LG 37LC2D Series User manual

R
LCD TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : LT61A
FACTORY NAME : 37LC2D-DA
MODEL : 37LC2D
website:http://biz.LGservice.com
e-mail:http://www.LGEservice.com/techsup.html

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CONTENTS
CONTENTS .............................................................................................. 2
PRODUCT SAFETY ..................................................................................3
SPECIFICATION........................................................................................6
ADJUSTMENT INSTRUCTION .................................................................9
TROUBLE SHOOTING............................................................................13
BLOCK DIAGRAM...................................................................................16
EXPLODED VIEW .................................................................................. 18
REPLACEMENT PARTS LIST ............................................................... 20
SVC. SHEET ...............................................................................................

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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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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
circuitboard 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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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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SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement .
1. Application range
This specification is applied to LT61A chassis.
2. Specification
Each part is tested as below without special appointment.
(1) Temperature : 25°C±2°C(77±9°F)
(2) Humidity : 65%±10%
(3) Power : Standard input voltage (110V@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
3.1 Performance : LGE TV test method followed
3.2 Demanded other specification
Safety : CNS Specification
EMC : CNS Specification
4. General Specification
No. Item Specification Remark
Min Typ Max Unit
1 Broadcasting system Analog : NTSC-M, DTV : DVB-T
2 Available Channel 1) VHF : 2~13
2) UHF : 14~69
3) CATV : 1~125
4) DTV : 14~69
3 Tuner IF 1) NTSC-M : 45.75MHz(Picture)
41.25MHz(Sound)
2) DVB-T : 36.125MHz
4 Input Voltage AC 110V, 60Hz Maker : LGE
5 LCD Module LC370WX1-SL11(1366X768) Maker : LG Philips LCD
6 Aspect ratio 16:9(wide)
7 Operating Temperature 0 40 deg
8 Operating Humidity 85 %
9 Storage Temperature -20 60 deg
10 Storage Humidity

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5. Chroma & Brightness
6. Component Video Input (Y, PB, PR)
No Item Min Typ Max Unit Remark
1 Brightness 300 450 cd/m2
2 Contrast Ratio 400:1 600:1
3 Luminance Variation 1.3 %
4 Viewing Angle(Left, Right, Up, Down) 85 88 Degree
5 Color coordinate RED X Typ 0.640 Typ
Y - 0.03 0.341 + 0.03
GREEN X 0.287
Y 0.610
BLUE X 0.146
Y 0.069
WHITE X 0.285
(Standard) Y 0.293
6 Color Temperature Medium 8,300 9,300 10,300 oK <Test Signal>
Cool 10,000 11,000 12,000 oK HDMI input,
Warm 5,500 6,500 7,500 oK PSM : Dynamic85%
Full white pattern,
5MPCD
No Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Remarks
1. 720*480 15.73/15.75 59.94/60.00 13.50 SDTV 480i
2. 720*480 31.47/31.50 59.94/60.00 27.00 SDTV 480p
3. 1280*720 44.96/45.00 59.94/60.00 74.25 HDTV 720P
4. 1920*1080 33.72/33.75 59.94/60.0 74.25 HDTV 1080i
7. RGB, HDMI/DVI input (DTV / PC)
No Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Remarks
DTV
1. 720*480 31.47/31.50 59.94/60.00 27.00 SDTV 480p
2. 1280*720 44.96/45.00 59.94/60.00 74.25 HDTV 720P
3. 1920*1080 33.72/33.75 59.94/60.0 74.25 HDTV 1080i
PC
1. 640*350 31.468 70.09 25.17 EGA
2. 640*480 31.469 59.94 25.17 VESA(VGA)
3. 640*480 37.861 72.80 31.50 VESA(VGA)
4. 640*480 37.500 75.00 31.50 VESA(VGA)
5. 800*600 35.156 56.25 36.00 VESA(SVGA)
6. 800*600 37.879 60.31 40.00 VESA(SVGA)
7. 800*600 48.077 72.18 50.00 VESA(SVGA)
8. 800*600 46.875 75.00 49.50 VESA(SVGA)
9. 1024*768 48.363 60.00 65.00 VESA(XGA)
10. 1024*768 56.476 70.06 75.00 VESA(XGA)
11. 1024*768 60.023 75.02 78.75 VESA(XGA)

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8. General specifications(module)
9. Electro Optical Characteristic Specifications (module standard)
10. Mechanical Spec.
No Item Typ Unit Remark
1 Active Screen Size 940.3(diagonal) mm 37.02 inches
2 Outline Dimension 877(H) x 516.8(V) x 55.5(D) mm Typ.
3 Pixel Pitch 200 x 600 x RGB
4 Pixel Format 1366(H)x768(V) RGB stripe arrangement
5 Color Depth 8bit 16.7 Mbit
6 Luminance ,White 500 cd/m2 Center 1 point
7 Viewing Angle (CR>10) R/L 176(Typ),U/P 176(Typ) degree
8 Power Consumption 125 Watt Typ.
9 Weight 11.5 kg
10 Display Operating Mode Transmissive mode ,normally black
11 Surface Treatment Hard coating (3H), Anti-glare treatment
12 Altitude Operating 0 - 14,000 feet 4,267.2 m
Storage/Shipment 0 - 40,000 feet 12,192.0 m
13 Lamp Life Time 50,000 (min.) Hrs 25±2°C
No Parameter Symbol Value Unit Remark
Min Typ Max
1. Contrast Ratio CR 600:1 800:1 It measured at center point
CR with AI 1200:1 1600:1
2. Surface Luminance, 400 500 Cd/m2Full white
white
3. Luminance Variation 1.3 (d white/5P)
4. Response Time Tr (Rising time) 8 14 msec
5. Color coordinate RED X Typ 0.640 Typ Full Pattern
Y -0.03 0.341 +0.03
GREEN X 0.287
Y 0.610
BLUE X 0.146
Y 0.069
WHITE X 0.285
Y 0.293
6. Viewing Angle (CR>10) X axis right( =0) 85 89
degree
X axis left( =180) 85 89
Yaxis up ( =90) 85 89
Y axis down( =270) 85 89
No Item Min Typ Max Unit Remark
1. C/A + MODULE GAP 0.5 0.7 1.0 mm
2. C/A+B/C GAP 0.2 0.5 0.8 mm
3. C/A+DECO FRONT GAP (ONE SIDE) 0.1 0.3 0.5 mm
4. Product Dimension (W) 811 X (H) 569.9 X (D) 123.5 mm With stand
(W) 811 X (H) 630 X (D) 235 mm
Product Weight 31.0 kg With stand

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ADJUSTMENT INSTRUCTION
1. Application Range
This spec. sheet is applied to all of the LT61A 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±5°C
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. EDID
[Caution
* Use the proper signal cable for EDID Download
- Analog EDID : Pin3 exists
=> Caution: - Never connect HDMI & D-sub Cable at the
same time.
- Use the proper cables below for EDID Writing
3.1 Data
1. ANALOG(128 Bytes)
2. HDMI(256 Bytes)
4. ADC Calibration
=> Caution: - System control RS-232 Host should be "PC" for
adjustment.
4.1 Adjustment of RF/VIDEO/S-VIDEO
[Required Equipments
lRemote controller for adjustment
lMSPG-925F Pattern Generator (Which has Video Signal:
100% Color Bar Pattern shown in Fig. 1)
=> Model: 201 / Pattern : 33 (NTSC-M)
4.1.1 Method of Auto RF/VIDEO/S-VIDEO Color Balance.
1) Input the Video Signal: 100% Color Bar signal into
VIDEO1
2) Set the EZ PICTURE to Optimum mode in the Picture
menu.
[Fig.1]
3) Press ADJ key on R/C for adjustment.
4) Press the G(Vol. +) key to operate the set, then it becomes
automatically.
5) Auto-RGB OK means the adjustment is completed.
4.2 Adjustment of Component.
[Required Equipments
lRemote controller for adjustment
lMSPG-925F Pattern Generator e Model: 217 / Pattern: 33
(Which has 720p YPbPr output Pattern shown in Fig. 2)
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 00 00 01 01 01 01
10 00 10 01 03 68 52 2F 96 EA D9 B0 A3 57 49 9C 25
20 11 49 4B AF CE 00 31 4F 45 4F 61 4F 01 01 01 01
30 01 01 01 01 01 01 1B 21 50 A0 51 00 1E 30 48 88
40 35 00 BC 88 21 00 00 1C 4E 1F 00 80 51 00 1E 30
50 40 80 37 00 BC 88 21 00 00 18 00 00 00 FD 00 38
60 4B 1F 3D 09 00 0A 20 20 20 20 20 20 00 00 00 FC
70 00 33 37 4C 43 32 44 2D 44 41 0A 20 20 20 00 F6
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 00 00 01 01 01 01
10 00 10 01 03 80 52 2F 96 EA D9 B0 A3 57 49 9C 25
20 11 49 4B A5 CE 00 31 4F 45 4F 61 4F 01 01 01 01
30 01 01 01 01 01 01 1B 21 50 A0 51 00 1E 30 48 88
40 35 00 BC 88 21 00 00 1C 4C 1F 00 90 51 00 1E 30
50 BB 88 97 00 A2 0B 32 00 00 1E 00 00 00 FC 00 33
60 37 4C 43 32 44 2D 44 41 0A 20 20 20 00 00 00 FD
70 00 38 4B 1F 3D 09 00 0A 20 20 20 20 20 20 01 76
80 02 03 1D 72 23 08 07 07 4A 85 04 03 02 01 14 13
90 12 11 00 83 01 00 00 65 03 0C 00 10 00 01 1D 80
A0 D0 72 1C 16 20 10 2C 25 80 C4 8E 21 00 00 9E 01
B0 1D 80 18 71 1C 16 20 58 2C 25 00 C4 8E 21 00 00
C0 9E 01 1D 00 BC 52 D0 1E 20 B8 28 55 40 C4 8E 21
D0 00 00 1E 01 1D 00 72 51 D0 1E 20 6E 28 55 00 C4
E0 8E 21 00 00 1E 8C 0A D0 8A 20 E0 2D 10 10 3E 96
F0 00 13 8E 21 00 00 18 00 00 00 00 00 00 00 00 1B
ADC RF/VIDEO/S-VIDEO Component RGB
MSPG925F VIDEO1 Model: 217(720P) Model: 39
Model: 201 (NTSC-M) Pattern: 33 (1024*768 60Hz)
Pattern: 33 *720P 100% Color Bar Pattern: 33
*NTSC 100% Color Bar *XGA 100% Color Bar

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4.2.1 Method of Auto Component Color Balance
1) Input the Component 720p 100% Color Bar(MSPG-925F
model:215, pattern:33) signal into Component.
2) Set the EZ PICTURE to Optimum mode in the Picture
menu.
[Fig.2]
3) Press the ADJ key on R/C for adjustment.
4) Press the G(Vol. +) key to operate the set, then it becomes
automatically.
5) Auto-RGB OK means the adjustment is completed.
4.3 Adjustment of RGB
[Required Equipments
lRemote controller for adjustment
lMSPG-925F Pattern Generator
(Which has XGA [1024*768] 60Hz PC Format output with
100% Color Bar Pattern shown in Fig. 3)
4.3.1 Method of Auto RGB Color Balance
1)Input the PC 1024x768 @ 60Hz 100% Color Bar
Pattern(MSPG-925F model:39, pattern:33) into RGB.
(using D-sub cable)
2) Set the EZ PICTURE to Optimum mode in the Picture
menu
[Fig.3]
3) Press the ADJ key on R/C for adjustment.
4) Press the G(Vol. +) key operate To set , then it becomes
automatically.
5) Auto-RGB OK means adjustment is completed.
Before White-balance, the AV ADC should be done.
Notice : Before White-balance, change input mode
- Move to VIDEO1 by using Remote controller
5. White Balance
=> Caution : - System control RS-232 Host should be "PC"
for adjustment.
- VIDEO ADC(VIDEO1) should be done before
White-balance.
-Press FRONT-AV on control R/C before
Automatic Adjustment
* Test Equipment
Color Analyzer (CA-110)
PC (for communication through RS-232C) => UART Baud
rate : 115200
Pattern Generator (MSPG-925F)
* Target Value (PSM: Dynamic, CSM: Normal)
- Normal(9300K) x : 283±0.003, y : 298±0.003
- Luminance(Y)VIDEO/COMP: 200 Cd/m2 (Typ: 250 Cd/m2)
PC : 250 Cd/m2 (Typ: 300 Cd/m2)
-> Reference Value(Automatically fixed)
- Cool(11000K) - x: 0.274±0.003, y: 0.286±0.003
- Warm(7200K) - x:0.303±0.003, y: 0.319±0.003
5.1 Manual white Balance (AV)
1) Execute CA-110 Zero Calibration.
2) Execute the SET Heat Run for 30minutes
3) Push the ADJ Button then you can see the OSD
4) Push the ADJ Button again for White Balance mode
5) Adjust High light with R/B Gain/Offset(G Gain fix, G
Offset fix)
[If B is max, adjust R/G additionally.
White balance VIDEO1
MSPG925F High Model : 201(NTSC-M)
*216Gray Pattern : 78
*NTSC Video

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6. Shipping Conditions
6.1 Input the Shipping Option Data
1) Push the IN-START key in the Adjust Remocon.
2) Change the General Option value to "20".
2-1) Select "General Option" by using D/E(CH+/-) key ,
and press the number key(0~9) consecutively
ex) If the value of OPTION1 is 20, input the data using
number key "2" &"0" (Fig. 1)
(Fig. 1)
6.2 Shipped Condition
No Item Condition Remark
1 Power Off
2 Volume Level 30
3 Main Picture Input DTV
4 Main Last Channel
5 Mute Off
6 Screen Size Auto
7 Station Auto Program
Manual Program
Favorite Channel None
8 Picture EZ PICTURE Clear
Clear Contrast 100
Brightness 45
Color 50
Sharpness 50
Tint 0
Activate depend
on Color sys.
ACC Cool
XD On
ACM Fleshtone : 1
Greentone : 1
Bluetone : 1
No Item Condition Remark
9 Sound EZ SOUND FLAT
AVL Off
Balance 0
Treble 50
Bass 50
TV Speaker On
10 Timer Clock --:-- AM
Off Timer Off
On Timer Off
Auto off Off
11 Special Language Chinese
Key Lock Off
Set ID 1
Caption/Text Off
XD Demo
12 Screen Auto config. Variable by
Manual config. each mode
XGA Mode
ARC
Zoom +/-
Position
Cinema
NR
Reset

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SVC REMOCON
1 POWER
2 POWER ON
3 MUTE
4 P-CHECK
5 S-CHECK
6 ARC
7 CAPTION
8 TXT
9 TV/AV
10 TURBO SOUND
11 TURBO PICTURE
12 IN-START
13 ADJ
14 MPX
15 EXIT
16 APC(PSM)
17 ASC(SSM)
18 MULTIMIDIA
19 FRONT-AV
20 CH
21 VOL
22 ENTER
23 PIP CH-(OP1)
24 PIP CH+(OP2)
25 PIP SWAP(OP3)
26 PIP INPUT(OP4)
27 EYE
28 MENU
29 IN-STOP
30 STILL
31 TIME
32 SIZE
33 MULTI PIP
34 POSITION
35 MODE
36 PIP
37 TILT
38 0~9
To turn the TV on or off
To turn the TV on automatically if the power is supplied to the TV. (Use the
POWER key to deactivate): It should be deactivated when delivered.
To activate the mute function.
To check TV screen image easily.
To check TV screen sound easily
To select size of the main screen (Normal, Spectacle, Wide or Zoom)
Switch to closed caption broadcasting
To toggle on/off the teletext mode
To select an external input for the TV screen
To start turbo sound
To start turbo picture
To enter adjustment mode when manufacturing the TV sets.
To adjust the screen voltage (automatic):
In-start mute Adjust AV(Enter into W/B adjustment mode)
W/B adjustment (automatic):
After adjusting the screen W/B adjustment Exit two times (Adjustment completed)
To enter into the adjustment mode. To adjust horizontal line and sub-brightness.
To select the multiple sound mode (Mono, Stereo or Foreign language)
To release the adjustment mode
To easily adjust the screen according to surrounding brightness
To easily adjust sound according to the program type
To check component input
To check the front AV
To move channel up/down or to select a function displayed on the screen.
To adjust the volume or accurately control a specific function.
To set a specific function or complete setting.
To move the channel down in the PIP screen.
To use as a red key in the teletext mode
To move the channel in the PIP screen
To use as a green key in the teletext mode
To switch between the main and sub screens
To use as a yellow key in the teletext mode
To select the input status in the PIP screen
To use as a blue key in the teletext mode
To set a function that will automatically adjust screen status to match
the surrounding brightness so natural color can be displayed.
To select the functions such as video, voice, function or channel.
To set the delivery condition status after manufacturing the TV set.
To halt the main screen in the normal mode, or the sub screen at the PIP screen.
Used as a hold key in the teletext mode (Page updating is stopped.)
Displays the teletext time in the normal mode
Enables to select the sub code in the teletext mode
Used as the size key in the PIP screen in the normal mode
Used as the size key in the teletext mode
Used as the index key in the teletext mode (Top index will be
displayed if it is the top text.)
To select the position of the PIP screen in the normal mode
Used as the update key in the teletext mode (Text will be
displayed if the current page is updated.)
Used as Mode in the teletext mode
To select the simultaneous screen
To adjust screen tilt
To manually select the channel.
Shortcut keys
Shortcut keys
Shortcut keys
Use the AV
key to enter
the screen
W/B
adjustment
mode.
Shortcut keys
Shortcut keys
Shortcut keys

- 13 -
TROUBLESHOOTING
NO POWER
(POWER INDICATOR OFF)
REPLACE POWER BOARD
CHECK POWER BOARD
CHECK CN804
VOLTAGE (P-ST_5V) No
CHECK CRYSTAL X800
CHECK CRYCTAL
X800(19.6608MHZ) No
Yes
CHECK IC806
CHECK IC806 VOLTAGE (5V) No
Yes
CHECK Q1001
CHECK Power on/off
(5V) No
Yes
Yes

- 14 -
NO VIDEO
REPLACE LCD MODULE
CHECK THE PERIPHERAL
IC800
CHECK LVDS Output
P3(PIN 21, PIN 22) No
CHECK THE PERIPHERAL
IC1
DOWN LOAD ISP DATA
or REPLACE MAIN BOARD
Check L2
(12V) No
Yes
CHECK L1022
(24V) CHECK R898 (3.3V)
No
Yes
Yes Yes No

- 15 -
NO SOUND
REPLACE JACK BOARD
INSERT CABLES WELL
IS THE SPK CABLE
CONNECTED WELL? No
CHECK IC302 OR CHANGE
DOES IC302 OPERATE? No
Yes
CHECK IC301 OR CHANGE
DOES IC301 OPERATE? No
Yes
CHECK X300 OR CHANGE
DOES IC300 OPERATE?
DOES IC400 OPERATE?
No
Yes
Yes
Yes
CHECK X400 OR CHANGE
No

BLOCK DIAGRAM(VIDEO)
- 16 -
3.3V 1.8V 3.3V 2.5V 1.8V
3.3V 1.8V
9V
12C
12C
12C
12C
RX/TX
RX_0/1/2/C
DDC_SCL/SDA RGB PC/DTV_H/V RGB PC/DTV_H/V
H/V Sync_CLK_DE
HDMI_DATA[0-23]
TX/RX_COR
SCL/SDA
SCL/SDA
CH DATA 0/1/2/3 +,- CH CLK +,-
SCL/SDA
SCL/SDA SCL/SDA
RF Jack1 for Digital
D_COMP_YPbPr_HUD
25P from Digital Module
RX/TX_STI
D_COMP_YPbPr
LVDS 31P
MODULE_ON OFF/DISP_EN
RGB/SDA
COMP1_Rear Y/Pb/Pr
V V
Y/C
AV1_Rear/AV2_Side Monitor out_Rear S-Video/Rear
TU_Main_CVBS
MAIN_V/Y
MAIN_DE
SYNC_DE
SUB_V/Y/C
RGB_Rear RGB
CVBS
RX/TX
RX/TX_HUDSON
RX/TX_STI
24Bit_B
12C UART DTuner
12C
ATuner
STC3232
CM2021
CAT24WC02
74F14SCX
CAT24WC02
LA7217
TC74LCX157
24C32
24C256
HY5DU281622
FLI8125AA-LP
(HUDSON)
0X6C
FLI8532
(Cortez)
SIL9011
(HDMI
RECEIVER)
0X62
CXA2069
(A/V SW
0X90)
HY5DU281622
MX29LV16

- 17 -
BLOCK DIAGRAM(AUDIO)
Digital Module
9V
12V
3.3V 1.8V
5V 9V 3.3V
2.5V 1.8V
3.3V 2.5V
HY5DU281622
MX 29LV16
FLI8532
(Cortez)
Audio Decoder
MSP4410K
Audio SW &
Tone Control
0X80
CAX2069
(A/V SW)
0X09
Sil9011
TMDS Rx
(HDCP)
0X62
Sound
Control
NSP 2100A
(PWM MOD)
0X6C
TAS5112
(Digital Amp)
HY5DU281622
19V

- 18 -
010
050
051 020 100
110 120
140 140
030
060
070
080
090 150 160
040
EXPLODED VIEW

- 19 -
EXPLODED VIEW PARTS LIST
No. PART NO. DESCRIPTION
ACQ30231403 Cover Assembly, 37LC2D-DA LT61A 37" 37LC2D- DA
6304FLP360A LCD,Panel-TFT, LC370WX1-SL11 37INCH 1365X768 500CD COLOR 72% -
3809900164E Cover Assembly, 37LC2R-ZH NON H3-H
3043900032K Base Assembly, BASE 37LC2 LP61A STAND ASSY
49509K0023C Plate, PRESS SBHG T1.6 SIDE SUPPORTER RIGHT FOR 37LC2
49509K0024E Plate, PRESS SBHG T1.6 SIDE SUPPORTER LEFT FOR 37LC2
68719STA81A PCB Assembly,Sub, SUB T.T LT61A 37LC2D-DA TAIWAN SIDE AV ASSY
49509K0222A Plate, PRESS SBHG T2.0 SUPPORT STAND 37LC2
68719ST934A PCB Assembly,Sub, SUB T.T LP61A 26LC2R ZJ LOCAL
EBR30716801 PCB Assembly, SUB S.T LT61A 37LC2D-DA Taiwan IR main assy
4950TKA361Q Plate, FRAME MAIN 37LC2D-DA
6709900016D
SMPS,AC/DC, LGLP2637HEP 90.0VTO264.0V 215W 47TO63HZ UL/CSA/SEMKO YY / AT / HE
or 6709900016B Power Supply Assembly, FREE H3/E2 LCD MODEL LCD LG ELECTRONICS LB LC 37INCH
31419MNV37A Chassis Assembly, MAIN LT61A TAIWAN DTV 37LC2D-DA MAIN LEVEL
68719STA79A
PCB Assembly,Sub, SUB T.T LT61A 37LC2D-DA TOTAL IDTV DIGITAL RECEIVER MODULE
4950TKA362Q Plate, SHIELD MAIN (37LC2D-DA)
EAB30829201 Speaker,Woofer, g1560102 ND 15W 8OHM 82DB 100HZ 193 X 57 X 50 LUG
35509K0217A Cover, MOLD HIPS 37LC2 STAND MID INNER
010
020
030
040
050
051
060
070
080
090
100
110
120
130
140
150
160

- 20 -
DATE: 2006. 07. 04.
*S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION
C100 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C1002 0CE476WF6DC MVK6.3TP16VC47M 47uF 20% 16
C1007 0CE476WF6DC MVK6.3TP16VC47M 47uF 20% 16
C1009 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C1012 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C1013 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C1018 0CE476WF6DC MVK6.3TP16VC47M 47uF 20% 16
C1019 0CE476WF6DC MVK6.3TP16VC47M 47uF 20% 16
C1023 0CE477WF6DC MVK10TP16VC470M 470uF 20% 1
C1025 0CE477WF6DC MVK10TP16VC470M 470uF 20% 1
C1028 0CE477WF6DC MVK10TP16VC470M 470uF 20% 1
C1030 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C1035 0CE476WF6DC MVK6.3TP16VC47M 47uF 20% 16
C1037 0CE477WF6DC MVK10TP16VC470M 470uF 20% 1
C1040 0CE476WF6DC MVK6.3TP16VC47M 47uF 20% 16
C1042 0CE477WF6DC MVK10TP16VC470M 470uF 20% 1
C1045 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C1048 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C1049 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C1054 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C1055 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C1060 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C1061 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C1064 0CE476WF6DC MVK6.3TP16VC47M 47uF 20% 16
C1069 0CE476WF6DC MVK6.3TP16VC47M 47uF 20% 16
C1070 0CE476WF6DC MVK6.3TP16VC47M 47uF 20% 16
C1073 0CE477WF6DC MVK10TP16VC470M 470uF 20% 1
C1075 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C1078 0CE476WF6DC MVK6.3TP16VC47M 47uF 20% 16
C108 0CE477WF6DC MVK10TP16VC470M 470uF 20% 1
C1084 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C1085 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C1090 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C1091 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C1096 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C1097 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C110 0CE477WF6DC MVK10TP16VC470M 470uF 20% 1
C1105 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C1107 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C111 0CE475WK6DC MVK5.0TP50VC4.7M 4.7uF 20%
C1110 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C1112 0CE476WF6DC MVK6.3TP16VC47M 47uF 20% 16
C1114 0CE477WF6DC MVK10TP16VC470M 470uF 20% 1
C1117 0CE476WF6DC MVK6.3TP16VC47M 47uF 20% 16
C112 0CE227WF6DC MVK8.0TP16VC220M 220uF 20%
C1128 0CE476WF6DC MVK6.3TP16VC47M 47uF 20% 16
C1129 0CE476WF6DC MVK6.3TP16VC47M 47uF 20% 16
C113 0CE106WFKDCMVK4.0TP16VC10M 10uF 20% 16
C1130 0CE476WF6DC MVK6.3TP16VC47M 47uF 20% 16
C1131 0CE476WF6DC MVK6.3TP16VC47M 47uF 20% 16
C1132 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C1134 0CE476WF6DC MVK6.3TP16VC47M 47uF 20% 16
C1136 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C114 0CE475WK6DC MVK5.0TP50VC4.7M 4.7uF 20%
C1140 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C1144 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
DATE: 2006. 07. 04.
*S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION
C1148 0CE477WF6DC MVK10TP16VC470M 470uF 20% 1
C1151 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C1152 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C1157 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C1158 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C1161 0CE476WF6DC MVK6.3TP16VC47M 47uF 20% 16
C1168 0CE476WF6DC MVK6.3TP16VC47M 47uF 20% 16
C1170 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C1174 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
C1178 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
C1189 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
C1190 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
C1191 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
C1193 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
C1195 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
C1197 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
C1200 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
C1202 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
C1204 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
C1206 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
C1207 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
C1208 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
C121 0CE476WF6DC MVK6.3TP16VC47M 47uF 20% 16
C1214 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
C1230 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
C1231 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
C1264 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
C1265 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
C1266 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
C1268 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
C1273 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
C1275 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
C1283 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
C1285 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
C1296 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
C1299 0CE107WH6DCMVK8.0TP25VC100M 100uF 20%
C130 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
C1302 0CE107WH6DCMVK8.0TP25VC100M 100uF 20%
C1305 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
C1307 0CE476WF6DC MVK6.3TP16VC47M 47uF 20% 16
C1314 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
C1332 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C1405 0CE476WF6DC MVK6.3TP16VC47M 47uF 20% 16
C1406 0CE476WF6DC MVK6.3TP16VC47M 47uF 20% 16
C1408 0CE476WK6DC MVK8.0TP50VC47M 47uF 20% 50
C1415 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C150 0CE107WF6DC MVK6.3TP16VC100M 100uF 20%
C153 0CE476WK6DC MVK8.0TP50VC47M 47uF 20% 50
C213 0CE106WFKDCMVK4.0TP16VC10M 10uF 20% 16
C215 0CE106WFKDCMVK4.0TP16VC10M 10uF 20% 16
C216 0CE106WFKDCMVK4.0TP16VC10M 10uF 20% 16
C223 0CE106WFKDCMVK4.0TP16VC10M 10uF 20% 16
C229 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
C230 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16
REPLACEMENT PARTS LIST
CAPACITOR
For Capacitor & Resistors, the
charactors at 2nd and 3rd digit in the
P/No. means as follows;
CC, CX, CK, CN, CH : Ceramic
CQ : Polyestor
CE : Electrolytic
CF : Fixed Film
RD : Carbon Film
RS : Metal Oxide Film
RN : Metal Film
RH : CHIP, Metal Glazed(Chip)
RR : Drawing