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LED TV
SERVICE MANUAL
CHASSIS : LJ31A

MODEL : 24LN451B 24LN451B-PU



CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.




P/NO : MFL67234649 (1308-REV00) Printed in Korea
CONTENTS



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

SAFETY PRECAUTIONS ......................................................................... 3

SERVICING PRECAUTIONS.................................................................... 4

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

ADJUSTMENT INSTRUCTION ................................................................ 9

TROUBLE SHOOTING ........................................................................... 13

BLOCK DIAGRAM.................................................................................. 20

EXPLODED VIEW .................................................................................. 21

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




Copyright © LG Electronics. Inc. All right 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 1.5K/10watt resistor in parallel with a 0.15uF 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, 0.5mA.
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 1W), keep the resistor 10mm away from PCB.
Leakage Current Hot Check circuit
Keep wires away from high voltage or high temperature parts.
AC Volt-meter
Before returning the receiver to the customer,

always perform an AC leakage current check on the exposed
Good Earth Ground
metallic parts of the cabinet, such as antennas, terminals, etc., to such as WATER PIPE,
be sure the set is safe to operate without damage of electrical To Instrument's
0.15µF
CONDUIT etc.
exposed
shock. METALLIC PARTS


Leakage Current Cold Check(Antenna Cold Check) 1.5 Kohm/10W
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 When 25A is impressed between Earth and 2nd Ground
plug prongs tied together and touch other ohm-meter lead in turn to for 1 second, Resistance must be less than 0.1
each exposed metallic parts such as antenna terminals, phone *Base on Adjustment standard
jacks, etc.
If the exposed metallic part has a return path to the chassis, the
measured resistance should be between 1M and 5.2M.
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 right reserved. -3- LGE Internal Use Only
Only for training and service purposes
SERVICING PRECAUTIONS
CAUTION: Before servicing receivers covered by this service unit under test.
manual and its supplements and addenda, read and follow the 2. After removing an electrical assembly equipped with ES
SAFETY PRECAUTIONS on page 3 of this publication. devices, place the assembly on a conductive surface such as
NOTE: If unforeseen circumstances create conflict between the aluminum foil, to prevent electrostatic charge buildup or
following servicing precautions and any of the safety precautions on exposure of the assembly.
page 3 of this publication, always follow the safety precautions. 3. Use only a grounded-tip soldering iron to solder or unsolder ES
Remember: Safety First. devices.
4. Use only an anti-static type solder removal device. Some solder
General Servicing Precautions removal devices not classified as "anti-static" can generate
1. Always unplug the receiver AC power cord from the AC power electrical charges sufficient to damage ES devices.
source before; 5. Do not use freon-propelled chemicals. These can generate
a. Removing or reinstalling any component, circuit board electrical charges sufficient to damage ES devices.
module or any other receiver assembly. 6. Do not remove a replacement ES device from its protective
b. Disconnecting or reconnecting any receiver electrical plug or package until immediately before you are ready to install it.
other electrical connection. (Most replacement ES devices are packaged with leads
c. Connecting a test substitute in parallel with an electrolytic electrically shorted together by conductive foam, aluminum foil
capacitor in the receiver. or comparable conductive material).
CAUTION: A wrong part substitution or incorrect polarity 7. Immediately before removing the protective material from the
installation of electrolytic capacitors may result in an leads of a replacement ES device, touch the protective material
explosion hazard. to the chassis or circuit assembly into which the device will be
installed.
2. Test high voltage only by measuring it with an appropriate high CAUTION: Be sure no power is applied to the chassis or circuit,
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
Do not test high voltage by "drawing an arc". replacement ES devices. (Otherwise harmless motion such as
3. Do not spray chemicals on or near this receiver or any of its the brushing together of your clothes fabric or the lifting of your
assemblies. foot from a carpeted floor can generate static electricity
4. Unless specified otherwise in this service manual, clean sufficient 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% (by 1. Use a grounded-tip, low-wattage soldering iron and appropriate
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 1.25cm) 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 easily b. First, hold the soldering iron tip and solder the strand against
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 and component lead and the printed circuit foil, and hold it there
semiconductor "chip" components. The following techniques only until the solder flows onto and around both the
should be used to help reduce the incidence of component component lead and the foil.
damage 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. splashed solder with a small wire-bristle brush.
Alternatively, obtain and wear a commercially available
discharging wrist strap device, which should be removed to
prevent potential shock reasons prior to applying power to the

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

Power Output, Transistor Device 1. Remove the defective copper pattern with a sharp knife.
Removal/Replacement Remove at least 1/4 inch of copper, to ensure that a hazardous
1. Heat and remove all solder from around the transistor leads. condition will not exist if the jumper wire opens.
2. Remove the heat sink mounting screw (if so equipped). 2. Trace along the copper pattern from both sides of the pattern
3. Carefully remove the transistor from the heat sink of the circuit break and locate the nearest component that is directly
board. connected to the affected copper pattern.
4. Insert new transistor in the circuit board. 3. Connect insulated 20-gauge jumper wire from the lead of the
5. Solder each transistor lead, and clip off excess lead. nearest component on one side of the pattern break to the lead
6. Replace heat sink. of the nearest component on the other side.
Carefully crimp and solder the connections.
Diode Removal/Replacement CAUTION: Be sure the insulated jumper wire is dressed so the
1. Remove defective diode by clipping its leads as close as it does not touch components or sharp edges.
possible to diode body.
2. Bend the two remaining leads perpendicular y to the circuit
board.
3. Observing diode polarity, wrap each lead of the new diode
around the corresponding lead on the circuit board.
4. Securely crimp each connection and solder it.
5. Inspect (on the circuit board copper side) the solder joints of
the two "original" leads. If they are not shiny, reheat them and if
necessary, apply additional solder.

Fuse and Conventional Resistor
Removal/Replacement
1. Clip each fuse or resistor lead at top of the circuit board hollow
stake.
2. Securely crimp the leads of replacement component around
notch at stake top.
3. Solder the connections.

Copyright © LG Electronics. Inc. All right 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
This spec sheet is applied all of the TV used LJ31A chassis.



2. Specification
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
(100 V - 240 V ~, 50 / 60 Hz)
· Standard Voltage of each products is marked by mod-
els
4) Specification and performance of each parts are followed
each drawing and specification by part number in accord-
ance with BOM.
5) The receiver must be operated for about 5 minutes prior to
the adjustment.



3.Test method
1) Performance : LGE TV test method followed
2) Demanded other specification
- Safety : CE,IEC specification
- EMC : CE,IEC specification




Copyright © LG Electronics. Inc. All right reserved. -6- LGE Internal Use Only
Only for training and service purposes
4. General specification
4.1. TV
No Item Specification Remarks

1 Market AMERICA, CANADA, MEXICO
2 Available Channel 1)Digital : ATSC
2)Analog : NTSC
3 Receiving system ATSC / NTSC-M
4 Component Input (1EA) Y/Cb/Cr , Y/Pb/Pr

5 CVBS Input (1EA) NTSC 1 System(Rear) : NTSC
CVBS Video input is used by common port with Component.
6 RGB Input RGB-PC Analog (D-SUB 15Pin)

7 HDMI Input (1EA) HDMI Rear / HDMI version 1.4/ support PC
Support HDCP
8 Audio Input (2EA) RGB/DVI Audio L/R Input
Component & CVBS CVBS Audio input is used by common port with Component.
9 USB (1EA) Picture, Music, Movie, SVC Software Update + Picture + Music + Movie

10 Local Key (Touch)


4.2. RGB/HDMI(PC) Specification
No Item Specification Remarks
1 Supported Sync. Type Separate Sync., Digital
2 Operating Frequency Analog Horizontal 30 ~ 61 kHz
Vertical 56 ~ 75 Hz
Digital Horizontal 30 ~ 61 kHz
Vertical 56 ~ 75 Hz
3 Resolution Analog Max. 1366 x 768 @ 60Hz
Recommend 1366 x 768 @ 60Hz
Digital Max. 1366 x 768 @ 60Hz
Recommend 1366 x 768 @ 60Hz
4 Operating Environment Temp : 10 °C ~ 35 °C
Humidity : 20 % ~ 80 %
5 Storage Environment Temp : -10 °C ~ 60 °C non condensing
Humidity : 5 % ~ 90 % non condensing




Copyright © LG Electronics. Inc. All right reserved. -7- LGE Internal Use Only
Only for training and service purposes
5. Timing
5.1. RGB/ HDMI (PC)
No. Resolution H-freq(kHz) V-freq(Hz) Pixel clock(MHz) Remark
1 720*400 31.468 70.080 28.321
2 640*480 31.469 59.940 25.175
3 640*480 37.500 75.000 31.500
4 800*600 37.879 60.317 40.000
5 800*600 46.875 75.000 49.500
6 1024*768 48.363 60.004 65.000
7 1024*768 60.023 75.029 78.750
8 1280*800 49.702 59.810 83.500
9 1366*768 47.717 59.79 85.5


5.2. HDMI (DTV)
No. Resolution H-freq(kHz) V-freq(Hz) Pixel clock(MHz) Remark
1 720* 480 31.469 / 31.5 59.94 / 60 27.00/ 27.03 SDTV 480P
2 720*576 31.25 50.00 27.864 SDTV 576P
3 1280*720 37.50 50.00 74.250 HDTV 720P
4 1280* 720 44.96 / 45 59.94 / 60 74.17/ 74.25 HDTV 720P
5 1920* 1080 33.72 / 33.75 59.94 / 60 74.17/ 74.25 HDTV 1080I
6 1920* 1080 28.125 50.00 74.25 HDTV 1080I
7 1920* 1080 27.00 24 74.25 HDTV 1080P
8 1920* 1080 33.75 30.00 74.25 HDTV 1080P
9 1920* 1080 56.250 50 148.5 HDTV 1080P
10 1920* 1080 67.43 / 67.5 59.94 / 60 148.35/ 148.50 HDTV 1080P


5.3. Component
Specification
No Remark
Resolution H-freq(kHz) V-freq(Hz) Pixel clock( MHz)
1 720* 480 15.730 59.940 13.500 SDTV, DVD 480I( 525I)
2 720* 480 15.750 60.000 13.514 SDTV, DVD 480I( 525I)
3 720* 576 15.625 50.000 13.500 SDTV, DVD 576I( 625I) 50Hz
4 720* 480 31.470 59.940 27.000 SDTV 480P
5 720* 480 31.500 60.000 27.027 SDTV 480P
6 720* 576 31.250 50.000 27.000 SDTV 576P 50Hz
7 1280* 720 44.960 59.940 74.176 HDTV 720P
8 1280* 720 45.000 60.000 74.250 HDTV 720P
9 1280* 720 37.500 50.000 74.250 HDTV 720P 50Hz
10 1920* 1080 33.720 59.940 74.176 HDTV 1080I
11 1920* 1080 33.750 60.000 74.250 HDTV 1080I
12 1920* 1080 28.125 50.000 74.250 HDTV 1080I 50Hz
13 1920* 1080 56.250 50 .000 148.500 HDTV 1080P
14 1920* 1080 67.432 59.940 148.350 HDTV 1080P
15 1920* 1080 67.5 00 60.000 148.500 HDTV 1080P



Copyright © LG Electronics. Inc. All right reserved. -8- LGE Internal Use Only
Only for training and service purposes
ADJUSTMENT INSTRUCTION
1. Application Range 4) Click "Read" tab, and then load download file(XXXX.bin) by
clicking "Read"
This document is applied to LJ31A chassis TV which is manu-
factured in TV (or Monitor) Factory or is produced on the basis (4)
of this data.
filexxx.bin


2. Designation
1) The adjustment is according to the order which is designat-
ed and which must be followed, according to the plan which
can be changed only on agreeing.
2) Power adjustment : Free Voltage.
3) Magnetic Field Condition: Nil. 5) Click "Auto" tab and set as below
4) Input signal Unit: Product Specification Standard. 6) Click "Run".
5) Reserve after operation: Above 5 Minutes (Heat Run) 7) After downloading, check "OK" message.
Temperature : at 25 °C ± 5 °C
Relative humidity : 65 % ± 10 % (5)
Input voltage : 220 V, 60 Hz
6) Adjustment equipments : Color Analyzer (CA-210 or CA- (5)
110), DDC Adjustment Jig equipment, SVC remote control-
ler. (7) ..........OK
7) Push The "IN STOP KEY" ­ For memory initialization
Case1 : Software version up (6)
1) After downloading S/W by USB , Multi-vision set will
reboot automatically
2) Push "In-stop" key
3) Push "Power on" key
4) Function inspection * USB DOWNLOAD(*.epk file download)
5) After function inspection, Push "In-stop" key. 1) Make New folder named "LG_DTV" and put ISP file(*.epk)
in the folder.
Case2 : Function check at the assembly line 2) Put the USB Stick to the USB socket.
1) When TV set is entering on the assembly line, Push "In- 3) Automatically detecting update file in USB Stick
stop" key at first. - If your downloaded program version in USB Stick is
2) Push "Power on" key for turning it on. Low, it didn't work. But your downloaded version is
If you push "Power on" key, TV set will recover channel High, USB data is automatically detecting.
information by itself. 4) Show the message "Copy the file from the Memory..."
3) After function inspection, Push "In-stop" key.




3. Main PCB check process
* APC - After Manual-Insult, executing APC
5) Updating is starting.

* Boot file Download
1) Execute ISP program "Mstar ISP Utility" and then click
"Config" tab.
2) Set as below, and then click "Auto Detect" and check "OK"
message. If display "Error", Check connect computer, jig,
and set.
3) Click "Connect" tab. If display "Can't ", Check connect 6) Updating Completed, The TV will restart automatically.
computer, jig, and set. 7) If your TV is turned on, check your updated version and
(1) (3) Tool option. (explain the Tool option, next stage)
* If downloading version is more high than your TV
Please Check the Speed :
have, TV can lost all channel data. In this case, you
Use the speed under have to channel recover. if all channel data is cleared,
200KHz. you didn't have a DTV/ATV test on production line.
(2) OK




Copyright © LG Electronics. Inc. All right reserved. -9- LGE Internal Use Only
Only for training and service purposes
3.1. EDID Process 3.1.2. RGB EDID Data
3.2.1. EDID download - Product ID:22984/HEXA: 59C8
1) Press "Power only" key of service remote control.
2) Press the ADJ KEY on R/C and enter EZ ADJUST
3) Enter EDID D/L mode by pushing "" key at "EDID D/L".
4) EDID download is executed automatically.
5) Press EXIT key on R/C.




*(week), **(year), ***(Check sum) : Adjustable Data
: Screen size, : Color Characteristics

3.2.3. HDMI EDID Data
- Product ID : 22986/HEXA:59CA



Caution: - Never connect HDMI & D-sub Cable when
download EDID.
- Download HDMI

* Edid data and Model option download (USB)
NO Item CMD CMD Data 0
1 2

Enter Download A A 0 0 When transfer the
download `Mode In' `Mode In',
MODE Carry the command.

EDID data and Download A E 00 10 Automatically download
Model option (The use of a internal
download Data)




*(week), **(year), ***(Check sum) : Adjustable Data
**** (physical address) : (HDMI : 10)
****(Check sum) : (HDMI : CE)
: Screen size, : Color Characteristics

3.3. Function Check
3.3.1. Check display and sound
*Check Input and Signal items. (cf. work instructions)
1) TV
2) AV (CVBS)
3) COMPONENT (480i)
4) RGB (PC : 1366 x 768 @ 60 Hz)
5) HDMI (PC : 1366 x 768 @ 60 Hz)
6) PC Audio In
* Display and Sound check is executed by Remote controller.

Caution : Not to push the INSTOP KEY after completion if
the function inspection.




Copyright © LG Electronics. Inc. All right reserved. - 10 - LGE Internal Use Only
Only for training and service purposes
4. Total Assembly line process 4.3. Function Check
4.1. Tool option & ADC Check 4.3.1. Check display and sound
1) Press "Power on" key of service remote control. *Check Input and Signal items. (cf. work instructions)
2) Connect RS232 Signal Cable to RS-232 Jack. 1) TV
3) Check the 'Tool Option' (Refer to the BOM Comments or 2) AV (CVBS)
Adjustment spec) 3) COMPONENT (480i)
4) Check the `ADC' is ok. 4) RGB (PC : 1366 x 768 @ 60 Hz)
5) HDMI (PC : 1366 x 768 @ 60 Hz)
6) PC Audio In
4.2. Model name & Serial number Down- * Display and Sound check is executed by Remote controller
load
4.2.1. Model name & Serial number D/L Caution : Not to push the INSTOP KEY after completion if
1) Press "Power on" key of service remote control. the function inspection.
2) Connect RS232 Signal Cable to RS-232 Jack.
3) Write Serial number by use RS-232. 4.3.2. PIP Check
4) Must check the serial number at the Diagnostics of SET UP 1) Press "Power on" key of service remote control.
menu. (Refer to below). 2) Input RGB & TV(ATV or DTV) signal.
3) Set Input mode to RGB.
4) Press `PIP" key of ADJ remote controller
5) Check TV Video & Audio signal of Sub picture.




4.2.2. Method & notice
1) Serial number D/L is using of scan equipment.
2) Setting of scan equipment operated by Manufacturing
Technology Group.
3) 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

* Manual Download (Model Name and Serial
Number)
If the TV set is downloaded By OTA or Service man, Some-
times model name or serial number is initialized.( Not always)
There is impossible to download by bar code scan, so It need
Manual download.
1) Press the 'Instart' key of ADJ remote controller.
2) Go to the menu 'Model Number D/L' like below photo.
3) Input the Factory model name (ex GP4-LOW) or Serial
number like photo.
4) Check the model name Instart menu Factory name
displayed (ex GP4-LOW)
5) Check the Diagnostics (DTV country only) Buyer model
displayed (ex 24MN33D)




Copyright © LG Electronics. Inc. All right reserved. - 11 - LGE Internal Use Only
Only for training and service purposes
4.4. White balance adjustment 4.5. DPM Operation check
-Equipment Measurement Condition: 100~240V@ 50/60Hz
1) Color Analyzer: CA-210 (LED Module : CH 14) 1) Set Input to RGB-PC and connect D-sub cable to set ­
2) Adj. Computer(During auto adj., RS-232C protocol is RGB Mode. Set Input to HDMI(with Input Label set to PC)
needed) and connect HDMI cable to set ­ HDMI Mode
3) Adjust Remocon 2) Cut off H sync or V sync of signal.
3) Check DPM operation refer to the below table.
RGB_Gains are fixed data for each model. Operating Condition Sync Video LED Wattage
Insert RS-232C Jack which is connected with PC for White (H/V) (SET) (W)
Balance or equivalent device. Power S/W On Sleep mode - Off/Off Off Amber 1
* Total Assembly line should be check whether the color RGB,HDMI
coordinate(x,y) data refer to below table were meet or not.
Color Cool 13,000k °K X=0.276 (±0.03) HDMI2 DPM Operating condition with MHL
Temperature Y=0.275 (±0.03) Inner pattern -Input Label: HDMI (PC&DVI Mode)
(204gray,80IRE) MHL Cable HDMI & HDMI to DVI Cable
Medium 9,300k °K X=0.290 (±0.03)
Y=0.298 (±0.03)
DPM X O
Warm 6,500k °K X=0.318 (±0.03)
Y=0.334 (±0.03)
Luminance Cool Min : 80 Typ : 110 4.6. Model Name & SW Version & Adjust
(cd/m²) Inner pattern
Medium Min : 80 Typ : 110 (204gray,80IRE) check.
Warm Min : 70 Typ : 110 * Press the `Instart' key of ADJ remote controller
4.6.1. Model Name& SW Version Check
*Note : x,y coordinates are drifted about 0.007 after 30 mins 1) Check `Model Name'.
heat-run. So checking color coordinate within 5-min at 2) Check `S/W Version' (Refer to the IC Ver. in the BOM)
total assembly line, consider x,y coordinates might be
up to 0.007 than x,y target of each color temperature. 4.6.2. Adjust Check
1) Check `Country Group'
*Note : Manual W/B process using adjusts Remote control. 2) Check `Area Option'
1) After enter Service Mode by pushing "ADJ" key, 3) Check `Tool Option' (Refer to the BOM Comments)
2) Enter "White Balance" by pushing "" key at "White Bal- 4) Check `Adjust ADC[Comp&RGB]' is OK.
ance". 5) Check `EDID[RGB&HDMI]' is OK.
* After check all, Press the 'EXIT' key of ADJ remote controller
to go out SVC menu.




* When doing Adjustment, Please make circumstance as
below.




4.7. Outgoing condition Configuration
* After all function test., press IN-STOP Key by SVC Remote
controller. And make Outgoing Condition




Copyright © LG Electronics. Inc. All right reserved. - 12 - LGE Internal Use Only
Only for training and service purposes
TROUBLE SHOOTING
1. No Power
N Check Power connector N
Check C851 All Replace Adapter
Voltage Level (19V) OK ?

Y

Check IC802 Output N
Replace IC802
Voltage Level (3.3V_ST)

Y
N Replace IC806 &
Check IC806 output
Voltage Level (5V) Recheck

Y

Check IC801 Output N
Replace IC801
Voltage Level (12V)

Y

Check IC808 Output N
Replace IC808
Voltage Level (2.5V)

Y

Check IC803 Output N
Replace IC803
Voltage Level (1.15V)

Y

Check IC807 Output N
Replace IC807
Voltage Level (1.5V)


Y
Check IC809 Output N
Replace IC809
Voltage Level (1.23V)

Y

Check X201 Clock N
Replace X201
24MHz

Y


Replace IC100 Flash Memory




Copyright © LG Electronics. Inc. All right reserved. - 13 - LGE Internal Use Only
Only for training and service purposes
2. No Picture
N Check WLED_ENABLE high N Check IC101
Module
Back Light On ? R130 or R126 Replace Main Scaler IC

Y Y

Check LED Driver output N Check LED Driver IC1100
(LED Driver B'd P1100 #6) Replace LED Driver IC



Check Panel power N
P601(#27,28,29,30) 12V Replace IC801
IC801 Output 12V

Y
N Check IC101
Check Panel clock
P601(#9,10) Repair Main B/D


Y

Check FFC Cable for damage N
Replace Cable
or open conductors.

Y

Replace T-con
Board or module




Copyright © LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only
Only for training and service purposes
3. No Video - Digital TV
Check RF Cable

Y

N
1. Check Tuner(TU3700 #5) Power (3.3V) Replace IC803
2. Check IC803 Output voltage(3.3V)

Y

N
1. Check Tuner(TU3700 #7) Power (1.8V) Replace IC805
2. Check IC805 Output voltage(1.8V)

Y

N
Check Tuner(TU3700) I2C Signal Check IC101
SCL(R3735), SDA(R3736)

Y

N
Check Tuner(TU3600) Replace Tuner(TU3600)
Data, CLK, SYN, VAL Recheck




Copyright © LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only
Only for training and service purposes
4. No Video - Component

Check input signal format
Is it supported?
Y Wave form of Comp Y Wave form of Comp Pb Wave form of Comp Pr


Check Component Cable

Y

N Replace JK2800 or
Check JK2800 Check Device

Y

Check signal N Replace R239,R237,R241
R239,R237,R241
C220,C218,C222
C220,C218,C222

Y



IC101 has problem




Wave form of C220 Wave form of C218 Wave form of C222




Copyright © LG Electronics. Inc. All right reserved. - 16 - LGE Internal Use Only
Only for training and service purposes
5. No Video - RGB
Check input signal format
Is it supported?

Y


Check RGB Cable

Y
N Replace JK400 or
Check JK400 Check Device
Y


Check Hsync, Vsync N
Replace R266, R267
R266, R267

Y


Check signal RGB N Replace R228,R230,R232
R228,R230,R232 C204,C206,C208
C204,C206,C208
Y



IC101 has problem




Wave form of R4025(Vsync) Wave form of R4024(Hsync)




Wave form of R228/C204 Wave form of R230/C206 Wave form of R232/C208




Copyright © LG Electronics. Inc. All right reserved. - 17 - LGE Internal Use Only
Only for training and service purposes
6. No Video - HDMI
Check input signal format
Is it supported?
Y

Check HDMI Cable for damage
or open connector
Y

Check JK501 N
Replace connector
for proper connection or damage
Y


Check I2C Signal (JK501) N
(#15, #16) Re download EDID data


Y

N
Check HDCP Key (IC101) Replace Scaler(IC101)




Copyright © LG Electronics. Inc. All right reserved. - 18 - LGE Internal Use Only
Only for training and service purposes
7. No Audio
Make sure you can't hear any audio and
Device support the audio signal normally.
Y


Check Speaker and N
its wire connection (P700) Replace connector or Speaker
and the resistance

Y



N
Check R870 Voltage Level (3.3V) Replace IC807(3.3V)


Y



Check Signal from IC700 N
Replace IC700
L700,L701, L706, L709

Y


Check Signal from IC101 N
SDA/SCL Replace IC101
(R703/R214, R707/R213)




Copyright © LG Electronics. Inc. All right reserved. - 19 - LGE Internal Use Only
Only for training and service purposes
BLOCK DIAGRAM




Copyright © LG Electronics. Inc. All right reserved. - 20 - LGE Internal Use Only
Only for training and service purposes
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 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 X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
400




910




900
535




820
LV1




121




120
540
A2




810
200




800
511



302
300




510
301




Copyright © LG Electronics. Inc. All right reserved. - 21 - LGE Internal Use Only
Only for training and service purposes
NON BR(NAND_1G_HYNIX_9103(DEV))
IC102
H27U1G8F2CTR-BC
NAND FLASH MEMORY +3.3V_Normal +3.3V_Normal Boot from SPI CS1N(EXT_FLASH) 1'b0
NC_1 NC_29
Boot from SPI_CS0N(INT_FLASH) 1'b1
1 48 IC101
NC_2 EAN35669103 NC_28 MSD804KKX
2 47
PCM_A[0-7]
NC_3 NC_27
3 46
22 (I2S_OUT_BCK,I2S_OUT_MCK,PAD_PWM1PAD_PWM0) S7LR-M_NON_MS10(KR/US)
NC_4 NC_26 B51_no_EJ : 4'b0000 Boot from 8051 with SPI flash W21
4 45 AR101
22 SB51_WOS : 4'b0001 Secure B51 without scramble AA18
PCMDATA[0]/GPIO129
NC_5 I/O7 PCM_A[7] SB51_WS : 4'b0010 Secure B51 with scramble PCMDATA[1]/GPIO130
R109 5 44
AR103 R107 3.9K MIPS_SPE_NO_EJ : 4'b0100 Boot from MIPS with SPI flash AB22
1K NC_6 I/O6 PCM_A[6] PCMDATA[2]/GPIO131
6 43 MIPS_SPI_EJ_1 : 4'b0101 Boot from MIPS with SPI flash AE20