LG 32LF15R User manual

LCD TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : LP81A
MODEL : 32LF15R 32LF15R-MA
North/Latin America http://aic.lgservice.com
Europe/Africa http://eic.lgservice.com
Asia/Oceania http://biz.lgservice.com
Internal Use Only
Printed in KoreaP/NO : MFL41394480 (0904-REV00)

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CONTENTS
CONTENTS .............................................................................................. 2
SAFETY PRECAUTIONS ......................................................................... 3
SPECIFICATION....................................................................................... 6
ADJUSTMENT INSTRUCTION ................................................................ 9
TROUBLE SHOOTING........................................................................... 13
BLOCK DIAGRAM.................................................................................. 18
EXPLODED VIEW .................................................................................. 19
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 Exploded View.
It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent
Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
General Guidance
An isolation Transformer should always be used during the
servicing of a receiver whose chassis is not isolated from the AC
power line. Use a transformer of adequate power rating as this
protects the technician from accidents resulting in personal injury
from electrical shocks.
It will also protect the receiver and it's components from being
damaged by accidental shorts of the circuitry that may be
inadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this TV receiver is blown,
replace it with the specified.
When replacing a high wattage resistor (Oxide Metal Film Resistor,
over 1W), keep the resistor 10mm away from PCB.
Keep wires away from high voltage or high temperature parts.
Before returning the receiver to the customer,
always perform an AC leakage current check on the exposed
metallic parts of the cabinet, such as antennas, terminals, etc., to
be sure the set is safe to operate without damage of electrical
shock.
Leakage Current Cold Check(Antenna Cold Check)
With the instrument AC plug removed from AC source, connect an
electrical jumper across the two AC plug prongs. Place the AC
switch in the on position, connect one lead of ohm-meter to the AC
plug prongs tied together and touch other ohm-meter lead in turn to
each exposed metallic parts such as antenna terminals, phone
jacks, etc.
If the exposed metallic part has a return path to the chassis, the
measured resistance should be between 1MΩand 5.2MΩ.
When the exposed metal has no return path to the chassis the
reading must be infinite.
An other abnormality exists that must be corrected before the
receiver is returned to the customer.
Leakage Current Hot Check (See below Figure)
Plug the AC cord directly into the AC outlet.
Do not use a line Isolation Transformer during this check.
Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor
between a known good earth ground (Water Pipe, Conduit, etc.)
and the exposed metallic parts.
Measure the AC voltage across the resistor using AC voltmeter
with 1000 ohms/volt or more sensitivity.
Reverse plug the AC cord into the AC outlet and repeat AC voltage
measurements for each exposed metallic part. Any voltage
measured must not exceed 0.75 volt RMS which is corresponds to
0.5mA.
In case any measurement is out of the limits specified, there is
possibility of shock hazard and the set must be checked and
repaired before it is returned to the customer.
Leakage Current Hot Check circuit
1.5 Kohm/10W
To Instrument’s
exposed
METALLIC PARTS
Good Earth Ground
such as WATER PIPE,
CONDUIT etc.
AC Volt-meter
IMPORTANT SAFETY NOTICE
0.15uF

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

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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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1. Application range
This specification is applied to LP81A 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
NOTE : Specifications and others are subject to change without notice for improvement
.
4. General Specification(LCD Module)
Item Specification Measurement Result Remark
Display Screen Device 26” wide Color Display Module Resolution:1366X768
32” wide Color Display Module Resolution:1366X768
Aspect Ratio 16:9
LCD Module 26” TFT WXGA LCD 26” HD MAKER : LGD
32” TFT WXGA LCD 32” HD MAKER : LGD
Operating Environment 1) Temp. : 0 ~ 40 deg LGE SPEC
2) Humidity : 0 ~ 85%
Storage Environment 1) Temp. : -20 ~ 60 deg
2) Humidity : 0 ~ 85 %
Input Voltage AC100-240V~, 50/60Hz
Power Consumption Power on (Blue) : LF15R Volume: 1/8 volume of sound distortion point
≤110W 26” HD
≤160W 32” HD
St-By (Red) ≤1.0 W

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5. Model Specification(NON EU)
Remark
China(DK) Australia(BG)
VHF/UHF C1~C62 C1~C75
CATV S1~S41 S2~S44
Rear
Rear, Audio Out (8Ω) for commercial china
Rear
L/R Input
Specification
NON EU, CHINA
PAL SECAM B/G/D/K, PAL I/II, NTSC-M
BAND PAL NTSC
VHF/UHF E2~C69 2~78
CATV S1~S47 1~71
Upper Heterodyne
PAL, SECAM, NTSC
PAL, SECAM, NTSC
Y/Cb/Cr, Y/ Pb/Pr
HDMI-DTV, Only PCM MODE
Component (1EA), AV (1EA)
Item
Market
Broadcasting system
Available Channel
Receiving system
Video Input (1EA)
AV Output (1EA)
Component Input (1EA)
HDMI Input (1EA)
Audio Input (2EA)
Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed
720*480 15.73 59.94 13.500 SDTV, DVD 480I(525I)
720*480 15.75 60.00 13.514 SDTV, DVD 480I(525I)
720*576 15.625 50.00 13.500 SDTV, DVD 576I(625I) 50Hz
720*480 31.47 59.94 27.000 SDTV 480P
720*480 31.50 60.00 27.027 SDTV 480P
720*576 31.25 50.00 27.000 SDTV 576P 50Hz
1280*720 44.96 59.94 74.176 HDTV 720P
1280*720 45.00 60.00 74.250 HDTV 720P
1280*720 37.50 50.00 74.25 HDTV 720P 50Hz
1920*1080 28.125 50.00 74.250 HDTV 1080I 50Hz,
1920*1080 33.72 59.94 74.176 HDTV 1080I
1920*1080 33.75 60.00 74.25 HDTV 1080I
1920*1080 56.25 50 148.5 HDTV 1080P
1920*1080 67.432 59.94 148.350 HDTV 1080P
1920*1080 67.5 60.00 148.5 HDTV 1080P
6. Component Video Input (Y, PB, PR)

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Resolution H-freq.(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed Remark
720*480 15.73 59.94 13.500 SDTV, DVD 480I(525I) Spec. out but display
720*480 15.75 60.00 13.514 SDTV, DVD 480I(525I)
720*576 15.625 50.00 13.500 SDTV, DVD 576I(625I) 50Hz
720*480 31.47 59.94 27 SDTV 480P
720*480 31.5 60 27.027 SDTV 480P
720*576 31.25 50 27 SDTV 576P
1280*720 44.96 59.94 74.176 HDTV 720P
1280*720 45 60 74.25 HDTV 720P
1280*720 37.5 50 74.25 HDTV 720P
1920*1080 28.125 50 74.25 HDTV 1080I
1920*1080 33.72 59.94 74.176 HDTV 1080I
1920*1080 33.75 60 74.25 HDTV 1080I
1920*1080 56.25 50 148.5 HDTV 1080P
1920*1080 67.432 59.94 148.350 HDTV 1080P
1920*1080 67.5 60.00 148.5 HDTV 1080P
1920*1080 27 24 74.25 HDTV 1080P
1920*1080 33.75 30 74.25 HDTV 1080P
7. HDMI input (DTV)

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ADJUSTMENT INSTRUCTION
1. Application Range
This spec. sheet is applied all of the 26/32” LCD TV, LP81A
chassis (HURRICANE 5) by manufacturing 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 protect test instrument.
2) Adjustment must be done in the correct order.
3) The adjustment must be performed in the circumstance of
25±5°C of temperature and 65±10% of relative humidity if
there is no specific designation.
4) The input voltage of the receiver must keep 100-220V,
50/60Hz.
5) The receiver must be operated for about 5 minutes prior to the
adjustment when module is in the circumstance of over 15º.
In case of keeping module is in the circumstance of 0°C, it
should be placed in the circumstance of above 15ºC for 2
hours.
In case of keeping module is in the circumstance of below -
20ºC, it should be placed in the circumstance of above
15ºC for 3 hours.
3. PCB assembly adjustment method
3.1. Mstar Main S/W program download
(1) Preliminary steps
1) Download method 1 (PCB Assy)
- HD
2) Connect the download jig to D-sub jack
(2) Download steps
1) Execute ‘ISP Tool’ program in PC, then a main window
will be opened
2) Click the connect button and confirm “Dialog Box”.
3) Click the Config button and Change speed
E2PROM Device setting : over the 350Khz
4) Read and write bin file
Click “(1)Read” tab, and then load download
file(XXXX.bin) by clicking “Read”.
5) Click “Auto(2)” tab and set as below
6) click “Run(3)”.
7) After downloading, check “OK(4)” message.
Double click
(1)
filexxx.bin
filexxx.bin
(4)
.......... OK
)
(3
(2)

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3.2. Auto color balance(ADC)-Component
(1) Method of Auto Component Color Balance
1) Convert to Component in Input-source
2)Input the Component (Which has 720p@60Hz 100%
Color Bar YPbPr signal into Component.
(MSPG-925F Model: 217/ Pattern: 65)
3) Adjust by commanding AUTO_COLOR_ADJUST (0xF1)
0x00 0x02 instruction
(2) Confirmation
1) We confirm whether “0xF3 (offset), 0xF4 (gain)”address
of EEPROM “0xBC”is “0xAA”or not.
2) If “0xF3”, “0xF4”address of EEPROM “0xBC”isn’t
“0xAA”, we adjust once more.
3) We can confirm the ADC values from “0x06~0x0B”
addresses in a page “0xBC”.
* Manual ADC process using Service Remocon. After
enter Service Mode by pushing “ADJ”key, execute
“Auto-RGB”by pushing “_” key at “Auto-RGB”.
3.3. TOOL Option, Area Option
(1) Profile : Must be changed the option value because being
different with some setting value depend on module maker,
inch and market.
(2) Equipment : adjustment remote control.
(3) Adjustment method
The input methods are same as other chassis.(Use IN-
START Key on the Adjust Remocon.)
(If not changed the option, the input menu can differ the
model spec.)
* Refer to Job Expression of each main chassis ass’y
(EBTxxxxxxxx) for Option value
* Before PCBA check, you have to change the Tool option, Area
option and have to AC off/on. (Plug out and in)
* After Tool Option/ Area Option change, you have to AC power off.
* Never push the IN-STOP KEY after completing the function
inspection.
3.4. Check SW Version
(1) Method
1) Push In-start key on Adjust remote-control.
2) Check “Main V3.xx”
4. EDID (The Extended Display Identification Data )
/DDC (Display Data Channel) download
* Caution
Use the proper signal cable for EDID Download
4.1. EDID DOWNLOAD
* Caution:
- Never connect HDMI & D-SUB Cable at the same time.
- Use the proper cables below for EDID Writing
* EDID Data
<HDMI 1 : 256bytes>
The data is same without Physical address
-> Physical address(F) : HDMI 1 -> 10
- Detail EDID Options are below (A, B, C, D, E, F)
A. Product ID
B. Serial No: Controlled on production line
C. Month, Year: Controlled on production line:
ex) Monthly: ‘09 ‘09
Year: ‘2007 -> ‘11’
D. Model Name(Hex):
E. Checksum: Changeable by total EDID data
Item
Manufacturer ID
Version
Revision
Condition
GSM
Digital : 1
Digital :3
Data
1E6D
01
03
For HDMI EDID
Model name Model Name(HEX)
LG TV 00 00 00 FC 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20
Model Product ID
Name Dec Hex EDID table
HD 4018(A) 9CF5 F59C
4018(D) 9CF6 F69C

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4.2. HDCP SETTING
(High-Bandwidth Digital Contents Protection)
* Before HDCP Download, you have to Set the Configuration
that CMD delay.
-> Configuration -> Option-> I2C delay(Write Byte : 0.5 ms,
Read Byte : 0.5ms, Read CMD Byte : 0.5ms)
* Change the DDC -> After Write Data delay Time 20ms ,also
Change the After Send Read Command delay Time 20ms.
* Check the Communication Clock -> 45KHz.
(1) Connect D-sub Signal Cable to D-Sub Jack
(2) Input HDCP key with HDCP-key- in-program
(3) HDCP Key value is stored on EEPROM(AT24C64) which
is From “0x80”addresses of 0xA0 page
(4) AC off/ on and on HDCP button of MSPG925 and confirm
whether picture is displayed or not of using MSPG925
(5) HDCP Key value is different among the sets.
4.3. Adjustment of White Balance
-Purpose : Adjust the color temperature to reduce the
deviation of the module color temperature.
- Principle : To adjust the white balance without the saturation,
Fix the one of R/G/B gain to C0 and decrease the others.
- Adjustment mode : Two modes - Cool and Warm
(Medium data is automatically calibrated by the Cool data)
* Required Equipment
1) Remote controller for adjustment
2) Color Analyzer : CA100+ or CA-210 or same product (ch:9)
3) Auto W/B adjustment instrument(only for Auto adjustment)
(1) Connecting diagram of equipment for measuring (For
Automatic Adjustment
1) Enter the adjustment mode of DDC
- Set command delay time : 50ms
- Enter the DDC adjustment mode at the same time
heat-run mode when pushing the power on by power
only key
-Maintain the DDC adjustment mode with same
condition of Heat-run (Maintain after AC off/on in status
of Heat-run pattern display)
2) Release the DDC adjustment mode
- Release the adjust mode after AC off/on or std-by
off/on in status of finishing the Hear-run mode
- Release the Adjust mode when receiving the aging off
command(F3 00 00) from adjustment equipment
- Need to transmit the aging off command to TV set after
finishing the adjustment.
- Check DDC adjust mode release by exit key and
release DDC adjust mode
3) Enter the adjust mode of white balance
- Enter the white balance adjustment mode with aging
command(F3, 00, FF)
* Luminance min value is 200cd/m2≥in the cool mode (For LCD)
4.4. Adjustment of White Balance
(for Manual adjustment)
(1) Adjustment mode : Two modes (Cool and Warm)
(Medium data is automatically calibrated by the Cool data)
(2) Color analyzer(CA100+, CA210) should be used in the
calibrated ch by CS-1000(LCD : CH9, PDP : CH10)
(3) Operate the zero-calibration of the CA100+ or CA-210,
then stick sensor to the module when adjusting.
(4) For manual adjustment, it is also possible by the following
sequence.
1) Select white pattern of heat-run by pressing “POWER
ON”key on remote control for adjustment then operate
heat run longer than 15 minutes. (If not executed this
step, the condition for W/B may be different.)
2) Push “Exit”key.
3) Change to the AV mode by remote control.(Push front-
AV or Input key)
4) Input external pattern(85% white pattern)
5) Push the ADJ key two times (entering White Balance
mode)
6) Stick the sensor to the center of the screen and select
each items (Red/Green/Blue Gain and Offset) using
D/E(CH +/-) key on R/C.
7) Adjust R/ G/ B Gain using F/G(VOL +/-) key on R/C.
8) Adjust two modes (Cool and Warm)
(Fix the one of R/G/B and change the others)
9) When adjustment is completed, Exit adjustment mode
using EXIT key on R/C.
* CASE
First adjust the coordinate far away from the target value(x, y).
(1) x, y > target
1) Decrease the R, G.
(2) x, y < target
1) First decrease the B gain,
2) Decrease the one of the others.
(3) x > target, y < target
1) First decrease B, so make y a little more than the target.
2) Adjust x value by decreasing the R
(4) x < target, y > target
1) First decrease B, so make x a little more than the target.
2) Adjust x value by decreasing the G
- Standard color coordinate and temperature when using the
CA100+ or CA210 equipment
To check the Coordinates of White Balance, you have to
measure at the below conditions.
Picture Mode : User 1
XD : Manual –XD Contrast : Off, XD Colour : Off
(If you miss the upper condition, the coordinates of W/B can
be lower than the spec.)
Mode Color coordinate Temp ∆uv
XY
Cool 0.276±0.002 0.283±0.002 11,000K 0.000
Warm 0.313±0.002 0.329±0.002 6,500K 0.003

LGE Internal Use OnlyCopyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes - 12 -
** DDC Command set **
5. DDC command protocol
5.1. Signal TABLE
5.2. E2PROM Data Write
(1) Signal TABLE
LEN : 84h+Bytes
CMD : E8h
ADH : E2PROM Slave Address (A0,A2,A4,A6), Not 00h
(Reserved by BufferToEEPROM)
ADL : E2PROM Sub Address(00~FF)
Data : Write data
Delay : 20ms
(2) Command Set
* Purpose
1) EDID write : 16-byte by 16-byte, 8 order (128-byte)
write(TO “00 –7F”of “EEPROM).
2) FOS Default write : 14-mode data write
(SyncFlags, HPeriodH, HPeriodL, VtotalH, VtotalL,
SrcHTotalH, SrcHTotalL, SrcHStartH, SrcHStartL,
SrcVStartH, SrcVStartL, HsyncPhase).
3) Random Data write : write the appointment Address of
E2PROM.
(3) E2PROM Data Read
1) Signal TABLE
2) COMMAND SET
* Purpose : To read(84h) the appointment Address of E2PROM
by 128(80h)-byte
Adjustment
Aging On/Off
Input select
R GAIN
G GAIN
B GAIN
R GAIN
G GAIN
B GAIN
R GAIN
G GAIN
B GAIN
CSM mode
AUTO ADC
EEPROM Read
EEPROMWrite
CMD(HEX)
F3
F4
16
18
1A
16
18
1A
16
18
1A
F2
F1
E7
E8
ADR
00
00
00
01
02
00
00
00
00
VALUE
FF/00
00 - C0
00 - C0
00 - C0
00 - C0
00 - C0
00 - C0
00 - C0
00 - C0
00 - C0
00
01
02
0, 1, 2
00
data
detail
FF : ON / OO : OFF
0x10 : TV
0x20 : AV1
0x21 : AV2
0x40 : Component1
GAIN adjustment
CSM COOL
GAIN adjustment
CSM NORMAL
GAIN adjustment
CSM WARM
COOL
NORMAL
WARM
0: Offset adjustment
1: Gain adjustment
2: Offset and Gain adjustment
EEPROM read
EEPROM write
Delay 20m
VAL
EEPROM WRITE E8h 94 16-Byte Write
(84+n)h n-byte Write
Adjustment contents CMD(hex) LEN Details
128 Bytes
Delay 150ms
EEPROM READ E7 A0 0 0-Page 0~7F Read
80 0-Page 80~FF Read
A2 0 1-Page 0~7F Read
80 1-Page 80~FF Read
A4 0 2-Page 0~7F Read
80 2-Page 80~FF Read
A6 0 3-Page 0~7F Read
80 3-Page 80~FF Read
Adjustment contents CMD(hex) ADH(hex) ADL(hex) Details

- 13 - LGE Internal Use OnlyCopyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
TROUBLESHOOTING
AV in
Comp in
RGB in
(D/L)
AV out
CVBS IN
LINE OUT
LINE IN
LINE_MUTE
RF
(Tuner)
DISPLAY MODULE
HDMI TMDS351PAG
HDMI MUX
DDR MEM
SERIAL
FLASH
Mstar
Romeo
LGE6891CD
NTP3000A
Digital
Audio AMP
MAIN NVM
MC74HC4066
Audio SW
LM324
X4 AMP
EDID NVM DDC/HDP/CEC
TMDS(HDMI in) PART_I2C
SW_RESET
I2S OUT
LVDS
TMDS(HDMI in)
DDC/HPD
[HDMI MUX, direct JACK to MAIN IC]
DDC
AUDIO_SW LINE IN
LINE IN
Y/Pb/Pr IN
DSUB_DDC
x0.55
LINE_MUTE
LINE OUT
CVBS OUT x4
x0.55
LINE IN CVBS IN
SIF IN
TUNER_I2C
PART_I2C
HDMI_SEL

LGE Internal Use OnlyCopyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes - 14 -
1. No power
(1) Symptom
1) It is not discharged minutely from module.
2) Light does not come into the front LED.
(2) Check process
Plug in the power cord.
No
Yes
Is the power cord
plugged in?
Connect the cable to SC100
No
Yes
Are the line filter and
PSU connected?
Replace the fuse.
No
Yes
Is the fuse of PSU
normal? (F101)
Connect a cable P1100.
After all cables connect is removed to PSU, the
AC voltage marking is authorized on manual.
When ST-BY 5V is not operated. replace PSU.
No
Yes
Is it connected
that PSU and P1100
in Main B/D?

LGE Internal Use OnlyCopyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes - 15 -
2. 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 process
3. Unusual display from RF mode
Check the LCD Module
Replace the
Power board.
Does
minute discharge
at Module? Is the inverter
/ VaVs on?
Is output the normality
Low/High voltage except
Stand-by 5V?
Yes
No No
Is the link cable
normal?
Yes
Is the IC801’s
output normal?
Reconnect Panel line cable.
(HD : P403)
No
Replace the VSC.
No
Yes
Check the power.
Is
video output of the
Tuner normal? (Check
TU500_Pin13)
Is the
input voltage
normal?(Check
Pin3)
Is the I2C communication normal?
(Check Pin9, Pin10)
Yes
No Yes
Is the LVDS
Cable connected?
well
Yes
Change the IC(IC801)
Cable inserts well.
No
No
Check the Tuner.
No
Block A

LGE Internal Use OnlyCopyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes - 16 -
4. Unusual display from rear AV mode.
Yes
Is video input of
the A/V Jack normal?
(Check R8044) Check the input source.
Same as Block A.
No
5. Unusual display from component 2 model
Yes
Is video
input of the Component
Jack normal? (Check
R8030/32/33)
Check the input source.
Change IC801.
No

- 17 - LGE Internal Use OnlyCopyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Set on speaker
in menu.
Download the
EDID data.
Check the signal after
IC600 refer to circuit
diagram.
No No
No
Check the Tuner In/Out.
No
No
Check the Speaker
cable.
No
Replace IC600.
No
Replace IC801.
No
Yes
Yes
All input(mode)
is no sound.
Only HDMI is
no sound. Is the speaker cable normal?
Is the speaker
on it menu?
Yes
Only AV/COM2/PC
input is no sound. Is the output of IC600 normal?
Yes
Yes
Only RF is no sound.
Yes
Is IC801 operated
normality?
Yes
Replace IC601.
Replace Main B/D.
No
Is IC601 operated
normality?
Yes
6. No Sound
(1) Symptom
1) LED is green
2) Screen display but sound is not output.
(2) Check process

LGE Internal Use OnlyCopyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes - 18 -
RF
(TU500)
RGB
(SVC Only)
(JK104)
TMDS/DDC/HPD_SINK HDMI_SEL/HDMI_IIC
LGE6891DD
(IC801)
LGE6891DD
(IC801)
HDMI
(DTVOnly)
(JK301)
TMDS
Mux
TMDS/DDC/HPD_S/W
AV IN
(JK200)
MNT_OUT
(JK200)
LCD
(LVDS)
(P403)
LCD
(LVDS)
(P403)
TXCO[0:4] /TXCE[0:4] /TXCLKO/TXCLKE
NTP3000
Digital AMP
(IC600)
NTP3000
Digital AMP
(IC600)
COMP IN
(JK101)
IIC_DSUB
CVBS_VIN
COMP Y/Pb/Pr
TV_MAIN/MAIN_SIF
SIF AM_AUDIO
COMP_LR
MNT_LR_OUT SPK 2CH
/SPK_HOTEL
SWITCH
DUAL FET
SWITCH
DUAL FET
LVDS_PWR_12V/RL_ON +12V
24C64
EEPROM
DDC
HDMI_5V_DET(HPD)/HPD_MST
CVBS_L/RIN
MNT_VOUT(AMP : GAIN X 4) /MUTE_LINE
AMP
GAIN X 4
(IC601)
24C64
EEPROM
DDC
IIC_SYS
SECAM_L
DDR
(IC900)
DDR
(IC900)
MADR[ 0:11] MDATA[ 0:15]
SW_RESET / IIC_PART
I2S
MUTE_MAIN / AC_DET
AMP_MUTE_HOTEL
PSU
(P1100)
PSU
(P1100)
RL_ON/SELECT/ DIMMING/SYNC MNT_5V/AC_DET
/SC_RST
MX25L1605
SF-ROM(16M)
(IC803)
MX25L1605
SF-ROM(16M)
(IC803)
SPI_CZ/CLK
SPI_D
AUDIO_R
(IC300)
(IC302)
(IC802)
BLOCK DIAGRAM

- 19 - LGE Internal Use OnlyCopyright LG Electronics. Inc. All right reserved.
Only for training and service purposes
300 200
510
500
120
122
400
800
801
802
804
803 530
540
521
821
805 550
910
900
EXPLODED VIEW
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These
parts are identified by in the Schematic Diagram and EXPLODED VIEW.
It is essential that these special safety parts should be replaced with the same components as
recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
IMPORTANT SAFETY NOTICE
A2
LV1
A10

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.
0.1uF C1135
22uH
L1101
AZ1117H-ADJTRE1(EH11A)
IC1104
2
OUTPUT
3
INPUT 1ADJ/GND
2.7K R1126
READY
PANEL_STATUS
AZ1117H-ADJTRE1(EH11A)
IC1101
2
OUTPUT
3
INPUT 1ADJ/GND
DCDC_7.22V_PIP
22K
R1130
P_12V
402
1%
R1144
7.5K R1120
1.2K R1190
READY
+1.2V_VDDC_MST
0.1uF C1102
MP2355DN-LF-Z
IC1102
3
VIN
2
BST
4
LX
1
SS
5GND 6FB 7COMP 8RUN
+5V_MULTI
110
1% R1123
0.1uF C1101
10K R1189
READY
P_5V
47uF25V C1137
0.1uF C1140
P_16V
10KR1135
P_5V
AC_RST
0R1125
P_5V
10uF 16V C1107
0.01uF
C1103
RL_ON
10K R1133
10K R1134
2.2uF 25V C1125
DC_DIM
+5V_MULTI
0
READY
R1191
+2.5V_VDDM_MST
3.3K
1%
R1166
+5V_ST
365
1%
R1137
0.1uF C1115
0.1uF
C1136
0R1132
100uF
16V
C1110
AZ1117H-ADJTRE1(EH11A)
IC1103
2
OUTPUT
3
INPUT 1ADJ/GND
+5V_ST
12K R1110
100uF
16V
C1105
0.01uF C1144
+12V
4.7K R1122
NOT SHARP 32&52",AUO
P_12V
220uF
16V
C1138
0.1uF C1142
100uF
16V
C1149
0
R1115
SC4215ISTRT
IC1100
3
VIN
2
EN
4
NC_2
1
NC_1
5NC_3 6VO 7ADJ 8GND
P_5V
59K R1111
1uF
C1124
1uF 25V C1126
330 1% R1124
+5V_ST
100uF16V C1109 PANEL_ON
+5VST_MST
220uF
16V
C1100
100uF
16V
C1119
+5V_ST
0.1uF C1139
+12V
0 READY R1188
I_DIMMING DISP_EN
P_16V
10K R1128
51
5%
R1165
0.01uF C1150
RL_ON
100uF
16V
C1118
AC_DET
SAM2333
D1106
READY
+5V_MULTI
100uF16V C1128
0.1uF C1111
0.01uF C1106
47 R1102
1.6K R1131
2.2uF
25V C1116
+5VST_MST
0.1uF C1148
4.7K
R1138
0.47uF C1121
E_DIMMING
2700pF 50V C1113
MBRS190T3G 90V D1103
+5V_TUNER
0.47uF
C1114
NOT SHARP 52",AUO
P_16V
0.01uF C1108
+5V_ST
10K R1129
0.01uF C1146
100uF
16V
C1141
1K R1192
0.1uF C1112
+3.3V_MST
P_12V
10K R1184
MBW3216-501TF
L1100
+16V_NTP
RT1C3904-T112 Q1100
E
BC
2SC3875S Q1102 12
3
RT1C3904-T112 Q1107
E
BC
RT1C3904-T112 Q1106
E
B
C
SMAW200-24C
P1100
19
Power ON
14
GND
9
5V
4
GND
18
ACD
13
GND
8
GND
3
GND
17
Error out
12
5V
7
GND
2
16V
16
AGND
11
5V
6
12V
1
16V
20
Inverter ON
15
GND
10
5V
5
12V
21
A.Dim
22
PWM Dim
23
Select
24
SYNC
MBR230LSFT1G
30V
D1100
5.6K
R1107
18K R1106 33K
R1140
33K
R1141
2.2K R1152 2.2K
R1154
2.2K R1153
330
1%
R1194
USB
100uF
16V
C1151 USB
+5V_USB
AZ1117H-ADJTRE1(EH11A)
IC1107
USB
2
OUTPUT
3
INPUT 1ADJ/GND
0.1uF C1120
USB
110
1% R1195
USB
1/10W
100
5%
R1139-*1
PWM_DIM
1/10W
1K
5%
R1139
DC_DIM
0
R1163
S2A
D1102
50V
10uF C1152
4.7uF
C1117
10K
READY
R1196
0 SHARP 52",AUO R1197
0CMO 32,42,47
R1185
0
NOT (CMO 32,42,47,57, SHARP 32")
R1183 0CMO 57"
R1187
0 CMO 57"R1186
0
NOT CMO 57"
R1127
0
CMO 32,42,47,57
R1155
+5V_MULTI
0
R1105
0
NOT CMO 32,42,47,57
R1104
0
CMO 32,42,47,57
R1103
0.1uF C1154
100uF
16V
C1153
+5V_MULTI
MBW3216-501TF
L1103
USB
0.1uF
C1130
USB
1R1148 +3.3V_HDMI_SW
+3.3V_USB
22uF 16V
C1129
USB
+3.3V_SDRAM
0.1uF C1156
+3.3V
10uF16V C1133
TW9910 block
0.1uF
C1131
0.1uF C1147
47uF
16V
C1145
0.01uF C1132
0
R1149
+3.3V_MULTI_MST
47uF
16V
C1155
+1.8V
+12V
P_5V
EAM38769505 UBW2012-121F L1104
120OHM
READY
L1108
EAM38769505 UBW2012-121F L1105
L1107
UBW2012-121F
MBW3216-501TF
L1109
UBW2012-121F
120OHM
32 Sharp
L1110
UBW2012-121F
120OHM
NOT 32 Sharp
L1111
P_5V
VCC_LCD
AZ1117H-3.3
IC1105
2
OUTPUT
3
INPUT 1ADJ/GND
AZ1117H-3.3
IC1108
2
OUTPUT
3
INPUT 1ADJ/GND
0
5%
R1168
0
5%
R1170
OPT R1167
READY
OPT R1169
READY
AZ1117H-1.8TRE1(EH13A)
IC1106
2
OUTPUT
3
INPUT 1ADJ/GND
OPT R1150
READY
0
5%
R1151
0.1uF
C1122
0.1uF C1123
UBW2012-121F EAM38769505 L1106
MBW3216-501TF EAM30764101 L1112
0.01uF
C1134
22uF 16V C1104
SI4925BDY
EBK32753101
Q1101
3
S2
2
G1
4
G2
1
S1
5D2_1 6D2_2 7D1_1 8D1_2
+5VST_MST
+5V_USB
+12V
11 11
EAX40043809
POWER
MSTAR LP81A
MSTAR
OUT:2.6V
(8)
110mA
LED Block
12V->5V_TUNER
DC-DC CONVERTER
ST 5V->3.3V->1.2V
R1
SWITCH VCC_LCD:12V or 5V
OUT:1.25V
R2
equal to 220uF pad size
5V:5V_PULLUP,5V_MULTI
OUT:UNDER 7.22V
SWITCH 5V->3.3V->1.8V
20mA
SWITCH 5V->DDR 2.5V
MAX1A
MAX1A
MAX1A
R2
R1
R1
R1
R2
R2
V0 = 0.8(R1+R2) / R2
*Applied to SIF,HDMI,ADC,MPLL,AUD
*3.3V_NTP,TW9910,ETC.
*NTP.USB,TW9910
*12V AUDIO and PANEL
*SHARP 32" : DC DIMMING
R1122
Sharp 52"
AUO X
4.7K
O
R1197
CMO 32/42/47
O
O
CMO 57" XX
C1114
XR1127
X
XO
O
the Rest(w/CMO26")
O
O
X
4.7K
4.7K
0.47uF
X
0.47uF 0.47uF
X
R1183
O
O
X OR1155
O
X
X X
X
X X
R1185
O
R1103
O
OX
R1186
O
X
X X XX
X
R1187
O
X
X
X X X
O
X X O O
R1104
*PANEL OPTION
X
Sharp 32" XXX
XXO
XX
XX
2008/01/08
SCHEMATIC DIAGRAM
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only