / 33.75 59.94 / 60 148.35/148.5 5 Side-by-side(Full) (HDTV 1080I)
56.25 50.00 148.5 20 Frame packing Primary(HDTV 1080I)
Field alternative (HDTV 1080I)
67.432/67.50 59.94 / 60 148.35/148.5 5 Frame packing Primary(HDTV 1080I)
Field alternative (HDTV 1080I)

Copyright © LG Electronics. Inc. All rights reserved. - 11 - LGE Internal Use Only
Only for training and service purposes
No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock VIC 3D input proposed Proposed
(MHz) mode
7 1920*1080 26.97 / 27 23.97 / 24 74.17/74.25 32 Top-and-Bottom Primary(HDTV 1080P)
Side-by-side(half) Primary(HDTV 1080P)
26.97 / 27 23.97 / 24 148.35/148.5 32 Side-by-side(Full) (HDTV 1080P)
28.125 25 74.25 33 Top-and-Bottom Secondary(HDTV 1080P)
Side-by-side(half) Secondary(HDTV 1080P)
28.125 25 148.5 33 Side-by-side(Full) (HDTV 1080P)
33.716 / 33.75 29.976 / 30.00 74.18/74.25 34 Top-and-Bottom Primary(HDTV 1080P)
Side-by-side(half) Secondary(HDTV 1080P)
33.716 / 33.75 29.976 / 30.00 148.35/148.5 34 Side-by-side(Full) (HDTV 1080P)
43.94/54 23.97 / 24 148.35/148.5 32 Frame packing Primary(HDTV 1080P)
Line alternative (HDTV 1080P)
56.25 25 148.5 33 Frame packing Secondary(HDTV 1080P)
Line alternative (HDTV 1080P)
67.432 / 67.5 29.976 / 30.00 148.35/148.5 34 Frame packing Primary(HDTV 1080P)
Line alternative (HDTV 1080P)
56.250 50 148.5 31 Top-and-Bottom Primary(HDTV 1080P)
Side-by-side(half) Secondary(HDTV 1080P)
67.432 / 67.5 59.94 / 60 148.35/148.50 16 Top-and-Bottom Primary(HDTV 1080P)
Side-by-side(half) Secondary(HDTV 1080P)

6.2.3. HDMI-PC 3D Input (3D supported mode manually)

No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) 3D input proposed mode Proposed
1 1024*768 48.36 60 65 2D to 3D, HDTV 768P
Side by Side(half), Top & Bottom
2 1360*768 47.71 60 85.5 2D to 3D, HDTV 768P
Side by Side(half), Top & Bottom
3 3840*2160 54 24.00 296.703 2D to 3D, HDTV 2160P
Top & Bottom(half),
56.25 25.00 297
Side by Side(half)
67.5 30.00 296.703
4 4096*2160 54 24.00 297.00 2D to 3D, HDTV 2160P
Side by Side(half), Top & Bottom
5 Others - - - 2D to 3D, 640*350
Side by Side(half), Top & Bottom 720*400
640*480
800*600
1152*864

Copyright © LG Electronics. Inc. All rights reserved. - 12 - LGE Internal Use Only
Only for training and service purposes
6.2.4. Component 3D Input (3D supported mode manually)

No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) 3D input proposed mode Proposed
1 1280*720 37.5 50 74.25 2D to 3D, HDTV 720P
Side by Side(half), Top & Bottom
2 1280*720 45.00 60.00 74.25 2D to 3D, HDTV 720P
Side by Side(half), Top & Bottom
3 1280*720 44.96 59.94 74.176 2D to 3D, HDTV 720P
Side by Side(half), Top & Bottom
4 1920*1080 33.75 60.00 74.25 2D to 3D, HDTV 1080I
Side by Side(half), Top & Bottom
5 1920*1080 33.72 59.94 74.176 2D to 3D, HDTV 1080I
Side by Side(half), Top & Bottom
6 1920*1080 28.12 50 74.25 2D to 3D, HDTV 1080I
Side by Side(half), Top & Bottom
7 1920*1080 67.500 60 148.50 2D to 3D, HDTV 1080P
Side by Side(half), Top & Bottom
8 1920*1080 67.432 59.94 148.352 2D to 3D, HDTV 1080P
Side by Side(half), Top & Bottom
9 1920*1080 27.000 24.000 74.25 2D to 3D, HDTV 1080P
Side by Side(half), Top & Bottom
10 1920*1080 28.12 25 74.25 2D to 3D, HDTV 1080P
Side by Side(half), Top & Bottom
11 1920*1080 56.25 50 74.25 2D to 3D, HDTV 1080P
Side by Side(half), Top & Bottom
12 1920*1080 26.97 23.976 74.176 2D to 3D, HDTV 1080P
Side by Side(half), Top & Bottom
13 1920*1080 33.75 30.000 74.25 2D to 3D, HDTV 1080P
Side by Side(half), Top & Bottom
14 1920*1080 33.71 29.97 74.176 2D to 3D, HDTV 1080P
Side by Side(half), Top & Bottom

Copyright © LG Electronics. Inc. All rights reserved. - 13 - LGE Internal Use Only
Only for training and service purposes
6.2.5. USB, DLNA Movie (3D) (3D supported mode manually)
No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) 3D input proposed mode
1 Under 704x480 - - - 2D to 3D
2 Over 704x480 - - - 2D to 3D, Side by Side(Half), Top & Bottom
interlaced
3 Over 704x480 - 50 / 60 - 2D to 3D, Side by Side(Half), Top & Bottom,
progressive Checker Board, Row Interleaving, Column Interleaving,
Frame Sequential
4 - others - 2D to 3D, Side by Side(Half), Top & Bottom,
Checker Board, Row Interleaving, Column Interleaving
5 Over 2160P - 24/25/30 - 2D to 3D, Side by Side(Half), Top & Bottom

6.2.6. USB, DLNA -Photo (3D) (3D supported mode manually)

No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) 3D input proposed mode
1 Under 320x240 - - - 2D to 3D
2 Over 320x240 - - - 2D to 3D, Side by Side(Half), Top & Bottom

6.2.7. USB, DLNA (3D) (3D supported mode automatically)

No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) 3D input proposed mode
1 1080p 33.75 30 74.25 Side by Side(Half), Top & Bottom, Checker Board,
MPO(Photo), JPS(Photo)
2 2160p 67.50 30.00 297.00

6.2.8. Miracast, Widi (3D supported mode manually)

No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) 3D input proposed mode
1 1024*768p - 30/60 - 2D to 3D, Side by Side(Half), Top & Bottom
2 1280*720p - 30/60 -
3 1920*1080p - 30/60 -
4 Others - - - 2D to 3D

**Remark: 3D Input mode

No. Side by Side Top & Bottom Checkerboard Single Frame Frame Packing Line Column
Sequential Interleaving Interleaving
1

L R LLLLL R
L
R
L

Copyright © LG Electronics. Inc. All rights reserved. - 14 - LGE Internal Use Only
Only for training and service purposes
ADJUSTMENT INSTRUCTION
1. Application Range 4. Automatic Adjustment
This spec. sheet applies to LJ48V Chassis applied LED TV all 4.1. ADC Adjustment
models manufactured in TV factory ADC adjustment is needed to find the optimum black level and
gain in Analog-to-Digital device and to compensate RGB
deviation.
2. Specification. 4.1.1. Equipment & Condition
(1) Because this is not a hot chassis, it is not necessary to use (1) USB to RS-232C Jig
an isolation transformer. However, the use of isolation (2) MSPG-925 Series Pattern Generator(MSPG-925FA,
transformer will help protect test instrument pattern -65)
(2) Adjustment must be done in the correct order. - Resolution : 480i Comp1
(3) The adjustment must be performed in the circumstance of 1080P Comp1
25 ±5ºC of temperature and 65±10% of relative humidity if - Pattern : Horizontal 100% Color Bar Pattern
there is no specific designation - Pattern level : 0.7±0.1 Vp-p
(4) The input voltage of the receiver must keep 100~240V, - Image
50/60Hz
(5) The receiver must be operated for about 5 minutes prior to
the adjustment when module is in the circumstance of over
15ºC

In case of keeping module is in the circumstance of 0°C, it
should be placed in the circumstance of above 15°C for 2
hours
In case of keeping module is in the circumstance of below
-20°C, it should be placed in the circumstance of above 15°C
for 3 hours
4.1.2. Adjustment method
* Caution) When still image is displayed for a period of 20
minutes or longer (especially where W/B scale is Protocol Command Set ACK
strong. Digital pattern 13ch and/or Cross hatch Enter adj. mode aa 00 00 a 00 OK00x
pattern 09ch), there can some afterimage in the Source change xb 00 40 b 00 OK04x (Adjust 480i, 1080p Comp1 )
black level area. xb 00 60 b 00 OK06x (Adjust 1920*1080 RGB)
Begin adj. ad 00 10
Return adj. result OKx (Case of Success)
3. Adjustment items NGx (Case of Fail)
3.1. Main PCB check process Read adj. data (main) (main)
MAC Address Download ad 00 20 000000000000000000000000007c007b-
ADC adjustment : 480i Comp1, 1920*1080 Comp1 006dx
EDID/DDC download
Above adjustment items can be also performed in Final (sub ) (Sub)
Assembly if needed. Both Board-level and Final assembly ad 00 21 000000070000000000000000007c0083
adjustment items can be check using In-Start Menu 1.ADJUST 0077x
CHECK. Confirm adj. ad 00 99 NG 03 00x (Fail)
NG 03 01x (Fail)
3.2. Final assembly adjustment NG 03 02x (Fail)
White Balance adjustment OK 03 03x (Success)
RS-232C functionality check End adj. ad 00 90 a 00 OK90x
PING Test
Factory Option setting per destination Ref.) ADC Adj. RS232C Protocol_Ver1.0
Ship-out mode setting (In-Stop)
Adj. order
3.3. Etc. aa 00 00 [Enter ADC adj. mode]
Ship-out mode xb 00 04 [Change input source to Component1(480i&1080p)]
Service Option Default ad 00 10 [Adjust 480i&1080p Comp1]
USB Download(S/W Update, Option, Service only) xb 00 06 [Change input source to RGB(1024*768)]
ISP Download (Option) ad 00 10 [Adjust 1920*1080 RGB]
aa 00 90 End adj.

Copyright © LG Electronics. Inc. All rights reserved. - 15 - LGE Internal Use Only
Only for training and service purposes
4.2. MAC address, ESN, Widevine, HDCP2.0 4.3. LAN Inspection
key D/L 4.3.1. Equipment & Condition
4.2.1. Equipment & Condition Each other connection to LAN Port of IP Hub and Jig
1) Play file: keydownload.exe

4.2.2. Communication Port connection
1) Key Write: Com 1,2,3,4 and 115200 (Baudrate)
2) Barcode: Com 1,2,3,4 and 9600 (Baudrate)

4.2.3. Download process
1) Select the download items.
2) Mode check: Online Only
3) Check the test process : DETECT -> MAC -> Widevine
4) Play: START
5) Check of result: Ready, Test, OK or NG
4.3.2. LAN inspection solution
4.2.4. Communication Port connection LAN Port connection with PCB
1) ) Connect: PCBA Jig -> RS-232C Port == PC -> RS-232C Network setting at MENU Mode of TV
Port Setting automatic IP
Setting state confirmation
- If automatic setting is finished, you confirm IP and MAC
Address.

4.2.5. Download
1) TW/CO Models (14Y LCD TV + MAC + Widevine + ESN +
HDCP2.0) 4.3.3. LAN PORT INSPECTION (PING TEST)

1) Play the LAN Port Test PROGRAM.
2) Input IP set up for an inspection to Test
Program.
*IP Number : 12.12.2.2.

Copyright © LG Electronics. Inc. All rights reserved. - 16 - LGE Internal Use Only
Only for training and service purposes
4.3.4. LAN PORT inspection (PING TEST) * Manual Download (Model Name and Serial Number)
1) Play the LAN Port Test Program.
2) connect each other LAN Port Jack. If the TV set is downloaded By OTA or Service man,
3) Play Test (F9) button and confirm OK Message. sometimes model name or serial number is initialized. ( not
4) remove LAN CABLE always)
It is impossible to download by bar code scan, so It need
Manual download.

a. Press the `INSTART' key of ADJ remote controller.
b. Go to the menu `7. Model Number D/L' like below photo.
c. Input the Factory model name or Serial number like below
photo.

d. Check the model name INSTART menu -> Factory name
4.4. Model name & Serial number Download displayed
4.4.1. Model name & Serial number D/L e. Check the Diagnostics (DTV country only) -> Buyer model
Press "Power on" key of service remocon.(Baud rate : displayed
115200 bps)
Connect RS-232C Signal to USB Cable to USB. 4.5. WIFI MAC ADDRESS CHECK
Write Serial number by use USB port.
Must check the serial number at Instart menu. 4.5.1. Using RS232 Command
Command Set ACK
Method & Notice
Transmission [A][l][][Set ID][][20][Cr] [O][K][x] or [N][G]
A. Serial number D/L is using of scan equipment.
Check the menu on in-start
B. Setting of scan equipment operated by Manufacturing
Technology Group.
C. Serial number D/L must be conformed when it is produced
in production line, because serial number D/L is mandatory
by D-book 4.0

Copyright © LG Electronics. Inc. All rights reserved. - 17 - LGE Internal Use Only
Only for training and service purposes
5. Manual Adjustment 5.2.4. EDID DATA
Reference
5.1. ADC adjustment is not needed because of