LG 47LB5DF User manual

LCD TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : LA75A
MODEL : 47LB5DF 47LB5DF-UL
website:http://biz.LGservice.com
Internal Use Only

Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
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CONTENTS
CONTENTS .............................................................................................. 2
PRODUCT SAFETY ..................................................................................3
SPECIFICATION........................................................................................6
ADJUSTMENT INSTRUCTION ...............................................................13
TROUBLE SHOOTING............................................................................18
BLOCK DIAGRAM...................................................................................23
EXPLODED VIEW .................................................................................. 24
SVC. SHEET ...............................................................................................

Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
- 3 -
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

Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
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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

Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
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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.

Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
- 6 -
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement .
4. General Specification(TV)
No. Item Specification Remark
1. Receiving System ATSC/64 & 256 QAM/ NTSC-M
2. Available Channel 1) VHF : 02~13
2) UHF : 14~69
3) DTV : 02-69
4) CATV : 01~135
5) CADTV : 01~135
3. Input Voltage 1) AC 100 ~ 240V 50/60Hz
4. Market NORTH AMERICA
5. Screen Size 47 inch Wide(1920 x 1080) 47LB5DF
42 inch Wide(1920 x 1080) 42LB5DF
6. Aspect Ratio 16:9
7. Tuning System FS
8. LCD Module LC470WU1-SLB2 47LB5DF
LC420WU2-SLB1 42LB5DF
9. Operating Environment 1) Temp : 0 ~ 40 deg
2) Humidity : ~ 80 %
10. Storage Environment 1) Temp : -20 ~ 60 deg
2) Humidity : ~ 85 %
1. Application Range.
This spec sheet is applied to the 42"/47" LCD TV used LA75A
chassis.
2. Specification
Each part is tested as below without special appointment
2.1 Temperature : 25±5°C(77±9°F), CST : 40±5°C
2.2 Relative Humidity : 65±10%
2.3 Power Voltage : Standard input voltage
(100~240V@ 50/60Hz)
• Standard Voltage of each products is marked by models
2.4 Specification and performance of each parts are followed
each drawing and specification by part number in
accordance with BOM .
2.5 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 : UL, CSA, IEC specification
3.3 EMC : FCC, ICES, IEC specification

Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
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5. Chrominance & Luminance Specification
No Item Min Typ Max Unit Remark
1. White peak brightness 400 550 cd/m247LB5DF
400 550 cd/m242LB5DF
2. Contrast ratio cd/m2N/A
3. Brightness uniformity 80 % Full white
4. Color coordinate RED X Typ 0.638 Typ 42LB5DF Only in Blue
-0.03 0.640 +0.03
Y 0.340 42LB5DF Only in Blue
0.343
GREEN X 0.279 42LB5DF Only in Blue
0.287
Y 0.611 42LB5DF Only in Blue
0.613
BLUE X 0.146 42LB5DF Only in Blue
0.144
Y 0.062 42LB5DF Only in Blue
0.065
WHITE X 0.272 42LB5DF Only in Blue
0.279
Y 0.278 42LB5DF Only in Blue
0.292
5. Color coordinate uniformity N/A
6. Contrast ratio 600:1 800:1 47LB5DF
700:1 1000:1 42LB5DF
7. Color Temperature Cool 10,000 11,000 12,000 <Test Signal>
Medium 8,300 9,300 10,300 HDMI input
Warm 5,500 6,500 7,500 85% Full white pattern
8. Color Distortion, DG 10.0 %
9. Color Distortion, DP 10.0 deg
10. Color S/N, AM/FM 43.0 dB
11. Color Killer Sensitivity -80 dBm

Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
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Peak & average Brightness & Contrast measure standard specification
- White Peak brightness measure specification
1) In non-impressed condition, measure peak brightness displayable as much as possible LCD module.
2) Measuring instrument: CA-110 or a sort of Color Analyzer.
3) Pattern Generator : VG-828 or a sort of digital pattern generator (displayable Full White & 1/25 White Window pattern)
4) Measure condition
- Test pattern: in center, 1/5(H)x1/5(V) of Window Pattern (white pattern in non-impressed condition)
- SET condition : Contrast & Brightness Level 100%
- Environment condition : Dark room in the non outside light
- Video menu option condition
5) Measurement
- Do heat-run LCD module at 30minutes in normal temperature (25°C) by using full white pattern of 15% signal level(38 gray
level).
- Impress test pattern signal in 1/5(H)x1/5(V) White Window of 100%(255Gray Level)
- measure 3 times brightness of central white window, and mark peak brightness in max brightness degree
- measure the same condition in video signal /RGB signal.
Average Brightness measure specification
1) Impress 100%(255Gray Level) full white pattern at the same peak brightness measurement.
2) Measure average brightness in 9 points.
Contrast ratio measure specification
1) Test display signal : 30x30 dots White Window signal & all Black Raster signal
2) Dark room measure condition : Using touch type Color analyzer CA-100 Dark room in the non outside light
3) Bright room measure condition : In bright room of 150Lx illumination in the panel surface, locate a source of light on the above
45°of the panel surface.
4) Measure method
- In standard test condition, impress 30x30 dots White Window Pattern signal .
Measure center peak brightness degree Lw of white window
- Impress black Raster signal as contrast ratio measurement signal.
Measure black brightness degree Lb of PDP central
Calculate the following numerical formula.
Contrast ratio = Lw / Lb
* If it does not use Prior measurement, use generally simple test measurement.
The Correct measure specification is followed by IEC61988-2/CD, JAPAN EIAJ-2710
Signal Picture Mode XD Black Level
RF NTSC-M USER1 Off N/A
AV NTSC-M USER1 Off Low
Component 720P USER1 Off N/A
RGB 1024x768 USER1 N/A N/A
HDMI DTV 720P USER1 Off High
1 4 7
2 5 8
3 6 9

Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
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6. Component Video Input (Y, PB, PR)
No. Specification Remark
Resolution H-freq(kHz) V-freq(Hz)
1. 720*480 15.73 60 SDTV ,DVD 480I
2. 720*480 15.73 59.94 SDTV ,DVD 480I
3. 720*480 31.47 60 SDTV 480P
4. 720*480 31.47 59.94 SDTV 480P
5. 1280*720 45.00 60.00 HDTV 720P
6. 1280*720 44.96 59.94 HDTV 720P
7. 1920*1080 33.75 60.00 HDTV 1080I
8. 1920*1080 33.72 59.94 HDTV 1080I
9. 1920*1080 67.500 60 HDTV 1080P
10. 1920*1080 67.432 59.939 HDTV 1080P
11. 1920*1080 27.000 24.000 HDTV 1080P
12. 1920*1080 26.97 23.94 HDTV 1080P
13. 1920*1080 33.75 30.000 HDTV 1080P
14. 1920*1080 33.71 29.97 HDTV 1080P
7. RGB PC
No. Resolution H-freq(kHz) V-freq(Hz) Pixel clock(MHz) Remark
PC DDC
1. 640*350 31.468 70.09 25.17 EGA X
2. 720*400 31.469 70.08 28.32 DOS O
3. 640*480 31.469 59.94 25.17 VESA(VGA) O
4. 640*480 37.861 72.80 31.50 VESA(VGA) O
5. 640*480 37.500 75.00 31.50 VESA(VGA) O
6. 800*600 35.156 56.25 36.00 VESA(SVGA) O
7. 800*600 37.879 60.31 40.00 VESA(SVGA) O
8. 800*600 48.077 72.18 50.00 VESA(SVGA) O
9. 800*600 46.875 75.00 49.50 VESA(SVGA) O
10. 1024*768 48.363 60.00 65.00 VESA(XGA) O
11. 1024*768 56.476 70.06 75.00 VESA(XGA) O
12. 1024*768 60.023 75.02 78.75 VESA(XGA) O
13. 1280*768 47.776 59.870 79.5 CVT(WXGA) O
14. 1280*768 60.289 74.893 102.25 CVT(WXGA) O
15. 1360*768 47.712 60.015 85.50 VESA (WXGA) O
16. 1280*1024 63.981 60.020 108.00 VESA (SXGA) O
17. 1280*1024 79.976 75.025 135 VESA (SXGA) O
18. 1600*1200 75.00 60.00 162 VESA (UXGA) O
19 1920*1080 67.5 60 148.5 HDTV 1080P O

Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
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8. HDMI Input (PC/DTV)
No. Resolution H-freq(kHz) V-freq(Hz) Pixel clock(MHz) Remark
PC DDC
1 640*350 31.468 70.09 25.17 EGA X
2 720*400 31.469 70.08 28.32 DOS _
3 640*480 31.469 59.94 25.17 VESA(VGA) _
4 640*480 37.861 72.80 31.50 VESA(VGA) _
5 640*480 37.500 75.00 31.50 VESA(VGA) _
6 800*600 35.156 56.25 36.00 VESA(SVGA) _
7 800*600 37.879 60.31 40.00 VESA(SVGA) _
8 800*600 48.077 72.18 50.00 VESA(SVGA) _
9 800*600 46.875 75.00 49.50 VESA(SVGA) _
10 1024*768 48.363 60.00 65.00 VESA(XGA) _
11 1024*768 56.476 70.06 75.00 VESA(XGA) _
12 1024*768 60.023 75.02 78.75 VESA(XGA) _
13 1280*768 47.776 59.870 79.5 CVT(WXGA) _
14 1360*768 47.712 60.015 85.50 VESA (WXGA) _
15 1280*1024 63.981 60.020 108.00 VESA (SXGA) _
16 1280*1024 79.976 75.025 135 VESA (SXGA) _
17 1600*1200 75.00 60.00 162 VESA (UXGA) _
18 1920*1080 67.5 60 148.5 HDTV 1080P _
DTV
1 720*480 31.47 60 SDTV 480P
2 720*480 31.47 59.94 SDTV 480P
3 1280*720 45.00 60.00 HDTV 720P
4 1280*720 44.96 59.94 HDTV 720P
5 1920*1080 33.75 60.00 HDTV 1080I
6 1920*1080 33.72 59.94 HDTV 1080I
7 1920*1080 67.500 60 HDTV 1080P
8 1920*1080 67.432 59.939 HDTV 1080P
9 1920*1080 27.000 24.000 HDTV 1080P
10 1920*1080 26.97 23.94 HDTV 1080P
11 1920*1080 33.75 30.000 HDTV 1080P
12 1920*1080 33.71 29.97 HDTV 1080P

Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
- 11 -
9. General specifications
9-1. 47" LCD MODULE
No Item Specification Unit Remark
1 Active Screen Size 46.96 inches(1192.87mm) mm
2 Outline dimension 1096.0(H)x640.0(V)x481(D) mm
3 Pixel Pitch 0.5415x0.5415x RGB mm
4 Pixel Format 1920 horiz by 1080 vert. RGB Stripe arrangement
5 Color Depth 8-bit / 16.7M Color
6 Luminance, White 550 cd/m2
7 Power Consumption Total 230.56 Watt
8 Weight 20.0Kg
9 Display Operating Mode Transmissive Mode, Normally Black
10 Surface Treatment
Hard Coating (3H) Anti-glare treatment of the front polarizer
9-2. 42" LCD MODULE
No Item Specification Unit Remark
1 Active Screen Size 42.02 inches(1067.31mm) mm
2 Outline dimension 983.0(H)x576.0(V)x47.3(D) mm
3 Pixel Pitch 0.4845x0.4845x RGB mm
4 Pixel Format 1920 horiz by 1080 vert. RGB Stripe arrangement
5 Color Depth 8-bit / 1.07Billion Color
6 Luminance, White 500 cd/m2 (Center 1 point, Typ) kg
7 Power Consumption Total 167.3 Watt(Typ)
8 Weight 11Kg(Typ), 12Kg(Max)
9 Display Operating Mode Transmissive Mode, Normally Black
10 Surface Treatment
Hard Coating (3H), Anti-glare treatment of the front polarizer

Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
- 12 -
10. Mechanical specification
10-1. 47LB5DF
No. Item Content Unit Remark
1. Product Widt(W) Length(D) Height(H) mm
Dimension Before Packing 1144.5 331 825.6 mm With Stant
After Packing 1230 410 912 mm
2. Product Only SET 37.5 Kg
With BOX 44.7 Kg
10-2. 42LB5DF
No. Item Content Unit Remark
1. Product Widt(W) Length(D) Height(H) mm
Dimension Before Packing 1033.1±1.0 287.6±0.7 750±2.0 mm With Stant
After Packing 1119 374 858 mm
2. Product Only SET 27.5 Kg
With BOX 32.5 Kg

Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
- 13 -
ADJUSTMENT INSTRUCTION
1. Application Range
These instructions are applied to all of the LCD TV, LA75A
Chassis.
2. Notice
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 protect test instrument.
2.2 Adjustment must be done in the correct order. But it is
flexible when its factory local problem occurs.
2.3 The adjustment must be performed in the circumstance of
25±5°C of temperature and 65±10% of relative humidity if
there is no specific designation.
2.4 The input voltage of the receiver must keep 100~220V,
50/60Hz.
2.5 Before adjustment, execute Heat-Run for 30 minutes.
OAfter Receive 100% Full white pattern (06CH) then
process Heat-run
(Or 8. Test Pattern condition of Ez – Adjust)
O How to make set white pattern
A. Press Power ON button of Service Remocon
B. Press ADJ button of Service remocon. Select "10.
Test pattern" and, after select "White" using
navigation button, and then you can see 100% Full
White pattern.
* In this status you can maintain Heat-Run useless any
pattern generator
Notice) If you maintain one picture over 20 minutes
(Especially sharp distinction black with white pattern
– 13Ch, or Cross hatch pattern – 09Ch) then it can
appear image stick near black level
3. PCB Assembly Adjustment
3.1 Using RS-232C
See ADC Adjustment RS232C Protocol_Ver1.0
ONecessary items before Adjustment items
- Pattern Generator : (MSPG-925FA)
- Adjust 480i Comp1 (MSPG-925FA:model :209 , pattern :65)
- Adjust 1080p Comp1/RGB(MSPG-925FA:model :225 ,
pattern :65)
* If you want more information then see the below Adjustment
method (Factory Adjustment)
OAdjustment sequence
- ad 00 00 : Enter the ADC Adjustment mode.
- kb 00 04 : Change the mode to Component1 (No actions)
-ad 0010:Adjust 480i Comp1(Change the mode and
adjustment action)
- kb 00 06 : Change to RGB-DTV mode(No action)
- ad 00 10 : Adjust 1080p Comp1/RGB(Change the mode
and adjustment action)
- ad 00 90 : End of the adjustment
Order
Command Set response
1. Inter the Adjustment mode ad 00 00 d 00 OK00x
2. Change the Source kb 00 04 b 00 OK04x (Adjust 480i Comp1)
kb 00 06
b 00 OK06x (Adjust 1080p Comp1/RGB)
3. Start Adjustment ad 00 10
4. Return the Response OKx ( Success condition )
NGx ( Failed condition )
5. Read Adjustment data (main) (main)
ad 00 20
000000000000000000000000007c007b006dx
(sub) (Sub)
ad 00 21
000000070000000000000000007c00830077x
6. Confirm Adjustment
ad 00 99 NG 03 00x (Failed condition)
NG 03 01x (Failed condition)
NG 03 02x (Failed condition)
OK 03 03x (Success condition)
7. End of Adjustment ad 00 90 d 00 OK90x

4. Factory Adjustment
4.1 Auto Adjust Component 480i/1080p
RGB 1080p
O Summary : Adjustment component 480i/1080i and RGB
1080p is Gain and Black level setting at Analog to
Digital converter, and compensate the RGB
deviation
O Using instrument
-Adjustment remocon, 801GF(802B, 802F, 802R) or
MSPG925FA pattern generator
(It can output 480i/1080i horizontal 100% color bar pattern
signal, and its output level must setting 0.7V±0.1V p-p
correctly)
* You must make it sure its resolution and pattern cause every
instrument can have different setting
O Adjustment method 480i Comp1, Adjust 1080p Comp1/RGB
(Factory adjustment)
1) ADC 480i Component1 adjustment
: Check connection of Component1
MSPG-925FA => Model: 209, Pattern 65
- Set Component 480i mode and 100% Horizontal Color
Bar Pattern(HozTV31Bar), then set TV set to
Component1 mode and its screen to "NORMAL"
- After get the signal, wait more a second and enter the
"Ez-Adjust" with press ADJ key of Service remocon.
After then select "3.ADC 480i Comp1" with navigator
button and press "Enter". It is automatically adjustment
- You can see "ADC Component1 Success" message
after Adjustment success
- Error Messages: When its adjustment is not correct,
"ADC Component1 480i Fail" message displayed. If
component is not connection "Component1 Not
Connected", its format is not 480i then "Not Valid
Format", its signal don’t out then "Check Signal Status"
message displayed. These messages will be displayed
just a second.
2) ADC 1080p Component1 / RGB adjustment
: Check connection both of Component1 and RGB
: MSPG-925FA Ë Model: 225, Pattern 65
- Set Component 1080p mode and 100% Horizontal
Color Bar Pattern(HozTV31Bar), then set TV set to
Component1 mode and its screen to "NORMAL"
- After get the signal, wait more a second and enter the
"Ez-Adjust" with press ADJ key of Service remocon.
After then select "4.ADC 1080p Comp1/RGB" with
navigator button and press "Enter". First, it is
automatically adjustment Component1.
- If adjustment is correctly finished, "ADC Component1
Success" message will be displayed. But adjustment is
not correctly finished, "ADC Component1 1080p Fail"
message will be displayed.
- After adjustment Component1 mode, move to RGB-DTV
mode automatically and RGB adjustment start. After
RGB Adjustment successfully finished, "ADC RGB
1080P Success" message will be displayed.
- If Adjustment doesn’t success, check conditions all of
the adjustment condition and adjustment again. See
"Error Messages" sentence.
- After adjustment finished, press "ADJ" key and exit from
Adjustment mode.
4.2 EDID (The Extended Display Identification
Data)/DDC (Display Data Channel)
Download.
O Summary
- It is established in VESA, for communication between PC
and Monitor without order from user for building user
condition. It helps to make easily use realize "Plug and
Play" function.
- For EDID data write, we use DDC2B protocol.
O Write HDMI EDID data
- Using instruments
(1) Jig. (PC Serial to D-Sub connection) for PC, DDC
adjustment.
(2) S/W for DDC recording (EDID data write and read)
(3) D-sub jack
(4) Additional HDMI cable connection Jig.
- Preparing and setting.
(1) Set instruments and Jig. Like pic.5), then turn on PC and
Jig.
(2) Operate DDC write S/W (EDID write & read)
(3) It will operate in the DOS mode.
- 14 -
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
(Adjustment pattern : 480i / 1080P 60Hz Pattern)
LCD TV SET
(or Digital Board)
Device configuration diagram for HDMI EDID Data input

O EDID data for LA75A Chassis
- HDMI1 EDID (DDC (Display Data Channel) Data
- HDMI2 EDID (DDC (Display Data Channel) Data
- HDMI3 EDID (DDC (Display Data Channel) Data
- Analog (RGB) EDID table
* See Working Guide if you want more information about EDID
communication.
- 15 -
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
0123456789ABCDEF
000FFFFFFFFFFFF001E6D010001010101
10 00 11 01 03 80 73 41 96 0A CF 74 A3 57 4C B0 23
20 09 48 4C AF CF 00 31 40 45 40 61 40 81 80 A9 40
30 01 01 01 01 01 01 66 21 50 B0 51 00 1B 30 40 70
40 36 00 C4 8E 21 00 00 1E 02 3A 80 18 71 38 2D 40
50 58 2C 45 00 C4 8E 21 00 00 1E 00 00 00 FD 00 30
60 58 1F 64 11 00 0A 20 20 20 20 20 20 00 00 00 FC
70 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 01 8A
0123456789ABCDEF
0020318F1478405030220221023150750
10 67 03 0C 00 10 00 B8 2D 01 1D 00 72 51 D0 1E 20
20 6E 28 55 00 C4 8E 21 00 00 1E 01 1D 80 18 71 1C
30 16 20 58 2C 25 00 C4 8E 21 00 00 9E 8C 0A D0 8A
40 20 E0 2D 10 10 3E 96 00 C4 8E 21 00 00 18 8C 0A
50 D0 8A 20 E0 2D 10 10 3E 96 00 13 8E 21 00 00 18
60 26 36 80 A0 70 38 1F 40 30 20 25 00 C4 8E 21 00
70 00 1A 00 00 00 00 00 00 00 00 00 00 00 00 00 27
0123456789ABCDEF
000FFFFFFFFFFFF001E6D010001010101
10 00 11 01 03 80 73 41 96 0A CF 74 A3 57 4C B0 23
20 09 48 4C AF CF 00 31 40 45 40 61 40 81 80 A9 40
30 01 01 01 01 01 01 66 21 50 B0 51 00 1B 30 40 70
40 36 00 C4 8E 21 00 00 1E 02 3A 80 18 71 38 2D 40
50 58 2C 45 00 C4 8E 21 00 00 1E 00 00 00 FD 00 30
60 58 1F 64 11 00 0A 20 20 20 20 20 20 00 00 00 FC
70 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 01 8A
0123456789ABCDEF
0020318F1478405030220221023150750
10 67 03 0C 00 30 00 B8 2D 01 1D 00 72 51 D0 1E 20
20 6E 28 55 00 C4 8E 21 00 00 1E 01 1D 80 18 71 1C
30 16 20 58 2C 25 00 C4 8E 21 00 00 9E 8C 0A D0 8A
40 20 E0 2D 10 10 3E 96 00 C4 8E 21 00 00 18 8C 0A
50 D0 8A 20 E0 2D 10 10 3E 96 00 13 8E 21 00 00 18
60 26 36 80 A0 70 38 1F 40 30 20 25 00 C4 8E 21 00
70 00 1A 00 00 00 00 00 00 00 00 00 00 00 00 00 07
0123456789ABCDEF
000FFFFFFFFFFFF001E6D010001010101
10 00 11 01 03 18 73 41 96 0A CF 74 A3 57 4C B0 23
20 09 48 4C AF CF 00 31 40 45 40 61 40 81 80 A9 40
30 01 01 01 01 01 01 66 21 50 B0 51 00 1B 30 40 70
40 36 00 C4 8E 21 00 00 1A 02 3A 80 18 71 38 2D 40
50 58 2C 45 00 C4 8E 21 00 00 1E 00 00 00 FD 00 30
60 58 1F 64 11 00 0A 20 20 20 20 20 20 00 00 00 FC
70 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 01 F6
0123456789ABCDEF
0 020304000E1F008051001E3040803700
10 C4 8E 21 00 00 1C F1 27 00 A0 51 00 25 30 50 80
20 37 00 C4 8E 21 00 00 1C 26 36 80 A0 70 38 1F 40
30 30 20 25 00 C4 8E 21 00 00 0A 00 00 00 00 00 00
40 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
50 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
60 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
70 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 BC
0123456789ABCDEF
000FFFFFFFFFFFF001E6D010001010101
10 00 11 01 03 80 73 41 96 0A CF 74 A3 57 4C B0 23
20 09 48 4C AF CF 00 31 40 45 40 61 40 81 80 A9 40
30 01 01 01 01 01 01 66 21 50 B0 51 00 1B 30 40 70
40 36 00 C4 8E 21 00 00 1E 02 3A 80 18 71 38 2D 40
50 58 2C 45 00 C4 8E 21 00 00 1E 00 00 00 FD 00 30
60 58 1F 64 11 00 0A 20 20 20 20 20 20 00 00 00 FC
70 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 01 8A
0123456789ABCDEF
0020318F1478405030220221023150750
10 67 03 0C 00 20 00 B8 2D 01 1D 00 72 51 D0 1E 20
20 6E 28 55 00 C4 8E 21 00 00 1E 01 1D 80 18 71 1C
30 16 20 58 2C 25 00 C4 8E 21 00 00 9E 8C 0A D0 8A
40 20 E0 2D 10 10 3E 96 00 C4 8E 21 00 00 18 8C 0A
50 D0 8A 20 E0 2D 10 10 3E 96 00 13 8E 21 00 00 18
60 26 36 80 A0 70 38 1F 40 30 20 25 00 C4 8E 21 00
70 00 1A 00 00 00 00 00 00 00 00 00 00 00 00 00 17

4.3 Adjustment Color Temperature(White
balance)
O Using Instruments
(1)Color Analyzer: CA-210 (CH 9)
- Using LCD color temperature, Color Analyzer (CA-210)
must use CH 9, which Matrix compensated (White,
Red, Green, Blue compensation) with CS-2100. See
the Coordination bellowed one.
(2) Auto-adjustment Equipment (It needs when Auto-
adjustment – It is availed communicate with RS-232C :
Baud rate: 115200)
(3) Video Signal Generator MSPG-925F 720p, 216Gray
(Model: 217, Pattern 78)
O Connection Diagram (Auto Adjustment)
(1) Using Inner Pattern
(2) Using HDMI input
O White Balance Adjustment
If you can’t adjust with inner pattern, then you can adjust it
using HDMI pattern. You can select option at "Ez-Adjust
Menu – White Balance" there items "NONE, INNER, HDMI".
It is normally setting at inner basically. If you can’t adjust
using inner pattern you can select HDMI item, and you can
adjust.
In manual Adjust case, if you press ADJ button of service
remocon, and enter "Ez-Adjust Menu – 7. White Balance",
then automatically inner pattern operates. (In case of "Inner"
originally "Inner" will be selected.
- Connect all cables and equipments like Pic.5)
- Set Baud Rate of RS-232C to 115200. It may set 115200
orignally.
- Connect RS-232C cable to set
- Connect HDMI cable to set
-Select LA75A Chassis at Adjustment equipment, and
adjust.
O RS-232C Command (Commonly apply)
- "wb 00 00": Start Auto-adjustment of white balance.
- "wb 00 10": Start Gain Adjustment (Inner pattern)
- "jb 00 c0" :
- …
- "wb 00 1f": End of Adjustment
* If it needs, offset adjustment (wb 00 20-start, wb 00 2f-
end)
- "wb 00 ff": End of white balance adjustment (inner pattern
disappear)
- 16 -
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
CA-100+
COLOR
ANALYZER
TYPE; CA-100+
Full W hitePattern
RS-232C
<Connection Diagram for Adjustment White balance>
RS-232C COMMAND
Meaning
[CMD ID DATA]
wb 00 00 White Balance adjustment start.
wb 00 10 Start of adjust gain (Inner white pattern)
wb 00 1f End of gain adjust
wb 00 20 Start of offset adjust(Inner white pattern)
wb 00 2f End of offset adjust
wb 00 ff
End of White Balance adjust(Inner pattern disappeared)

Notice) Adjustment Mapping information(Only 37/42LB5DF)
-When Color temperature (White balance) Adjustment
(Automatically)
(1) Press "Power only key" of service remocon and operate
automatically adjustment.
(2) Set BaudRate to 115200.
- You must start "wb 00 00" and finish it "wb 00 ff".
- If it needs, then adjustment "Offset
O White Balance Adjustment (Manual adjustment)
1) Test Equipment: CA-210
- Using LCD color temperature, Color Analyzer (CA-210)
must use CH 9, which Matrix compensated (White, Red,
Green, Blue compensation) with CS-2100. See the
Coordination bellowed one.
2) Manual adjustment sequence is like bellowed one.
- Turn to "Ez-Adjust" mode with press ADJ button of
service remocon.
- Select "10.Test Pattern" with CH+/- button and press
enter. Then set will go on Heat-run mode. Over 30
minutes set let on Heat-run mode.
- Let CA-210 to zero calibration and must has gap more
10cm from center of LCD module when adjustment.
- Press "ADJ" button of service remocon and select
"7.White-Balance" in "Ez-Adjust" then press " G" button
of navigation key.
(When press " G" button then set will go to full white
mode)
- Adjust at three mode (Cool, Medium, Warm)
- If "cool" mode (42LB5DF-UL, 37LB5DF-UL)
Let B-Gain to 192 and R, G, B-Cut to 64 and then
control R, G gain adjustment High Light adjustment.
-If "Medium" and "Warm" mode (42LB5DF-UL,
37LB5DF-UL)
Let R-Gain to 192 and R, G, B-Cut to 64 and then
control G, B gain adjustment High Light adjustment.
- All of the three mode (47LB5DF-UL, 47LC7DF-UK)
Let R-Gain to 192 and R, G, B-Cut to 64 and then
control G, B gain adjustment High Light adjustment.
- With volume button (+/-) you can adjust.
- After all adjustment finished, with Enter (Gkey) turn to
Ez-Adjust mode. Then with ADJ button, exit from
adjustment mode
=> Attachment : White Balance adjustment coordination and
color temperature.
O Using CS-1000 Equipment.
- COOL : T=11000K, ∆uv=0.000, x=0.276 y=0.283
- MEDIUM : T=9300K, ∆uv=0.000, x=0.285 y=0.293
- WARM : T=6500K, ∆uv=0.000, x=0.313 y=0.329
O Using CS-210 Equipment. (9 CH)
4.4 Test of RS-232C control.
Press In-Start button of Service Remocon then set the
"4.Baud Rate" to 115200. Then check RS-232C control and
4.5 Selection of Country option.
Selection of country option is allowed only North American
model (Not allowed Korean model). It is selection of Country
about Rating and Time Zone.
- Models: All models which use LA75A Chassis (See the first
page.)
- Press "In-Start" button of Service Remocon, then enter the
"Option" Menu with "PIP CH-" Button
-Select one of these three (USA, CANADA, MEXICO)
defends on its market using "Vol. +/-"button
- 17 -
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
RS-232C COMMAND CENTER
[CMD ID DATA] MIN (DEFAULT) MAX
Cool Mid
Warm Cool Mid Warm
R Gain jg ja jd 00 184 192 192 192
G Gain jh jb je 00 187 183 159 192
B Gain ji jc jf 00 192 161 95 192
R Cut 64 64 64 127
G Cut 64 64 64 127
B Cut 64 64 64 127
Color temperature Test Equipment
Color Coordination
xy
COOL CA-210 0.276±0.002 0.283±0.002
MEDIUM CA-210 0.285±0.002 0.293±0.002
WARM CA-210 0.313±0.002 0.329±0.002

Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
- 18 -
TROUBLESHOOTING
TV/CATV(Analog) doesn t display
Check TU801 Pin23(Video output)
Can you see the normal signal?
Check th e input(Pin1) of Low-Pass Filter
(IC808).
Can you see the normal waveform?
Check th e output(pin8) of Low-Pass
Filter(IC808).
Can you see the normal waveform?
Check the Capaciter(C658) in front of
BCM3553 chip.
Can you see the normal waveform?
YES
YES YES
NO Could you measure VCC voltage(5Pin) of TU801 & IIC
lines(8,9Pin)?
Are they all normal?
YES
You should rep lace TUNER.
NO After checking the C800(0.1uF Cap), you can
suspect that PCB is bad.
NO After checking the Power of Low-Pass Filter you
should decide to replace Low -Pass Filter or not.
NO After checking the pattern between pin8 of IC808
and C658, you can suspect th at PCB is bad ..
YES This board has big problem because Main
chip(BCM3550) have some trouble s.
After checking thoro ughly all path once again,
You should decid e to replace BCM3553 or not.

Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
- 19 -
Video doesn t display
Check JP7004.
Can you see the normal waveform?
Check th e Low-pass Filter(L703).
Can you see the normal waveform?
YES
YES
NO JK701 may have problem. Replace this
Jack.
Check the C651 in front of BCM3553 chip.
Can you see the normal waveform?
NO replace Part(L 703).
YES This board has big problem because Main
chip(BCM3553) have some trouble s.
After checking thoro ughly all path once again,
You should decid e to replace BCM3553 or not.
NO After check the pattern between L703 and C651,
You can suspect that PCB is bad.

Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
- 20 -
Component doesn t display
Check JP7001,J7015.
Can you see the normal waveform?
Check th e L700, L704.
Can you see the normal waveform?
Check th e C638, C628 in front of BCM3553.
Can you see the normal waveform?
YES
YES
NO JK700, JK702 may have problem. Replace this
Jack.
NO Replace the Part (L700, L704) NO After check the pattern between L703 and C651,
You can suspect that PCB is bad.
YES This board has big problem because Main
chip(BCM3553) have some trouble s.
After checking thoro ughly all path once again,
You should decide to replace BCM3553 or not.