LG 20LC1R-ZG User manual

LCD TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : CL-81
MODEL : 20LC1R-ZG
website:http://biz.LGservice.com
e-mail:http://www.LGEservice.com/techsup.html

- 2 -
CONTENTS
CONTENTS .............................................................................................. 2
PRODUCT SAFETY ..................................................................................3
DISASSEMBLY..........................................................................................6
SPECIFICATION........................................................................................7
ADJUSTMENT INSTRUCTION ...............................................................12
SVC REMOCON ......................................................................................14
TROUBLE SHOOTING............................................................................15
BLOCK DIAGRAM...................................................................................19
WIRING DIAGRAM..................................................................................21
EXPLODED VIEW .................................................................................. 22
REPLACEMENT PARTS LIST ............................................................... 24
SVC. SHEET ...............................................................................................

- 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
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

- 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

- 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.

- 6 -
DISASSEMBLY
#1 #2 Detached stand assy (Remove the screws)
#3 Disassembly stand assy #4 Detached Backcover (Remove the screw)
#5 Open the Backcover's latch with jig #6 Unlock latch between Cabinet and Backcover

- 7 -
SPECIFICATION
1. Application range
This specification is applied to CL-81 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.
3.General Specification
4. Mechanical Specification
No. Item Specification Remark
1TFT Color LCD Module
20.1 inches(510.54mm) diagonal
0.2125mm(H)x0.6375mm(V)xRGB
TTL
8BIT, 16,777,216 colors
432(H) x 331.5(V) x 25(D)
Anti-Glare, Hard Coating(3H)
Normally Black
6 CCFL(6 lamps)
25ms(R.T.:12ms + F.T.:13ms)
LPL
NOTE : Specifications and others are subject to change without notice for improvement
.
No.
1 Product Width(W) Lengh(D) Height(H)
Dimension Before Packing 492.4 272.8 483.3
After Packing 574.0 225.0 627.0
2 Product Only SET 8.7Kg
Weight With BOX 11.1Kg
Type
ActiveDisplay Area
Pixel Pitch [mm]
Electrical Interface
Color Depth
Size [mm]
Surface Treatment
Operating Mode
Back light Unit
R/T Typ.
Item Content Remark

- 8 -
6.Optical Character
Item RemarkSpecification
Viewing Angle
<CR 10>
Luminance
Contrast Ratio
CIE Color Coordinates
All White/All Black
In AV Input
PSM : Dynamic
White
(100 IRE)
R/L,
U/D
Luminance(cd/ )
Variation
CR
Typ
88/88
88/88
450
350
0.313
0.329
0.283
0.298
0.274
0.286
Min
85/85
85/85
380
280
0.283
0.299
0.253
0.268
0.244
0.256
WHITE
(Warm)
WHITE
(Normal)
WHITE
(Cool)
Wx
Wy
Wx
Wy
Wx
Wy
Max
1.3
0.343
0.359
0.313
0.328
0.304
0.316
No.
1
2
3
4
5. Reference table-Function
No. Item Specification Remark
1 Teletext TOP, FLOF TOP(option)
2 REMOCON NEC Code PAL
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 2 Carrier Stereo BG, DK
9 NICAM Stereo BG, I, LL'
10 2 Carrier Daul BG, DK
11 NICAM Daul BG, I, LL'
12 DW(Double Window) Mode X
13 MW(Multi Window) Mode X
14 Film Mode X
15 Noise Reduction X
16 Progressive Scan O
17 Motion Detection X
18 SRS WOW X
19 Swivel Speaker X
20 EZ-pip X
21 ARC X
22 DRP X
23 DCDI X
24 HDCP X

- 9 -
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 Station Auto Program
Manual Program
Program Edit
Favorite Program None
7 Picture PSM Dynamic
CSM Normal
Dynamic Contrast 100
Brightness 50
Colour 70
Sharpness 50
Tint 0 NTSC OPTION
8 Sound SSM Flat
AVL Off
Balance 0
9 Special Input TV
Child Lock Off
Power Indicator On
Language English(Area Management)
10 Time Clock -- : --
Off Time -- : -- Off
On Time -- : --
Pr. 1
Vol. 30
Off
Auto Sleep Off

- 10 -
8-1.General Specification
8.Engineering Specification
1
2
3
Power Supply
Normal
Stand By
Cut-off Switch off
ITEM
D-SUB Pin Configuraion
Control Function
H/V Sync
On/On
Off/Off
-
Spectification
1: RED
3: Blue
5: S.T(GND)
7: Green GND
9: N.C
11: ID0(GND)
13: H-Sync
15: SCL
1) Contrast/Brightness/Colour/Sharpness/(Tint)
2) Power On/Off, Input select, Menu, OK
Volume( ,), PR( , )
2: Green
4: ID2(GND)
6: RED GND
8: Blue GND
10: D-GND
12: SDA
14: V-Sync
Shell: GND
Remark
For SVC Only
Video
Active
Off
-
Power Consumption
≤
65W
≤
1W(110V)
≤
1W(220V)
0W
Item Specification Remark
No.
LED Color
BLUE
ORANGE
OFF

- 11 -
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
LGEWA PR 61 45.25 PAL-BG Monoscope MONO FLOF C 01
PR 62 575.25 PAL-DK Monoscope NICAM STEREO FLOF C 34
PR 63 175.25 PAL-BG SMPTE MONO C 04
PR 64 231.25 PAL-I Colorbar NICAM DUAL S 11
PR 65 62.25 PAL-BG White Raster MONO C 04
PR 66 189.25 SECAM-DK Monoscope MONO FLOF C 07
PR 67 703.25 SECAM-DK White Raster MONO C 50
PR 68 719.25 PAL-BG Crosshatch+Circle MONO C 52
PR 69 591.25 SECAM-L Colorbar NICAM STEREO C 36
LGENT PR81 67.25 Color Bar 400Hz
TXT, V-CHIP US-4
PR82 211.25 NTSC Philips 1Khz US-13
PR83 471.25 Monoscope Sweep US-14
PR84 175.25 Philips 1Khz E-5
PR85 503.25 PAL-B/G Color Bar(2) Ger,Stereo 1K,3Khz FLOF E-25
PR86 623.25 Monoscope Sweep G-40
PR87 49.75 SECAM D/K Color Bar(2) 400Hz D-1(CIS)
PR88 200.25 PAL-D/K Color Bar Sweep
D-10(China 10)
PR89 695.25 Philips CHI Dual 1K, 3Khz FLOF K-36

- 12 -
1. Application
This document is applied to 20.1" 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 (MSPG-925L
or Equivalent), DDC Adjustment Jig equipment, SVC
remote controller
3. Adjustment
In order to enter to IIC_SW, press IN-START key by
using SVC remote controller and press VOL+ at 'ETC',
after then, locate menu bar on 'IIC_SW' menu and
change 0 or 1 by using VOL+ or VOL- Key.
-IIC_ SW "1" : Factory default (Shipping condition),
DDC Communications(DDC2B)
- IIC_ SW "0": ADC calibration with auto adjustment
equipment.
*Menu(Local Key) + Menu(Remote controller:
6710T00022D) => Enter SVC Mode
3.1 Board Assembly line process
The machine can be adjusted by itself automatically but
even for self -adjustment it needs someone to operate it.
3.1.1 ISP Process ; UOC file
(Main board check process)
At first, APC after manual inserting and inspection.
And ISP needs to check main board Ass'y.
3.1.1.1 Required Equipment
JIG for ISP or ( ISP JIG for SVC and LIPS )
PC that is installed with "WISP" program.
Control + Power LED PCB Ass'y
3.1.1.2 ISP Sequence
1) Connect main board with JIG for ISP
2) Execute "WISP" Program.
3) Compare UOC version with version of hex file.
4) Push "Brouse..." button and select hex file.
5) Push " Auto Execute" button.
6) Occur an Error, try again and again. 2)~5)
3.1.2 ADC Process (Board Adjustment line process)
1) Auto Gain/Offset Adjustment
Convert to AV in Input-Mode
Signal equipment displays 0.7V, 16 Step Gray pattern.
(Model:202, Pattern: 29 at MSPG925L)
- Output Voltage : 700 mVp-p
- Impress Resolution 576i and gray pattern that
left & right is black and center is white signal
which follows in the MSPG925L.
Adjust by commanding AUTO_COLOR_ADJUST
(0xF1) 0x00 0x00 instruction.
2) Confirmation : Adjustment process
We confirm whether "0x01" address of EEPROM
"0xA0" is "0xAA" or not.
If "0x01" address of EEPROM "0xA0" isn't "0xAA", we
adjust once more in adjustment line by adjust method
of 1).
We can confirm the ADC values from "0x0C~0x11"
addresses in a page "0xA0"
3.1.3 DCXO Adjustment
3.1.3.1 DCXO Adjustment :
Convert to AV in Input-Mode
Signal equipment displays 0.7V, 8 Step color pattern.
(Model:202, Pattern: 38 at MSPG925L)
- Output Voltage : 700 mVp-p
- Impress Resolution 576i and Color pattern which
follows in the MSPG925L.
Adjust by commanding AUTO_DCXO (0xFC) 0x00 0x00
instruction.
* Caution*
If DDC CMD do n't work, please check below.
1. Enter SVC menu by SVC Remote controller
2. Enter "ETC" menu
Check please, IIC_SW is "0" or "1".
- IIC_SW "0" : ADC calibration with auto adjustment equipment..
-IIC_SW "1" : Factory default (Shipping condition), DDC
Communications(DDC2B).
3.1.4 Function Check
IIC_SW should set to "1"
Check DDC communications (DDC2B)
Check display and sound (cf. work instructions)
Check Input and Signal items.
1. TV
2. AV1 (SCART)
3. AV2 (CVBS/ S-Video)
4. Speaker & H/P Output
**After Fuction Check , IIC_SW should set to "0"
ADJUSTMENT INSTRUCTION

- 13 -
3.2 Total Assembly line process
3.2.1 Adjustment Preparation
IIC_SW should set to "0"
Above 30 minutes H/run in RF no signal
3.2.2 Confirmation of Luminance
Set Statement
Input : AV2
PSM : Dynamic
CSM : Normal
Signal equipment displays
Output Voltage : 700 mVp-p
Output Mode : Full White pattern
Confirm whether luminance is over 350 cd/m2 or not
3.2.3 Confirmation of Color Coordinate
Input Full White Pattern (AV2-CVBS)
Set CSM : Normal (9300K)
Confirm whether x=0.283±0.03, y=0.298±0.03 or not
* After Confirming color coordinate and luminance, IIC_
SW should set to "1"
3.2.4 Other quality
Confirm that each items satisfy under standard
condition that was written product spec.
- Confirm Video and Sound at each source
1) AV
- Select input AV1 and whether picture is displayed or
not
: SCART output displayed or not
- Select input AV2 (CVBS) and whether picture is
displayed or not
- Select input AV2 (S-video) and whether picture is
displayed or not
2) TV
Select input TV and check below item
1) In Gumi Factory
- C05 (E05) - TELETEXT Function Check
;(Applicable to the model that has Teletext
code set-up item in Product spec)
- C07 (E07) - Nicam DUAL Check
- C 52 (E52) - Nicam Stereo Check
*Preset CH information*
3.2.5 Stand by operation confirmation :
Check if Power LED Color and Power Consumption
operates as standard.
Measurement Condition : 230V@ 50Hz (Analog)
3.3 Option configuration
Press IN-START Key by using the SVC Remote
Controller and Press option value, after then, configure
the option data that is written in the product spec and
press MENU key.
After option configuration is complete, Press VOL+ at all
reset menu
Amber LED is blink. And then Automatically turn off. .
(Must not AC OFF during blink)
3.4 OPTION DATA SETTING(SVC OSD SETTING)
No Item
Condition Remark
Option1
1 ACMS Yes
2 TEXT FLOF TOP / FLOF
3 CH+AU NO NO : Except below area
YES : China, Australia
4 AGC-L NO
Option2
1 A2 ST NO
2 I II SAVE NO
3 V-Curve
Option3
1 Default Lang 0 According to Suffix
2 Lang Group 1 1: English /Germany/France/Italy/Spain
/Nederland/Sweden/Norway/Denmark
/Finland/Portugal/Romania/Poland
/Hungary/Czech/Russia
2: English / CHINA
3: English /ARAB
4: English /PARSI
3 TXT Lang 0 0 : West EU
(E,GER,SWE,ITA,FRE,SPA,TUR)
1 : East EU
(POL,GER,ESTO,SLOV,CHEC,RUMA)
2 : Cyrillic
(POL,GER,ESTO,LETT,RUSS,SLOV)
3 : Cyrillic2
(POL,GER,SWE/HUNG,RUSS,CHEC,Slov,ESTo)
4 : Arabic (E,FREN,TURK,ARAB)
Option4
1
2 hour Off Opt Yes
2
Navigation Key No
3 Favorite key No

- 14 -
SVC REMOCON
NO. KEY FUNTION REMARK
1 POWER To turn the TV on or off
2 MUTE To activate the mute function.
3 P-CHECK To check TV screen image easily. Shortcut keys
4 S-CHECK To check TV screen sound easily Shortcut keys
5 ARC(23inch) To select size of the main screen Shortcut keys
(Auto, 4:3, 16:9, 14:3, Zoom, Cinema Zoom)
6 CAPTION Switch to closed caption broadcasting
7 TXT To toggle on/off the teletext mode
8 TV/AV External input
9 IN-START To enter adjustment mode when manufacturing the TV sets.
Use the AV key to
In-Start Vol±
Auto ADC Vol± W/B adjustment enter the screen W/B
Exit two times(Adjustment completed) adjustment mode.
10 MPX To select the multiple sound mode
(Mono, Stereo or MPEG, DOLBY, Digital)
11 EXIT To release the adjustment mode
12 APC(PSM)
To easily adjust the screen according to surrounding brightness
13 ASC(SSM) To easily adjust sound according to the program type
14 MULTIMEDIA External input Shortcut keys
15 CH ±
To move channel up/down or to select a functiondisplayed on the screen.
16 VOL ± To adjust the volume or accurately control a specific function.
17 ENTER To set a specific function or complete setting.
18 CH-(OP1) To use as a red key in the teletext mode
19 CH+(OP2) To use as a green key in the teletext mode
20 SWAP(OP3) To use as a yellow key in the teletext mode
21 INPUT(OP4) To use as a blue key in the teletext mode
22 MENU
To select the functions such as video, voice, function or channel.
23 IN-STOP
To set the delivery condition status after manufacturing the TV set.
24 HOLD
Used as a hold key in the teletext mode (Page updating is stopped.)
25 TIME Displays the teletext time in the normal mode
Enables to select the sub code in the teletext mode
26 SIZE Used as the size key in the teletext mode
27 INDEX Used as the index key in the teletext mode
(Top index will be displayed if it is the top text.)
28 UPDATE Used as the update key in the teletext mode
(Text will be displayed if the current page is updated.)
29 MODE Used as Mode in the teletext mode
30 TILT To set IIC SW "0" or "1" in the adjustment mode
31 0~9 To manually select the channel.

- 15 -
TROUBLESHOOTING
No power
(LED indicator off)
Check short of main B/D
or Change Lips
Change U406
Change LED Assy
Check 15V or 5V
of Lips
Check Output of
U406
Check LED Assy
Check J103, J125, J126
Connector
Fail
Fail
Change Q402
Check Output of
Q402 Fail
Pass
Fail
Pass
Pass
Pass
:[A]Process

- 16 -
No Raster
Check LED Status
on display unit
Check the input/
Output of U301
Check
U401~U405, U407, U409
Check inverter
Connector or inverter
Check input source cable and jack
Repeat A PROCESS
Fail
Change U401~U405,
U407, U409
Fail
Change U301
Fail
Change inverter
connector or inverter
Fail
Change panel link
cable or module
Fail
Check panel link
Cable or module
Pass
Pass
Pass
Pass
Pass
:[B]Process

- 17 -
No Raster on AV Signal
(SCART, CVBS, S-VHS) No Raster on TV(RF) signal
Change L108, L109,
L110, L112, R194, R198,
R184
Check the signal of
L108, L109, L110, L112
R194, R198, R184
Repeat
[A] Process Check the output of
TU701
Check the
input/output of U301
Check the
input/output of U101
Check input source cable and jack
Fail
Fail Fail
Fail
Re-soldering or
Change the defect part
Check X301
Fail Re-soldering or
Change the defect part
Check 5V, 33V of TU701
Re-soldering or
Change the defect part
Pass
Pass
Pass
Pass

- 18 -
No Sound
Check the speaker wire
Change source input
Check the
input source Fail
Pass
Re-soldering or
Change the defect part
Check X301
Check the input/output
of U301 Fail
Pass
Re-soldering or
Change the defect part
Check the input/output
of U201 Fail
Pass
Change speaker
Check the speaker Fail
Pass

- 19 -
BLOCK DIAGRAM

- 20 -
BLOCK DIAGRAM DESCRIPTION
Power Supply Block (LIPS)
This Block Generates DC Voltage (5V,15V) to Main
Control system from AC Power (100-240 V, 50/60 Hz,
1.0A)
Also it has the inverter function that converts input
voltage to AC Rms value for the LCD lamp.
DC/DC Converter block
DC/DC Converter convert the input 5V,15V to proper
3.3V, 5V, 8V, 12V for Main control system.
For shooting heat trouble, we use the DC/DC
converting IC
Audio Amplifier
This block is composed of TPA3005D2 and peripheral
device.
The function of the audio amplifier is that to amplify
audio L / R signal transmitted from audio decoder. The
audio signal is amplified according to pre-defined DC
volume control curve.
Audio / Video / IF Decoder / Scaler
This block is composed of LOC1 and peripheral
devices.
1) Video Decoder
This Block Selects input Video signals (like CVBS, Y/C,
SCART RGB) and output RGB signal.
On decoding, We can control signal like Contrast,
Brightness, Sharpness, Color, tint signals including
Adaptive Comb Filter
2) Audio Decoder
This block analyzes audio input signal through A/V Jack
and PC audio and Tuner IF.
The analyzed signals transmitted to audio amplifier
On decoding, We can control signal like Bass, treble.
3) IF Decoder
This block can change IF signal to audio and video
signal that transmitted to Video/audio decoder.
4) Scaler
This IC includes A/D Converter and LVDS Transmitter
This IC is directly Inputted Analog Signal and transmits
it to LCD Module
5) Micom
This block controls each IC through IIC communication
line.
LVDS Rx (DTC34LF86L)
It is composed of DTC34LF86L/THC63LVDF84B.
The LVDS Rx converts the LVDS data streams back
into 24bits of CMOS/TTL data with
Falling edge or rising edge clock for convenient with
variety of LCD panel controllers.
Switch IC (PI3V512QE)
It is composed of PI3V512QE.
This IC selects between D-sub RGB signal and LOC1
RGB signal, and it transmits the selected signal to
video signal processor.
TUNER
Micom controls this through IIC Line.
TUNER makes IF and transmits IF signal to LOC1.