LG 20HIZ20 User manual

R
LCD TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : LP69F
MODEL : 20HIZ20 20LS1RH-ZK
website:http://biz.LGservice.com

- 2 -
CONTENTS
CONTENTS .............................................................................................. 2
PRODUCT SAFETY ..................................................................................3
SPECIFICATION ........................................................................................6
ADJUSTMENT INSTRUCTION .................................................................9
TROUBLE SHOOTING ............................................................................13
BLOCK DIAGRAM...................................................................................17
EXPLODED VIEW .................................................................................. 20
REPLACEMENT PARTS LIST ............................................................... 22
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 circuit
borad 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 -
SPECIFICATION
1. General Specification
NOTE : Specifications and others are subject to change without notice for improvement .
NO Item Content Remark
1 User Model Name 20LS1RH-ZK : PAL/SECAM (EU)
2 Feature 20.1” LCD TV
3 Chassis Name LP 69F
4 General Scope External SW PR(D/E), VOL(F/G), OK, MENU, INPUT, POWER 8Keys
& Adj.
5 Power Cord Length : 1.87±0.05 M NATION
Shape : Wall-out,
Color : BLACK
6 Power Adapter No
7 LCD Module Feature Type TFT Color LCD Module
Active Display Area 640(H) x 480(V)
Pixel Pitch [mm] 0.6375mm(H) x 0.2125mm(V) x RGB
Electrical interface TTL LPL
Color Depth 8BIT, 16.7M colors P/N :
Size [mm] 432(W) x 331.5(H) x 25.0(D) EAJ30338001
Surface Treatment Hard Coating(3H) & Anti Glare
treatment of the front polarizer
Operating Mode Normally Black
Back light Unit 6 CCFL (6 lamps)
R/T Typ 25ms(R.T : 12ms + F.T. : 13ms)
No.
1 Product Dimension Width (W) Length (D) Height (H)
Before Packing 573.2 189.7 453.5
After Packing 635 177 470
2 Product Weight Only SET 6.9kg(LPL)
With BOX 8.7kg(LPL)
3 Container Individual or Palletizing 20ft 40ft
Loading Indi. Wooden Indi. Wooden
Quantity 546 480 1118 1008
4 Stand Assy Type Base detachable
Size (W x D x H) 399.9(W) x 189.7(D) x 67.4(H)
Tilt Degree -3(-0/+3) ~ +10(±2) dgree
Tilt force Target 1.5Kgf (0.8Kgf ~ 2.0Kgf)
Swivel Degree —NON
Swivel Force —NON
5 Appearance General Refer to Standard of LG(55)G1-1020
Item Content
2. Mechanical specification

- 7 -
3. Outgoing Condition
No Item Condition
1 Power Off
2 Volume Level 30
3 Main Picture Input TV
4 Main Last Channel Pr 01
5 Mute Off
6 STATION Auto Programme To set System
Storage from
Search
Manual Programme To set Storage
System
Band
Channel
Fine
Search
Name
Programme Edit To set
Favourite Programme Off
7 PICTURE PSM Dynamic
Standard
Mild
Game
User Contrast 100
Brightness 50
Colour 60
Sharpness 50
Tint 0
CSM Cool
Normal
Warm
User Red 0
Green 0
Blue 0
XD Auo
Manual
Reset To set
8 SOUND SSM Flat, Music, Movie, Sports, User
AVL Off
Balance 0
9 TIME Time -- : --
Off time -- : -- Off
On time -- : --
Pr.1
Vol. 30
Off
Auto sleep Off
10 SPECIAL Language English 16 Language
Country Others 30 Teletext Language
Child Lock Off
XD Demo To start

- 8 -
4. Optical Characteristic
No Item Specification Remark
Min Tpy Max
1 Viewing Angle R/L 89/89
<CR≥10> U/D 89/89
2 Luminance Luminance (cd/m2) 250 320 PSM : Dynamic, CSM: Cool
White luminance uniformity 75% 80%
3 Contrast Ratio CR 500 600 All white/ All black
4 CIE Color Coordinates White Wx 0.298 0.313 0.328 In AV input
(Warm) Wy 0.314 0.329 0.344 PSM : Dynamic
White Wx 0.268 0.283 0.298 (85 IRE)
(Normal) Wy 0.283 0.298 0.313
White Wx 0.259 0.274 0.289
(Cool) Wy 0.271 0.286 0.301

- 9 -
1. Application Range
These documents is applied to 20" LCD TV(chassis : LP69F)
2. Designation
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) Power Adjustment : Free Voltage
3) Magnetic Field Condition : Nil.
4) Input signal Unit : Product Specification Standard
5) Reserve after operation : Above 30 Minutes
6) Adjustment equipments: Color Analyzer(CA-210 or CA-
110), Pattern Generator (MSPG-925L or Equivalent), DDC
Adjustment Jig equipment, Service remote control.
3. Main PCB check process
* APC - After Manual - Insert, executing APC
3.1. Download
1) Execute ISP program “Mstar ISP Utility” and then click
“Config” tab.
2) Set as below, and then click “Auto Detect” and check “OK”
message.
If display “Error”, Check connect computer, jig, and set.
3) Click “Read” tab, and then load download file(XXXX.bin) by
clicking “Read”.
4) Click “Auto” tab and set as below, and then click “Run”.
5) After downloading, check “OK” message.
3.2. Function Check
: Check Input and Signal items (cf. work instruction)
(1) TV
(2) AV1 (SCART)
(3) AV2 (CVBS/ S-Video)
(4) “Speaker-out” Sound Out
* Display and Sound check is executed by Remote control.
4. Total Assembly line process
4.1. Adjustment Preparation
(1) Above 30 minutes Heat-run in RF no signal
(2) 15 Pin D-Sub Jack is connected to the signal of Pattern
Generator.
4.2. SCART RGB Auto ADC
(1) Apply signal of MSPG-1025D, SCART mode, Model 2,
Pattern 19(White/Black top and bottom) with SCART cable.
(2) Change input source to AV1 and check if SCART RGB
signal is properly displayed.
(3) Press Instart button on service remote control.
(4) Position cursor on Auto-RGB item. Then press ‘Vol up’
(5) Check if the OSD changes like “Auto-RGB Process ->
OK”. OK means Auto ADC done successfully.
4.3. Confirm color coordinate of AV2
(1) Set Input to AV2
(2) Input signal : CVBS, PAL@ 50Hz), Full white 216/255 gray
level (85 IRE, Model : 202, Pattern : 78 at MSPG925L)
(3) Set PSM : Dynamic, CSM : Cool
(4) Confirm whether x = 0.276±0.03, y = 0.283±0.03 or not.
4.4. Other quality
(1) Confirm that each items satisfy under standard condition
that was written product spec..
(2) Confirm Video and Sound at each source.
1) AV
(a) Select input AV1 and check whether picture is
displayed or not. - Check whether SCART output
picture is displayed or not.
(b) Select input AV2(S-video) and check whether picture
is displayed or not.
(c) Select input AV2(CVBS) and check whether picture
is displayed or not.
2) TV : Select input TV and check below item.(In Gumi factory)
C05(E05) – Check TELETEXT Function (Applicable
to the model that has Teletext code set-
up item in Product spec)
C07(E07) – Check Nicam DUAL
C52 (E52) – Check Nicam Stereo
* Refer to “6.Preset CH information”
4.5. Power consumption confirmation
(1) Check if Power LED Color and Power Consumption
operate as standard.
(2) Measurement Condition : 230V~, 50Hz (Analog)
(3) Confirm Stand-by operation.
ADJUSTMENT INSTRUCTION
(2) OK
(1)
(5)
(5)
(6) .......... OK
(4)
filexxx.bin

4.6. Outgoing condition Configuration
(1) After all function test, press IN-STOP Key by Service
Remote control. And make outgoing condition.
(2) When pressing IN-STOP key by service remote control, green
and red LED are blinked alternatively. And then automatically
turn off.(Must not AC power off during blinking)
4.7. Option data setting (SVC OSD setting)
5. Adjustment Command
5.1. Adjustment Command (LENGTH=84)
- 10 -
No.
1
2
3
4
5
1
2
3
4
5
6
1
1
2
3
1
2
3
4
Item
Option 1
200R
ACMS
Text
CH+AU
BOOSTER
Option 2
SYS
A2ST
I II SAVE
HDEV
V-Curve
MONO
Option 3
KEY-TYPE
Option 4
Default Language
Lang
T-Lang
Option 5
2HR-OFF
TV-LINK-TUNER
FACTORY-MODE
CHANNEL-MUT
Condition
0
1
1
0
0
0
1
0
0
0
0
2
3
1
0
1
0
0
1
Remark
0 : 200 PR Off
1 : 200 PR On
0 : ACMS Off
2 : ACMS On
TOP
FLOF
0 : Except below area
1 : China, Australia
0 : BG/I/DK/L
1 : BG/I/DK/M
Acting FM-ST after checking Nicam
0 : I II SAVE Off
1 : I II SAVE On
0 : Except below area
1 : China
0 : Turbo Volume Off
1 : Turbo Volume On
2 : 8Key
English German French
Italian Spanish Dutch
Slovak Norwegian Danish
Finnish Portuguese Romanian
Polish Hungarian Czech
Russian
Austria Bulgaria Croatia
Czech Denmark England
Estonia Finland France
Germany Greece Hungary
Italy Latvia
Netherlands
Norway Poland Portugal
Rumania Russia Serbia
Slovakia Slovenia Spain
Sweden Switzerland Turkey
Arab Hebrew Others
0 : 2 Hour off option - OFF
1 : 2 Hour off option - ON
0 : EEPROM Write Protection On
1 : EEPROM Write Protection Off
VAL
00
00
00
00
data
00
00 – 100
00 – 100
00 – 100
00 – 100
00 – FF
00 – FF
00 – FF
00 – 7F
00 – 7F
00 – 7F
00 – 3F
00 - 64
02
0, 1, 2, 3
00
00
Description
Factory mode on
Factory mode off
EEPROM all clear
EEPROM Read
EEPROM Write by
some values
Color Save
They have different
range each mode,
FOS Adjustment
Drive adjustment
Offset adjustment
Bright adjustment
Luminance adjustment
Auto COLOR
Adjustment
0: COOL
1: NORMAL
2: WARM
3: USER
Factory mode off
& II_SW is “1”
& Input change to “TV”
0 : TV
1 : AV1
2 : AV2
3 : Component
4 : RGB
5 : DVI
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
Adjustment Contents
FACTORY ON
FACTORY OFF
EEPROM ALL INIT.
EEPROM Read
EEPROM Write
COLOR SAVE
(R/G/B cutoff, Drive,
Contrast, Bright)
H POSITION
V POSITION
CLOCK
PHASE
R DRIVE
G DRIVE
B DRIVE
R CUTOFF
G CUTOFF
B CUTOFF
BRIGHT
CONTRAST
AUTO_COLOR_
ADJUST
CHANGE_COLOR_
TEMP
FACTORY_
DEFAULT
AUTO_
INPUTCHANGE
CMD(hex)
E0
E2
E4
E7
E8
EB
20
30
90
92
16
18
1A
80
82
84
10
12
F1
F2
F3
F4
ADR
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00

5.2. EEPROM DATA READ
(1) Signal Table
(2) Command Set
Purpose : To read the appointment Address of E2PROM by
128(80h)-byte
5.3. E2PROM Data Write
(1) Signal Table
LEN : 84h+Bytes
CMD : 8Eh
ADH : E2PROM Slave Address(A0,A2,A4,A6,A8),
Not 00h(Reserved by BufferToEEPROM)
ADL : E2PROM Sub Address(00~FF)
Data : Write data
(2) Command Set
<Purpose>
1) EDID write : 16-byte by 16-byte, 8 order (128-byte) write
(TO “00 – 7F” of “EEPROM Page A4”)
2) FOS Default write : 16-mode data (HFh, HFl, VF, STD,
HP, VP, Clk, ClkPh, PhFine) write
3) Random Data write : write the appointment Address of
E2PROM
5.4. VRAM Read
1) Send CMD(70h) to read Video RAM value from MICOM
And save its value to 128-Bytes Buffer(Common Buffer for
the use of EDID).
2) Delay 500ms(Time to wait and read vZideo RAM from
MICOM)
3) Be transmitted the contents of MICOM’s 128-bytes Buffer to
PC.(128th Data is the CheckSum of 127-bytes data : That’s
OK if the value of adding 128-bytes Data is Zero)
- 11 -
ST OP
A
AA
AA 506E 03 CMD ADH84+ n
ST ART
ADL A
CS
A
A
Data_1 A. . . Data_n A
No.
1
2
Adjustment contents
EEPROM WRITE
CMD(hex)
E8
LEN
94
84+n
Details
16-Byte Write
n-byte Write
ADL(hex)
0
80
0
80
0
80
0
80
Details
0-Page 0~7F Read
0-Page 80~FF Read
1-Page 0~7F Read
1-Page 80~FF Read
2-Page 0~7F Read
2-Page 80~FF Read
3-Page 0~7F Read
3-Page 80~FF Read
Adjustment Contents
EEPROM READ
CMD(hex)
E7
ADR(hex)
A0
A2
A4
A6
ST OP
A AD16F
ST OP
ST ART
A
A
A
Dn
A A A506E 03 CMD ADH
84
ST ART AA
ADL A CS
128 Bytes
Delay 100ms
A
CS
AData1
6F
ST ART
. . . Data12 ST OP NA
ST OP
A A A A A50 6E 03 70 00 84
ST ART
AA 00 A CS

LGE Gumi
LGEMA
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 62.25 SECAM-BG PHILIPS DUAL C 04
PR 5 189.25 PAL-BG Crosshatch NICAM DUAL FLOF C 07
PR 6 703.25 PAL-BG RGB, WHITE MONO C 50
PR 7 719.25 PAL-BG MATRIX C/B NICAM STEREO C 52
PR 8 631.25 PAL-I PHILIPS NICAM STEREO C 41
PR 9 807.25 PAL-I Crosshatch NICAM STEREO C 48
PR 10 55.75 PAL-L Crosshatch MONO C 02
PR 11 152.75 PAL-L PHILIPS NICAM DUAL S 07
PR 12 591.25 PAL-L Colorbar NICAM STEREO C 48
PR 13 791.25 SECAM-DK Colorbar MUSIC C61
PR 14 175.25 PAL-B PHILIPS A2 STEREO
PR 15 711.25 PAL-G Colorbar MONO
PR 16 631.25 PAL-I Colorbar NICAM STEREO TOP
PR 17 93.25 SECAM-D PHILIPS A2 DUAL FLOF
PR 18 62.25 PAL-B RED+Circle+Cross A2 STEREO FLOF
PR 19 551.25 PAL-G Colorbar A2 DUAL
PR 20 471.25 PAL-I Colorbar NICAM STEREO FLOF
PR 21 687.25 PAL-G Moving Picture MONO
PR 22 200.00 SECAM-L PHILIPS NICAM STEREO
PR 23 663.25 SECAM-L Colorbar NICAM MONO
PR 24 503.25 PAL-G Half Colorbar A2 DUAL TOP
PR 25 189.25 SECAM-D Colorbar MONO
PR 26 327.25 PAL-D A2 STEREO FLOF
- 12 -
6. Preset CH information
PIF[MHz] SYSTEM VIDEO TXT NAME
SOUND
System Mode

- 13 -
TROUBLESHOOTING
No power
(LED indicator off)
Check short of main B/D
or Change Lips.
Change Q903.
Change LED Assy.
Check 15V or 5V
of Lips.
Check Input/Output
of Q903.
Check LED Assy.
Check S/W update, connector P281
Fail
Fail
Fail
Pass
Pass
Pass
:[A]Process

- 14 -
No Raster
Check LED Status
on TV.
Check Inverter on Check Inverter connector.
Check
IC900, IC901, IC906,
IC907, IC909, IC910
output voltage.
Repeat [A] PROCESS.
Fail
Change Lips.
Fail
Change Defect IC.
Fail
Check input signal cabel.
Fail
Check panel link cable.
Pass
Pass
Pass
:[B]Process
Pass

- 15 -
No Raster on AV Signal
(CVBS/S-VHS/SCART/TUNER)
Check L822, R124, R831
of video signal.
If CVBS of RCA(AV2).
Repeat [A] Process .
If YC
Yes
Fail
Yes
Check L822, R124, R831
of video signal.
Repeat [A] Process.
Pass
No
Pass
If RGB of SCART Yes
Check R280, R281, R282, R110,
R112, R114 of video singal
No
Yes
If If CVBS of SCART Yes
Check L205, R210, R121 of
video signal.
Check Signal Input jack
Check IC911/906
and Lips
Change Tuner.
No
If Tuner Yes
Yes
5V_Tuner is On
Video valid on tuner Pin-13
Yes

- 16 -
No Sound
Check the speaker wire
Change source input.
Check the
input source. Fail
Pass
Re-solder or Change the
defect part.
Check X301.
Check the input/output
of IC100 Fail
Pass
Re-solder or change the
defect part.
Check the input/output
of IC400 Fail
Pass
Change the speaker
Check the speaker
Fail
Pass

- 17 -
BLOCK DIAGRAM
IR detector
5V
MX25L4005A
(Serial Flash)
Control Board(Tact Switch)
LED
Speaker Left Speaker Right
TTL MODULE
15V 5V 15V 12V_Panel
5V 5V
15V
LIPS
RGB in
Audio out
Audio in
CVBS in
Video in
Audio in
Y in
C in
CVBS out
Control in/out
EEPROM
(24C64)
CVBS
Jack
S-Video
Jack
Speaker Output RS232C
LED / IR / Control
Power
Video
Audio
Dat a
Address Data
CLK,DQM, WEZ,CASZ,RASZ
MX232A
TPA6011A (Audio amp)
(RS232C)
M12L16161A -5TG
(SDRAM )
CVBS TunerCVBS Tuner
SCL/SDA
SCL/SDA
Rx/Tx
Rx/Tx
12C(SDA/SCL)
8 ohm/1W /Mono BTL output
SIF_OUT
CVBS OUT
LGE9689AD-LF-1
(Scaler + Video Decoder +Audio Processor)
SCART
Jack
D-Sub
(Service)
CS4352
(DAC)
3.3V
12V
Regulator
Regulator
Regulator
Regulator
Regulator
5V 1.8V
LED/IR Board
Control
ON/OFF
PWM_DIM
DIM _CTL
YDA1 38
(Audio amp)
Clock Board
FET Switch
(SI4925BDY)
5V
12V
CVBS_Video

- 18 -
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.
Voltage Regulator
Voltage regulator convert the input 5V,15V to proper 1.8V, 3.3V, 5V, 12V for Main control system.
For shooting heat trouble, we use the voltage regulator IC.
Digital Audio Amplifier
This block is composed of YDA138-EZ 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 Decoder / Scaler
This block is composed of LGE9655 and peripheral devices.
1) Video Decoder
This Block Selects input Video signals (like CVBS, Y/C, SCART RGB) and output LVDS/ TTL signal through
Scaler.
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 SIF.
The analyzed signals transmitted to audio amplifier.
On decoding, We can control signal like Bass, treble.
3) Scaler
This IC includes A/D Converter and LVDS Transmitter
This IC is directly Inputted Analog Signal and transmits it to LCD Module.
4) Micom
This block controls each IC through IIC communication line.
TUNER
Micom controls this through IIC Line.
TUNER makes CVBS/SIF and transmits CVBS/SIF signal to LGE9689.

- 19 -
MEMO

- 20 -
EXPLODED VIEW
300
121
121
120
120
570
591 590
200 210
580
210
520 411
413
440 441
430
530
412
400
434
431 432
433
550
410