LG 37LK456C User manual

Printed in KoreaP/NO : MFL67467602 (1202-REV00)
CHASSIS : LD0EC
MODEL : 37LK456C 37LK456C-ZB
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
LCD TV
SERVICE MANUAL
North/Latin America http://aic.lgservice.com
Europe/Africa http://eic.lgservice.com
Asia/Oceania http://biz.lgservice.com
Internal Use Only

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Only for training and service purposes
CONTENTS
CONTENTS .............................................................................................. 2
SAFETY PRECAUTIONS ........................................................................ 3
SERVICING PRECAUTIONS ................................................................... 4
SPECIFICATION ...................................................................................... 6
ADJUSTMENT INSTRUCTION ............................................................... 9
TROUBLE SHOOTING GUIDE ............................................................... 16
BLOCK DIAGRAM ................................................................................. 24
EXPLODED VIEW .................................................................................. 25
SCHEMATIC CIRCUIT DIAGRAM ..............................................................

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Only for training and service purposes
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
An isolation Transformer should always be used during the
servicing of a receiver whose chassis is not isolated from the AC
power line. Use a transformer of adequate power rating as this
protects the technician from accidents resulting in personal injury
from electrical shocks.
It will also protect the receiver and it's components from being
damaged by accidental shorts of the circuitry that may be
inadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this TV receiver is blown,
replace it with the specified.
When replacing a high wattage resistor (Oxide Metal Film Resistor,
over 1 W), keep the resistor 10 mm away from PCB.
Keep wires away from high voltage or high temperature parts.
Before returning the receiver to the customer,
always perform an AC leakage current check on the exposed
metallic parts of the cabinet, such as antennas, terminals, etc., to
be sure the set is safe to operate without damage of electrical
shock.
Leakage Current Cold Check(Antenna Cold Check)
With the instrument AC plug removed from AC source, connect an
electrical jumper across the two AC plug prongs. Place the AC
switch in the on position, connect one lead of ohm-meter to the AC
plug prongs tied together and touch other ohm-meter lead in turn to
each exposed metallic parts such as antenna terminals, phone
jacks, etc.
If the exposed metallic part has a return path to the chassis, the
measured resistance should be between 1 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.
Leakage Current Hot Check (See below Figure)
Plug the AC cord directly into the AC outlet.
Do not use a line Isolation Transformer during this check.
Connect 1.5 K / 10 watt resistor in parallel with a 0.15 uF capacitor
between a known good earth ground (Water Pipe, Conduit, etc.)
and the exposed metallic parts.
Measure the AC voltage across the resistor using AC voltmeter
with 1000 ohms/volt or more sensitivity.
Reverse plug the AC cord into the AC outlet and repeat AC voltage
measurements for each exposed metallic part. Any voltage
measured must not exceed 0.75 volt RMS which is corresponds to
0.5 mA.
In case any measurement is out of the limits specified, there is
possibility of shock hazard and the set must be checked and
repaired before it is returned to the customer.
Leakage Current Hot Check circuit
IMPORTANT SAFETY NOTICE
SAFETY PRECAUTIONS

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Only for training and service purposes
SERVICING PRECAUTIONS
CAUTION: Before servicing receivers covered by this service
manual and its supplements and addenda, read and follow the
SAFETY PRECAUTIONS on page 3 of this publication.
NOTE: If unforeseen circumstances create conict between the
following servicing precautions and any of the safety precautions
on page 3 of this publication, always follow the safety precautions.
Remember: Safety First.
General Servicing Precautions
1. Always unplug the receiver AC power cord from the AC power
source before;
a. Removing or reinstalling any component, circuit board mod-
ule or any other receiver assembly.
b. Disconnecting or reconnecting any receiver electrical plug or
other electrical connection.
c. Connecting a test substitute in parallel with an electrolytic
capacitor in the receiver.
CAUTION: A wrong part substitution or incorrect polarity
installation of electrolytic capacitors may result in an explo-
sion hazard.
2. Test high voltage only by measuring it with an appropriate
high voltage meter or other voltage measuring device (DVM,
FETVOM, etc) equipped with a suitable high voltage probe.
Do not test high voltage by "drawing an arc".
3. Do not spray chemicals on or near this receiver or any of its
assemblies.
4. Unless specied otherwise in this service manual, clean
electrical contacts only by applying the following mixture to the
contacts with a pipe cleaner, cotton-tipped stick or comparable
non-abrasive applicator; 10 % (by volume) Acetone and 90 %
(by volume) isopropyl alcohol (90 % - 99 % strength)
CAUTION: This is a ammable mixture.
Unless specied otherwise in this service manual, lubrication of
contacts in not required.
5. Do not defeat any plug/socket B+ voltage interlocks with which
receivers covered by this service manual might be equipped.
6. Do not apply AC power to this instrument and/or any of its
electrical assemblies unless all solid-state device heat sinks are
correctly installed.
7. Always connect the test receiver ground lead to the receiver
chassis ground before connecting the test receiver positive
lead.
Always remove the test receiver ground lead last.
8. Use with this receiver only the test xtures specied in this
service manual.
CAUTION: Do not connect the test xture ground strap to any
heat sink in this receiver.
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid-state) devices can be damaged eas-
ily by static electricity. Such components commonly are called
Electrostatically Sensitive (ES) Devices. Examples of typical ES
devices are integrated circuits and some eld-effect transistors
and semiconductor “chip” components. The following techniques
should be used to help reduce the incidence of component dam-
age caused by static by static electricity.
1. Immediately before handling any semiconductor component or
semiconductor-equipped assembly, drain off any electrostatic
charge on your body by touching a known earth ground. Alter-
natively, obtain and wear a commercially available discharging
wrist strap device, which should be removed to prevent poten-
tial shock reasons prior to applying power to the unit under test.
2. After removing an electrical assembly equipped with ES
devices, place the assembly on a conductive surface such as
aluminum foil, to prevent electrostatic charge buildup or expo-
sure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ES
devices.
4. Use only an anti-static type solder removal device. Some solder
removal devices not classied as “anti-static” can generate
electrical charges sufcient to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate
electrical charges sufcient to damage ES devices.
6. Do not remove a replacement ES device from its protective
package until immediately before you are ready to install it.
(Most replacement ES devices are packaged with leads electri-
cally shorted together by conductive foam, aluminum foil or
comparable conductive material).
7. Immediately before removing the protective material from the
leads of a replacement ES device, touch the protective material
to the chassis or circuit assembly into which the device will be
installed.
CAUTION: Be sure no power is applied to the chassis or circuit,
and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged replace-
ment ES devices. (Otherwise harmless motion such as the
brushing together of your clothes fabric or the lifting of your
foot from a carpeted oor can generate static electricity suf-
cient to damage an ES device.)
General Soldering Guidelines
1. Use a grounded-tip, low-wattage soldering iron and appropriate
tip size and shape that will maintain tip temperature within the
range or 500 °F to 600 °F.
2. Use an appropriate gauge of RMA resin-core solder composed
of 60 parts tin/40 parts lead.
3. Keep the soldering iron tip clean and well tinned.
4. Thoroughly clean the surfaces to be soldered. Use a mall wire-
bristle (0.5 inch, or 1.25 cm) brush with a metal handle.
Do not use freon-propelled spray-on cleaners.
5. Use the following unsoldering technique
a. Allow the soldering iron tip to reach normal temperature.
(500 °F to 600 °F)
b. Heat the component lead until the solder melts.
c. Quickly draw the melted solder with an anti-static, suction-
type solder removal device or with solder braid.
CAUTION: Work quickly to avoid overheating the circuit
board printed foil.
6. Use the following soldering technique.
a. Allow the soldering iron tip to reach a normal temperature
(500 °F to 600 °F)
b. First, hold the soldering iron tip and solder the strand against
the component lead until the solder melts.
c. Quickly move the soldering iron tip to the junction of the
component lead and the printed circuit foil, and hold it there
only until the solder ows onto and around both the compo-
nent lead and the foil.
CAUTION: Work quickly to avoid overheating the circuit
board printed foil.
d. Closely inspect the solder area and remove any excess or
splashed solder with a small wire-bristle brush.

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

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Only for training and service purposes
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement .
1. Application range
This specification is applied to the LCD TV used LD0EC chassis.
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 (AC 100-240 V~, 50/60 Hz)
* Standard Voltage of each products is marked by models.
(4) Specification and performance of each parts are followed
each drawing and specification by part number in
accordance with BOM.
(5) The receiver must be operated for about 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
4. Model General Specification
No. Item Specication Remarks
1 Market
EU(PAL Market-36Countries) DTV –T/C & Analog
Germany, Netherland, Switzerland, Hungary, Austria,
Slovenia, Sweden, Denmark, Finland, Norway, Bulgaria
DTV-T & Analog
UK, France, Spain, Italy, Belgium, Russia, Luxemburg,
Greece, Czech, Croatia, Turkey, Moroco, Ireland, Latvia,
Estonia, Lithuania, Poland, Portugal, Romania, Ukraine
Analog Only
Kazakhstan, Albania, Bosnia, Serbia, Slovakia
2 Broadcasting system
1) PAL-BG
2) PAL-DK
3) PAL-I/I’
4) SECAM L/L’
5) DVB-T/C/S(ID TV)
3 Receiving system Analog : Upper Heterodyne
Digital : COFDM, QAM Scart 1 Jack is Full scart and support RF-OUT(analog).
4 Scart Jack (1EA) PAL, SECAM
5 Video Input RCA(1EA) PAL, SECAM, NTSC 4 System : PAL, SECAM, NTSC, PAL60
6 Component Input (1EA) Y/Cb/Cr, Y/Pb/Pr
7 RGB Input RGB-PC Analog(D-SUB 15PIN)
8 HDMI Input (3EA)
HDMI1-DTV/DVI
HDMI2-DTV
HDMI3-DTV
PC(HDMI version 1.3)
Support HDCP
Input port is different by model.
9 Audio Input (3EA) RGB/DVI Audio, Component, AV L/R Input
10 SDPIF out (1EA) SPDIF out
11 Earphone out (1EA) Antenna, AV1, AV2, Component, RGB,
HDMI1, HDMI2, HDMI3
12 USB (1EA) For SVC (download)
DVIX
13 DVB
DVB-T
CI : UK, Finland, Denmark, Norway, Sweden, Russia,
Spain, Ireland, Luxemburg, Belgium, Netherland
CI+ : France(Canal+), Italy(DGTVi)
DVB-C
CI : Switzerland, Austria, Slovenia, Hungary, Bulgaria
CI+ : Switzerland(UPC,Cablecom), Netherland(Ziggo),
Germany(KDG,CWB), Finland(labwise)
DVB-S CI+ : Germany(Astra HD+ )

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Only for training and service purposes
5. Component Input (Y, PB, PR)
6. RGB Input (PC)
No. Resolution H-freq(kHz) V-freq(Hz) Proposed
1 720×480 15.73 60.00 SDTV, DVD 480i
2 720×480 15.63 59.94 SDTV, DVD 480i
3 720×480 31.47 59.94 480p
4 720×480 31.50 60.00 480p
5 720×576 15.625 50.00 SDTV, DVD 625 Line
6 720×576 31.25 50.00 HDTV 576p
7 1280×720 45.00 50.00 HDTV 720p
8 1280×720 44.96 59.94 HDTV 720p
9 1280×720 45.00 60.00 HDTV 720p
10 1920×1080 31.25 50.00 HDTV 1080i
11 1920×1080 33.75 60.00 HDTV 1080i
12 1920×1080 33.72 59.94 HDTV 1080i
13 1920×1080 56.250 50 HDTV 1080p
14 1920×1080 67.5 60 HDTV 1080p
No. Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed Remarks
1 720*400 31.468 70.08 28.321 For only DOS mode
2 640*480 31.469 59.94 25.17 VESA Input 848*480 60Hz, 852*480 60Hz
→ 640*480 60Hz Display
3 800*600 37.879 60.31 40.00 VESA
4 1024*768 48.363 60.00 65.00 VESA(XGA)
5 1360*768 47.72 59.8 84.75 WXGA FHD model
6 1280*1024 63.981 60.02 108.875 SXGA FHD Model
7 1920*1080 67.5 60 148.5 WUXGA FHD model

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Only for training and service purposes
7. HDMI Input(PC/DTV)
7.1. DTV mode
7.2. PC mode
No. Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed
1. 720*480 31.469 / 31.5 59.94 / 60 27.00/27.03 SDTV 480P
2. 720*576 31.25 50 54 SDTV 576P
3. 1280*720 37.500 50 74.25 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 26.97 / 27 23.97 / 24 74.17/74.25 HDTV 1080P
8. 1920*1080 33.716/ 33.75 29.976/30.00 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
No. Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed Remarks
1. 720*400 31.468 70.08 28.321 HDCP
2. 640*480 31.469 59.94 25.17 VESA HDCP
3 800*600 37.879 60.31 40.00 VESA HDCP
4. 1024*768 48.363 60.00 65.00 VESA(XGA) HDCP
6. 1360*768 47.72 59.8 84.75 WXGA HDCP
7. 1280*720 45 60 74.25 HDCP
8. 1280*1024 63.981 60.02 108.875 SXGA HDCP / FHD model
9. 1920*1080 67.5 60 148.5 WUXGA HDCP / FHD model

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Only for training and service purposes
ADJUSTMENT INSTRUCTION
1. Application Range
This specification sheet is applied to all of the LCD TV with
LD0EC chassis.
2. Designation
(1) The adjustment is according to the order which is designated
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.
(4) Input signal Unit: Product Specification Standard.
(5) Reserve after operation : Above 5 Minutes (Heat Run)
Temperature : at 25 °C ± 5 °C
Relative humidity : 65 ± 10 %
Input voltage : 220 V, 60 Hz
(6) Adjustment equipments: Color Analyzer(CA-210 or CA-110),
DDC Adjustment Jig, Service remote control.
(7) Push the "IN STOP" key - For memory initialization.
3. Main PCB check process
▪ APC - After Manual-Insert, executing APC
* 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 "Error" is displayed, check connection between computer,
jig, and set.
(3) Click "Read" tab, and then load download file(XXXX.bin)
by clicking "Read"
(4) Click "Connect" tab. If "Can't" is displayed, check connection
between computer, jig, and set.
(5) Click "Auto" tab and set as below.
(6) Click "Run".
(7) After downloading, check "OK" message.
* USB DOWNLOAD
(1) Put the USB Stick to the USB socket.
(2) Automatically detecting update file in USB Stick.
- If your downloaded program version in USB Stick is Low,
it didn't work. But your downloaded version is High, USB
data is automatically detecting.
(3) Show the message "Copying files from memory".
(4) Updating is starting.
(5) Updating Completed, The TV will restart automatically.
(6) If your TV is turned on, check your updated version and
Tool option. (explain the Tool option, next stage)
* If downloading version is more high than your TV have, TV
can lost all channel data. In this case, you have to channel
recover. if all channel data is cleared, you didn’t have a DTV/
ATV test on production line.
* After downloading, have to adjust Tool Option again.
(1) Push "IN-START" key in service remote control.
(2) Select "Tool Option 1" and push "OK" key.
(3) Punch in the number. (Each model has their number)
(1)
filexxx.bin
(4)
(5)
(6)
(7)...........OK
filexxx.bin
(2)
(3)
Please Check the Speed :
To use speed between
from 200KHz to 400KHz
Case1 : Software version up
1. After downloading S/W by USB , TV set will reboot
automatically.
2. Push “In-stop” key.
3. Push “Power on” key.
4. Function inspection
5. After function inspection, Push “In-stop” key.
Case2 : Function check at the assembly line
1. When TV set is entering on the assembly line, Push
“In-stop” key at rst.
2. Push “Power on” key for turning it on.
→ If you push “Power on” key, TV set will recover
channel information by itself.
3. After function inspection, Push “In-stop” key.

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Only for training and service purposes
3.1. ADC Process
(1) ADC
- Enter Service Mode by pushing "ADJ" key,
- Enter Internal ADC mode by pushing "►" key at "7. ADC
Calibration".
<Caution> Using "power on" key of the Adjustment remote
control, power on TV.
* ADC Calibration Protocol (RS232)
Adjust Sequence
▪ aa 00 00 [Enter Adjust Mode]
▪ xb 00 40 [Component1 Input (480i)]
▪ ad 00 10 [Adjust 480i Comp1]
▪ xb 00 60 [RGB Input (1024*768)] (only LD21B)
▪ ad 00 10 [Adjust 1024*768 RGB] (only LD21B)
▪ aa 00 90 End Adjust mode
* Required equipment : Adjustment remote control.
3.2. EDID Download
▪ After enter Service Mode by pushing "ADJ" key.
▪ Enter EDID D/L menu.
▪ Enter "START" by pushing "OK" key.
<Caution> Never connect HDMI && D-sub cable when EDID
downloaded.
3.3. EDID data
(1) FHD RGB EDID data
(2) FHD HDMI EDID data
(3) Detail EDID Options are below
a. Product ID
b. Serial No: Controlled on production line.
c. Month, Year: Controlled on production line:
ex) Week : '01' -> '01'
Year : '2012' -> '16' fix
d. Model Name(Hex):
cf) TV set’s model name in EDID data is below.
e. Checksum: Changeable by total EDID data.
f. Vendor Specific(HDMI)
EZ ADJUST
0. Tool Option1
1. Tool Option2
2. Tool Option3
3. Tool Option4
4. Tool Option 5
5. Country Group
6. Area Option
7. ADC Calibration ඖ
8. White Balance
9. 10 Point WB
10. Test Pattern
11. EDID D/L
12. Sub B/C
13. Touch Sensitivity Setting
ADC Calibration
ADC Comp 480i NG
ADC Comp 1080p NG
ADC RGB NG
Start Reset
NO Item CMD 1 CMD 2 Data 0
Enter
Adjust MODE
Adjust
‘Mode In’ A A 0 0 When transfer the ‘Mode In’, Carry the command.
ADC adjust ADC Adjust A D 1 0 Automatically adjustment
(The use of a internal pattern)
0 1 2 3 4 5 6 7 8 9 A B C D E F
0 00 FF FF FF FF FF FF 00 1E 6D a b
10 c 01 03 68 10 09 78 0A EE 91 A3 54 4C 99 26
20 0F 50 54 A1 08 00 81 80 61 40 45 40 31 40 01 01
30 01 01 01 01 01 01 02 3A 80 18 71 38 2D 40 58 2C
40 45 00 A0 5A 00 00 00 1E 66 21 50 B0 51 00 1B 30
50 40 70 36 00 A0 5A 00 00 00 1E 00 00 00 FD 00 3A
60 3E 1E 53 10 00 0A 20 20 20 20 20 20 d
70 d 00 e
0 1 2 3 4 5 6 7 8 9 A B C D E F
0 00 FF FF FF FF FF FF 00 1E 6D a b
10 c 01 03 80 10 09 78 0A EE 91 A3 54 4C 99 26
20 0F 50 54 A1 08 00 71 4F 81 80 01 01 01 01 01 01
30 01 01 01 01 01 01 02 3A 80 18 71 38 2D 40 58 2C
40 45 00 A0 5A 00 00 00 1E 1B 21 50 A0 51 00 1E 30
50 48 88 35 00 A0 5A 00 00 00 1C 00 00 00 FD 00 3A
60 3E 1E 53 10 00 0A 20 20 20 20 20 20 d
70 d 01 e
80 02 03 26 F1 4E 10 1F 84 13 05 14 03 02 12 20 21
90 22 15 01 26 15 07 50 09 57 07 f
A0 f E3 05 03 01 01 1D 80 18 71 1C 16 20 58 2C
B0 25 00 A0 5A 00 00 00 9E 01 1D 00 72 51 D0 1E 20
C0 6E 28 55 00 A0 5A 00 00 00 1E 02 3A 80 18 71 38
D0 2D 40 58 2C 45 00 A0 5A 00 00 00 1E 01 1D 00 BC
E0 52 D0 1E 20 B8 28 55 40 A0 5A 00 00 00 1E 00 00
F0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 e
EZ ADJUST
0. Tool Option1
1. Tool Option2
2. Tool Option3
3. Tool Option4
4. Tool Option 5
5. Country Group
6. Area Option
7. ADC Calibration
ඖ
8. White Balance
9. 10 Point WB
10. Test Pattern
11. EDID D/L
12. Sub B/C
13. Touch Sensitivity Setting
EDID D/L
HDMI1
HDMI2
NG
HDMI3
NG
RGB
NG
NG
Start Reset
MODEL NAME HEX EDID Table DDC Function
HD/FHD Model 0001 01 00 Analog/Digital
Model name MODEL NAME(HEX)
LG TV 00 00 00 FC 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 (LG TV)
Input Model name(HEX)
HDMI1 67030C001000B82D
HDMI2 67030C002000B82D
HDMI3 67030C003000B82D
EDID C/S data FHD
HDMI RGB
Check sum
(Hex)
Block 0 E2 ED
Block 1
99 (HDMI1)
-89 (HDMI2)
79 (HDMI3)

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Only for training and service purposes
3.4 Function Check
- Check display and sound
■ Check Input and Signal items.
1) TV
2) AV (SCART / CVBS)
3) COMPONENT (480i)
4) RGB (PC : 1024 x 768 @ 60hz)
5) HDMI
6) PC Audio In
* Display and Sound check is executed by Remote control.
<Caution>
Not to push the INSTOP key after completion if the function
inspection.
4. Total Assembly line process
4.1. Adjustment Preparation
▪ W/B Equipment condition
CA210
: CCFL/EEFL -> CH9, Test signal: Inner pattern(80IRE)
LED -> CH14, Test signal: Inner pattern(80IRE)
▪ If it is executed W/B adjustment in 2~3 minutes H/run, it is
adjusted by Target data
* Connecting picture of the measuring instrument
(On Automatic control)
Inside PATTERN is used when W/B is controlled. Connect to
auto controller or push Adjustment R/C POWER ON -> Enter
the mode of White-Balance, the pattern will come out.
* Auto-control interface and directions
(1) Adjust in the place where the influx of light like floodlight
around is blocked. (illumination is less than 10 lux).
(2) Adhere closely the Color analyzer(CA210) to the module
less than 10 cm distance, keep it with the surface of the
Module and Color analyzer's prove vertically.(80° ~ 100°).
(3) Aging time
- After aging start, keep the power on (no suspension of
power supply) and heat-run over 5 minutes.
- Using 'no signal' or 'POWER ONLY' or the others, check
the back light on.
▪ Auto adjustment Map(using RS-232C to USB cable)
RS-232C COMMAND
[CMD ID DATA]
Wb 00 00 White Balance Start
Wb 00 ff White Balance End
<Caution>
Color Temperature : COOL, Medium, Warm.
One of R Gain/G Gain/ B Gain should be kept on 0xC0, and
adjust other two lower than C0.(When R/G/B Gain are all
C0, it is the FULL Dynamic Range of Module)
* Manual W/B process using adjust Remote control.
▪ After enter Service Mode by pushing "ADJ" key,
▪ Enter White Balance by pushing "►" key at "8. White
Balance".
* After you finished all adjustments, Press "In-start" key and
compare Tool option and Area option value with its BOM, if
it is correctly same then unplug the AC cable. If it is not
same, then correct it same with BOM and unplug AC cable.
For correct it to the model's module from factory Jig model.
* Push the "IN STOP" key after completing the function
inspection. And Mechanical Power Switch must be set
“ON”.
Mode Temp Coordinate spec
Cool 13,000 K X=0.269 (±0.002)
Y=0.273 (±0.002) <Test Signal>
Inner pattern
(204gray,
80IRE)
Medium 9,300 K X=0.285 (±0.002)
Y=0.293 (±0.002)
Warm 6,500 K X=0.313 (±0.002)
Y=0.329 (±0.002)
Full White Pattern CA-210
COLOR
ANALYZER
TYPE : CA-210
RS-232C Communication
RS-232C COMMAND
[CMD ID DATA] MIN
CENTER
(DEFAULT) MAX
Cool Mid Warm Cool Mid Warm
R Gain jg Ja jd 00 172 192 192 192
G Gain jh Jb je 00 172 192 192 192
B Gain ji Jc jf 00 192 192 172 192
R Cut 64 64 64 128
G Cut 64 64 64 128
B Cut 64 64 64 128
EZ ADJUST
0. Tool Option1
1. Tool Option2
2. Tool Option3
3. Tool Option4
4. Tool Option5
5. Country Group
6. Area Option
7. ADC Calibration
8. White Balance ►
9. 10 Point WB
10. Test Pattern
11. EDID D/L
12. Sub B/C
13. Touch Sensitivity Setting
White Balance
Color Temp.
R-Gain
G-Gain
B-Gain
R-Cut
G-Cut
B-Cut
Test-Pattern
Backlight
Reset
Cool
172
172
192
64
64
64
ON
100
To Set

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Only for training and service purposes
4.2. EYE-Q function check
(1) Turn on TV.
(2) Press “EYE” key on Adjustment remote control.
(3) Cover the Eye Q sensor at the front of set for 6 seconds.
(4) Check the value of Sensor Data. It must be below 10. If
not so, the Eye Q sensor may have some defect. Change
the Eye Q sensor.
(5) Wait for 6 seconds after withdrawing form the Eye Q
sensor.
(6) Check the value of Backlight. It must rise. If not so, the
Eye Q sensor may have some defect. Change the Eye Q
sensor.
4.3. Outgoing condition Configuration
■ When pressing IN-STOP key by SVC remocon, Red LED
are blinked alternatively. And then automatically turn off.
(Must not AC power OFF during blinking)
5. GND and HI-POT Test
5.1. GND & HI-POT auto-check preparation
- Check the POWER cable and SIGNAL cable insertion condition
5.2. GND & HI-POT auto-check
(1) Pallet moves in the station. (POWER CORD / AV CORD is
tightly inserted)
(2) Connect the AV JACK Tester.
(3) Controller (GWS103-4) on.
(4) GND Test (Auto)
- If Test is failed, Buzzer operates.
- If Test is passed, execute next process (Hi-pot test). (Re-
move A/V CORD from A/V JACK BOX)
(5) HI-POT test (Auto)
- If Test is failed, Buzzer operates.
- If Test is passed, GOOD Lamp on and move to next proc-
ess automatically.
5.3. Checkpoint
(1) Test voltage
- GND: 1.5 KV / min at 100 mA
- SIGNAL: 3 KV / min at 100 mA
(2) TEST time: 1 second
(3) TEST POINT
- GND Test = POWER CORD GND and SIGNAL CABLE GND
- Hi-pot Test = POWER CORD GND and LIVE & NEUTRAL.
(4) LEAKAGE CURRENT: At 0.5 mArms
6. Model name & Serial number D/L
▪ Press "Power on" key of service remote control.
(Baud rate : 115200 bps)
▪ Connect RS232 Signal Cable to RS-232 Jack.
▪ Write Serial number by use RS-232.
▪ Must check the serial number at the Diagnostics of SET UP
menu. (Refer to below).
6.1. Signal Table
CMD : A0h
LENGTH : 85~94h (1~16 bytes)
ADH : EEPROM Sub Address high (00~1F)
ADL : EEPROM Sub Address low (00~FF)
Data : Write data
CS : CMD + LENGTH + ADH + ADL + Data_1 +...+ Data_n
Delay : 20ms
6.2. Comand Set
* Description
FOS Default write : <7mode data> write
Vtotal, V_Frequency, Sync_Polarity, Htotal, Hstart, Vstart, 0,
Phase
Data write : Model Name and Serial Number write in EEPROM,.
6.3. 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.
CMD LENGTH ADH ADL DATA_1 . . . Data_n CS DELAY
Adjust mode CMD(hex) LENGTH(hex) Description
EEPROM WRITE A0h 84h+n n-bytes Write (n = 1~16)

- 13 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
* Manual Download(Model Name and Serial Number)
If the TV set is downloaded by OTA or Service man, sometimes
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 Adjustment remote control.
2) Go to the menu "6.Model Number D/L" like below photo.
3) Input the Factory model name or Serial number like photo.
4) Check the model name Instart menu. → Factory name displayed.
(ex 32LV3400-ZG)
5) Check the Diagnostics.(DTV country only) → Buyer model
displayed.(ex 32LV3400-ZG)
7. CI+ key download
7.1 Download Procedure
(1) Press "Power on" key of a service remote control
(Baud rate : 115200 bps)
(2) Connect RS232-C Signal Cable.
(3) Write CI+ Key through RS-232-C.
(4) Check whether the key was downloaded or not at ‘In Start’
menu. (Refer to below).
7.1.1. Check the method of CI+ Key value
(1) Check the method on Instart menu
(2) Check the method of RS232C Command
1) Into the main ass’y mode(RS232: aa 00 00)
2) Check the key download for transmitted command
(RS232: ci 00 10)
3) Result value
- Normally status for download : OKx
- Abnormally status for download : NGx
7.1.2. Check the method of CI+ key value(RS232)
1) Into the main ass’y mode(RS232: aa 00 00)
2) Check the mothed of CI+ key by command
(RS232: ci 00 20)
3) Result value
i 01 OK 1d1852d21c1ed5dcx
CMD 1 CMD 2 Data 0
A A 0 0
CMD 1 CMD 2 Data 0
C I 1 0
CMD 1 CMD 2 Data 0
A A 0 0
CMD 1 CMD 2 Data 0
C I 2 0
CI+ Key Value

- 14 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
8. Commercial Feature inspection
8.1 LG Logo inspection
(1) Turn on TV.
(2) Check LG Logo operation when TV is turning on. (Check
LG Logo is displayed well or not.)
8.2 Welcome Screen Function check
(1) Press “IN STOP” key.
(2) Turn on TV.
(3) Insert USB.
(4) Press “MENU” key.
(5) Move cursor to OPTION and press “7” key 7 times.
(6) Move cursor to “LOGO Image Download” key and select it.
(7) Select image file.(Welcome Screen Test Image_720x576.jpg)
(8) Check displayed image status(color, size) when TV is
turning on.
* Must Restore to LG Logo.
(9) Press “MENU” key.
(10) Move cursor to OPTION and press “7” key 7 times.
(11) Select accurate CPU S/W file and check “LOGO Image”
button. (Press yellow color key on Remote Control.)
(12)Check LG Logo operation when TV is turning on.
8.3. USB Cloning Function check

- 15 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
If the clock LED of TV 2 is on and TV 1, 2 had a same TV
channels → USB cloning is success!!
● CASE 2. No Clock LED Model If the auto volume of TV 2 is on and TV 1, 2 had a same TV
channels → USB cloning is success!!
8.4. After finishing 10.1 ~ 10.3 inspections,
press “IN STOP” key.

- 16 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
TROUBLE SHOOTING
Check stand-by Voltage.
P403 9~12pin : +3.5V_ST Check Power connector. Main B/D 3.5V Line
Short Check
Check X201 clock.
24 MHz Replace X201.
Check P403 PWR_ON.
1pin : 3.3V Replace Mstar(IC101) or Main board.
Check Multi Voltage.
P403 2pin:24V, 17pin:12V
Replace Power Board.
Check Inverter Control & Error Out.
P403 18 pin : High
P403 24 pin : low
Check Power Board or Module.
Check IC402/3/7 Output Voltage.
IC402 : 2.5V
IC403 : 1.1V
IC407 : 1.5V
Q403 : 3.3V
Replace IC402/3/7, Q403.
Re-download software.
Check Micom Voltage.
L404 : +3.5V Replace L404.
Check LVDS Power Voltage.
Q409 : 12 V Replace Q409.
Check Mstar LVDS Output Replace Mstar(IC101) or Main Board.
Change Module.
ok
ok
ok
ok
ok
ok
ok
ok
okNo
No
No
No
No
No
No
No
No
No
ok
Replace Power board.
ok
1. Power-up boot check

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Only for training and service purposes
Check RF Cable & Signal
Check Tuner 3.3V Power
L3703 Replace L3703.
Check Tuner 1.8V Power
IC3703 2 pin : 1.8V
Check IF_P/N Signal
TU3700 10/11 Pin
Replace IC3703.
Check Mstar LVDS Output. Replace Mstar(IC101) o r Main Board.
ok
ok
ok
ok
No
No
No
No
Bad Tuner. Replace T uner.
Check RF Cable & Signal.
Check Tuner 3.3V Power.
L3703 Replace L3703.
Check Tuner 1.8V Power.
IC3703 2 pin : 1.8V
Check CVBS Signal.
TU3700 8 Pin
Replace IC3703.
Check Mstar LVDS Output. Replace Mstar(IC101) or Main Board.
ok
ok
ok
ok
No
No
No
No
Bad Tuner. Replace Tuner.
2. Digital TV Video
3. Analog TV Video

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Only for training and service purposes
Check input signal format.
Is it supported?
Check AV Cable for damage
for damage or open conductor.
Check JK1604
CVBS Signal Line
R246.
ok
ok
ok
No
Replace Jack.
ok
Check CVBS_DET Signal. Replace R1666.
No
Check Mstar LVDS Output. Replace Mstar(IC101) or Main Board.
No
4. AV Video
Check input signal format.
Is it supported?
Check Component Cable
for damage or open conductor.
Check JK1601 or 1603
Y/PB/ PR signal Line.
ok
ok
ok
No
Replace Jack.
Check COMP_DET Signal. Replace R1615.
No
Check Mstar LVDS Output. Replace Mstar(IC101) o r Main Board.
ok
No
5. Component Video

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Only for training and service purposes
Check input signal format.
Is it supported?
Check Component Cable
for damage or open conductor.
Check JK1602
R/G/B and sync signal Line.
ok
ok
ok
No
Replace Jack.
Check SC1_DET Signal. Replace R1614.
No
Check Mstar LVDS Output. Replace Mstar(IC101) or Main Board .
ok
No
Check input signal format.
Is it supported?
Check RGB Cable conductors
for damage or open conductor.
Check EDID
I2C Signal
R138, R139(SDA,SCL).
Check JK1104
H/V_Sync/R/G/B Signal Line.
ok
ok
ok
No
No
Re-download EDID data ,Replace Mstar(IC101) or Main Board.
ok
Replace Jack.
Check DSUB_DET. Replac e R1146 or R1147.
No
Check Mstar LVDS Output. Replace Mstar(IC101) or Main board.
ok
No
6. SCART Video
7. RGB Video

- 20 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Check input signal format.
Is it supported?
Check HDMI Cable conductors
for damage or open conductor.
Check EDID
R4033,R4034,R4035,R4036,
R4037,R4038 I2C Signal.
Check JK801, JK802, JK803.
ok
ok
ok
No
No
Replace the defective IC or re-download EDID data.
Check HDCP EEPROM(IC103)
Power & I2C Signal Replace the defective IC.
ok
No
Replace Jack.
Check HDMI Signal. Check other set.
If no problem, check signal line.
ok
No
Check Mstar LVDS Output. Replace Mstar(IC101) o r Main Board.
ok
No
Replace Main Board.
No
Check HDMI_DET(HPD).
No
ok
Replac e R830,R828,R862.
8. HDMI Video