LG 32LG50D User manual

LCD TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : LE81D
MODEL : 32LG50D 32LG50D-HD
website:http://biz.LGservice.com
Internal Use Only

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CONTENTS
CONTENTS .............................................................................................. 2
PRODUCT SAFETY ..................................................................................3
SPECIFICATION ........................................................................................6
ADJUSTMENT INSTRUCTION .................................................................9
TROUBLE SHOOTING ........................................................................... 13
BLOCK DIAGRAM.................................................................................. 17
EXPLODED VIEW .................................................................................. 18
SVC. SHEET ...............................................................................................

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SAFETY PRECAUTIONS
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the
Schematic Diagram and Replacement Parts List.
It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent
Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
General Guidance
An isolation Transformer should always be used during the
servicing of a receiver whose chassis is not isolated from the AC
power line. Use a transformer of adequate power rating as this
protects the technician from accidents resulting in personal injury
from electrical shocks.
It will also protect the receiver and it's components from being
damaged by accidental shorts of the circuitry that may be
inadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this TV receiver is blown,
replace it with the specified.
When replacing a high wattage resistor (Oxide Metal Film Resistor,
over 1W), keep the resistor 10mm away from PCB.
Keep wires away from high voltage or high temperature parts.
Before returning the receiver to the customer,
always perform an AC leakage current check on the exposed
metallic parts of the cabinet, such as antennas, terminals, etc., to
be sure the set is safe to operate without damage of electrical
shock.
Leakage Current Cold Check(Antenna Cold Check)
With the instrument AC plug removed from AC source, connect an
electrical jumper across the two AC plug prongs. Place the AC
switch in the on position, connect one lead of ohm-meter to the AC
plug prongs tied together and touch other ohm-meter lead in turn to
each exposed metallic parts such as antenna terminals, phone
jacks, etc.
If the exposed metallic part has a return path to the chassis, the
measured resistance should be between 1MΩ and 5.2MΩ.
When the exposed metal has no return path to the chassis the
reading must be infinite.
An other abnormality exists that must be corrected before the
receiver is returned to the customer.
Leakage Current Hot Check (See below Figure)
Plug the AC cord directly into the AC outlet.
Do not use a line Isolation Transformer during this check.
Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor
between a known good earth ground (Water Pipe, Conduit, etc.)
and the exposed metallic parts.
Measure the AC voltage across the resistor using AC voltmeter
with 1000 ohms/volt or more sensitivity.
Reverse plug the AC cord into the AC outlet and repeat AC voltage
measurements for each exposed metallic part. Any voltage
measured must not exceed 0.75 volt RMS which is corresponds to
0.5mA.
In case any measurement is out of the limits specified, there is
possibility of shock hazard and the set must be checked and
repaired before it is returned to the customer.
Leakage Current Hot Check circuit
1.5 Kohm/10W
To Instrument's
exposed
METALLIC PARTS
Good Earth Ground
such as WATER PIPE,
CONDUIT etc.
AC Volt-meter
IMPORTANT SAFETY NOTICE
0.15uF

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CAUTION: Before servicing receivers covered by this service
manual and its supplements and addenda, read and follow the
SAFETY PRECAUTIONS on page 3 of this publication.
NOTE: If unforeseen circumstances create conflict between the
following servicing precautions and any of the safety precautions on
page 3 of this publication, always follow the safety precautions.
Remember: Safety First.
General Servicing Precautions
1. Always unplug the receiver AC power cord from the AC power
source before;
a. Removing or reinstalling any component, circuit board
module or any other receiver assembly.
b. Disconnecting or reconnecting any receiver electrical plug or
other electrical connection.
c. Connecting a test substitute in parallel with an electrolytic
capacitor in the receiver.
CAUTION: A wrong part substitution or incorrect polarity
installation of electrolytic capacitors may result in an
explosion hazard.
2. Test high voltage only by measuring it with an appropriate high
voltage meter or other voltage measuring device (DVM,
FETVOM, etc) equipped with a suitable high voltage probe.
Do not test high voltage by "drawing an arc".
3. Do not spray chemicals on or near this receiver or any of its
assemblies.
4. Unless specified otherwise in this service manual, clean
electrical contacts only by applying the following mixture to the
contacts with a pipe cleaner, cotton-tipped stick or comparable
non-abrasive applicator; 10% (by volume) Acetone and 90% (by
volume) isopropyl alcohol (90%-99% strength)
CAUTION: This is a flammable mixture.
Unless specified otherwise in this service manual, lubrication of
contacts in not required.
5. Do not defeat any plug/socket B+ voltage interlocks with which
receivers covered by this service manual might be equipped.
6. Do not apply AC power to this instrument and/or any of its
electrical assemblies unless all solid-state device heat sinks are
correctly installed.
7. Always connect the test receiver ground lead to the receiver
chassis ground before connecting the test receiver positive
lead.
Always remove the test receiver ground lead last.
8. Use with this receiver only the test fixtures specified in this
service manual.
CAUTION: Do not connect the test fixture ground strap to any
heat sink in this receiver.
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid-state) devices can be damaged easily
by static electricity. Such components commonly are called
Electrostatically Sensitive (ES) Devices. Examples of typical ES
devices are integrated circuits and some field-effect transistors and
semiconductor "chip" components. The following techniques
should be used to help reduce the incidence of component
damage caused by static by static electricity.
1. Immediately before handling any semiconductor component or
semiconductor-equipped assembly, drain off any electrostatic
charge on your body by touching a known earth ground.
Alternatively, obtain and wear a commercially available
discharging wrist strap device, which should be removed to
prevent potential shock reasons prior to applying power to the
unit under test.
2. After removing an electrical assembly equipped with ES
devices, place the assembly on a conductive surface such as
aluminum foil, to prevent electrostatic charge buildup or
exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ES
devices.
4. Use only an anti-static type solder removal device. Some solder
removal devices not classified as "anti-static" can generate
electrical charges sufficient to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate
electrical charges sufficient to damage ES devices.
6. Do not remove a replacement ES device from its protective
package until immediately before you are ready to install it.
(Most replacement ES devices are packaged with leads
electrically shorted together by conductive foam, aluminum foil
or comparable conductive material).
7. Immediately before removing the protective material from the
leads of a replacement ES device, touch the protective material
to the chassis or circuit assembly into which the device will be
installed.
CAUTION: Be sure no power is applied to the chassis or circuit,
and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged
replacement ES devices. (Otherwise harmless motion such as
the brushing together of your clothes fabric or the lifting of your
foot from a carpeted floor can generate static electricity
sufficient to damage an ES device.)
General Soldering Guidelines
1. Use a grounded-tip, low-wattage soldering iron and appropriate
tip size and shape that will maintain tip temperature within the
range or 500°F to 600°F.
2. Use an appropriate gauge of RMA resin-core solder composed
of 60 parts tin/40 parts lead.
3. Keep the soldering iron tip clean and well tinned.
4. Thoroughly clean the surfaces to be soldered. Use a mall wire-
bristle (0.5 inch, or 1.25cm) brush with a metal handle.
Do not use freon-propelled spray-on cleaners.
5. Use the following unsoldering technique
a. Allow the soldering iron tip to reach normal temperature.
(500°F to 600°F)
b. Heat the component lead until the solder melts.
c. Quickly draw the melted solder with an anti-static, suction-
type solder removal device or with solder braid.
CAUTION: Work quickly to avoid overheating the
circuitboard printed foil.
6. Use the following soldering technique.
a. Allow the soldering iron tip to reach a normal temperature
(500°F to 600°F)
b. First, hold the soldering iron tip and solder the strand against
the component lead until the solder melts.
c. Quickly move the soldering iron tip to the junction of the
component lead and the printed circuit foil, and hold it there
only until the solder flows onto and around both the
component lead and the foil.
CAUTION: Work quickly to avoid overheating the circuit
board printed foil.
d. Closely inspect the solder area and remove any excess or
splashed solder with a small wire-bristle brush.
SERVICING PRECAUTIONS

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IC Remove/Replacement
Some chassis circuit boards have slotted holes (oblong) through
which the IC leads are inserted and then bent flat against the
circuit foil. When holes are the slotted type, the following technique
should be used to remove and replace the IC. When working with
boards using the familiar round hole, use the standard technique
as outlined in paragraphs 5 and 6 above.
Removal
1. Desolder and straighten each IC lead in one operation by gently
prying up on the lead with the soldering iron tip as the solder
melts.
2. Draw away the melted solder with an anti-static suction-type
solder removal device (or with solder braid) before removing the
IC.
Replacement
1. Carefully insert the replacement IC in the circuit board.
2. Carefully bend each IC lead against the circuit foil pad and
solder it.
3. Clean the soldered areas with a small wire-bristle brush.
(It is not necessary to reapply acrylic coating to the areas).
"Small-Signal" Discrete Transistor
Removal/Replacement
1. Remove the defective transistor by clipping its leads as close as
possible to the component body.
2. Bend into a "U" shape the end of each of three leads remaining
on the circuit board.
3. Bend into a "U" shape the replacement transistor leads.
4. Connect the replacement transistor leads to the corresponding
leads extending from the circuit board and crimp the "U" with
long nose pliers to insure metal to metal contact then solder
each connection.
Power Output, Transistor Device
Removal/Replacement
1. Heat and remove all solder from around the transistor leads.
2. Remove the heat sink mounting screw (if so equipped).
3. Carefully remove the transistor from the heat sink of the circuit
board.
4. Insert new transistor in the circuit board.
5. Solder each transistor lead, and clip off excess lead.
6. Replace heat sink.
Diode Removal/Replacement
1. Remove defective diode by clipping its leads as close as
possible to diode body.
2. Bend the two remaining leads perpendicular y to the circuit
board.
3. Observing diode polarity, wrap each lead of the new diode
around the corresponding lead on the circuit board.
4. Securely crimp each connection and solder it.
5. Inspect (on the circuit board copper side) the solder joints of
the two "original" leads. If they are not shiny, reheat them and if
necessary, apply additional solder.
Fuse and Conventional Resistor
Removal/Replacement
1. Clip each fuse or resistor lead at top of the circuit board hollow
stake.
2. Securely crimp the leads of replacement component around
notch at stake top.
3. Solder the connections.
CAUTION: Maintain original spacing between the replaced
component and adjacent components and the circuit board to
prevent excessive component temperatures.
Circuit Board Foil Repair
Excessive heat applied to the copper foil of any printed circuit
board will weaken the adhesive that bonds the foil to the circuit
board causing the foil to separate from or "lift-off" the board. The
following guidelines and procedures should be followed whenever
this condition is encountered.
At IC Connections
To repair a defective copper pattern at IC connections use the
following procedure to install a jumper wire on the copper pattern
side of the circuit board. (Use this technique only on IC
connections).
1. Carefully remove the damaged copper pattern with a sharp
knife. (Remove only as much copper as absolutely necessary).
2. carefully scratch away the solder resist and acrylic coating (if
used) from the end of the remaining copper pattern.
3. Bend a small "U" in one end of a small gauge jumper wire and
carefully crimp it around the IC pin. Solder the IC connection.
4. Route the jumper wire along the path of the out-away copper
pattern and let it overlap the previously scraped end of the good
copper pattern. Solder the overlapped area and clip off any
excess jumper wire.
At Other Connections
Use the following technique to repair the defective copper pattern
at connections other than IC Pins. This technique involves the
installation of a jumper wire on the component side of the circuit
board.
1. Remove the defective copper pattern with a sharp knife.
Remove at least 1/4 inch of copper, to ensure that a hazardous
condition will not exist if the jumper wire opens.
2. Trace along the copper pattern from both sides of the pattern
break and locate the nearest component that is directly
connected to the affected copper pattern.
3. Connect insulated 20-gauge jumper wire from the lead of the
nearest component on one side of the pattern break to the lead
of the nearest component on the other side.
Carefully crimp and solder the connections.
CAUTION: Be sure the insulated jumper wire is dressed so the
it does not touch components or sharp edges.

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SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement .
3. General Specification
No Item Specification Remark
1. Video input applicable system PAL BG
2. Receivable Broadcasting System Hong Kong
- Analog : PAL BG, D/K, I, NTSC-M
- Digital : DMB-T
3. RF Input Channel [PAL]
Band VHF (E2~E12) UHF (E21~E69)
CATV (S1~S20) HYPER (S21~S47)
[NTSC]
Band V/UHF (2~83) CATV(1~71)
[DVB-T / DMB-T]
Band UHF (21~69)
4. Input Voltage 100-240V~/50Hz, 60Hz
5. Market Hong Kong
6. Operating Environment 1) Temp : 0 ~ 40 deg
2) Humidity : 10 ~ 90 %RH
7. Storage Environment 1) Temp : -20 ~ 50 deg
2) Humidity : 10 ~ 90 %RH
8. Power Consumption ≤ 150 (32”)
9. Stand by ≤ 1W
10. Frequency range H : 31 ~ 61Khz PC Input
V : 56 ~ 75Hz
11. Video Input (2EA) PAL, SECAM, NTSC
12. S-Video Input (1EA) PAL, SECAM, NTSC Side only
13. Component Input (2EA) Y/Cb/Cr, Y/ Pb/Pr
14. RGB Input (1EA) RGB-PC
15. HDMI Input (2EA) HDMI-PC
HDMI-DTV
16. Audio Input (5 EA) PC Audio, Component (2EA), AV (2EA) L/R Input
17. SPDIF out (1EA) SPDIF OUT
18. AV out (1EA)
1. Application range
This specification is applied to LE81D chassis.
2. Requirement for Test
Each part is tested as below without special appointment.
(1) Temperature : 25 ± 5°C(77 ± 9°F), CST : 40 ± 5°C
(2) Humidity : 65% ± 10%
(3) Power : Standard input voltage (100-240V~, 50/60Hz)
* Standard Voltage of each products is marked by models.
(4) Specification and performance of each parts are followed
each drawing and specification by part number in
accordance with BOM.
(5) The receiver must be operated for about 20 minutes prior
to the adjustment.
3. Test method
(1) Performance : LGE TV test method followed
(2) Demanded other specification
Safety : CE, IEC Specification
EMC : CE, IEC specification

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)
720*480 15.75 60.00 13.514 SDTV, DVD 480I(525I)
2. 720*576 15.625 50.00 13.500 SDTV, DVD 576I(625I)
3. 720*480 31.47 59.94 27.000 SDTV 480P
720*480 31.50 60.00 27.027 SDTV 480P
4. 720*576 31.25 50.00 27.000 SDTV 576P
5. 1280*720 44.96 59.94 74.176 HDTV 720P
1280*720 45.00 60.00 74.250 HDTV 720P
6. 1280*720 37.50 50.00 74.25 HDTV 720P 50Hz
7. 1920*1080 33.72 59.94 74.176 HDTV 1080I
1920*1080 33.75 60.00 74.250 HDTV 1080I
8. 1920*1080 28.125 50.00 74.250 HDTV 1080I 50Hz,
9. 1920*1080 67.5 60.00 148.5 HDTV 1080P
1920*1080 67.432 59.940 148.350 HDTV 1080P
10. 1920*1080 56.25 50.00 148.5 HDTV 1080P 50Hz,
11. 1920*1080 27.00 24.00 74.250 HDTV 1080P 24Hz
12. 1920*1080 33.75 30.00 74.250 HDTV 1080P 30Hz
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4. Component Video Input (Y, PB, PR)
5. RGB INPUT(PC)
No Resolution H-freq.(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed Remark
1. 720*400 31.468 70.08 28.32 DOS
2. 640*480 31.469 59.94 25.17 VESA(VGA)
3. 640*480 37.500 75.00 31.50 VESA(VGA)
4. 800*600 37.879 60.31 40.00 VESA(SVGA)
5. 800*600 46.875 75.00 49.50 VESA(SVGA)
6. 1024*768 48.363 60.00 65.00 VESA(XGA)
7. 1024*768 56.476 70.06 75.00 VESA(XGA)
8. 1024*768 60.023 75.02 78.75 VESA(XGA)
9. 1280*768 47.776 59.87 79.50 WXGA(50”,60”)
10. 1360*768 47.712 60.01 85.50 WXGA(50”,60”)
11. 1366*768 47.700 60.00 84.62 WXGA(50”,60”)
12. 1280*1024 64.00 60.00 108.00 WUXGA Only LPL FHD 42” / 47”
13. 1920*1080 66.59 59.93 138.5 WUXGA Only LPL FHD 42” / 47”

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6. HDMI Input (PC)
No Resolution H-freq.(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed Remark
1. 720*400 31.468 70.08 28.32 DOS
2. 640*480 31.469 59.94 25.17 VESA(VGA)
3. 640*480 37.500 75.00 31.50 VESA(VGA)
4. 800*600 37.879 60.31 40.00 VESA(SVGA)
5. 800*600 46.875 75.00 49.50 VESA(SVGA)
6. 1024*768 48.363 60.00 65.00 VESA(XGA)
7. 1024*768 56.476 70.06 75.00 VESA(XGA)
8. 1024*768 60.023 75.02 78.75 VESA(XGA)
9. 1280*768 47.776 59.87 79.50 WXGA(50”,60”)
10. 1360*768 47.712 60.01 85.50 WXGA(50”,60”)
11. 1366*768 47.700 60.00 84.62 WXGA(50”,60”)
12. 1280*1024 64.00 60.00 108.00 WUXGA Only LPL FHD 42” / 47”
13. 1920*1080 66.59 59.93 138.5 WUXGA Only LPL FHD 42” / 47”
6. HDMI Input (DTV)
No Resolution H-freq.(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed Remark
1. 720*480 31.47 59.94 27.000 SDTV 480P
2. 720*480 31.50 60.00 27.027 SDTV 480P
3. 720*576 31.25 50.00 27.000 SDTV 576P
4. 1280*720 44.96 59.94 74.176 HDTV 720P
5. 1280*720 45.00 60.00 74.250 HDTV 720P
6. 1280*720 37.50 50.00 74.25 HDTV 720P 50Hz
7. 1920*1080 33.72 59.94 74.176 HDTV 1080I
8. 1920*1080 33.75 60.00 74.250 HDTV 1080I
9. 1920*1080 28.125 50.00 74.250 HDTV 1080I 50Hz
10. 1920*1080 67.5 60 148.5 HDTV 1080P
11. 1920*1080 67.432 59.940 148.350 HDTV 1080P
12. 1920*1080 56.25 50 148.5 HDTV 1080P 50Hz
13. 1920*1080 27.00 24.00 74.25 HDTV 1080P 24Hz
14. 1920*1080 33.75 30.00 74.25 HDTV 1080P 30Hz

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ADJUSTMENT INSTRUCTION
1. Application Range
This spec. sheet is applied to Hong Kong DTV 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 5 minutes at Full
White mode.(Power on key)
3. ADC Calibration
<Caution>
- System control RS-232 Host should be “PC” for adjustment.
- Press the FRONT-AV key on R/C for converting input mode.
(change RS-232 Host:pc, BaudRate:115200bps)
<Note>
HDMI1, 2 & Volume 30, 50, 100 of FCR R/C is available only
DFT(Discrete Function Test) Mode.
3.1. Adjustment of RF/AV/S-VIDEO
(1) Required Equipments
1) Remote controller for adjustment
2) 802F Pattern Generator, Master (MSPG-925FA), etc.
3) MSPG-925FA Pattern Generator (Which has Video
Signal : 100% Color Bar Pattern shown in Fig. 1)
-> Model: 202 / Pattern : 65
(2) Method of Auto RF/AV/S-VIDEO Color Balance.
1) Press the FRONT-AV key on R/C for converting input
mode.
2) Input the Video Signal: 100% Color Bar signal into AV
3) Set the PSM to Vivid mode in the Picture menu.
4) Press ADJ key on R/C for adjustment.
5) Press the G (Vol.+) key to operate the set, then it becomes
automatically.
6) Auto-RGB OK means the adjustment is completed.
3.2. Adjustment of Component.
(1) Required Equipments
1) Remote controller for adjustment
2) 802F Pattern Generator, Master (MSPG-925FA), etc.
3) MSPG-925FA Pattern Generator(Which has 720p@60Hz
YPbPr signal : 100% Color Bar Pattern shown in Fig. 1)
-> Model: 217 / Pattern: 65
4) It is very import to use correct adjustment pattern like Fig.1).
# Within the pattern, color sequence should be aligned
: White-Yellow-Cyan-Green-Gray-Red-BLUE-BLACK
(If color sequence is reversed (Black -> …-> White),
reverse the pattern with REV key, when using Master
pattern generator like MSPG-925)
# If Minimum Black Level and/or Maximum White Level is
not correct, Do select 100% Color Bar Pattern.
(2) Method of Auto Component Color Balance
1) Input the Component1 720p 100% Color Bar (MSPG-
925FA model:217, pattern:65) signal into Component.
2) Set the PSM to Vivid mode in the Picture menu.
3) Press the ADJ key on R/C for adjustment.
4) Press the G (Vol.+) key to operate the set, then it becomes
automatically.
5) Auto-RGB OK means the adjustment is completed.
3.3. Adjustment of RGB
(1) Required Equipments
1) Remote controller for adjustment
2) 802F Pattern Generator, Master (MSPG-925FA), etc.
3) MSPG-925F Pattern Generator
(Which has XGA [1024*768] 60Hz PC Format output
signal : 100% Color Bar Pattern shown in Fig. 1).
4) It is very import to use correct adjustment pattern like Fig.1.
# Within the pattern, color sequence should be aligned :
White-Yellow-Cyan-Green-Magenta-Red-BLUE-BLACK (If
color sequence is reversed (Black -> …-> White), reverse
the pattern with REV key, when using Master pattern
generator like MSPG-925)
# If Minimum Black Level and/or Maximum White Level is
not correct, Do select 100% Color Bar Pattern.
(2) Method of Auto RGB Color Balance
1) Input the PC 1024x768 @ 60Hz with 100% color bar
pattern like Fig.1. into RGB.
(Ex. MSPG-925FA, model:60, pattern:65)
2) Set the PSM to Vivid mode in Picture menu.
3) Press the INSTART 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.
*Cause:Don’t push “In-stop” key after PCB assembly adjustment.
ADC RF/AV/S-VIDEO Component RGB-PC
MSPG925FA PAL Model:217 (720P) Model: 60
INPUT SELECT AV1 Pattern:65 1024*768 60Hz
Model:202 (PAL-BGDHI) * 100% Color Bar Pattern: 65
Pattern: 65 *100% Color bar
* 100% Color Bar
<Fig. 1>

4. SET assembly adjustment items
(1) Option adjustment following BOM
- Tool Option1
- Tool Option2
- Area Option
1) Push the IN-START key in the Adjust Remocon.
2) Input the Option Number that was specified in the BOM,
into the Shipping area.
3) Select Tool Option1/ Tool Option2/ Area Option” by
using D/E(CH+/-) key, and press the number key (0~9)
consecutively
ex) If the value of Tool Option1 is 0, input the data using
number key “0”
* Cause: Don’t Push “In-stop” key after PCB assembly
adjustment.
(2) Adjustment of White Balance
(3) It’s unnecessary to download the serial number & the
model name for Diagnostics of DTV Mode.
Note) Option Data [Tool Option 1 / Tool Option 2 / Area Option]
Singapore : 32LG50D-HD [20996 / 0 / 1]
5. EDID
* Caution
1) Use the proper signal cable for EDID Download
- Analog EDID : Pin3 exists
- Digital EDID : Pin3 exists
2) Never connect HDMI & DVI-D & DVI-A Cable at the
same time.
3) Use the proper cables below for EDID Writing.
4) HDMI 1 and HDMI2 is different each other. So You have
to Download different EDID file.
5) Don’t connect the RS-232C Cable for EDID Download.
5.1. EDID Data
5.2. Data
(1) ANALOG (128 bytes)
(2) HDMI 1 (256 bytes)=>
- Block 1 (128 byte)
- Blcok 2 (128 byte)
(3) HDMI 2 (256 bytes)
Block 1 (128byte)
Block 2 (128 byte)
=> Detail EDID Options are below (a, b, c, d, e, f)
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LT81D LPL 42 FHD
S/W Version x.xx
STI Version x.xx.x
UTT XX hr.
Tool Option1 20993
Tool Option2 0
Area Option 20
:
For Analog EDID
D-sub to DVI-I
For Digital EDID
DVI-D to DVI-D
For HDMI EDID
DV-D to HDMI or HDMI to HDMI
Item
Manufacurer ID
Version
Revision
Condition
GSM
Digital : 1
Digital : 3
Data(Hex)
1E6D
01
03

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a) Product ID
b) Serial No: Controlled on production line.
c) Month, Year: Controlled on production line:
ex) Monthly : ‘03’ -> ‘03’
Year : ‘2005’ -> ‘0F’
d) Model Name(Hex):
e, f) Checksum: Changeable by total EDID data.
6. White Balance
Caution : Before White-balance, the AV ADC should be done.
<Notice>
- Do the white balance adjustment under the 10LUX
- Before white balance, press the ADJ key 2times and do the
reset like Fig.2
- Use the Torino inner pattern (216 gray pattern)
-To enter White-balance mode, press the ADJ key 2times.
Caution - System control RS-232 Host should be “PC” for
adjustment.
[Test Equipment]
- Color Analyzer (CA-110)
- CA-210
PC (for communication through RS-232C) -> UART Baud rate
: 115200
Pattern Generator (MSPG-925FA etc. )
[Color Temperature & Color Coordinates Setting]
When adjusting the Color Temperature of LCD, Color
AnalyzerCA-210(Matrix should be corrected through CH9 of
CS-1000) should be used.
Adjust the Color Temperature based below adjustment color
coordinates.
Even if CH9 of CA-210 is corrected with Matrix, there may be
many character of Module and Filter.
Therefore Refer to the below Color Coordinates Target.
But, in case of WCG module, use the CH12 of CA-210.
* Target Value CA-210 (CH 9)
(R/G/B gain and R/G/B offset Default values are different in
according to using module )
* LCD : Target Value of Brightness, Color Coordinates, Color
Temperature
Brightness : High Light : MIN 200 Cd/m2(32 WXGA, LPL)
Color-Coordinate : High Light
: Cool : X ; 0.276 ±0.002 ,Y ; 0.283 ±0.002
Warm : X ; 0.313 ±0.002,Y ; 0.329 ±0.002
Color Temperature
: 11,000K±500K(Cool), 6,500K ±500K(Warm)
6.1. Manual white Balance (INNER Pattern)
For White Balance, Adjust twice, Cool and Warm
1) Execute CA-210(9CH, 10CH and 12CH) or CA-100 Zero
Calibration. (In case of WCG module,CH12)
2) Execute the SET Heat Run for 30minutes
3) Use torino inner pattern as below Fig. 3, Supply 216Level
(85 IRE) full screen pattern
4) Enter the White Balance adjustment mode by pressing the
ADJ key twice(White Balance) on R/C.
5) Stick sensor to center of the screen and select each items
(Red/Green/Blue Gain and Offset) using D/E(CH +/-) key
on R/C..
6) Adjust with R/G/B Gain using F/G(VOL +/-) key on R/C.
7) Adjust it until color coordination becomes as below.
After All adjustment is completed, Please push “In-stop” key.
* Color Temperature : Cool, Medium, Warm
One of R/G.B Gain should be fixed at 80 and adjust two
Gain Value with decreasing the Default values from 80.
- When R Gain is Fixed at Default value(80)
Adjust G gain and B gain with decreasing Default values
from 80
- When B Gain is Fixed at Default value(80)
Adjust R gain and G gain with decreasing Default values
from 80
- When G Gain is Fixed at Default value(80)
Adjust R gain and B gain with decreasing Default values
from 80
R/G/B Gain and R/G/B Offset Default Value
Red Gain : 80, Green Gain : 80, Blue Gain : 80
Red Offset : 80, Green Offset : 80, Blue Offset : 7D
EDID Model Product - ID HEX EDID Table DDC Function
32LG50D-HD 30237 761D 0x1D, 0x76 Analog
30238 761E 0x1E, 0x76 Digital
CSM Temp. x y ∆UV
Cool 11,000k 0.276±0.002 0.283±0.002 +0.000
Warm 6,500k 0.313±0.002 0.329±0.002 +0.003
Model
LG TV 00 00 00 FC 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20
White Balance(Hex)
Color Temp. Medium
Red Gain 80
Green Gain 80
Blue Gain 80
Red Offset 80
Green Offset 80
Blue Offset 7D
Reset GTo set
<Fig. 2>
<Fig. 3>
216 Level (85 IRE)

6.2. Auto white Balance (INNER PATTERN)
- 12 -
command1 command2 Set ID Data
MODE
Input Select x b 00 00h DTV-Air
01h Cable
10h RF-Air
11h Cable
20h AV1
21h AV2
40h COMP1
41h COMP1
60h RGB-PC
90h HDMI
Min Max INIT
R-Gain_Normal j a 00 00h 80h 80h
G-Gain_Normal j b 00 00h 80h 80h
B-Gain_Normal j c 00 00h 80h 80h
R-Gain_Warm j d 00 00h 80h 80h
G-Gain_Warm j e 00 00h 80h 80h
B-Gain_Warm j f 00 00h 80h 80h
R-Gain_Cool j g 00 00h 80h 80h
G-Gain_Cool j h 00 00h 80h 80h
B-Gain_Cool j i 00 00h 80h 80h
R-Offset_Normal l j 00 00h 80h
G-Offset_Normal l k 00 00h 80h
B-Offset_Normal l l 00 00h 80h
R-Offset_Warm l m 00 00h 80h
G-Offset_Warm l n 00 00h 80h
B-Offset_Warm l o 00 00h 80h
R-Offset_Cool l p 00 00h 80h
G-Offset_Cool l q 00 00h 80h
B-Offset_Cool l r 00 00h 80h
COLOR TEMP. k u 00 00h 03h(Cool,Normal,Warm,User)
Internal Pattern w b 00 00 W/B Adjustment Start
Signal 10 Using Internal Pattern
ff W/B Adjustment Comletion

- 13 -
1. No Power
(1) Symptom
1) Does not minute discharge at module.
2) Non does not come into the front LED.
(2) Procedure check
Is the power cord plugged in? Plug in the power cord.
Yes
No
Is the Line Filter and Power
Board Cable connected? Connect the Cable.
Yes
No
Is the appropriate Fuse on
the Power Board? Replace the Fuse.
Yes
No
Is the Power Board and 13P of
VSC Board Cable connected? Connect the Cable.
Yes
No
After removing the cables, connect them to the Power Board, and
change the AC voltage marking to manual.
When ST-BY 5V does not operate, replace the Power Board.
TROUBLESHOOTING

- 14 -
Is the Inverter on?
Is the LVDC cable
normal?
Replace the Module.
Yes
No
Yes
Yes
Reconnect the LVDS
cable in P400.
No
Is the IC1200(Torino)
Output normal? Replace the Main B/D.
No
No
Replace the Power board.
Is the all of the output voltage
normal except for stand-by 5V?
2. No Raster
(1) Symptom
1) No OSD and image occur at screen.
2) It maintains the condition where the front LED is blue.
(2) Procedure check

- 15 -
3. In case of no display on the screen in specific modes
(1) Symptom
- There is no screen display from a specific input mode.
(RF, AV, Component, RGB, HDMI)
(2) Procedure check
- Check the all input mode have normal display.
(3) In case of an unusual display in RF mode
(4) In case of an unusual display in Component1,2,RGB mode
(5) In case of an unusual display in AV mode
Is the Tuner normal?
Is the CXA2069(IC300)
normal?
Is the RF Cable connected?
Re-insert the RF cable.
Yes
No
No
Yes
Is the Torino(IC1200)
normal?
Replace the Tuner.
Are the Input voltage, IIC Communication
and CVBS output normal?
Yes
Are the Input voltage, IIC
Communication and HV sync normal?
No Replace the IC300.
No
Are the input voltage, IIC
Communication and HV sync normal?
No
Replace the IC1200.
No
No
Are the AV input of JK103,
JK104 or SK105 normal?
Yes
Is the CXA2069(IC300)
normal?
Check the input source.
No
Are the Input voltage, IIC Communication
and HV sync normal?
No Replace the IC300.
No
Yes
Same as Block A
Block A
Is the RGB input and H,V Sync of the P601 normal?
Is the Component input of JK100 or JK101 normal?
Yes
Same as Block A
Check the input source.
No
(6) In case of an unusual display in HDMI mode
Is the SIL9125(IC702)
normal?
Are Input voltage, IIC Communication
and HV sync normal?
No
Replace IC702.
No
Yes
Same as Block A

- 16 -
4. In case of no sound
(1) Symptom
1) LED is Green.
2) Screen display appears but there is no sound.
(2) Procedure check
Is there no sound for
all input(modes)?
Is there no sound
onlt in HDMI?
No
Yes
Download
the EDID data
Check the signal after
CAX2069 refer to circuit diagram
No
Is ther no sound only in
Component, RGB mode?
No
YES YES
Is there no sound
only in RF?
Check the
Tuner IN/OUT
No
YES
YES
Is there no sound only
in AV mode?
Is the output of CXA2069
(IC300) normal?
No
YES
Is the MSP4450K(IC500)
operating normally? Replace the IC500.
No
IS the NTP300A(IC501)
operatioing normal? Replace the IC501.
No
YES
Replace the Main B/D.
YES
No
Replace the IC300.
Is the speaker on? Set on speaker
on in menu.
No
Is the speaker cable
normal?
Check the
speaker cable.
No
Yes

- 17 -
BLOCK DIAGRAM
Analog Audio Sig nal Analog Vi d eo Sig nal I2S Audio Sig nal Digital Vi d eo Sig nal
STi7109
MPEG Decoder
DDR
256MB*4
Flash 16MB
S29GL128N90
Torino
Digital
Analog
Tuner
DDR
128MB* 2(HD) or
256MB*2(FHD)
Flash 4MB
MX29LV
AV S/ W
CXA2069
Audio Pro
& Amp
To MSP(SIF)
To MSP To MSP
To AV S/ W
To MSP
I2S_DTV
LVDS Pin
RS232C
Speaker
MSP
From Comp 1,2 From AV S/ W From Tuner (SIF) From RGB
I2S_HDMI
RGB 2 4bits
RGB 24bits
I2S
MUX
HDMI
SPDIF_MSP I2S M U X O u t
MNT (R ± ,L ±)
OP Amp
To AV S/ W (MNT R/ L)
SPDIF Out
To STi ( TS Da ta 8)
From Tuner (TS Data 8)
To MSP
From MSP
From OP Amp (MNT R/ L)
To AV S/ W (AV IN)
From AV IN
Side A/ V
From MNT OUT
To AV S/ W (MNT OUT)
SPDIF_DTV
To AV S/ W (CVBS_OUT)
From STi (CVBS_OUT)
Demod
IC
DDR
DIF

- 18 -
122
120
510
500
121
300 200
400
521
530
800
801 805
802
804
803
820
821 540
900
910
200T
200N
EXPLODED VIEW

Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only

Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only