LG 37LG5500 User manual

LCD TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : LD82D
MODEL : 37LG5500 37LG5500-ZB
website:http://biz.LGservice.com
Internal Use Only

Copyright LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
C2008
- 2 -
CONTENTS
CONTENTS .............................................................................................. 2
PRODUCT SAFETY ..................................................................................3
SPECIFICATION........................................................................................6
ADJUSTMENT INSTRUCTION ...............................................................10
TROUBLE SHOOTING............................................................................15
BLOCK DIAGRAM...................................................................................22
EXPLODED VIEW .................................................................................. 24
SVC. SHEET ...............................................................................................

Copyright LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
C2008
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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

Copyright LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
C2008
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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 circuit
board printed foil.
6. Use the following soldering technique.
a. Allow the soldering iron tip to reach a normal temperature
(500°F to 600°F)
b. First, hold the soldering iron tip and solder the strand against
the component lead until the solder melts.
c. Quickly move the soldering iron tip to the junction of the
component lead and the printed circuit foil, and hold it there
only until the solder flows onto and around both the
component lead and the foil.
CAUTION: Work quickly to avoid overheating the circuit
board printed foil.
d. Closely inspect the solder area and remove any excess or
splashed solder with a small wire-bristle brush.
SERVICING PRECAUTIONS

Copyright LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
C2008
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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 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
C2008
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SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement .
1. General Specification(TV)
No Item Specification Remark
1. Video input applicable system PAL-D/K, B/G, I, SECAM
2. Receivable Broadcasting System 1) PAL/SECAM BG EU(PAL Market)
2) PAL/SECAM DK
3) PAL I/I
4) SECAM L/L'
5) DVB-T
3. RF Input Channel VHF : E2 ~ E12 PAL
UHF : E21 ~ E69
CATV : S1 ~ S20
HYPER : S21~ S47
4. Input Voltage 100 - 240V~ / 50Hz, 60Hz
5. Market France
6. Picture Size 37 inch 37LG5500
7. Tuning System FVS 100 program PAL, 200 PR.(Option)
8. Operating Environment 1) Temp : 0 ~ 40 deg
2) Humidity : 10~90 %
9. Storage Environment 3) Temp : -20 ~ 50 deg
4) Humidity : 10~90 %
10. Display LCD Module LPL
2. Model Specification
Item Specification Remark
Market France
Broadcasting system PAL BG/I/DK, SECAM L/L’, DVB-T
Receiving system Analog : Upper Heterodyne
Digital : COFDM
Scart Jack (2EA) PAL, SECAM
Video Input RCA(1EA) PAL, SECAM, NTSC 4 System : PAL, SECAM, NTSC, PAL60
S-Video Input (1EA) PAL, SECAM, NTSC 4 System : PAL, SECAM, NTSC, PAL60
Component Input(1EA) Y/Cb/Cr, Y/ Pb/Pr
RGB PC Input(1EA) RGB-PC Analog (D-SUB 15PIN)
HDMI Input(3EA) HDMI1(DTV)/DVI, HDMI2/3(DTV) HDMI ver 1.3, (Simplink HDMI1/2 Only)
Audio Input(3EA) RGB/DVI Audio, Component, AV L/R Input
SPDIF out(1EA) SPDIF out

- 7 -
Copyright LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
C2008
3. General Specification(LCD Module - LC370WU1-SL01)
No Item Min. Typ. Max. Unit Remark
1 Display area 819.36 (H) x 460.89 (V) mm
2 Outline dimension 877 (W) x 516.8 (H) x 55.5 (D) mm
(Typ. Without inverter)
3 Number of Pixels 1920 (H) x 1080(V) 1Pixel=3RGB Cells
4 Cell pitch 426.75um (H) x 426.75um (V) µm Standard : G cell
5 Color arrangement RGB stripe arrangement
6 Coating Hard coating(3H), Anti-glare
7 Operating Environment Temperature 0 ~ 40 deg Altitude - 0 to 1400feet
Humidity 10 ~ 90 %
8 Storage Environment Temperature -20 ~ 50 deg Altitude - 0 to 4000feet
Humidity 10 ~ 90 %
9 Back Light 20EEFL
4. Optical Feature(LCD Module - LC370WU1-SL01)
No Item Specification Min. Typ. Max. Remark
1 Viewing Angle [CR>10] R/L, U/D 178, 178
2 Luminance Luminance(cd/m2) 400 500
-100IRE Full White pattern(255gray)
Variation 1.3 MAX/MIN
3 Contrast Ratio CRD(37”) 400 5000 - Full white(100IRE)
- Full black(0IRE)
- Picture : Dynamic(Cool)
- Input : TV/DTV/AV1,2,3/Comp
/HDMI1,2,3
- CR without PWM Dimming
CR(37”) 400 600 RGB/HDMI-PC-CR with PWM
Dimming
4 CIE Color Coordinates White Wx -0.03 0.276 +0.03 - 85IRE Full White pattern
Wy -0.03 0.283 +0.03 (216 gray)
Red Xr -0.03 0.618 +0.03 - Picture : Dynamic (Cool)
Yr -0.03 0.333 +0.03
Green Xg -0.03 0.275 +0.03
Yg -0.03 0.610 +0.03
Blue Xb -0.03 0.147 +0.03
Yb -0.03 0.061 +0.03

Copyright LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
C2008
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8. RGB PC INPUT Mode Table
No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed
1. 720x400 31.468 70.08 28.321 VESA
2. 640x480 31.469 59.94 25.17
37.500 75.00 31.50
3. 800x600 37.879 60.31 40.00 VESA
46.875 75.00 49.50
4. 832x624 49.725 74.55 57.283
5. 1024x768 48.363 60.00 65.00 VESA(XGA)
56.476 70.00 75.00
60.023 75.03 78.75
6. 1280x768 47.693 59.99 80.125 VESA(WXGA)
7. 1360x768 47.649 59.94 84.625 VESA(WXGA)
8. 1366x768 47.649 59.94 84.625 Supported
9. 1280x1024 63.595 60.00 108.875 SXGA
10. 1400x1050 65.150 60.00 122.50 SXGA
11. 1920x1080 66.647 59.988 138.625 WUXGA
7. Component Video Input (Y, PB, PR)
No Specification Proposed
Resolution H-freq(kHz) V-freq(Hz)
1 720x480 15.73 59.94 SDTV, DVD 480i
2 720x480 15.75 60 SDTV, DVD 480i
3 720x480 31.47 59.94 SDTV 480p
4 720X480 31.5 60 SDTV 480p
5 720x576 15.625 50 SDTV, DVD 576i
6 720x576 31.25 50 SDTV 576p
7 1280x720 44.96 59.94 HDTV 720p
8 1280x720 45 60 HDTV 720p
9 1280x720 37.5 50 HDTV 720p
10 1920x1080 28.125 50 HDTV 1080i
11 1920x1080 33.75 60 HDTV 1080i
12 1920x1080 33.72 59.94 HDTV 1080i
13 1920x1080 27 24 HDTV 1080p
14 1920x1080 33.75 30 HDTV 1080p
15 1920x1080 56.25 50 HDTV 1080p
16 1920x1080 67.433 59.94 HDTV 1080p
17 1920x1080 67.5 60 HDTV 1080p

Copyright LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
C2008
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No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed
1. 720x400 31.468 70.08 28.32
2. 640x480 31.469 59.94 25.17
37.500 75.00 31.50 VESA
3. 800x600 37.879 60.31 40.00
46.875 75.00 49.50 VESA
4. 832x624 49.725 74.55 57.283 Macintosh
5. 1024x768 48.363 60.00 65.00
56.476 70.00 75.00
60.023 75.03 78.75 VESA(XGA)
6. 1280x768 47.693 59.99 80.125 VESA(WXGA)
7. 1360x768 47.649 59.94 84.625 VESA(WXGA)
8. 1366x768 47.649 59.94 84.625 Supported
9. 1280x1024 63.595 60.0 108.875 SXGA
10. 1400x1050 65.160 60.0 122.50 SXGA
11. 1600x1200 74.077 60.0 130.375 UXGA
12. 1920x1080 66.647 59.988 138.625 WUXGA
10. HDMI PC Table
9. HDMI DTV Table
No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Remark Proposed
1 640x480 31.469 59.94 25.175 SDTV 480p 60Hz PC mode ->
2 640x480 31.469 60 25.2 SDTV 480p 60Hz Display 640*480
3 720x480 31.47 59.94 27 SDTV 480p 60Hz
4 720x480 31.5 60 27.027 SDTV 480p 60Hz
5 720x576 31.25 50 27 SDTV 576p 50Hz
6 1280x720 37.5 50 74.176 HDTV 720p 50Hz HDCP
7 1280x720 44.96 59.94 74.176 HDTV 720p 60Hz HDCP
8 1280x720 45 60 74.25 HDTV 720p 60Hz HDCP
9 1920x1080 28.125 50 74.25 HDTV 1080i 50Hz HDCP
10 1920x1080 33.72 59.94 74.176 HDTV 1080i 60Hz HDCP
11 1920x1080 33.75 60 74.25 HDTV 1080i 60Hz HDCP
12 1920x1080 27 24 74.25 HDTV 1080P 24Hz HDCP
13 1920x1080 33.75 30 74.25 HDTV 1080P 30Hz HDCP
14 1920x1080 56.25 50 148.5 HDTV 1080P 50Hz HDCP
15 1920x1080 67.433 59.94 148.352 HDTV 1080P 60Hz HDCP
16 1920x1080 67.5 60 148.5 HDTV 1080P 60Hz HDCP

Copyright LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
C2008
- 10 -
ADJUSTMENT INSTRUCTION
1. Application Range
This spec. sheet is applied to all of the LD82D 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
3.1. Channel memory method
1) Press ADJ key in Adjust remote control.
2) Select “Channel Recover” by using D/E(CH+/-) key, and
press G(VOL+).
3) When Channel Recover is completed, set will be turned off
and LED light go to stand-by mode.
* Before AV ADC Calibration, should be executed the “Tool option 1”
4. Select method of Tool option 1
1) Press ADJ Key in the Adjust remote control.
2) Select “Tool option 1” by using D/E(CH+/-) key, and press
A(ENTER).
3) Select “Maker” by using D/E(CH+/-) key, and change the
module maker and. applied module classification by using
F/G(VOL+/-).
4) Select “Inch” by using D/E(CH+/-) key, and change the
module according to the inch of model.
5) Select “Tool” by using D/E(CH+/-) key, and change the
tool name according to the model.
(Inch of model : 26”, 32”, 37”, 42”, Applied module under
the classification)
6) After changing the Tool option1, push the EXIT key.
5. Substrate ADC Calibration
5.1. Adjustment of RF/AV
Model : 202 / Pattern : 65
5.2 Adjustment of Component.
Model : 215/ Pattern : 65
5.3 Adjustment of RGB
Model : 3/ Pattern : 65
<Fig. 1>
Model Name
37LG5500
42LG5500
42LG5500
Tool Option 1
51920
35540(Vitiaz2)
51924(Vitiaz3)
Maker
LPL
LPL
LPL
Inch
37
42
42
Tool
LG5500
LG5500
LG5500

Copyright LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
C2008
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6. 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 separately because HDMI1 is
different from HDMI2.
6.1. EDID Data
6.2. Data
(1) ANALOG (128 bytes)
(2) HDMI 1 (256 bytes)=>
=> Detail EDID Options are below (a, b, c, d, e-1, e-2, f-1, f-2)
(3) HDMI 2 (256 bytes)
=> Detail EDID Options are below (a, b, c, d, e-1, e-2, f-1, f-2)
(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):
(e) Checksum: Changeable by total EDID data.
(f) Vendor Specific(HDMI)
Item
Manufacturer 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 or HDMI
For HDMI EDID
0x000x010x02 0x03 0x04 0x05 0x060x07 0x08 0x09 0x0A 0x0B0x0C0x0D 0x0E 0x0F
0x00 00 FF FF FF FF FF FF 00 1E 6D ⓐⓑ
0x01 ⓒ01 03 01 46 27 78 EA D9 B0 A3 57 49 9C 25
0x02 11 49 4B A5 6E 00 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 58 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 ⓓ00 ⓔ
For Analog EDID
Data(Hex)
000000FC0033374C47353530300A20202020
000000FC0034324C47353530300A20202020
Model name
37LG5500
42LG5500
INPUT MODEL NAME(HEX)
HDMI1 67030C001000B82D
HDMI2 67030C002000B82D
HDMI3 67030C003000B82D
0x000x010x02 0x03 0x04 0x05 0x060x07 0x08 0x09 0x0A 0x0B0x0C0x0D 0x0E 0x0F
0x00 00 FF FF FF FF FF FF 00 1E 6D ⓐⓑ
0x01 ⓒ01 03 80 46 27 78 EA D9 B0 A3 57 49 9C 25
0x02 11 49 4B A5 6E 00 31 40 45 40 61 40 81 80 90 40
0x03 A9 40 D1 C0 01 01 1A 36 80 A0 70 38 1F 40 30 20
0x04 35 00 E8 26 32 00 00 1A 1B 21 50 A0 51 00 1E 30
0x05 48 88 35 00 BC 86 21 00 00 1C 00 00 00 FD 00 39
0x06 4B 1F 54 12 00 0A 20 20 20 20 20 20 ⓓ
0x07 ⓓ01 ⓔ
0x00 02 03 23 F1 4E 81 02 03 15 12 13 04 14 05 20 21
0x01 22 1F 10 23 15 07 50 83 01 00 00 ⓕ
0x02 ⓕ01 1D 00 80 51 D0 1C 20 40 80 35 00 BC
0x03 88 21 00 00 1E 8C 0A D0 8A 20 E0 2D 10 10 3E 96
0x04 00 13 8E 21 00 00 18 02 3A 80 18 71 38 2D 40 58
0x05 2C 45 00 06 44 21 00 00 1E 01 1D 80 18 71 1C 16
0x06 20 58 2C 25 00 C4 8E 21 00 00 9E 4E 1F 00 80 51
0x07 00 1E 30 40 80 37 00 BC 88 21 00 00 18 00 00 ⓔ
0x000x010x02 0x03 0x04 0x05 0x060x07 0x08 0x09 0x0A 0x0B0x0C0x0D 0x0E 0x0F
0x00 0 FF FF FF FF FF FF 0 1E 6D ⓐⓑ
0x01 ⓒ1 3 80 46 27 78 EA D9 B0 A3 57 49 9C 25
0x02 11 49 4B A5 6E 0 31 40 45 40 61 40 D1 C0 1 1
0x03 1 1 1 1 1 1 2 3A 80 18 71 38 2D 40 58 2C
0x04 45 0 C4 8E 21 0 0 1E 1B 21 50 A0 51 0 1E 30
0x05 48 88 35 0 BC 86 21 0 0 1C ⓓ
0x06 ⓓ000FD
0x07 0 32 4B 1C 43 0F 0 0A 20 20 20 20 20 20 1 ⓔ-2
0x00 2 3 21 F1 4E 2 11 1 3 12 13 4 14 5 21 1F
0x01 20 22 10 23 9 7 7 83 1 0 0 65 3 0C 0 10
0x02 0 1 1D 0 BC 52 D0 1E 20 B8 28 55 40 C4 8E 21
0x03 0 0 1E 1 1D 0 72 51 D0 1E 20 6E 28 55 0 C4
0x04 8E 21 0 0 1E 1 1D 80 D0 72 1C 16 20 10 2C 25
0x05 80 C4 8E 21 0 0 9E 8C 0A D0 90 20 40 31 20 0C
0x06 40 55 0 C4 8E 21 0 0 18 4E 1F 0 80 51 0 1E
0x07 30 40 80 37 0 BC 88 21 0 0 18 0 0 0 0 ⓕ-2

7. ADC Calibration
<Caution>
- System control RS-232 Host should be “PC” for adjustment.
- Before AV ADC Calibration, execute the “Module selection”.
7.1. 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) On bottom side of OSD, “AV OK” means the adjustment
is completed.
7.2. Adjustment of Component
(1) Required Equipments
- Remote controller for adjustment
- MSPG-925FS Pattern Generator (Which has 720p/50Hz
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) On bottom side of OSD, “Component OK” means the
adjustment is completed.
7.3 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:65, pattern:60) 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) On bottom side of OSD, “RGB OK” means the
adjustment is completed.
- 12 -
Copyright LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
C2008
ADC RF/AV/S-VIDEO Component RGB-PC
MSPG925FS PALJ Model:215 (720P) Model: 60
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>

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Only for training and service purposes LGE Internal Use Only
C2008
- 13 -
* Before White-balance, the AV ADC should be done.
8. White Balance
* Test Equipment
Color Analyzer (CA-210/CH.9)
->When you adjust LCD color temperature, on Color
analyzer (CA-210), you should use Channel 9 which is
Matrix compensated (White, Red, Green, Blue revised) by
CS-1000 and adjust in accordance with White balance
adjustment coordinate which is specified on the next.
* Color temperature standards according to CSM and Module
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, Medium, Warm mode
* Connecting picture of the measuring instrument (On
Automatic control )
Inside PATTERN is used when W/B is controlled. Connect to
auto controller or push control R/C IN-START
-> Enter the mode of White-Balance, the pattern will come
out.
* 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.
8.1. Auto white Balance
(set:RS-233 Host:PC, Baud Rate:115200bps, Download:Cortez)
: Inside pattern is used when white 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.
Cool CS-1000 CA-210(CH 9)
x 0.276 0.276±0.002
y 0.283 0.283±0.002
∆uv 0.000 0.000
Medium CS-1000 CA-210(CH 9)
x 0.285 0.285±0.002
y 0.293 0.293±0.002
∆uv 0.000 0.000
Warm CS-1000 CA-210(CH 9)
x 0.313 0.313±0.002
y 0.329 0.329±0.002
∆uv 0.004 0.004
<Fig. 2> Connecting picture (On Automatic Control)
Type LD82D
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

8.2. 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)
9. 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:Gprobe, 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.
- 14 -
Copyright LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
C2008

Copyright LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
C2008
- 15 -
TROUBLESHOOTING
1. Power Board
1-1. The whole flowchart which it follows in voltage output state
Start check
Manufacture’s enterprise
meaning of a passage
1. Check the Power Off
condition
Doesn’t the screen
wole come out?
It is
identical with power
off condition?
Yes
Yes
No
No
No
No
No
2. Check the Interface
signal condition.
Is the Interface
signal operating?
Yes
3. Check the St-by 5V
signal circuit.
Doesn’t the low
pressure output
come out?
Doesn’t the
St-by 5V signal
come out?
Yes
No
No
4. Check the 5V Monitor
signal circuit.
Doesn’t the
5V Monitor signal
come out?
No
7. Check the VSC Vs-ON
signal
Doesn’t the high
tension output
come out?
Doesn’t the
VSC signal Vs-ON
come out?
Yes
No
High tension
output Voltage drop it
occurs?
When
remove the Y B/D
Module input connector,
output voltage drop is
occurs?
When remove
the Y, Z B/D Module Input
connector Power Board high
tension output voltage
drop it occurs?
Yes No No
9. Check the Power
Board Output high
tension circuit
Yes
10. Check the Z B/D
Module output circuit
Yes
When
remove the
Z B/D Module input
connector,
output voltage drop
is occurs?
11. Check the Y B/D
Module output circuit
Yes
No
8. Check the Vs, Va
voltage output circuit.
Doesn’t the
Vs, Va voltage output
come out?
No
No
No
5. Check the VSC RL-ON
signal.
Doesn’t the
VSC signal RL-ON
come out?
Yes
6. Check the VSC low
pressure output
Doesn’t the
VSC low pressure
output come out?
Yes

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C2008
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2. No Power
(1) Symptom
1) Doesn’t minute discharge at module.
2) Non does not come into the front LED.
(2) Check follow
Is plug in power cord? Plug in power cord.
Yes
No
Is connect the Line Filter and
Power Board Cable? Connect Cable.
Yes
No
Is normal the Fuse(F101) on
Power Board? Replace Fuse.
Yes
No
Is connect the Power Board and
13P of VSC Board Cable? Connect Cable.
Yes
No
After remove the cable connect to
Power Board(except the SC101
connection cable), authorizes the
AC voltage marking on manual.
When ST-BY 5V does not operate,
replace Power Board.

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Only for training and service purposes LGE Internal Use Only
C2008
- 17 -
3. Protect Mode
(1) Symptom
1) After once shining, it does not discharge minutely from module.
2) The Rely falls(The sound is audible “click”)
3) It is converted with the color where the front LED is red from green.
(2) Check follow
Is normal the Power
Board? Replace Power Board.
Is output the normality Low/High
voltage except Stand-by 5V?
Yes
No No
Is normal the each
connector? Replace connector.
Replace
Y-Board.
After connecting well each connector,
the normality it operates?
Yes
No Yes
Is normal the Ctrl
Board? Replace X-Board.
Is normal the output voltage after
remove P1, 2, 4, 9, 10 connector of
Ctrl-B/D?
Yes
No Yes
Is normal the Y-
Board?
Is normal the output
voltage after remove
P103 connector of Y-
B/D?
Is normal the Fuse(FS101,FS102) on
Y-B/D? (In case of open is replace)
Yes
No Yes Yes
Replace
Z-Board.
Is normal the Z-
Board?
Is normal the output
voltage after remove
P1 connector of Z-
B/D?
Is normal the Fuse(FS1, FS2) on
Z-B/D? (In case of open is replace)
Yes
No Yes
Is normal the X-
Board?
Is normal the output voltage after
remove P1, 2, 3, 4, 5 connector
of X-B/D?
After remove P1, P2, P3 output voltage
normality: Replace Right X-B/D
After remove P4, P5 output voltage
normality: Replace Left X-B/D
Yes
No Yes
Is normal the VSC
Board? Is normal the output voltage after remove P900, P901 of VSC Board?
After crisis COF of each board, check the normality operates If in case normality
operates, correspondence COF Fail is replace the module.
After remove P900, P901 normal operation:
Replace VSC Board
Yes
No
Is normal the COF of
X,Y,Z?
No
Yes
Yes

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C2008
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Does minute
discharge At Module?
Is the LVDS cable
normal?
Is the VAVS on?
Check the LCD Module
Yes
No
YES
Yes
Reconnect the
LVDS cable in P801.
No
Is the IC700 (FLI8548)
Output normal? Replace the VSC
No
NO Replace the
Power board.
Is output the normality
Low/High voltage except
stand-by 5V?
NO
4. No Raster
(1) Symptom
1) No OSD and image occur at screen..
2) It maintains the condition where the front LED is green.
(2) Check follow

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C2008
- 19 -
5. In case of occur strange screen into specific mode
5-1. In case of does’t display the OSD
(1) Symptom
1) LED is green.
2) The minute discharge continuously becomes accomplished from module
(2) Check follow
Is normal the
LVDS cable?
Is normal the
VSC Board?
Is the LVDS cable
connected well?
Cable inserts well.
Yes
No
No
Yes
Operates the FIL8548
IC(IC700)?
Replace FIL8548
IC(IC700).
No
Is normal the
CtrlBoard of Module? Replace Ctrl B/D.
No
No
Yes Replace VSC B/D
Replace cable.
Yes

5-2 In case of does’t display the screen into specific mode
(1) Symptom
1) The screen does not become the display from specific input mode
(RF, AV, Component, RGB, DVI).
(2) Check follow
1) Check the all input mode should become normality display.
2) Check the Video(Main)/Data(Sub), Video(Main)/Video(Sub) should become
normality display from the PIP mode or DW mode. (Re-Check it Swap)
(3) In case of becomes unusual display from RF mode
(4) In the case of becomes unusual display from Component, RGB mode
(5) In the case of becomes unusual display from HDMI mode
(6) In the case of becomes unusual display from SCART1 mode
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C2008
- 20 -
Is normal the Tuner?
Is normal the CXA2069Q?
Is the Tuner Cable connected well?
Cable inserts well.
Yes
No
No
Yes
Is normal the FIL8548?
Replace Tuner
No
Is normal the Input voltage,
IIC Communication and CVBS output?
Yes
Is normal the Input voltage,
IIC Communication and HV sync?
No Replace IC
No
Is normal the Input voltage,
IIC Communication and HV sync?
No
Block A
Replace IC
No
Is R,G,B input and H,V
Sync of the JK1100 normal? Check the input source.
No
Yes
Same as Block A
Is normal the
SIL9125 (IC1000)?
Yes
Same as Block A
Is normal the Input voltage,
IIC Communication and HV sync?
No Replace IC
No
Is Video input of A/V jack
normal? (JK1200)
Yes
Same as Block A
Check the input source.
No