LG RZ-20LZ55C User manual

LCD TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : ML-041F
MODEL : 20HIZ12 RZ-20LZ55C
website:http://biz.LGservice.com
Internal Use Only

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 2 -
CONTENTS
CONTENTS .............................................................................................. 2
PRODUCT SAFETY ..................................................................................3
SPECIFICATION ........................................................................................6
ADJUSTMENT INSTRUCTION ...............................................................10
SVC REMOCON.......................................................................................11
HOTEL MODE..........................................................................................12
TROUBLE SHOOTING ............................................................................15
BLOCK DIAGRAM...................................................................................20
WIRING DIAGRAM ..................................................................................22
EXPLODED VIEW .................................................................................. 23
REPLACEMENT PARTS LIST ............................................................... 25
SVC. SHEET ...............................................................................................

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 3 -
SAFETY PRECAUTIONS
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the
Schematic Diagram and Replacement Parts List.
It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent
X-RADIATION, 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.
X-RAY Radiation
Warning:
To determine the presence of high voltage, use an accurate high
impedance HV meter.
Adjust brightness, color, contrast controls to minimum.
Measure the high voltage.
The meter reading should indicate
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1.5KV: 14-19 inch, 26
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1.5KV: 19-21 inch,
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1.5KV: 25-29 inch, 30.0
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1.5KV: 32 inch
If the meter indication is out of tolerance, immediate service and
correction is required to prevent the possibility of premature
component failure.
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
The source of X-RAY RADIATION in this TV receiver is the High
Voltage Section and the LCD PANEL.
For continued X-RAY RADIATION protection, the replacement
panel must be the same type panel as specified in the
Replacement Parts List.
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

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 4 -
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 500oF to 600oF.
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.
(500oF to 600oF)
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
(500oF to 600oF)
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

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 5 -
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.

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 6 -
1. Application range
This specification is applied to ML-041F chassis.
2. Requirement for Test
Testing for standard of each part must be followed in below
condition.
(1) Temperature: 25°C ± 2°C
(2) Humidity: 65% ± 10%
(3) Power: Standard input voltage (AC 100-240V, 50/60Hz)
(4) Measurement must be performed after heat-run more than
30min.
(5) Adjusting standard for this chassis is followed a special
standard.
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement .
3.General Specification
No. Item Content Remark
1 LCD Module Feature Maker LPL
Type TFT Color LCD Module
Active Display Area 20.1 inches(510.00) duaginal
Pixel Pitch [mm] 0.6375mm(H) x 0.6375mm(V) x RGB
Electrical Interface TTL LPL
Color Depth 8bits, 16,777,216 color
Size[mm] 450(H) x 3348.7(V) x 20(D)
Surface Treatment Glare, Hard Coating (3H)
Operating Mode Normally Black
Black Light Unit 6CCFL(6 lamps)
R/T Typ. 16ms(R.T : 7/10ms + F.T. : 18/20ms)

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 7 -
4. Feature and Function
5. Mechanical specification
No. Item Specification Remark
1 Teletext TOP, FLOF Top(option)
2 REMOCON NEC Code PAL/ NTSC
3 AV Input 1 Rear
4 S-Video Input 1 Rear
5 Component input X
6 PERI TV Connector Full SCART : 1 Rear
7 Ear-phone output 1
8 RJ-12 1
Only Commercial Model(SI-Box interface)
9 Discrete IR 1
10 2 Carrier Stereo BG, DK
11 NICAM Stereo BG, I, LL'
12 2 Carrier Dual BG, DK
13 NICAM Dual BG, I, LL'
14 DW(Double Window) Mode X
15 MW(Multi Window) Mode X
16 Film Mode X
17 Noise Reduction X
18 Progressive Scan 0
19 Motion Detection X
20 SRS WOW X
21 Swivel Speaker X
22 EZ-pip X
23 ARC X
24 DRP X
25 DCDI X
26 HDCP X
No Item Content Remark
1 Product Width (W) Length (D) Height (H)
Dimension Before Packing 597.5 222 460.6 With Stand
After Packing 702 288 547
2 Product Only SET 9.9kg
Weight With BOX 12 kg
6. Engineering Specification
No. ITEM Specification Remark
1 ENERGE SYNC(V/H) VIDEO POWER CONSUMPTION LED COLOR
Normal On/On Active ≤65W GREEN
Stand By, Off/Off Off ≤1W LED
Cut-off Switch off - - 0W OFF
PBP SWAP
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ON/OFF
ITEM Specification Remark

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 8 -
7. Outgoing Condition
No Item Condition Remark
1 Power Off
2 Volume Level 30
3 Main Picture Input TV
4 Main Last Channel Pr 01
5 Mute Off
6 APC Clear
7 Station Auto Program Manual Program
Program Edit
Favorite Program None
8 Picture PSM Dynamic
Dynamic Contrast 85
Brightness 60
Colour 70
Sharpness 70
Tint 0 NTSC OPTION
9 Sound SSM Flat
AVL Off
Balance 0
10 Special Input TV
Child Lock Off
Auto Sleep Off
Language English(Area Management)
8. Optical Character
No Item Specification Remark
LPL CMO AUO
1 Viewing Angle Right / Left 88/88 80/80 80/80
<CR
≥ 10> Up / Down 88/88 70/70 60/60
2 Luminance Luminance (cd/m2) 450 450 500 Typical
Variation 1.3 MAX / MIN
3 Contrast Ratio 350 500 500 All white / All black
4 CIE Color Coordinates White WX Typ. 0.289 0.285 0.31
WY Typ. 0.335 0.293 0.33
RED Xr Typ. 0.692 0.692 0.64
Yr Typ. 0.335 0.332 0.34
Green Xg Typ. 0.289 0.276 0.29
Yg Typ. 0.583 0.601 0.61
Blue Xb Typ. 0.143 0.142 0.14
Yb Typ. 0.909 0.075 0.07

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 9 -
9. Preset CH information
PIF[MHz] SYSTEM Video Sound TXT NAME
System Mode
LGE KUMI PR 0 45.25 PAL-BG PHILIPS MONO C 01
PR 1 575.25 SECAM-DK DIGITAL DUAL C 34
PR 2 175.25 PAL-BG PHILIPS STEREO FLOF C 05
PR 3 231.25 PAL-I FUBK MONO S 11
PR 4 675.25 NTSC-M DIGITAL MONO C 48
PR 5 62.25 SECAM-BG PHILIPS DUAL C 04
PR 6 189.25 PAL-BG Crosshatch NICAM DUAL FLOF C 07
PR 7 703.25 PAL-BG RGB, WHITE MONO C 50
PR 8 719.25 PAL-BG MATRIX C/B NICAM STEREO C 52
PR 9 631.25 PAL-I PHILIPS NICAM STEREO C 41
PR 10 807.25 PAL-I Crosshatch NICAM STEREO C 48
PR 11 102.25 PAL-BG RED MONO BLN2
PR 12 55.75 PAL-L Crosshatch MONO C 02
PR 13 152.75 PAL-L PHILIPS NICAM DUAL S 07
PR 14 591.25 PAL-L Colorbar NICAM STEREO C 48
LGEMA PR 31 175.25 PAL-B Crosshatch+Circle NICAM DUAL FLOF C 05
PR 32 711.25 PAL-G DIGITAL NICAM STEREO FLOF C 51
PR 33 631.25 PAL-I Crosshatch NICAM STEREO FLOF C 41
PR 34 93.25 SECAM-D DIGITAL MONO C 05
PR 35 62.25 PAL-B Crosshatch A2 STEREO C 04
PR 36 551.25 PAL-G Colorbar A2 DUAL TOP C 31
PR 37 471.25 PAL-I DIGITAL STEREO FLOF C 21
PR 38 855.25 PAL-I DIGITAL MONO FLOF C 69
PR 39 687.25 NTSC-M Crosshatch+Circle MONO C 50
PR 40 200.25 SECAM-L DIGITAL MONO C 08
PR 41 663.25 SECAM-L DIGITAL NICAM DUAL C 45
PR 42 503.25 PAL-B Crosshatch(16:9) MONO FLOF C 25
PR 43 687.25 NTSC-M DEM+Circle MONO C 50
PR 44 189.25 PAL-B STEREO C 07
PR 45 327.25 PAL-D A2 STEREO FLOF S 24
PR 46 615.25 PAL-B NICAM STEREO FLOF C 39

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 10 -
1. Application Object
This document is applied to 20" LCD TV which is
manufactured in Monitor Factory or is produced on the basis
of this data.
2. Designation
2.1 The adjustment is according to the order which is
designated and which must be followed, according to the
plan which can be changed only on agreeing.
2.2. Power Adjustment: Free Voltage
2.3. Magnetic Field Condition: Nil.
2.4. Input signal Unit: Product Specification Standard
2.5. Reserve after operation: Above 30 Minutes
2.6. Adjustment equipments: Pattern Generator (801GF,
MSPG925F), DDC Adjustment Jig equipment
3. Adjustment
3.1 Adjustment Details
The machine can be adjusted by itself automatically but
even for self -adjustment it needs someone to operate it.
3.2 Video signal Gain/Offset Adjustment
(Execute first of all in adjustment process)
3.2.1 Adjustment Preparation
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Execution of RF no signal during Heat Run over 30min
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Connect to the LCD TV SCART input terminal with Patten
Generator(MSPG-925FS)
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Convert INPUT MODE to AV1
3.2.2 Auto Gain/Offset Adjustment
(Input signal Level : 730mV)
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To use Pattern Generator(MSPG925FS), Apply Model :
202 PAL_BDGH, Patten 19 , white/black top and bottom
pattern signal (Don't apply 16 gray signal)
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Press IN-START Key by using the Remote
Controller(SVC), after converting to Adjustment-Mode,
press VOL+ Key consecutively in Auto-Gain Menu.
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After adjustment is complete, pressing enter key, stores
and completes the process.
3.2.3 Low Gray Adjustment
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@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
?
?
?
?
?
?
?
?
Apply Gray-Level(Model : 202 PAL_BDGH, pattern : 59)
signal by using Pattern Generator(MSPG-925FS)
?
?
?
?
?
?
?
?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
?
?
?
?
?
?
?
?
Check weather color-coordinates( x : 0.283, y : 0.298,
±0.005) is operated by using CA-110 equipment
?
?
?
?
?
?
?
?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
?
?
?
?
?
?
?
?
If color-coordinates is not in Spec, adjust color-
coordinates( x : 0.283, y : 0.298, ±0.005) by adjusting
Red Offset, Blue Offset
3.2.4 White Balance Adjustment
?
?
?
?
?
?
?
?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
?
?
?
?
?
?
?
?
Apply 95% White (Model : 202 PAL_BDGH, pattern : 47,
luminance spec : 250cd/m^2 over) signal by using Patten
Generator(MSPG925FS)
?
?
?
?
?
?
?
?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
?
?
?
?
?
?
?
?
Check whether color-coordinates( x : 0.283, y : 0.298,
±0.005) is operated by using CA-110 equipment
?
?
?
?
?
?
?
?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
?
?
?
?
?
?
?
?
If color-coordinates is not in Spec, adjust color-
coordinates(x : 0.283, y : 0.298, ±0.005) by adjusting
Red Gain, Blue Gain
?
?
?
?
?
?
?
?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
?
?
?
?
?
?
?
?
All adjustment takes color-coordinates with based on G,
changing R and B If it is not adjusted, adjust with fixed B,
changing G and R.
3.2.4 RJ-12 Jig Adjustment
?
?
?
?
?
?
?
?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
?
?
?
?
?
?
?
?
Locating the switch(sw110) at TV.
?
?
?
?
?
?
?
?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
?
?
?
?
?
?
?
?
Inserting the RJ-12 connector into the RJ-12 Jack.
- It'll be OK, if the Power LED is red.
?
?
?
?
?
?
?
?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
?
?
?
?
?
?
?
?
Checking IR behavior with a remote-controller.
- It'll be OK, if the IR LED is bright and consecutively the
OK LED is bright.
?
?
?
?
?
?
?
?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
@@@@@@@@@@@@g?
?
?
?
?
?
?
?
?
Checking the communication between a TV set and a
notebook pc by pushing the sw101.
- It'll be OK, if firstly TxD & RxD's LED light flicker and
soon the Power LED is green.
ADJUSTMENT INSTRUCTION

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 11 -
SVC REMOCON
NO KEY FUNCTION
REMARK
1 POWER
2 POWER ON
3 MUTE
4 P-CHECK
5 S-CHECK
6 ARC
7 CAPTION
8 TXT
9 TV/AV
10 TURBO SOUND
11 TURBO PICTURE
12 IN-START
13 ADJ
14 MPX
15 EXIT
16 APC(PSM)
17 ASC(SSM)
18 MULTIMEDIA
19 FRONT-AV
20 CH ±
21 VOL ±
22 ENTER
23 PIP CH-(OP1)
24 PIP CH+(OP2)
25 PIP SWAP(OP3)
26 PIP INPUT(OP4)
27 EYE
28 MENU
29 IN-STOP
30 STILL
31 TIME
32 SIZE
33 MULTI PIP
34 POSITION
35 MODE
36 PIP
37 TILT
38 0~9
To turn the TV on or off
To turn the TV on automatically if the power is supplied to the TV. (Use
the POWER key to deactivate): It should be deactivated when delivered.
To activate the mute function.
To check TV screen image easily.
To check TV screen sound easily
To select size of the main screen (Normal, Spectacle, Wide or Zoom)
Switch to closed caption broadcasting
To toggle on/off the teletext mode
To select an external input for the TV screen
To start turbo sound
To start turbo picture
To enter adjustment mode when manufacturing the TV sets.
To adjust the screen voltage (automatic) : In-start
?
?
?
?
?
?
?
?
?/X?f?
?V/Xf?
N)X?e?
?3)Xe?
?V@)X??
@@@@@@@@@@@@@@@@@@@@)??
?@(Me?
J(Y?e?
?W.Yf?
?.Y?f?
?
?
?
?
?
?
?
?
?
?
mute
?
?
?
?
?
?
?
?
?/X?f?
?V/Xf?
N)X?e?
?3)Xe?
?V@)X??
@@@@@@@@@@@@@@@@@@@@)??
?@(Me?
J(Y?e?
?W.Yf?
?.Y?f?
?
?
?
?
?
?
?
?
?
?
Adjust
?
?
?
?
?
?
?
?
?/X?f?
?V/Xf?
N)X?e?
?3)Xe?
?V@)X??
@@@@@@@@@@@@@@@@@@@@)??
?@(Me?
J(Y?e?
?W.Yf?
?.Y?f?
?
?
?
?
?
?
?
?
?
?
AV(Enter into W/B adjustment mode)
W/B adjustment (automatic) : After adjusting the screen
?
?
?
?
?
?
?
?
/Xf?
V/X?e?
?N1?e?
@Le?
@)X??
@@@@@@@@@@@@@@@@@@)??
@?e?
?J5?e?
W.Y?e?
.Yf?
?
?
?
?
?
?
?
?
W/B
adjustment
?
?
?
?
?
?
?
?
/Xf?
V/X?e?
?N1?e?
@Le?
@)X??
@@@@@@@@@@@@@@@@@@)??
@?e?
?J5?e?
W.Y?e?
.Yf?
?
?
?
?
?
?
?
?
Exit two times (Adjustment completed)
To enter into the adjustment mode. To adjust horizontal line and sub-brightness.
To select the multiple sound mode (Mono, Stereo or Foreign language)
To release the adjustment mode
To easily adjust the screen according to surrounding brightness
To easily adjust sound according to the program type
To check component input
To check the front AV
To move channel up/down or to select a function displayed on the screen.
To adjust the volume or accurately control a specific function.
To set a specific function or complete setting.
To move the channel down in the PIP screen.
To use as a red key in the teletext mode
To move the channel in the PIP screen
To use as a green key in the teletext mode
To switch between the main and sub screens
To use as a yellow key in the teletext mode
To select the input status in the PIP screen
To use as a blue key in the teletext mode
To set a function that will automatically adjust screen status to
match the surrounding brightness so natural color can be displayed.
To select the functions such as video, voice, function or channel.
To set the delivery condition status after manufacturing the TV set.
To halt the main screen in the normal mode, or the sub screen at the PIP screen.
Used as a hold key in the teletext mode (Page updating is stopped.)
Displays the teletext time in the normal mode
Enables to select the sub code in the teletext mode
Used as the size key in the PIP screen in the normal mode
Used as the size key in the teletext mode
Used as the index key in the teletext mode (Top index will
be displayed if it is the top text.)
To select the position of the PIP screen in the normal mode
Used as the update key in the teletext mode (Text will be
displayed if the current page is updated.)
Used as Mode in the teletext mode
To select the simultaneous screen
To adjust screen tilt
To manually select the channel.
Shortcut keys
Shortcut keys
Shortcut keys
Shortcut keys
Shortcut keys
Shortcut keys
Use the AV
key to enter
the screen
W/B
adjustment
mode.

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 12 -
HOTEL MODE
1. Hotel Option Configuration
When using the service remote control, press the In-Start key, and when using the user remote control, press the menu of
the local key and the menu of the user remote control simultaneously for 10 seconds to enter the service mode.
Press the menu key one more time with the service mode OSD displayed and move th the hotel option setup page to set up.
1.1. Channel Menu Display
- Decide to enter 'Channel Menu' or not in the 'Main Menu' by setting 'Channel Menu Display' as Yes(Enter Possible) or
No(Enter Impossible) on the "LG Hotel Mode" OSD.
1.2. Channel Change
- Decide to change channel or not by setting 'Channel Change' as Yes(Change Possible) or No(Change Impossible) when
present source is TV.
- When 'Channel Change' is set to No(Change Impossible), Channel Key, Numeral Key, List Key, Q.View Key doesn't work
and entering 'Channel Menu' in the Main Menu OSD is impossible.
- When 'Channel Change' is set to Yes(Change Possible), Channel Key, Numeral Key, List Key, Q.View Key does work and
entering 'Channel Menu' in the Main Menu OSD is possible.
- When 'Channel Change' is set to No(Change Impossible), 'Channel' item in 'On Time' menu will be fixed.
- When 'Channel Change' is set to No(Change Impossible), entering 'Channel Menu' in the 'Main Menu' OSD is impossible
regardless of 'Channel Menu Display' item.
Channel Menu Display YES
Channel Change YES
Input Mode Change YES
Flxed Volume NO
Max Volume 100
OSD Display YES
Remocon Operation YES
Local Key Operation YES
On Monitor Operation NO
Volume Off
30
Channel Off
1
Auto Off Operation YES
A/V Default Setting YES
Hotel Mode Operation YES
LG Hotel mode set up
OK
LG Hotel mode set up
OK

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 13 -
1.3. Input Source Change
- Decide to change input source or not by setting 'Input Source Change' as Yes(Change possible) or No(Change
impossible).
- When 'Input Source Change' is set to No(Change impossible), TV/AV key and Multimedia key doesn't work, and entering
'Input' item in the 'Main Menu OSD' is impossible.
- When 'Input Source Change' is set to No(Change impossible), user's input (pressing Channel key, numeral key, List key,
Q.View key in all Input source except TV source) doesn't work and when entering 'Channel Menu' item in the 'Main Menu
OSD' except TV mode doesn't accepted. Because entering 'Channel Menu' item makes present mode as TV mode even
though present mode is not TV mode. for the function that turns to TV mode doesn't work.
- When 'Input Source Change' is set to Yes(Change possible), then changing input source is available.
- When 'Input Source Change' is set to No(Change Impossible), TV set always turns on fixed input source and volume
information regardless of already set channel information.
- When 'Input Source Change' is set to No(Change Impossible), entering 'Channel Menu' except TV mode doesn't possible
regardless of 'Channel Change' or 'Channel Menu Display' item.
1.4. Fixed Volume
- Decide to fix volume or not by setting 'Fixed Volume' as Yes(Change possible) or No(Change impossible).
- When 'Fixed Volume' is set to Yes(Set), it fixed present volume and volume key doesn't work.
- When 'Fixed Volume' is set to Yes(Set), volume doesn't change during 'Mute On' but release mute.
- When 'Fixed Volume' is set to No(Not Set), user can change volume.
- In the case of both 'Fixed Volume' and 'On Time' is set to Yes(Set), but just the value is different, then Fixed Volume value
has priority.
- When 'Fixed Volume' is set to Yes(Set), user cannot select 'Max Volume' item.
- When 'Fixed Volume' is set to Yes(Set), 'On Time' menu's Volume item fixed to present volume.
1.5. Max Volume
- Decide 'Max Volume' between changing range 0 ~ 100.
- When 'Max Volume' is set, user can change up to set volume value.
- In the case of 'Fixed Volume' is set to Yes, 'Max Volume' item cannot be selected.
- When 'Max Volume' is set, volume just goes up to the 'Max Volume' value in 'On Time Menu'.
1.6. OSD Display
- Decide to display OSD or not by setting 'OSD Display' as Yes(Mark) or No(No Mark).
- When 'OSD Display' is set to No(No Mark), just Channel OSD and STEREO OSD doesn't display.
1.7. Remocon (Remote Control) Operation
- Decide to operate Remote Control or not by setting "Remocon Operation" as Yes(Work) or No(Do Not Work).
- When "Remocon Operation" is set to No(Do Not Work), all remocon key doesn't work include Power Key.
- When "Remocon Operation" is set to No(Do Not Work), In-start key and In-stop key still work.
- When "Remocon Operation" is set to No(Do Not Work), 'Remocon Operation' working in service mode is available.
- When "Remocon Operation" is set to Yes(Work), all Remocon keys work properly.
1.8. Local Key Operation
- Decide to operate 'Local Key' or not by setting "Local Key Operation" as Yes(Work) or No(Do Not Work).
- When 'Local Key Operation' is set to No(Do Not Work), all Local Key doesn't work include Power Key.
- When 'Local Key Operation' is set to No(Do Not Work), Local Key working in service mode is still available.
- When 'Local Key Operation' is set to Yes(Work), all Local Key working is available.
- When set both 'Local Key' and 'Remocon Operation' as No(Do Not Work), Power key of Remocon work as exceptional
case.
1.9. On Monitor Operation
- Decide to set Channel and Volume value or not those are displaying when Power On by setting 'On Monitor Operation' as
Yes(Work) or No(Do Not Work).
- When 'On Monitor Operation' is set to No(Do Not Work), user cannot enter inside of 'channel' and 'volume' item.
- When 'On Monitor Operation' is set to Yes(Work), user can enter inside of menu and set value.
- When 'Channel' item of 'On Monitor Operation' is set to No(Do Not Work), and 'On Monitor Operation' is set to Yes(Work),
then TV saves present input source and always turn on as the saved input source when turn on. If user enters Hotel Mode
as other input source that user wants (except TV mode), and set 'Channel' item as Yes(Work), then it will work.
- When 'On Monitor Operation' is set to No(Do Not Work), TV will be turned on as last memorized channel or input source.

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 14 -
1.10. Channel
- Decide to turn on TV as set channel or last memorized channel or not by setting 'Channel' as On(Work) or Off(Do Not
Work).
- When 'On Monitor Operation' is set to Yes(Work), then user can enter 'Channel' and set the value.
- When 'On Monitor Operation' is set to On(Work), setting 'Channel' value of ''On Monitor Operation' is possible and TV
always turns on as set 'Channel' value.
- When 'On Monitor Operation' is set to Off(Do Not Work), setting 'Channel' value of 'On Monitor Operation' is impossible and
TV turns on last memorized channel.
- If user wants to turn on by other Input source except TV, change Input source as you want and enter to 'Hotel Mode', then
select 'Channel' item as Off(Do Not Work) or Do Not select this item On(Work) from the beginning.
- In the case of both 'Channel' and 'On Time' is set, but just the value is different, then 'Channel' value has priority.
1.11. Auto Off Operation
- If there's no key input during 2 hours after turn on TV by 'Power On' function of the 'On Time', then turn off TV by 'Auto Off'
function of 'Time Menu'. This item decide to turn on TV by 'Auto Off Operation' regardless of 'Auto off' function of 'Time
Menu' or not by setting as Yes(Work) or No(Do Not Work).
- When 'Auto Off Operation' is set to Yes(Work), 'Auto Off Operation' work as configuration.
- When 'Auto Off Operation' is set to No(Do Not Work), 'Auto Off Operation' Do Not work regardless of configuration.
1.12. A/V Default Setting
- Decide whether to use default data or user data that are program, volume, picture, audio and ARC.
- Be selected Yes(Work) or No(Do Not Work).
- This item has lower priority than the 'On Monitor Operation' in hotel menu.
- When 'A/V Defualt Setting' is set to Yes(Work), TV will be turned on with default data.
- When 'A/V Defualt Setting' is set to No(Do Not Work), TV will be turned on with some values changed by last user or set
by you in hotel menu.
1.13. Hotel Mode Operation
- Decide to work all functions of 'Hotel Mode Operation' or not by setting 'Hotel Mode Operation' as Yes(Work) or No(Do Not
Work).
- When 'Hotel Mode Operation' is set to Yes(Work), all functions of Hotel Mode apply.
- When 'Hotel Mode Operation' is set to No(Do Not Work), all functions of Hotel Mode Do Not apply.
2. Initial Configuration and Configuration Detail
Setting Item Activated Deactivated Default
Channel Menu Yes No Yes
Channel Change Yes No Yes
Input Mode Change Yes No Yes
Fixed Volume Yes No No
Max Volume 0 ~ 100 100
OSD Display Yes No Yes
Remote Operation Yes No Yes
Local Key Operation Yes No Yes
On Monitor Operation Yes No No
Volume On Off Off
Volume Level 0 ~ 100 30
Channel On Off Off
Channel Number 0 ~ 99 1
Auto Off Operation Yes No Yes
Hotel Mode Operation Yes No No

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 15 -
TROUBLESHOOTING
No power
(LED indicator off)
Check short of main B/D
or Change Lips
Change IC1107, IC1104
Change LED Assy
Check 15V or 5V
of Lips
Check Output of
IC1107, IC104
Check LED Assy
Check P1100, P210 Connector
Fail
Fail
Change Q1100
Check Output of
Q1100 Fail
Pass
Fail
Pass
Pass
Pass
:[A]Process

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 16 -
No Raster
Check LED Status
on display unit
Check the input/
Output of IC901
Check L900,L901
L902,L903
Check inverter
Connector or inverter
Check input source cable and jack
Repeat A PROCESS
Fail
Change L900,L901,
L902,L903
Fail
Change IC901
Fail
Change inverter
connector or inverter
Fail
Change panel link
cable or module
Fail
Change module
Fail
Check panel link
Cable or module
Pass
Pass
Pass
Pass
:[B]Process

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 17 -
No Raster on Component signal
Check JA1200 or
RCA CABLE
Check the signal of
L1200, L1202, L1203
Repeat
[A] Process
Check the input/
output of IC1
Check the input/
output of IC901
Check input source cable and jack
Fail
Re-soldering or
Change the defect part,
Check X11
Fail
Re-soldering or
Change the defect part,
Check X900
Fail
Pass
Pass
Pass
Check the input/output
of IC800, IC851
Re-soldering or
Change the defect part
Fail
Pass

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 18 -
No Raster on AV Signal
(Video, S-Video) No Raster on TV(RF) signal
Change L1209, L1210,
L1212
Check the signal of
L1209, L1210, L1212
Repeat
[A] Process Check the output of
TU1000
Check the input/output
of IC1
Check the input/output
of IC800, IC851
Check input source cable and jack
Fail
Fail Fail
Fail
Re-soldering or
Change the defect part
Chek X11
Fail
Re-soldering or
Change the defect part
Check 5V, 33V of TU1000
Re-soldering or
Change the defect part
Pass
Pass
Pass
Check the input/output
of IC901 Fail
Re-soldering or
Change the defect part
Check X900
Pass
Pass

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 19 -
No Sound
Check the speaker wire
Change source input
Check the
input source Fail
Pass
Re-soldering or
Change the defect part
Check X11
Check the input/output
of IC1 Fail
Pass
Re-soldering or
Change the defect part
Check the input/output
of IC100,IC101 Fail
Pass
Change speaker
Check the speaker
Fail
Pass