LG 37LT75 User manual

LCD TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : LD74A
MODEL : 37LT75 37LT75-ZA
website:http://biz.LGservice.com
Internal Use Only

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Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
CONTENTS
CONTENTS .............................................................................................. 2
SAFETY PRECAUTIONS ..........................................................................3
SPECIFICATION ........................................................................................6
ADJUSTMENT INSTRUCTION................................................................11
TROUBLE SHOOTING ............................................................................15
BLOCK DIAGRAM...................................................................................26
EXPLODED VIEW .................................................................................. 34
EXPLODED VIEW PARTS LIST..............................................................35
REPLACEMENT PARTS LIST ............................................................... 36
SVC. SHEET ...............................................................................................

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Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
SAFETY PRECAUTIONS
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the
Schematic Diagram and Replacement Parts List.
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 1W), keep the resistor 10mm 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 1MΩand 5.2MΩ.
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 1.5K/10watt resistor in parallel with a 0.15uF 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
0.5mA.
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
1.5 Kohm/10W
To Instrument's
exposed 
METALLIC PARTS
Good Earth Ground
such as WATER PIPE,
CONDUIT etc.
AC Volt-meter
IMPORTANT SAFETY NOTICE
0.15uF

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Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
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 conflict 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
module or any other receiver assembly.
b. Disconnecting or reconnecting any receiver electrical plug or
other electrical connection.
c. Connecting a test substitute in parallel with an electrolytic
capacitor in the receiver.
CAUTION: A wrong part substitution or incorrect polarity
installation of electrolytic capacitors may result in an
explosion 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 specified 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 flammable mixture.
Unless specified 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 fixtures specified in this
service manual.
CAUTION: Do not connect the test fixture ground strap to any
heat sink in this receiver.
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid-state) devices can be damaged easily
by static electricity. Such components commonly are called
Electrostatically Sensitive (ES) Devices. Examples of typical ES
devices are integrated circuits and some field-effect transistors and
semiconductor "chip" components. The following techniques
should be used to help reduce the incidence of component
damage 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.
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
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
exposure 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 classified as "anti-static" can generate
electrical charges sufficient to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate
electrical charges sufficient 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
electrically 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
replacement ES devices. (Otherwise harmless motion such as
the brushing together of your clothes fabric or the lifting of your
foot from a carpeted floor can generate static electricity
sufficient 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 1.25cm) 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 flows onto and around both the
component 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.
SERVICING PRECAUTIONS

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Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
IC Remove/Replacement
Some chassis circuit boards have slotted holes (oblong) through
which the IC leads are inserted and then bent flat against the
circuit 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
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.
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
connections).
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
connected 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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Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement .
4. General Specification
No. Item Specification Remark
1. Display Screen Device 32/37/42" wide Color Display Module
2. Aspect Ratio 16:9
3. LCD Module 32/37/42" TFT WXGA LCD Maker : LPL
4. Operating Environment Temp. : 0 ~ 40 deg
Humidity : 0 ~ 85 %
5. Storage Environment Temp. : -20 ~ 60 deg
Humidity : 0 ~ 85%
6. Input Voltage AC100 ~ 240V, 50/60Hz
7. Power Consumption Power on (Green)
(42")Total 168.36W (Typ.) (Logic=6.36W, Backlight=162W )
(37") Total 126Watt (Typ.) (Logic=6W, Backlight =120W )
(32")Total 114.32W (Typ.) (Logic=4.32(4.1)W, Backlight =110W )
St-By (Red) : 1.0 W
8. Type Size 760.0 x 450.0 x 48.0 32"
877.0 x 516.8 x 55.5 37"
1006 x 610 x 56 42"
9. Pixel Pitch 0.17025 x 0.51075 32"
0.200 x 0.600 37"
0.227 x 0.681 42"
10. Back Light 18 EEFL 32"
20 EEFL 37"
20 CCFL 42"
11. Display Colors 16.7M (16,777,216)
12. Coating 3H, AG
1. Application range
This spec sheet is applied to the 42"/37" LCD TV used LD74A
chassis
2. Specification
Each part is tested as below without special appointment.
(1) Temperature : 25 ± 5°C(77 ± 9°F), CST : 40 ± 5°C
(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.
3. Test method
(1) Performance : LGE TV test method followed
(2) Demanded other specification
Safety : CE, IEC Specification
EMC : CE, IEC

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Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
5. LCD Module
No Item Min Typ Max Unit Maker
1Luminance 400 500 cd/m250cm from the surface
(W/O PC mode) -Full White Pattern
2
View angle (R/L, U/D) 178/178 degree 32", 37" 42"
3Color Coordinate White X Typ. 0.279/0.279/0.279 Typ.
Y-0.03 0.292/0.292/0.292 +0.03
Red X 0.635/0.636/0.635
Y0.339/0.343/0.344
Green X 0.282/0.284/0.286
Y0.606/0.615/0.614
Blue X 0.145/0.144/0.146
Y0.064/0.063/0.061
Contrast ratio 600 800 32"
(W/O PC mode) 700 900 37"
800 1000 42"
5Luminance Variation 1.3
6. Component Video Input (Y, PB, PR)
No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) 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*576 15.625 50.00 SDTV, DVD 625 Line
5. 720*576 31.25 50.00 HDTV 576p
6. 1280*720 45.00 50.00 HDTV 720p
7. 1280*720 44.96 59.94 HDTV 720p
8. 1920*1080 31.25 50.00 HDTV 1080i
9. 1920*1080 33.75 60.00 HDTV 1080i
10. 1920*1080 33.72 59.94 HDTV 1080i

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Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
7. RGB Input ( PC )
7-1. EDID Data (RGB-PC)
No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed Remarks
1. 720*400 31.468 70.08 28.321
2. 640*480 31.469 59.94 25.17 VESA Input 848*480 60Hz, 852*480 60Hz
37.684 75.00 31.50 => 640*480 60Hz Display
3. 800*600 37.879 60.31 40.00 VESA
46.875 75.00 49.50
4. 832*624 49.725 74.55 57.283 Macintosh
5. 1024*768 48.363 60.00 65.00 VESA(XGA)
56.470 70.00 75.00
60.123 75.029 78.75
6. 1280*768 47.78 59.87 79.5 WXGA
7. 1360*768 47.72 59.8 84.75 WXGA
8. 1366*768 47.56 59.6 84.75 WXGA
9. 1280*1024 63.595 60.0 108.875 SXGA FHD Model only
10. 1400*1050 65.160 60.0 122.50 SXGA FHD Model only
11. 1600*1200 74.077 60.0 130.375 UXGA Reduced Blanking Timing, FHD Model only
Input 1920*1200 60Hz Ë 1600*1200 60Hz Display
12. 1920*1080 66.647 59.988 138.625 WUXGA Reduced Blanking Timing

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Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
8. HDMI input - DTV mode
No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed Remarks
1. 720*480 31.47 59.94 27.00 SDTV 480P(4:3) PC mode => 640*480 60Hz Display
2. 720*480 31.50 60 27.027 SDTV 480P(4:3)
3. 640*480 31.469 59.94 25.175 SDTV 480P(4:3)
4. 640*480 31.469 60.00 25.20 SDTV 480P(4:3)
5. 720*480 31.47 59.94 27.000 SDTV 480P(16:9)
6. 720*480 31.50 60.00 27.027 SDTV 480P(16:9)
7. 720*576 31.25 50.00 27.000 SDTV 576P
8. 1280*720 37.50 50.00 74.176 HDTV 720P
9. 1280*720 44.96 59.94 74.176 HDTV 720P PC mode Ë 1280*720 60Hz Display
10. 1280*720 45.00 60.00 74.250 HDTV 720P
11 1920*1080 33.72 59.94 74.176 HDTV 1080I
12 1920*1080 33.75 60.00 74.250 HDTV 1080I
13 1920*1080 28.125 50.00 74.250 HDTV 1080I 50Hz
14 1920*1080 27.000 24.00 74.250 HDTV 1080P 24Hz
15 1920*1080 56.250 50 148.500 HDTV 1080P 50Hz
16 1920*1080 67.433 59.94 148.352 HDTV 1080P PC mode Ë1920*1080 60Hz Display
17 1920*1080 67.500 60 148.500 HDTV 1080P
8-1. HDMI input - PC mode
No Resolution H-freq(kHz) V-freq.(Hz)
Pixel clock(MHz) Proposed Remarks
1. 720*400 31.468 70.08 28.321
2. 640*480 31.469 59.94 25.17 VESA DTV mode => 480p Display
37.684 75.00 31.50 848*480 60Hz, 852*480 60Hz => No signal
3800*600 37.879 60.31 40.00 VESA
46.875 75.00 49.50
4. 832*624 49.725 74.55 57.283 Macintosh
51024*768 48.363 60.00 65.00 VESA(XGA)
56.470 70.00 75.00
60.123 75.029 78.75
61280*768 47.78 59.87 79.5 WXGA PC mode only
71360*768 47.72 59.8 84.75 WXGA
81366*768 47.56 59.6 84.75 WXGA
91280*1024 63.595 60.0 108.875 SXGA FHD Model only
10 1400*1050 65.160 60.0 122.50 SXGA FHD Model only
11 1600*1200 74.077 60.0 130.375 UXGA Reduced Blanking Timing, FHD Model only
Input 1920*1200 60Hz => No Signal
12 1920*1080 66.647 59.988 138.625 WUXGA Reduced Blanking Timing
DTV mode => 1080P Display

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Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
8-2. HDMI EDID Data
[HDMI1]
[HDMI2]

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Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
ADJUSTMENT INSTRUCTION
1. Application Range
This spec. sheet is applied to all of the LD74A chassis
manufactured at LG TV Plant all over the world
2. Specification
2.1 Because this is not a hot chassis, it is not necessary to use
an isolation transformer.However, the use of isolation
transformer will help to protect test instruments
2.2 Adjustment must be done in the correct sequence.
2.3 The adjustment must be performed at 25±5ºC temperature
and 65±10% relative humidity if there is no specified
designation.
2.4 The input voltage of the receiver must be kept between
100~220V, 50/60Hz.
2.5 Before adjustment, execute Heat-Run for 30 minutes at RF
no signal.
3. Channel Memory
1) Press ADJ key in Adjust remocon.
2) Select "Channel Recover" by using /(CH+/-) key,
and press (VOL+).
3) The set is turned off automatically
4) Press ‘power’ key of Adjust Remocon.
4. EDID
Caution
* Use the proper signal cable for EDID Download
- Analog EDID : Pin3 exists
- Digital EDID : Pin3 exists
* Caution: - Never connect HDMI & D-sub Cable at
the same time.
- Use the proper cables below for EDID
Writing.
- Download HDMI1, HDMI2 separately
because HDMI1 is different from
HDMI2.
4.1. EDID Data
4.2. Data (Refer to Product specification)
1> ANALOG (128Bytes)
2> HDMI 1(256Bytes)
3> HDMI 2(256Bytes)
Item Condition Hex(16) Data
Manufacturer ID GSM 1E6D
Version Digital : 1 01
Revision Digital : 3 03
00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
00 00 FF FF FF FF FF FF 00 1E 6D
10 01 03 01 46 27 78 EA D9 B0 A3 57 49 9C 25
20 11 49 4B A5 6E 00 31 40 45 40 61 40 D1 C0 01 01
30 01 01 01 01 01 01 1B 21 50 A0 51 00 1E 30 48 88
40 35 00 BC 86 21 00 00 1C 26 36 80 A0 70 38 1F 40
50 50 20 85 04 BC 86 21 00 00 18
60 00 00 00 FD
70 00 3C 4B 1D 43 0E 00 0A 20 20 20 20 20 20 00
00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
00 00 FF FF FF FF FF FF 00 1E 6D
10 01 03 80 46 27 78 EA D9 B0 A3 57 49 9C 25
20 11 49 4B A5 6E 00 31 40 45 40 61 40 D1 C0 01 01
30 01 01 01 01 01 01 02 3A 80 18 71 38 2D 40 58 2C
40 45 00 C4 8E 21 00 00 1E 1B 21 50 A0 51 00 1E 30
50 48 88 35 00 BC 86 21 00 00 1C
60 00 00 00 FD
70 00 32 4B 1C 43 0F 00 0A 20 20 20 20 20 20 01
00 02 03 21 F1 4E 02 11 01 03 12 13 04 14 05 21 1F
10 20 22 10 23 09 07 07 83 01 00 00 65 03 0C 00 10
20 00 01 1D 00 BC 52 D0 1E 20 B8 28 55 40 C4 8E 21
30 00 00 1E 01 1D 00 72 51 D0 1E 20 6E 28 55 00 C4
40 8E 21 00 00 1E 01 1D 80 D0 72 1C 16 20 10 2C 25
50 80 C4 8E 21 00 00 9E 8C 0A D0 90 20 40 31 20 0C
60 40 55 00 C4 8E 21 00 00 18 4E 1F 00 80 51 00 1E
70 30 40 80 37 00 BC 88 21 00 00 18 00 00 00 00
00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
00 00 FF FF FF FF FF FF 00 1E 6D ®Õ ®Œ
10 01 03 80 46 27 78 EA D9 B0 A3 57 49 9C 25
20 11 49 4B A5 6E 00 31 40 45 40 61 40 D1 C0 01 01
30 01 01 01 01 01 01 02 3A 80 18 71 38 2D 40 58 2C
40 45 00 C4 8E 21 00 00 1E 1B 21 50 A0 51 00 1E 30
50 48 88 35 00 BC 86 21 00 00 1C
60 00 00 00 FD
70 00 32 4B 1C 43 0F 00 0A 20 20 20 20 20 20 01
00 02 03 21 F1 4E 02 11 01 03 12 13 04 14 05 21 1F
10 20 22 10 23 09 07 07 83 01 00 00 65 03 0C 00 20
20 00 01 1D 00 BC 52 D0 1E 20 B8 28 55 40 C4 8E 21
30 00 00 1E 01 1D 00 72 51 D0 1E 20 6E 28 55 00 C4
40 8E 21 00 00 1E 01 1D 80 D0 72 1C 16 20 10 2C 25
50 80 C4 8E 21 00 00 9E 8C 0A D0 90 20 40 31 20 0C
60 40 55 00 C4 8E 21 00 00 18 4E 1F 00 80 51 00 1E
70 30 40 80 37 00 BC 88 21 00 00 18 00 00 00 00
a
a
d
d
d
e-2
e-2
f-1
f-2
d
c
c
c
d
b
b
a b
d
e-1

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Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Before AV ADC Calibration, should be
executed the "Tool option 1"
5. Select method of Tool option 1
5.1 Press ADJ Key in the Adjust remocon
5.2 Select "Tool option 1" by using /(CH+/-) key, and press
(ENTER).
5.3 Select "Maker" by using /(CH+/-) key, and change the
module maker and. applied module classification by using /
(VOL+/-).
5.4 Select "Inch" by using /(CH+/-) key, and change the
module according to the inch of model .
5.5 Select "Tool" by using /(CH+/-) key, and change the tool
name according to the model .
6. ADC Calibration
=> Caution : - System control RS-232 Host should be "PC" for
adjustment.
- Before AV ADC Calibration, execute the "Module
selection"
6.1 Adjustment of RF / AV / S-VIDEO
√Required Equipments
• Remote controller for adjustment.
• MSPG-925FS Pattern Generator (Which has Video Signal:
7 Color Bar Pattern shown in Fig. 1).
=> Model: 202 / Pattern: 65
6.1.1 Method of Auto RF/AV/S-VIDEO Color Balance (PAL_BGDHI).
1) Input the Video Signal: 7 Color Bar signal into AV3.
2) Set the PSM to Dynamic mode in the Picture menu.
[Fig.1 Color Bar Signal]
3) Press IN-START key on R/C for adjustment.
[Fig.2 Color Bar Signal]
4) Press the (Vol.+) key to operate the set, then it becomes
automatically.
5) Auto-RGB OK means the adjustment is completed.
6.2. Adjustment of Component
√Required Equipments
• Remote controller for adjustment.
• MSPG-925FS Pattern Generator. (Which has 720p/50Hz
YPbPr output Pattern shown in Fig. 2)
-> Model : 215 / Pattern : 65
6.2.1 Method of Auto Component Color Balance
1) Input the Component 720p/50Hz 7 Color Bar (MSPG-
925FS model:215, pattern:65) signal into Component.
2) Set the PSM to Dynamic mode in the Picture menu.
[Fig.3 Color Bar Signal]
3) Press the IN-START key on R/C for adjustment.
4) Press the (Vol.+) key to operate the set , then it
becomes automatically.
[Fig.4 Color Bar Signal]
5) Auto-RGB OK means the adjustment is completed.
ADC AV Component RGB-PC
MSPG925FS PALJ Model:215 (720P)
INPUT SELECT AV3 Pattern:65 Model: 60
Model:202(PAL-BGDHI) *720P/50Hz
(1024*768 60Hz)
7 Color Bar Pattern: 65
Pattern: 65
*PAL 7 Color Bar

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Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
6.3 Adjustment of RGB
√Required Equipments
• Remote controller for adjustment
• MSPG-925FS Pattern Generator (Which has XGA
[1024x768] 60Hz 8 color bar 100% pattern shown in Fig. 3 ).
6.3.1 Method of Auto RGB Color Balance
1) Input the PC 1024x768 @ 60Hz 7 Color Bar (MSPG-
925FS model:3, pattern:65) signal into RGB. (using D-sub
to D-sub cable)
2) Set the PSM to Dynamic mode in Picture menu.
3) Press the IN-START key on R/C for adjustment.
[Fig.5 Color Bar Signal]
4) Press the (Vol.+) key operate To set , then it becomes
automatically.
[Fig.6 Color Bar Signal]
5) Auto-RGB OK means adjustment is completed.
Before adjusting White-balance , the AV ADC
should be done.
7. White Balance
√Test Equipment
• Color Analyzer (CA-210/CH.9)
=> When you adjust LCD color temperature, on Color
analyzer (CA-210), you should use Channel 9 which is
Matrix compensated (White, Red, Green, Blue revised)
by CS-1000 and adjust in accordance with White
balance adjustment coordinate which is specified on
the next..
*Color temperature standards according to CSM and Module
* White balance adjustment coordinate and color temperature.
•
PC (for communication through RS-232C) => UART Baud
rate : 115200 bps
• Luminance Y AV : upper 200 cd/m
2
(Typ : 350 cd/m
2
) =>
Applying to Cool mode
* Connecting picture of the measuring instrument (On Automatic
control)
Inside PATTERN is used when W/B is controlled. Connect to
auto controller or push control R/C IN-START => Enter the
mode of White-Balance, the pattern will come out.
• Measurement color analyzer : CS1000 or CA210(CH.9)
[Fig.7Connecting Picture (on Automatic Control) ]
* Auto-control interface and directions
1) Adjust in the place where the influx of light like floodlight
around is blocked. (illumination is less than 10ux).
2) In case of PDP: Measure and adjust after sticking the
Color Analyzer (CA-100+, CA210 ) to the side of the
module.
In case of LCD: Adhere closely the Color Analyzer (
CA210 ) to the module less than 10cm 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 15 minutes.
- In case of PDP, keep white pattern using inside pattern.
- In case of LCD, using ‘no signal’ or ‘full white pattern’ or
the others, check the back light on.
CSM LCD
Cool 11,000k
Medium 9,300k
Warm 6,500k
Cool CS-1000 CA-210(CH 9)
x0.276 0.276±0.002
y0.283 0.283±0.002
uv 0.000 0.000
Medium CS-1000 CA-210(CH 9)
x0.285 0.285±0.002
y0.293 0.293±0.002
uv 0.000 0.000
Warm CS-1000 CA-210(CH 9)
x0.313 0.313±0.002
y0.329 0.329±0.002
uv 0.004 0.004

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Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
7.1 Manual white Balance
* One of R Gain / G Gain / B Gain should be kept on 80,
and others are controlled lowering from 80
1) Press "power on" of the control R/C, set heat run to white
by pressing , and heat run over 15 minutes
(Set : RS-233 Host : PC, Baud Rate : 115200bps,
Download: Cortez).
2) Zero Calibrate CA-100+, and when controlling, stick the
sensor to the center of LCD module surface.
3) Double click In-start key on Controlling R/C and get in
‘white balance’.
4) Set test-pattern on and display inside pattern. Control is
carried out on three color temperature, COOL, MEDIUM,
WARM. (Control is carried out three times,)
5) When the R/G/B GAIN is 80 on OSD, it is the FULL
DYNAMIC Range of the Module. In order to control white
balance without the saturation of FULL DYNAMIC Range
and DATA, one of R Gain / G Gain / B Gain should be
kept on 80, and other two is controlled lowering from 80.
* Color Temperature: Cool, Medium, Warm
1. When R GAIN is set to 80
- Control G GAIN and B GAIN by lowering from 80.
2. When B GAIN is set to 80
- Control R GAIN and G GAIN by lowering from 80.
3. When G GAIN is set to 80
- Control R GAIN and B GAIN by lowering from
192.
One of R Gain / G Gain / B Gain should be kept on
80, and adjust other two lower than 80.
(When R/G/B GAIN are all 80, it is the FULL
DYNAMIC Range of Module)
8. Scart RGB(DVR) Adjustment Mode
√Required Equipments
• Remote controller for adjustment
• MSPG-925FS Pattern Generator (Which has Video Signal:
Color Bar Pattern shown in Fig. 8).
=> Model: 232 / Pattern: 08
1) Input the Video Signal: Color Bar signal into AV1 (using
Full Scart Cable)
(MSPG-925FS, Model:232, Pattern:8)
2) Set the PSM to Dynamic mode in Picture menu.
3) Press the IN-START key on R/C for adjustment.
4) Press ths TURBO-PICTURE Key on R/C for adjustment
[Fig. 8 Color Bar Signal]
[ Fig. 9 Auto Color Balance]
5) Press the (Vol.+) key operate To set , then it becomes
automatically. [Fig. 9]
6) Scart RGB(DVR) OK means Scart RGB adjustment is
completed.
9. Set Information(Serial No & Model
name)
1) Setting up like bottom figure(After setting white balance,
this is set)
(Setting: Press ADJ Key in the Adjust remocon.
Select "System Control 2" by using /(CH+/-) key,
and press (ENTER)
Using Adjust remocon, RS-232 Host & Baud Rate &
Download value change
2) Bar-code scanning
1> Push the menu button in DTV mode.
Select the STATION => Diagnostics => To set
2> Check the Serial Number.

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Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
TROUBLESHOOTING
1. No power
(1) Symptom
1) Doesn't minute discharge at module.
2) Non does not come in into the front LED.
(2) Check follow
Plug in power cord
No
Yes
Is plug in power cord?
Connect cable.
No
Is connect the Line
Filter and Power
Board Cable?
Replace fuse.
No
Is normal the
Fuse(F100) on Power
Board?
Connect Cable.
After remove the cable connect to
Power Board (except the SC100
connection cable), authorizes the
AC voltage marking on manual.
When ST-BY 5V does not operate,
replace Power Board.
No
Is connect the Power
Board and 13P of VSC
Board Cable?
Yes
Yes
Yes

- 16 -
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
2. Protect mode
(1) Symptom
1) After once shining, it does not discharge minutely from module.
2) The relay falls.(The sound is audible “Click”.)
3) It is converted with the color where the front LED is red from green.
(2) Check follow
Is normal the Power
Board?
Replace Power Board.
Is output the normality Low/High
voltage except Stand-by 5V?
Yes
No No
Is normal the each
connector? Replace connector.
After connecting well each connector,
the normality it operates?
Yes
No No
Is normal the VSC
Board?
After remove P900, P901
normal operation:
Replace VSC Board
Is normal the output voltage after
remove P900, P901 of VSC Board?
No Yes

- 17 -
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. No Raster
(1) Symptom
1) No OSD and image occur at screen.
2) It maintains the condition where the front LED is green
(2) Check follow
Does minute
discharge
At Module?
Is The voltage
(P900 5pin on VSC)
0V or Low?
Is output the normality
Low/High voltage except
stand-by 5V?
Is the inverter on?
Check the LCD
Module
Replace VSC board.
Is It ok?
Yes
No
Yes Yes
Replace the
Power board.
Yes
No
No
Is the LVDS
cable normal?
Reconnect the LVDS
cable in P1901.
Yes
No
Is the IC700 (FLI8548)
Output normal?
Replace the VSC
No

- 18 -
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. In case of occur strange screen into specific mode
1) In case of does't display the OSD
(1) Symptom
1) LED is green.
2) The minute discharge continuously becomes accomplished from module
(2) Check follow
Is normal the LVDS
cable?
Replace Power Board.
Is the LVDS cable connected well?
Cable inserts well.
Yes
No
No
Replace FIL8548 IC(IC700).
No
Yes
Is normal the VSC
Board? Replace VSC B/D
Operates the FIL8548 IC(IC700)?
Yes
No Yes
Is normal the Ctrl
Board of Module? Replace Ctrl B/D.
No

- 19 -
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
2) In case of does't display the screen into specific mode
(1) Symptom
- The screen does not become the display from specific input mode
(RF, AV, Component, RGB, DVI).
(2) Check follow
(1) Check the all input mode should become normality display.
(1) Check the Video(Main)/Data(Sub), Video(Main)/Video(Sub) should become
normality display from the PIP mode or DW mode. (Re-Check it Swap)
(3) In case of becomes unusual display from RF mode
Is normal the
Tuner?
Is normal the Input voltage, IIC
Communication and CVBS output?
Replace Tuner
Is the Tuner Cable
connected well?
Cable inserts well.
Yes
No
No No
Yes
Is normal the
CXA2069Q? Replace IC
Is normal the Input voltage, IIC
Communication and HV sync?
Yes
No Yes
Replace IC
Yes
Is normal the
FIL8548?
Is normal the Input voltage, IIC
Communication and HV sync?
No
Block A

- 20 -
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
(4) In the case of becomes unusual display from side S-video/AV mode
Is Video input of the
AV Jack (P1400)
normal?
Check the input source.
Is normal the Input voltage,
IICCommunication and HV sync?
Yes
No
No Replace IC
No
Replace IC
No
Is normal the
CXA2069Q?
Yes
Same as Block A
(5) In the case of becomes unusual display from Component, RGB mode
Is R,G,B input and
H,V Sync of the J1100
normal?
Yes
Check the input source.
No
Same as Block A
(6) In the case of becomes unusual display from HDMI mode
Is normal the
HDMI002 (IC1004)?
Yes
Is normal the Input voltage, IIC
Communication and HV sync?
No
Same as Block A