LG 28MT45M User manual

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Internal Use Only
Printed in KoreaP/NO :
CHASSIS :
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
SERVICE MANUAL
MFL68127250 (1407-REV00)
28MT45M 28MT45M-PMP
LW45A
LED TV

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CONTENTS
CONTENTS .............................................................................................. 2
SAFETY PRECAUTIONS ......................................................................... 3
SERVICING PRECAUTIONS.................................................................... 4
SPECIFICATION ....................................................................................... 6
ADJUSTMENT INSTRUCTION ................................................................ 8
TROUBLE SHOOTING........................................................................... 12
BLOCK DIAGRAM.................................................................................. 21
EXPLODED VIEW .................................................................................. 22
SCHEMATIC CIRCUIT DIAGRAM ..............................................................

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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
0.15µF
To Instrument's
exposed
METALLIC PARTS
Good Earth Ground
such as WATER PIPE,
CONDUIT etc.
AC Volt-meter
When 25A is impressed between Earth and 2nd Ground
for 1 second, Resistance must be less than 0.1
*Base on Adjustment standard
IMPORTANT SAFETY NOTICE
SAFETY PRECAUTIONS

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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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SPECIFICATION
1. Application Range
This spec sheet is applied all of the TV used LW45A chassis.
2. Specication
Each part is tested as below without special appointment
1) Temperature : 25 ˚C ± 5 ˚C (77 ˚F ± 9 ˚F),
CST : 40 ˚C ± 5 ˚C
2) Relative Humidity : 65 % ± 10 %
3) Power Voltage : Standard input voltage
(100 V - 240 V ~, 50 / 60 Hz)
· Standard Voltage of each products is marked by models
4) Specication and performance of each parts are followed
each drawing and specication by part number in accord-
ance with BOM.
5) The receiver must be operated for about 5 minutes prior to
the adjustment.
3.Test method
1) Performance : LGE TV test method followed
2) Demanded other specication
- Safety : CE,IEC specication
- EMC : CE,IEC specication
NOTE : Specications and others are subject to change without notice for improvement.
4. General specication
4.1. Operating/Storage environment
4.2. RGB-PC
No. Item Specication Remarks
1 Supported Sync. Type Separate Sync.(RGB)
2 Operating Frequency Analog Horizontal 30 ~ 69 kHz 22MT44A /24MT44A/22MT44N/24MT44N
22MT45A /24MT45A/28MT45A/ 28MT45M
Vertical 56 ~ 61 Hz
3 Resolution Analog
Max 1920×1080 @ 60 Hz 22MT44A /22MT45A/22MT44N
Recommend 1920×1080 @ 60 Hz
Max 1366×768 @ 60 Hz 24MT44A/24MT44N
24MT45A/28MT45A/ 28MT45M
Recommend 1366×768 @ 60 Hz
1 Operating Environment Temp : 10 °C ~ 35 °C
Humidity : 20 % ~ 80 %
2 Storage Environment Temp : -10 °C ~ 60 °C non condensing
Humidity : 5 % ~ 90 % non condensing

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5. RGB Input ( PC )
No. Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed Remark
1 640*480 31.469 59.94 25.175
2 800*600 37.879 60.317 40.0
3 1024*768 48.363 60.0 65.0
4 1280*720 47.77 59.85 74.5
5 1152*864 54.34 60.05 80
6 1366*768 47.71 59.79 85.5
6. HDMI Input (DTV)
No Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed Remarks
1 720*480 15.73 59.94 13.500 SDTV, DVD 480I(525I)
Spec. out but display.2 720*480 15.75 60.00 13.514 SDTV, DVD 480I(525I)
3 720*576 15.625 50.00 13.500 SDTV, DVD 576I(625I) 50Hz
4 720*480 31.47 59.94 27 SDTV 480P
5 720*480 31.5 60.00 27.027 SDTV 480P
6 720*576 31.25 50.00 27 SDTV 576P
7 1280*720 44.96 59.94 74.176 HDTV 720P
8 1280*720 45 60.00 74.25 HDTV 720P
9 1280*720 37.5 50.00 74.25 HDTV 720P
10 1920*1080 28.125 50.00 74.25 HDTV 1080I
11 1920*1080 33.72 59.94 74.176 HDTV 1080I
12 1920*1080 33.75 60.00 74.25 HDTV 1080I
13 1920*1080 56.25 50.00 148.5 HDTV 1080P
14 1920*1080 67.432 59.94 148.350 HDTV 1080P
15 1920*1080 67.5 60.00 148.5 HDTV 1080P
16 1920*1080 27 24.00 74.25 HDTV 1080P
17 1920*1080 33.75 30.00 74.25 HDTV 1080P
18 1920*1080 26.97 23.97 74.25 HDTV 1080P
19 1920*1080 33.716 29.976 74.25 HDTV 1080P

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ADJUSTMENT INSTRUCTION
1. Application Range
This spec. sheet applies to LW45A Chassis applied TV all
models manufactured in TV factory
2. Specication
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 °C ± 5 °C of temperature and 65 % ± 10 % of relative
humidity if there is no specic designation.
4) The input voltage of the receiver must keep AC 100-240
V~, 50/60 Hz.
5) The receiver must be operated for about 5 minutes prior to
the adjustment when module is in the circumstance of over
15. In case of keeping module is in the circumstance of 0
°C, it should be placed in the circumstance of above 15
°C for 2 hours. In case of keeping module is in the circum-
stance of below -20 °C, it should be placed in the circum-
stance of above 15 °C for 3 hours.
[Caution]
When still image is displayed for a period of 20 minutes or
longer (Especially where W/B scale is strong. Digital pattern
13ch and/or Cross hatch pattern 09ch), there can some after-
image in the black level area.
3. Main PCBA Adjustments
3.1. ADC Calibration
- An ADC calibration is automatically adjusted from DFT-Jig
- If it needs to adjust manually, refer to appendix.
* ADC Calibration Protocol (RS-232)
Adjust Sequence
▪aa 00 00 [Enter Adjust Mode]
▪xb 00 60 [RGB Input (1024*768)]
▪ad 00 10 [Adjust 1024*768 RGB]
▪aa 00 90 End Adjust mode
3.2. EDID Download
3.2.1. Overview
- It is a VESA regulation. A PC or a MNT will display an
optimal resolution through information sharing without any
necessity of user input. It is a realization of “Plug and Play”.
3.2.2. Equipment
- Since EDID data is embedded, EDID download JIG, HDMI
cable and D-sub cable are not need.
3.2.3. Download method
- The EDID data is automatically saved.
3.2.4. EDID DATA
- 28MT45A/B(RGB-PC)
- 28MT45A/B (HDMI)
NO Item CMD
1
CMD
2
Data 0
Enter
Adjust MODE
Adjust
‘Mode In’
A A 0 0 When transfer the
‘Mode In’,
Carry the command.
ADC
adjust
ADC
adjust
A D 1 0 Automatically adjustment
** RGB-PC : 128Bytes
0123456789ABCDEF
0 00 FF FF FF FF FF FF 00 1E 6D C8 59 01 01 01 01
10 01 17 01 03 68 34 1D 78 EA 53 4D A3 56 4F 9E 26
20 0F 47 4A A1 08 00 01 40 45 40 61 40 71 40 81 00
30 81 C0 01 01 01 01 66 21 56 AA 51 00 1E 30 46 8F
40 33 00 3F 43 21 00 00 1E 00 00 00 FD 00 38 3D 1E
50 45 09 00 0A 20 20 20 20 20 20 00 00 00 FC 00 32
60 44 20 48 44 20 4C 47 20 54 56 0A 20 00 00 00 FF
70 00 0A 20 20 20 20 20 20 20 20 20 20 20 20 00 67
** HDMI : 256Bytes
0123456789ABCDEF
0 00 FF FF FF FF FF FF 00 1E 6D CA 59 01 01 01 01
10 01 17 01 03 80 34 1D 78 EA 53 4D A3 56 4F 9E 26
20 0F 47 4A 21 08 00 81 80 81 C0 71 40 B3 00 81 40
30 90 40 95 00 A9 C0 66 21 56 AA 51 00 1E 30 46 8F
40 33 00 09 25 21 00 00 1A 02 3A 80 18 71 38 2D 40
50 58 2C 45 00 09 25 21 00 00 1E 00 00 00 FD 00 38
60 3D 1E 45 0F 00 0A 20 20 20 20 20 20 00 00 00 FC
70 00 32 44 20 48 44 20 4C 47 20 54 56 0A 20 01 30
80 02 03 21 F1 4F 84 05 03 02 20 22 10 11 13 12 14
90 1F 07 16 01 26 11 07 50 09 7F 07 65 03 0C 00 10
A0 00 02 3A 80 18 71 38 2D 40 58 2C 45 00 09 25 21
B0 00 00 1A 01 1D 80 18 71 1C 16 20 58 2C 25 00 09
C0 25 21 00 00 9E 01 1D 00 72 51 D0 1E 20 6E 28 55
D0 00 09 25 21 00 00 1E 01 1D 80 D0 72 1C 16 20 10
E0 2C 25 80 09 25 21 00 00 9E 02 3A 80 D0 72 38 2D
F0 40 10 2C 45 20 09 25 21 00 00 1E 00 00 00 00 6F

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4. Final Assembly Adjustment
4.1. White Balance Adjustment
4.1.1. Overview
▪ W/B adj. Objective & How-it-works
(1) Objective: To reduce each Panel's W/B deviation
(2) How-it-works : When R/G/B gain in the OSD is at 192, it
means the panel is at its Full Dynamic Range. In order to
prevent saturation of Full Dynamic range and data, one of
R/G/B is xed at 192, and the other two is lowered to nd
the desired value.
(3) Adjustment condition : normal temperature
1) Surrounding Temperature : 25 °C ± 5 °C
2) Warm-up time: About 5 Min
3) Surrounding Humidity : 20 % ~ 80 %
4) Before White balance adjustment, Keep power on
status, don’t power off
* Adj. condition and cautionary items
(1) Lighting condition in surrounding area surrounding lighting
should be lower 10 lux. Try to isolate adj. area into dark
surrounding.
(2) Probe location: Color Analyzer (CA-210) probe should
be within 10cm and perpendicular of the module surface
(80°~ 100°)
(3) Aging time
1) After Aging Start, Keep the Power ON status during
5 Minutes.
2) In case of LCD, Back-light on should be checked
using no signal or Full-white pattern.
4.1.2. Equipment
(1) Color Analyzer: CA-210 (NCG: CH 9 / WCG: CH12 / LED:
CH14)
(2) Adj. Computer (During auto adj., RS-232C protocol is
needed)
(3) Adjust Remocon
(4) Video Signal Generator MSPG-925F 720p/204-
Gray(Model: 217, Pattern: 49)
* Color Analyzer Matrix should be calibrated using CS-1000
4.1.3. Equipment connection
4.1.4. Adjustment Command (Protocol)
(1) RS-232C Command used during auto-adj.
(2) Adjustment Map
RS-232C COMMAND Explantion
CMD ID DATA
wb 00 00 Begin White Balance adjustment
wb 00 ff End White Balance adjustment
(internal pattern disappears )
Adj. item Command
(lower caseASCII)
Data Range
(Hex.)
Default
(Decimal)
CMD1 CMD2 MIN MAX
Cool
R Gain j g 00 C0
G Gain j h 00 C0
B Gain j i 00 C0
R Cut
G Cut
B Cut
Medium
R Gain j a 00 C0
G Gain j b 00 C0
B Gain j c 00 C0
R Cut
G Cut
B Cut
Warm
R Gain j d 00 C0
G Gain j e 00 C0
B Gain j f 00 C0
R Cut
G Cut
Co l o r An al yzer
Co m p u ter
Pat t e rn Ge ner at o r
RRGB Cable S -2 32 C
RS-232C
RS-232C
Probe
Signal Source
* If TV internal pattern is used, not needed
DFT JIG

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4.1.5. Adj. method
*Auto WB calibration
1) Set TV in ADJ mode using P-ONLY key (or POWER ON
key)
2) Place optical probe on the center of the display
- It need to check probe condition of zero calibration
before adjustment.
3) Connect RS-232C Cable
4) Select mode in ADJ Program and begin a adjustment.
5) When WB adjustment is completed with OK message,
check adjustment status of pre-set mode (Cool, Medium,
Warm)
6) Remove probe and RS-232C cable.
▪ W/B Adj. must begin as start command “wb 00 00” , and n-
ish as end command “wb 00 ff”, and Adj. offset if need.
* LED White balance table
If Model is Polaris Model, G-gain x is applied.
(1) Cool Mode
1) Purpose : Especially G-gain x adjust leads to the lu-
minance enhancement. Adjust the color temperature
to reduce the deviation of the module color tempera-
ture.
2) Principle : To adjust the white balance without the
saturation, Adjust the G gain more than 172 ( If R
gain or G gain is more than 255 , G gain can adjust
less than 172 ) and change the others ( R/B Gain ).
3) Adjustment mode : mode – Cool
(2) Medium / Warm Mode
1) Purpose : Adjust the color temperature to reduce the
deviation of the module color temperature.
2) Principle : To adjust the white balance without the
saturation, Fix the one of R/G/B gain to 192 (default
data) and decrease the others.
3)Adjustment mode : Two modes – Medium / Warm
4.1.6 Reference
(White Balance Adj. coordinate and color temperature)
1) Luminance: 204 Gray, 80IRE
2) Standard color coordinate and temperature using CS-1000
(over 26 inch)
4.1.7. Reference
(White Balance Adj. coordinate and color temperature)
* The spec of color temperature and coordinate.
*Note : x,y coordinates are drifted about 0.007 after 30 mins
heat-run. So checking color coordinate within 5-min at total
assembly line, consider x,y coordinates might be up to 0.007
than x,y target of each color temperature.
5. Tool Option selection
▪ Method : Press "ADJ" key on the Adjustment remote control,
then select Tool option.
6. Ship-out mode check(In-stop)
▪ After nal inspection, press "IN-STOP" key of the Adjustment
remote control and check that the unit goes to Stand-by
mode.
7. GND and Hi-pot
7.1. GND & HI-POT auto-check preparation
1) Check the POWER CABLE and SIGNAL CABE insertion
condition
7.2. GND & HI-POT auto-check
1) Pallet moves in the station. (POWER CORD / AV CORD is
tightly inserted)
2) Connect the AV JACK Tester.
3) Controller (GWS103-4) on.
4) GND Test (Auto)
- If Test is failed, Buzzer operates.
- If Test is passed, execute next process (Hi-pot test).
(Remove A/V CORD from A/V JACK BOX)
5) HI-POT test (Auto)
- If Test is failed, Buzzer operates.
- If Test is passed, GOOD Lamp on and move to next
process automatically.
7.3. Checkpoint
1) Test voltage
- GND: 1.5KV/min at 100mA
- SIGNAL: 3KV/min at 100mA
2) TEST time: 1 second
3) TEST POINT
- GND Test = POWER CORD GND and SIGNAL CA-
BLE GND.
- Hi-pot Test = POWER CORD GND and LIVE & NEU-
TRAL.
4) LEAKAGE CURRENT: At 0.5mArms
8. Audio
Measurement condition:
1) RF input: Mono, 1 KHz sine wave signal, 100 % Modulation
2) CVBS, Component: 1 KHz sine wave signal 0.5 Vrms
3) RGB PC: 1 KHz sine wave signal 0.7 Vrms
Color
Temperature
Cool 9,300k °K X=0.274 (±0.03)
Y=0.278 (±0.03)
<Test Signal>
- Inner pattern
for W/B adjust
- External white
pattern
(80IRE, 204gray)
Medium 8,000k °K X=0.290 (±0.03)
Y=0.298 (±0.03)
Warm 6,500k °K X=0.318 (±0.03)
Y=0.334 (±0.03)
Luminance
(cd/m²)
Cool Min : 80 Typ : 110 <Test Signal>
Inner pattern
(204gray,80IRE)
Medium Min : 80 Typ : 110
Warm Min : 70 Typ : 110
No. Item Min Typ Max Unit Remark
1
Audio practical
max Output, L/R
(Distortion=10%
max Output)
4.5 5.0 6.0
W
Vrms
(1) Measurement condition
- EQ/AVL/Clear Voice: Off
(2) Speaker(8Ω Impedance)

- 11 - LGE Internal Use Only
Copyright © LG Electronics. Inc. All right reserved.
Only for training and service purposes
9. USB S/W Download(Service only)
1) Put the USB Stick to the USB socket.
2) Automatically detecting update le in USB Stick.
- If your downloaded program version in USB Stick is Low, it
didn't work. But your downloaded version is High, USB data
is automatically detecting.(Download Version High & Power
only mode, Set is automatically Download)
3) Show the message "Copying les from memory".
4) Updating is starting.
5) Updating Completed, The TV will restart automatically.
6) If your TV is turned on, check your updated version and
Tool option. (explain the Tool option, next stage)
* If downloading version is more high than your TV have, TV
can lost all channel data. In this case, you have to channel
recover. if all channel data is cleared, you didn’t have a DTV/
ATV test on production line.
* After downloading, have to adjust Tool Option again.
1) Push "IN-START" key in service remote control.
2) Select "Tool Option 1" and push "OK" key.
3) Punch in the number. (Each model has their number)
10. Optional adjustments
10.1. Manual ADC Calibration
■ Enter ‘EZ ADJUST’ mode by pressing ‘ADJ’ key.
■ Enter Internal ADC calibration mode by pressing ‘►’ or ‘OK’
key at ‘ADC Calibration’
→ Caution : Using ‘P-ONLY’ button of the Factory SVC remo-
con when turns TV on.
10.2. Manual White balance Adjustment
10.2.1. Adj. condition and cautionary items
(1) Lighting condition in surrounding area surrounding lighting
should be lower 10 lux. Try to isolate adj. area into dark
surrounding.
(2) Probe location: Color Analyzer (CA-210) probe should be
within 10cm and perpendicular of the module surface.(80°~
100°)
(3) Aging time
1) After Aging Start, Keep the Power ON status during 5
Minutes.
2) In case of LCD, Back-light on should be checked us-
ing no signal or Full-white pattern.
10.2.2. Equipment
(1) Color Analyzer: CA-210 (NCG: CH 9 / WCG: CH12 / LED:
CH14)
(2) Adj. Computer (During auto adj., RS-232C protocol is
needed)
(3) Adjust Remocon
(4) Video Signal Generator MSPG-925F 720p/216-Gray
(Model: 217, Pattern: 78)
10.2.3. Adjustment
(1) Set TV in Adj. mode using POWER ON
(2) Zero Calibrate the probe of Color Analyzer, then place it on
the center of LCD module within 10cm of the surface.
(3) Press ADJ key → EZ adjust using adj. R/C → White Bal-
ance then press the cursor to the right (KEY►). When
KEY(►) is pressed 216 Gray internal pattern will be
displayed.
(4) One of R Gain / G Gain / B Gain should be xed at 192,
and the rest will be lowered to meet the desired value.
(5) Adj. is performed in COOL, MEDIUM, WARM 3 modes of
color temperature.
▪ If internal pattern is not available, use RF input. In EZ Adj.
menu 6.White Balance, you can select one of 2 Test-pattern:
ON, OFF. Default is inner(ON). By selecting OFF, you can
adjust using RF signal in 216 Gray pattern.
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G
G G

- 12 - LGE Internal Use Only
Copyright © LG Electronics. Inc. All right reserved.
Only for training and service purposes
TROUBLE SHOOTING
1. NO POWER-Main PCBA
Is Adapter
Output VOLTAGE 19.4V
through of JK700?
NO POWER
Is 3.3V at C708?
Check waveform of X501
YES
NO
YES
NO
YES
check open or short at Line.
or change Adapter.
check the Lines of IC701,
If there is any problem at Line,
Change IC701
NO
Check Line short or open between
IC501 and X501,
Change IC501 or change X501
1
2
4
Is 1.8V at C745?
is 1.25V at C742?
3
YES
check the Lines of IC711,IC704
If there is any problem at Line,
Change IC704,IC706.
NO
Insert F/W
is 3.3V at 1pin of P120?
when push power key,
Is 0v at 2pin of P120?
Change control
Or check Line short or open of P120
5
is there any waver at 11pin of P120,
when use remote controller?
6
NO
YES
change IR board
Or check Line short or open of P120
NO
4
X501

- 13 - LGE Internal Use Only
Copyright © LG Electronics. Inc. All right reserved.
Only for training and service purposes
2. No raster (Power LED blue, black screen)
Is 19.4V at JK700?
NO RASTER
(Screen is not displayed)
Insert the F/W back
or REPLACE LCD MODULE
Is 1.25V at 4pin of IC704?
Is 1.8V at 2pin of IC711?
YES
NO
YES
Check Line short or open between
IC711/IC704 and IC501,
If there is any problem at Line,
Change IC711/IC704 or change IC501
NO
1
2
is 3V at 3pin of IC801?
YES
It is not over 3V at 1pin of IC801.
Change Q802.
Or check Line short or open between
R803 and 95pin of IC501.
Change IC 501.
4
3NO
check open or short at Line.
or change Adapter
is 12V at 1pin of P101?
If is not under 1.5V at R722,
change Q721 or check open and short
of Line among Q720 and Q721.
If is under 11V at L110,
Check open and short
Of line between L110 and P101.
NO
Put into LVDS cable completely?
LVDS cable have damage?
NO
If LVDS cable isn’t insulted enough,
Insult LVDS cable until locking hook.
If LVDS cable have damage,
Change LVDS cable
5YES
YES

- 14 - LGE Internal Use Only
Copyright © LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. Abnormal/No screen (All input)-Main PCBA
Put into LVDS cable completely?
LVDS cable have damage?
Abnormal/No screen
(all input)
Check waveform at signal
line of P101 (Clock:9,10
Data: 6,7,12,13,15,16,18,19)
YES
NO
YES
NO
YES
If LVDS cable isn’t insulted enough,
Insult LVDS cable until locking hook.
If LVDS cable have damage,
Change LVDS cable
1
Change module
WAVEFORMS
3
Is 12V at 1pin of P101?
If is not under 1.5V at R722,
change Q721 or check open and short
of Line among Q720 and Q721.
If is under 11V at L110,
Check open and short
Of line between L110 and P101.
2
3NO Check open and short
Of line between Q720 and P101.
Or Check LVDS cable have damage.
Another is change IC501.
6,7,12,13,15,16,18,19 Pin of 1201
(Data Line)

- 15 - LGE Internal Use Only
Copyright © LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. Abnormal screen (AV)-Main PCBA
Put into AV cable completely?
Abnormal screen (AV)
YES
NO
NO
Insult AV cable tight
1
Change IC501
WAVEFORMS
Is Input signal timing
and format in spec?
Change Timing to 480I, 576I
Or change format CVBS
2
Is waveform at R505
3Check Line between JK101 and IC501
is open or short, Another is
change AV cable
NO
YES
YES
R505 (CVBS)
3

- 16 - LGE Internal Use Only
Copyright © LG Electronics. Inc. All right reserved.
Only for training and service purposes
5. Abnormal screen (RGB PC)-Main PCBA
Put into RGB
cable completely?
Abnormal screen (RGB PC)
YES
NO
NO
insult RGB cable tight
1
Change IC501
WAVEFORMS
Is Input signal timing
and format in spec?
Change Timing according to
product spec, Or change format to RGB
2
Is waveform at R501
R502, R504
3Check Line between JK201 and IC501
is open or short, Another is
Change RGB cable
NO
YES
YES
3
R502(G) R604(R) R601(B)

- 17 - LGE Internal Use Only
Copyright © LG Electronics. Inc. All right reserved.
Only for training and service purposes
6. Abnormal screen (HDMI)-Main PCBA
Put into HDMI
cable completely?
Abnormal screen (HDMI)
YES
NO
NO
insulted HDMI cable
1
Change IC501
Is Input signal timing
and format in spec?
Change Timing according to
product spec, change f ormat
under 8 bit in Ycbcr, Ypbpr, RGB
2
Is waveform at 10,12pin
of JK203?
3
Check Line between JK203 and IC501
is open or short, Another is
Change HDMI cable
NO
YES
YES
Is waveform at 1,3,4,6,7,9pin
Of JK203?
YES
4
Check Line between JK203 and IC501
is open or short, Another is
Change HDMI cable
NO
Can read EDID and
HDCP key though
16,15pin of JK203
Check Line between JK203 and IC501
is open or short, Another is
Change HDMI cable
YES
Is 5V at 19pin of JK203?
Check Line between JK203 and IC501
is open or short, Another is
Change IC501 or HDMI cable
5
YES
6

- 18 - LGE Internal Use Only
Copyright © LG Electronics. Inc. All right reserved.
Only for training and service purposes
7. No sound (all source )-Main PCBA
Does wire connect P301 with speaker?
NO sound (All source)
YES
NO
YES
NO
YES
Connect wire between P301 and speaker.
1
Change speaker and wire
Is 19.4V at 19,20,31,32pin
of IC301 ?
If 8V is not plus at L703, check
of JK700 is open.
If is not Check Line between L703
and IC301 is open or short.
.Another is change IC301
2
NO
Is 3.3V at 40pin of IC301?
If 3V is not plus 30pin of IC301,
check It is over 3V at L301
if it is not, Check Line between L301
and IC301 is open or short.
Another is change IC701,IC301
NO
3
4
YES
Is I2C waveform at
10,11pin of IC301?
Check Line between IC301 and IC501
is open or short, Another is change
IC301 or IC501.
NO
5
Is I2S waveform at
R301,R302,R303,R304?
6
Check Line between IC301 and IC501
is open or short, Another is change
IC301 or IC501.
YES
Is there any waveform P301?
Check Line between IC301 and P301
is open or short. And then check resistance
of speaker is under 4ohm.
Another is change IC301
NO
4
10pin of IC301 11pin of IC301
5
R301(SDO) R302(WS) R303(SCK)
5
R304(MCLK)
6
1pin of P301(Audio out)

- 19 - LGE Internal Use Only
Copyright © LG Electronics. Inc. All right reserved.
Only for training and service purposes
8. Abnormal sound (AV)-Main PCBA
Put into AV cable completely?
Abnormal sound (AV)
YES
NO Insult AV cable tight
1
Change IC501
WAVEFORMS
Is waveform at C520,C521
2Check Line between JK101 and IC501
is open or short, Another is
change AV cable
NO
YES
C520,C521(audio in)
2

- 20 - LGE Internal Use Only
Copyright © LG Electronics. Inc. All right reserved.
Only for training and service purposes
9. Abnormal sound (HDMI)-Main PCBA
Abnormal sound (HDMI)
Put into HDMI
cable completely?
YES
NO
NO
insulted HDMI cable
1
Change IC501
Is Input signal timing
and format in spec?
Change Timing according to
product spec, change f ormat
under 8 bit in Ycbcr, Ypbpr, RGB
2
Is waveform at 10,12pin
of JK203?
3
Check Line between JK203 and IC501
is open or short, Another is
Change HDMI cable
NO
YES
YES
Is waveform at 1,3,4,6,7,9pin
Of JK203?
YES
4
Check Line between JK203 and IC501
is open or short, Another is
Change HDMI cable
NO
Can read EDID and
HDCP key though
16,15pin of JK203
Check Line between JK203 and IC501
is open or short, Another is
Change HDMI cable
YES
Is 5V at 19pin of JK203?
Check Line between JK203 and IC501
is open or short, Another is
Change IC501 or HDMI cable
5
YES
6