LG 42LY99 User manual

LCD TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : LD75C
MODEL : 42LY99 42LY99-ZC
website:http://biz.LGservice.com
Internal Use Only
All manuals and user guides at all-guides.com
all-guides.com

- 2 - LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
CONTENTS
CONTENTS .............................................................................................. 2
PRODUCT SAFETY ..................................................................................3
SPECIFICATION ........................................................................................6
ADJUSTMENT INSTRUCTION ...............................................................10
TROUBLE SHOOTING ............................................................................14
BLOCK DIAGRAM...................................................................................21
EXPLODED VIEW .................................................................................. 22
REPLACEMENT PARTS LIST ............................................................... 24
SVC. SHEET ...............................................................................................
All manuals and user guides at all-guides.com

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 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
All manuals and user guides at all-guides.com

- 4 - LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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
All manuals and user guides at all-guides.com

- 5 - LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
IC Remove/Replacement
Some chassis circuit boards have slotted holes (oblong) through
which the IC leads are inserted and then bent 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.
All manuals and user guides at all-guides.com

- 6 - LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement .
2. MODEL Gereral Specification
No Item Specification Remark
1. Market UK, German, Italy, France, Sweden, Finland, Analog only
Spain, Netherlands, Belgium, Luxemburg, Greece,
Denmark, Czech, Austria, Rumania, Poland,
Portugal, Norway, Rumania, Hungary, Bulgaria,
Croatia, Serbia, Swiss, Slovenia, Russia
2. Broadcasting system 1) PAL-BG / I /I’/DK
2) SECAM L/L’
3) DVB-T
3. Receiving system Analog : Upper Heterodyne
Digital : COFDM
4. Scart Jack (2EA) PAL, SECAM Scart 2 Jack : MNT / DTV output
5. Video Input (1EA) PAL, SECAM, NTSC 4 System : PAL, SECAM, NTSC, PAL60
6. S-Video Input (1EA) PAL, SECAM, NTSC 4 System : PAL, SECAM, NTSC, PAL60
7. Component Input (1EA) Y/Cb/Cr, Y/Pb/Pr
8. RGB Input (1EA) RGB-PC
9. HDMI Input (3 EA) HDMI-DTV & SOUND
10. Audio Input (3 EA) PC Audio, Component, AV L/R Input
1. General Specification (LCD MODULE)
No Item Specification Remark
1. Display Screen Device 42inch Full-HD 100Hz(WCG) LCD
2. Aspect Ratio 16:9
3. LCD Module 42LY99(LC420WU4-SLA2)
4. Operating Environment 1) Temp. : 0 ~ 40 deg
2) Humidity : 10 ~ 90% LGE SPEC
5. Storage Environment 3) Temp. : -20 ~ 50 deg
4) Humidity : 10 ~ 90 %
6. Input Voltage 100 - 240V~, 50/60Hz
All manuals and user guides at all-guides.com
all-guides.com

- 7 - LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. Chroma & Brightness (LCD Module)
4. Component Video Input (Y, PB, PR)
No Resolution H-freq(kHz) V-freq(Hz) Pixel clock(MHz) Proposed
1 720*480 15.73 59.94 13.500 SDTV, DVD 480I(525I)
2 720*480 15.75 60.00 13.514 SDTV, DVD 480I(525I)
3 720*576 15.625 50.00 13.500 SDTV, DVD 576I(625I)
4 720*480 31.47 59.94 27.000 SDTV 480P
5 720*480 31.50 60.00 27.027 SDTV 480P
6 720*576 31.25 50.00 27.000 SDTV 576P
7 1280*720 44.96 59.94 74.176 HDTV 720P
8 1280*720 45.00 60.00 74.250 HDTV 720P
9 1280*720 37.50 50.00 74.25 HDTV 720P
10 1920*1080 33.72 59.94 74.176 HDTV 1080I
11 1920*1080 33.75 60.00 74.250 HDTV 1080I
12 1920*1080 28.125 50.00 74.250 HDTV 1080I
13 1920*1080 67.50 60.00 148.50 HDTV 1080P
No Item Min. Typ. Max Unit Remark
1 Viewing Angle<CR>10> R/L 178
U/D 178
2. White average brightness 400 500 - cd/m - 100IRE Full White Pattern (255 gray)
- Picture : Dynamic (Cool)
3. Brightness uniformity 1.3 cd/m - 100IRE Full White Pattern (255 gray)
- Picture : Dynamic (Cool)
4. Color Coordinate White X Typ 0.279 Typ - 85IRE Full White Pattern (216 gray)
Y -0.03 0.292 +0.03 - Picture : Dynamic (Cool)
Red X 0.663
Y 0.324
Green X 0.194
Y 0.659
Blue X 0.141
Y 0.082
5. Color coordinate uniformity -0.03 Average +0.03 - 85IRE Full White Pattern (216 gray)
- Picture : Dynamic (Cool)
6. Contrast Ratio CR with 7000 : 1 10000 :1 - Full white(100IRE)
at dark room PWM-Dimming - Full black(0IRE) pattern
CR without 7000 : 1 10000 :1 - Picture : Dynamic (Cool)
PWM-Dimming - Input : TV/DTV/AV1,2,3/Comp/HDMI1,2
-> CR with PWM-Dimming
RGB/HDMI-PC
-> CR without PWM-Dimming
All manuals and user guides at all-guides.com

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 8 -
5. RGB PC INPUT (PC)
No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed Remarks
1. 720*400 31.468 70.08 28.32
2. 640*480 31.469 59.94 25.17 VESA 848*480 60Hz, 852*480 60Hz
37.500 75.00 31.50 -> Display 640*480 60H
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)
56.476 70.00 75.00
60.023 75.03 78.75
6 1280*768 47.693 59.99 80.125 WXGA
7 1360*768 47.649 59.94 84.625 WXGA
8 1366*768 47.649 59.94 84.625 WXGA
9 1280*1024 63.595 60.0 108.875 SXGA
10 1400*1050 65.160 60.0 122.50 SXGA
11 1920*1080 66.647 59.988 138.625 WUXGA Reduced Blanking Timing
6. HDMI input (DTV)
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 -> Display 640*480
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 ->
10. 1280*720 45.00 60.00 74.250 HDTV 720P Display 1280*768 60Hz
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 ->
17 1920*1080 67.500 60 148.500 HDTV 1080P Display 1920*1080 60Hz
All manuals and user guides at all-guides.com

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 9 -
No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed Remarks
1. 720*400 31.468 70.08 28.32
2. 640*480 31.469 59.94 25.17 VESA DTV mode -> Display 480p
37.500 75.00 31.50 848*480 60Hz, 852*480 60Hz
:Display No signal
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 Mcintosh
5 1024*768 48.363 60.00 65.00 VESA(XGA)
56.476 70.00 75.00
60.023 75.03 78.75
6 1280*768 47.693 59.99 80.125 WXGA
7 1360*768 47.649 59.94 84.625 WXGA
8 1366*768 47.649 59.94 84.625 WXGA
9 1280*1024 63.595 60.0 108.875 SXGA
10 1400*1050 65.160 60.0 122.50 SXGA
11 1600*1200 74.077 60.0 130.375 UXGA Reduced Blanking Timing
Input 1920*1200 60Hz ->No Signal
12 1920*1080 66.647 59.988 138.625 WUXGA Reduced Blanking Timing
DTV mode -> 1080P Display
7. HDMI input (PC)
All manuals and user guides at all-guides.com

- 10 - LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
ADJUSTMENT INSTRUCTION
1. Application Range
This spec. sheet is applied to all of the LD75C chassis
manufactured at LG TV Plant all over the world.
2. Specification.
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) Adjustment must be done in the correct sequence.
3) The adjustment must be performed at 25±5°C temperature
and 65±10% relative humidity if there is no specified
designation.
4) The input voltage of the receiver must be kept between
100-220V~, 50/60Hz.
5) Before adjustment, execute Heat-Run for 30 minutes at RF
no signal.
3. Channel Memory
1) Press ADJ key in Adjust remote control.
2) Select “System Control 3” by using D/E(CH+/-) key, and
press A(ENTER).
3) Select “Channel Recover” by using D/E(CH+/-) key, and
press G(VOL+).
4) When Channel Recover is completed, set will be turned off
and LED light og to stand-by model.
Tool option 1 and 2 are fixed. So, you need not chaange
these munbers.
4. ADC Calibration
- This process should be done at insert process. If ADC Cal. is
not done at whole assembly line , you should do this
process again.
<Caution>
- System control RS-232 Host should be “PC” for adjustment.
- Before AV ADC Calibration, execute the “Module selection”.
4.1. Adjustment of RF/AV/S-VIDEO
(1) 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
(2) Method of Auto RF/AV/S-VIDEO Color Balance.
1) Input the Video Signal: 7 Color Bar signal into AV3.
2) Set the PSM to Dynamic mode in the Picture menu.
3) Press IN-START 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.
(1) Required Equipments
- Remote controller for adjustment
- MSPG-925FS Pattern Generator (Which has 720p/60Hz
YPbPr output Pattern shown in Fig. 1 )
=> Model:215/Pattern: 65
(2) 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
3) Press the IN-START 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.
Model Name Tool option 1 Tool option 2 Maker Inch Tool
42LY99 228087 1733 WCG 42 LY99
ADC RF/AV/S-VIDEO Component RGB-PC
MSPG925FS PALJ Model:215 (720P) Model: 3
INPUT SELECT AV3 Pattern:65 (1024*768 60Hz)
Model: 202 (PAL-BGDHI) 720P/50Hz Pattern: 65
Pattern: 65 7 Color Bar
PAL 7 Color Bar
<Fig. 1>
All manuals and user guides at all-guides.com

- 11 - LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4.3 Adjustment of RGB
(1) Required Equipments
- Remote controller for adjustment
- MSPG-925F Pattern Generator
(Which has XGA [1024*768] 60Hz 8 Color Bar 100%
pattern shown in Fig. 1)
(2) Method of Auto RGB Color Balance
1) Input the PC 1024x768@60Hz 100% Color Bar pattern
(MSPG-925F model:37, pattern:33) 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
4) Press the G(Vol.+) key operate To set , then it becomes
automatically.
5) Auto-RGB OK means adjustment is completed.
5. EDID
* Caution
1) Use the proper signal cable for EDID Download
- Analog EDID : Pin3 exists
- Digital EDID : Pin3 exists
2) Never connect HDMI & D-sub Cable at the same time.
3) Use the proper cables below for EDID Writing.
4) Download HDMI1, HDMI2, HDMI3 separately because
HDMI1 is different from HDMI2, HDMI3.
5.1. EDID Data
5.2. Data
(1) ANALOG (128 bytes)
(2) HDMI 1 (256 bytes)=>
(3) HDMI 2 (256 bytes)
(4) HDMI 3 (256 bytes)
-> Detail EDID Options are below (a, b, c, d, e-1, e-2, f-1)
(a) Product ID
(b) Serial No: Controlled on production line.
(c) Month, Year: Controlled on production line:
ex) Monthly : ‘09’ -> ‘09’
Year : ‘2006’ -> ‘10’
(d) Model Name(Hex): 42LY99 ->
000000FC0034323C5939390A202020202020
(e-1, e-2, f-1, f-2) Checksum: Changeable by total EDID data.
Item
Manufacurer ID
Version
Revision
Condition
GSM
Digital : 1
Digital : 3
Data(Hex)
1E6D
01
03
D-sub to D-sub DVI-D to HDMI or HDMI ro HDMI
For HDMI EDIDFor Analog EDID
0x000x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0A 0x0B 0x0C0x0D 0x0E 0x0F
0x00 0 FF FF FF FF FF FF 0 1E 6D
0x01 01 03 01 46 27 78 EA D9 B0 A3 57 49 9C 25
0x02 11 49 4B A5 6E 0 31 40 45 40 61 40 81 80 90 40
0x03 D1 C0 01 01 01 01 1A 36 80 A0 70 38 1F 40 30 20
0x04 35 00 E8 26 32 00 00 1A DA 2F 78 E0 51 1A 25 40
0x05 59 98 14 00 E8 26 32 00 00 1A 00 00 00 FD 00 39
0x06 4B 1F 54 12 00 0A 20 20 20 20 20 20
0x07 -1
0x000x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0A 0x0B 0x0C0x0D 0x0E 0x0F
0x00 00 FF FF FF FF FF FF 00 1E 6D 01 01 01 01
0x10 01 03 80 46 27 78 EA D9 B0 A3 57 49 9C 25
0x20 11 49 4B A5 6E 00 31 40 45 40 61 40 81 80 90 40
0x30 A9 40 D1 C0 01 01 1A 36 80 A0 70 38 1F 40 30 20
0x40 35 00 E8 26 32 00 00 1A 1B 21 50 A0 51 00 1E 30
0x50 48 88 35 00 BC 86 21 00 00 1C 00 00 00 FD 00 39
0x60 4B 1F 54 12 00 0A 20 20 20 20 20 20
0x70 01 -2
0x80 02 03 21 F1 4E 81 02 03 15 12 13 04 14 05 20 21
0x90 22 1F 10 23 09 07 07 83 01 00 00 65 03 0C 00 10
0xA0 00 01 1D 00 80 51 D0 1C 20 40 80 35 00 BC 88 21
0xB0 00 00 1E 8C 0A D0 8A 20 E0 2D 10 10 3E 96 00 13
0xC0 8E 21 00 00 18 2 3A 80 18 71 38 2D 40 58 2C 45
0xD0 00 06 44 21 00 00 1E 01 1D 80 18 71 1C 16 20 58
0xE0 2C 25 00 C4 8E 21 00 00 9E 4E 1F 00 80 51 00 1E
0xF0 30 40 80 37 00 BC 88 21 00 00 18 00 00 00 00 -1
0x000x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0A 0x0B 0x0C0x0D 0x0E 0x0F
0x00 00 FF FF FF FF FF FF 00 1E 6D
0x10 01 03 80 46 27 78 EA D9 B0 A3 57 49 9C 25
0x20 11 49 4B A5 6E 00 31 40 45 40 61 40 81 80 90 40
0x30 A9 40 D1 C0 01 01 1A 36 80 A0 70 38 1F 40 30 20
0x40 35 00 E8 26 32 00 00 1A 1B 21 50 A0 51 00 1E 30
0x50 48 88 35 00 BC 86 21 00 00 1C 00 00 00 FD 00 39
0x60 4B 1F 54 12 00 0A 20 20 20 20 20 20
0x70 01 -2
0x80 02 03 21 F1 4E 81 02 03 15 12 13 04 14 05 20 21
0x90 22 1F 10 23 09 07 07 83 01 00 00 65 03 0C 00 20
0xA0 00 01 1D 00 80 51 D0 1C 20 40 80 35 00 BC 88 21
0xB0 00 00 1E 8C 0A D0 8A 20 E0 2D 10 10 3E 96 00 13
0xC0 8E 21 00 00 18 02 3A 80 18 71 38 2D 40 58 2C 45
0xD0 00 06 44 21 00 00 1E 01 1D 80 18 71 1C 16 20 58
0xE0 2C 25 00 C4 8E 21 00 00 9E 4E 1F 00 80 51 00 1E
0xF0 30 40 80 37 00 BC 88 21 00 00 18 00 00 00 00 -1
0x000x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0A 0x0B 0x0C0x0D 0x0E 0x0F
0x00 00 FF FF FF FF FF FF 00 1E 6D
0x10 01 03 80 46 27 78 EA D9 B0 A3 57 49 9C 25
0x20 11 49 4B A5 6E 00 31 40 45 40 61 40 81 80 90 40
0x30 A9 40 D1 C0 01 01 1A 36 80 A0 70 38 1F 40 30 20
0x40 35 00 E8 26 32 00 00 1A 1B 21 50 A0 51 00 1E 30
0x50 48 88 35 00 BC 86 21 00 00 1C 00 00 00 FD 00 39
0x60 4B 1F 54 12 00 0A 20 20 20 20 20 20
0x70 01 -2
0x80 02 03 21 F1 4E 81 02 03 15 12 13 04 14 05 20 21
0x90 22 1F 10 23 09 07 07 83 01 00 00 65 03 0C 00 30
0xA0 00 01 1D 00 80 51 D0 1C 20 40 80 35 00 BC 88 21
0xB0 00 00 1E 8C 0A D0 8A 20 E0 2D 10 10 3E 96 00 13
0xC0 8E 21 00 00 18 02 3A 80 18 71 38 2D 40 58 2C 45
0xD0 00 06 44 21 00 00 1E 01 1D 80 18 71 1C 16 20 58
0xE0 2C 25 00 C4 8E 21 00 00 9E 4E 1F 00 80 51 00 1E
0xF0 30 40 80 37 00 BC 88 21 00 00 18 00 00 00 00 -1
All manuals and user guides at all-guides.com
all-guides.com

- 12 -
* Before White-balance, the AV ADC should be done.
6. White Balance
* Test Equipment
Color Analyzer (42LY99-ZC use WCG Panel. If you use CA-
210, CH.12 should be selected)
: When you adjust LCD color temperature on Color analyzer
(CA-210), you should use Channel 9 in NCG Module and
Channel 12 in WCG. Matrix compensated (White, Red,
Green, Blue revised) by CS-1000 and can be helped in
accordance with White balance adjustment coordinate which
is specified on the next.
* Color temperature standards according to CSM and Module
Cool : 11,000k
Medium : 9,300k
Warm : 6,500k
* White balance adjustment coordinate and color temperature
- PC (for communication through RS-232C)
-> UART Baud rate : 115200 bps
- Luminance Y AV : upper 200 cd/m2≥(Typ : 350 cd/m2)
-> Applying to Cool
* 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 12)
- Auto adjustment Map (RS-232C)
* 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) Adhere closely the Color Analyzer (CA-210) 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.
- Using ‘no signal’ or ‘full white pattern’ or the others,
check the back light on.
LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
CS-1000 CA-210(CH 9) CA-100+(CH9)
Cool
x 0.276±0.002 0.276±0.002 0.276±0.002
y 0.283±0.002 0.283±0.002 0.283±0.002
Temp. 11000 11000 11000
Δuv 0.000 0.000 0.000
Medium
x 0.285±0.002 0.285±0.002 0.285±0.002
y 0.293±0.002 0.293±0.002 0.293±0.002
Temp. 9300 9300 9300
Δuv 0.000 0.000 0.000
Warm
x 0.313±0.002 0.313±0.002 0.313±0.002
y 0.329±0.002 0.329±0.002 0.329±0.002
Temp. 6500 6500 6500
Δuv 0.003 0.003 0.003
<Fig. 2> Connecting picture (On Automatic Control)
Type LD73C
Baud Rate Data bit Stop bit Parity
115200 8 1 None
Index Cmd 1 Cmd 2 Data Min Value Max Value
R-Gain_Normal j a 00(00) 128(80)
G-Gain_Normal j b 00(00) 128(80)
B-Gain_Normal j c 00(00) 128(80)
R-Gain_Warm j d 00(00) 128(80)
G-Gain_Warm j e 00(00) 128(80)
B-Gain_Warm j f 00(00) 128(80)
R-Gain_Cool j g 00(00) 128(80)
G-Gain_Cool j h 00(00) 128(80)
B-Gain_Cool j i 00(00) 128(80)
R-Offset_Normal l j 00(00) 128(80)
G-Offset_Normal l k 00(00) 128(80)
B-Offset_Normal l l 00(00) 128(80)
R-Offset_Warm l m 00(00) 128(80)
G-Offset_Warm l n 00(00) 128(80)
B-Offset_Warm l o 00(00) 128(80)
R-Offset_Cool l p 00(00) 128(80)
G-Offset_Cool l q 00(00) 128(80)
B-Offset_Cool l r 00(00) 128(80)
Internal Pattern signal w b 00 Starting W/B ADJ
Internal Pattern signal w b 10 Using internal Pattern
Internal Pattern signal w b ff Ending W/B ADJ
All manuals and user guides at all-guides.com

- 13 -
6.1. Auto white Balance
(Set:RS-232, Host:PC, Baud Rate:115200bps, Download:Cortez)
Inside pattern is used when balance is controlled.
Connect as below figure and click the start button on W/B
execution program.
W/B is automatically processing Cool --> Medium --> Warm in
order.
When W/B is completed, you can see ‘OK’ on PC monitor.
6.2. 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 G, and heat run over 15 minutes. (Set : RS-233
Host : PC, Baud Rate : 115200bps, Download : Cortez)
2) Zero Calibrate CA-210, 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 80.
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)
7. Set information(Serial No & Model name)
(1) Setting up like bottom figure (After setting white balance,
this is set)
1) Press ADJ Key in the Adjust remocon.
2) Select “System Control 2” by using D/E(CH+/-) key,
and press A(ENTER).
3) Using Adjust remocon, RS-232 Host & Baud Rate &
Download value change (RS-232 Host : PC, Baud
Rate:115200bps, Download:Cortez)
(2) Bar-code scanning
1) Push the menu button in DTV mode.
Select the STATION -> Diagnostics -> To set
2) Check the Serial Number.
LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
All manuals and user guides at all-guides.com

- 14 - LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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 following
Plug in the power cord.
No
Yes
Is the power cord
pluged in?
Connect the cable.
No
Is the Line Filter
and Power Board Cable
connected?
Replace the fuse.
No
Is the appropriate
Fuse(F101) on Power
Board?
Connect the Cable.
After removing the cables, connect them to the
Power Board (except the SC101 connection
cable), and change the AC voltage marking to
manual.
When ST-BY 5V does not operate, replace the
Power Board.
No
Is the
Power Board and 13P
of VSC Board Cable
connected?
Yes
Yes
Yes
All manuals and user guides at all-guides.com

- 15 - LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
2. Protect mode
(1) Symptom
1) After lighting up once, it does not discharge minutely from module.
2) The relay falls.(There is an audible “click”.)
3) The color of the front LED turns from green to red.
(2) Check following
Is the Power
Board normal? Replace the Power Board.
Is the output the normality Low/High
voltage except Stand-by 5V?
Yes
No No
Is the
each connector
normal?
Replace the connector.
After connecting each connector do
they operate normally?
Yes
No No
Is the VSC Board
normal?
If it operates normally after
removing the P900, P901
: Replace VSC Board
Is the output voltage normal after
removing P900, P901 of VSC Board?
No Yes
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 following
Does
minute discharge
at Module?
Is output the normality
Low/High voltage except
stand-by 5V?
Is the inverter on?
Check the LCD Module.
Yes
No
Yes
Replace the Power
board.
No
No
Is the LVDS
cable normal? Reconnect the LVDS cable in P800.
Yes
No
Is the IC700
(FLI8548) Output
normal?
Replace the VSC.
No
All manuals and user guides at all-guides.com

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

- 17 - LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4-2. In case of does't display the screen into specific mode
(1) Symptom
- There is no screen display from specific input mode.
(RF, AV, Component, RGB, DVI).
(2) Check following
1) Check the all input modes have normal display.
2) Check the Video(Main)/Data(Sub), Video(Main)/Video(Sub) have normal display from
the PIP mode or DW mode. (Re-Check it Swap)
(3) In case of becomes unusual display from RF mode
Is the Tuner
normal?
Is the Input voltage, IIC Communication
and CVBS output normal?
Replace the Tuner.
Is the Tuner Cable
connected?
Re- inserts the cable.
Yes
No
No No
Yes
Is the CXA2069Q
normal?
Replace the IC.
Is the Input voltage, IIC Communication
and HV sync normal?
Yes
No No
Replace the IC.
No
Is the FIL8548
normal?
Is the Input voltage, IIC Communication
and HV sync normal?
No
Block A
All manuals and user guides at all-guides.com

- 18 - LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
(4) In the case of becomes unusual display from side S-video/AV mode
Is Videoinput
of the AVJack(P1400)
normal?
Check the input source.
Are the Input voltage, IIC Communication
and HV sync normal?
Yes
No
No Replace the IC.
No
Replace the IC.
No
Is the CXA2069Q
normal?
Yes
Same as Block A.
(5) In the case of becomes unusual display from Component, RGB mode
Are the
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 the
HDMI002 (IC1004)
normal?
Yes
Is the Input voltage, IIC Communication
and HV sync normal?
No
Same as Block A.
All manuals and user guides at all-guides.com

- 19 - LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
(7) In the case of becomes unusual display from SCART1 mode
Is Video input
of the A/V jack(J1200)
normal?
Yes
Check the input source.
No
Same as Block A.
(8) In the case of becomes unusual display from SCART2 mode
Is Video input
of the A/V jack(J1201)
normal?
Yes
Check the input source.
No
Same as Block A.
All manuals and user guides at all-guides.com

- 20 - LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
5. In case of no sound
(1) Symptom
1) LED is green.
2) Screen display appears but there is no sound.
(2) Check follow
is there no
sound for all input
(modes)?
Is the speaker on? Set on speaker in
menu.
Is the speaker
Cable normal?
Check the Speaker
Cable.
Is the IC1300
operating normally?
Replace IC1300
(MSP4450)
Is the IC1301
operation normally?
Replace IC1300
(STA335BW)
Replace VSC B/D.
Yes
No
Is there no sound
only for HDMI?
Yes
Download the EDID data.
No
No
No
No
No
Only RF is
no sound?
Yes
Check the Tuner IN/OUT
No
Check the signal before
CXA2069 refer to circuit diagram
Is there
no sound only for
AV/ Component/ PC
input?
Yes
Is there
no sound only for
specific input? (except
HDMI,DTV,RF)
Yes
Is the output of
CXA2069 normal?
Check the signal after CXA2069
refer to circuit diagram.
No
Replace CXA2069
No
Yes
Yes
Yes
Yes
No
All manuals and user guides at all-guides.com