Text preview for : LG CT-20T20K Service manual, repair schematics, online download.pdf part of LG CF/CT-20/21S11KE CF/CT-20/21S31KE CF/CT-20/21T20K COLOR TV
SERVICE MANUAL
CHASSIS : MC-019A
MODEL : CF/CT-20/21S11KE
MODEL :CF/CT-20/21S31KE
MODEL :CF/CT-20/21T20K
Back to : LG CT-20T20K Service manu | Home
COLOR TV
SERVICE MANUAL
CHASSIS : MC-019A
MODEL : CF/CT-20/21S11KE/KEX
MODEL : CF/CT-20/21S31KE/KEX
MODEL : CF/CT-20/21T20K
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
NATVRAL
ALGORITHM EYE
CONTENTS
Contents ................................................................................................................. 2
Safety Precautions ............................................................................................3
Servicing Precautions ..................................................................................... 4
Specifications ..................................................................................................... 6
Description of Controls .................................................................................. 7
Disassembly Instructions .............................................................................10
Adjustment ............................................................................................................11
Purity & Convergence Adjustment ..........................................................14
Block Diagram ......................................................................................................17
Exploded View .................................................................................................. 18
Exploded View Parts List ..............................................................................19
Replacement Parts List ............................................................................... 24
SVC. Sheet ................................................................................................................
- 2 -
SAFETY PRECAUTIONS
IMPORTANT SAFETY NOTICE
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 Before returning the receiver to the customer,
An lsolation Transformer should always be used during always perform an AC leakage current check on the exposed
the servicing of a receiver whose chassis is not isolated from metallic parts of the cabinet, such as antennas, terminals, etc.,
the AC power line. Use a transformer of adequate power rating to be sure the set is safe to operate without damage of
as this protects the technician from accidents resulting in electrical shock.
personal injury from electrical shocks.
Leakage Current Cold Check(Antenna Cold Check)
It will also protect the receiver and it's components from being With the instrument AC plug removed from AC source,
damaged by accidental shorts of the circuitary that may be connect an electrical jumper across the two AC plug prongs.
inadvertently introduced during the service operation. Place the AC switch in the on positioin, connect one lead of
ohm-meter to the AC plug prongs tied together and touch other
If any fuse (or Fusible Resistor) in this TV receiver is blown, ohm-meter lead in turn to each exposed metallic parts such as
replace it with the specified. antenna terminals, phone jacks, etc.
If the exposed metallic part has a return path to the chassis, the
When replacing a high wattage resistor (Oxide Metal Film measured resistance should be between 1M and 5.2M.
Resistor, over 1W), keep the resistor 10mm away from PCB. When the exposed metal has no return path to the chassis the
reading must be infinite.
Keep wires away from high voltage or high temperature parts. An other abnormality exists that must be corrected before the
receiver is returned to the customer.
Due to high vacuum and large surface area of picture tube,
extreme care should be used in handling the Picture Tube. Leakage Current Hot Check (See below Figure)
Do not lift the Picture tube by it's Neck. Plug the AC cord directly into the AC outlet.
Do not use a line Isolation Transformer during this check.
X-RAY Radiation Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor
between a known good earth ground (Water Pipe, Conduit, etc.)
Warning: and the exposed metallic parts.
Measure the AC voltage across the resistor using AC
The source of X-RAY RADIATION in this TV receiver is the voltmeter with 1000 ohms/volt or more sensitivity.
High Voltage Section and the Picture Tube. Reverse plug the AC cord into the AC outlet and repeat AC
For continued X-RAY RADIATION protection, the voltage measurements for each esposed metallic part. Any
replacement tube must be the same type tube as specified in voltage measured must not exceed 0.75 volt RMS which is
the Replacement Parts List. corresponds to 0.5mA.
In case any measurement is out of the limits sepcified, there is
possibility of shock hazard and the set must be checked and
repaired before it is returned to the customer.
To determine the presence of high voltage, use an accurate
high impedance HV meter. Leakage Current Hot Check circuit
Adjust brightness, color, contrast controls to minimum. AC Volt-meter
Measure the high voltage.
The meter reading should indicate
23.5 ¡ 1.5KV: 14-19 inch, 26 ¡ 1.5KV: 19-21 inch,
29.0 ¡ 1.5KV: 25-29 inch, 30.0 ¡ 1.5KV: 32 inch
If the meter indication is out of tolerance, immediate service Good Earth Ground
and correction is required to prevent the possibility of such as WATER PIPE,
To Instrument's CONDUIT etc.
premature component failure. 0.15uF
exposed
METALLIC PARTS
1.5 Kohm/10W
- 3 -
SERVICING PRECAUTIONS
CAUTION: Before servicing receivers covered by this service transistors and semicounductor "chip" components. The
manual and its supplements and addenda, read and follow the following techniques should be used to help reduce the
SAFETY PRECAUTIONS on page 3 of this publication. incidence of component damage caused by static by static
NOTE: If unforeseen circumstances create conflict between the electricity.
following servicing precautions and any of the safety 1. Immediately before handling any semiconductor component
precautions on page 3 of this publication, always follow the or semiconductor-equipped assembly, drain off any
safety precautions. Remember: Safety First. electostatic charge on your body by touching a known earth
ground. Alternatively, obtain and wear a commercially
General Servicing Precautions available discharging wrist strap device, which should be
1. Always unplug the receiver AC power cord from the AC removed to prevent potential shock reasons prior to
power source before; applying power to the unit under test.
a. Removing or reinstalling any component, circuit board 2. After removing an electrical assembly equipped with ES
module or any other receiver assembly. devices, place the assembly on a conductive surface such as
b. Disconnecting or reconnecting any receiver electrical plug aluminum foil, to prevent electrostatic charge buildup or
or other electrical connection. exposure of the assembly.
c. Connecting a test substitute in parallel with an electrolytic 3. Use only a grounded-tip soldering iron to solder or unsolder
capacitor in the receiver. ES devices.
CAUTION: A wrong part substitution or incorrect 4. Use only an anti-static type solder removal device. Some
polarity installation of electrolytic capacitors may result solder removal devices not classified as "anti-static" can
in an explosion hazard. generate electrical charges sufficent to demage ES devices.
d. Discharging the picture tube anode. 5. Do not use freon-propelled chemicals. These can generate
2. Test high voltage only by measuring it with an appropriate electrical charges sufficient to damage ES devices.
high voltage meter or other voltage measuring device (DVM, 6. Do not remove a repalcement ES device from its protective
FETVOM, etc) equipped with a suitable high voltage probe. package until immediately before you are ready to install it.
Do not test high voltage by "drawing an arc". (Most replacement ES devices are packaged with leads
3. Discharge the picture tube anode only by (a) first connecting electrically shorted together by conductive foam, aluminum
one end of an insulated clip lead to the degaussing or kine foil or comparable conductive material).
aquadag grounding system shield at the point where the 7. Immediately before removing the protective material from
picture tube socket ground lead is connected, and then (b) the ieads of a replacement ES device, touch the protective
touch the other end of the insulated clip lead to the picture material to the chassis or circuit assembly into which the
tube anode button, using an insulating handle to avoid device will be installed.
personal contact with high voltage. CAUTION:Be sure no power is applied to the chassis or
4. Do not spray chemicals on or near this receiver or any of its circuit, and observe all other safety precautions.
assemblies. 8. Minimize bodily motions when handling unpackaged
5. Unless specified otherwise in this service manual, clean replacement ES devices. (Otherwise harmless motion such
electrical contacts only by applying the following mixture to as the bruching together of your clothes fabric or the lifting
the contacts with a pipe cleaner, cotton-tipped stick or of your foot from a carpeted floor can generate static
comparable nonabrasive applicator; 10% (by volume) electricity sufficient to damage an ES device.)
Acetone and 90% (by volume) isopropyl alcohol (90%-99%
strength) General Soldering Guidelines
CAUTION: This is a flammable mixture. 1. Use a grounded-tip, low-wattage soldering iron and
Unless specified otherwise in this service manual, lubrication appropriate tip size and shape that will maintan tip
of contacts in not required. temperature within the range or 500¡£ to 600¡£
F F.
6. Do not defeat any plug/socket B+ voltage interlocks with 2. Use an appropriate gauge of RMA resin-core solder
which receivers covered by this service manual might be composed of 60 parts tin/40 parts lead.
equipped. 3. Keep the soldering iron tip clean and well tinned.
7. Do not apply AC power to this instrument and/or any of its 4. Thorohly clean the surfaces to be soldered. Use a mall
electrical assemblies unless all solid-state device heat sinks wirebristle (0.5 inch, or 1.25cm) brush with a metal handle.
are correctly installed. Do not use freon-propelled spray-on cleaners.
8. Always connect the test receiver ground lead to the 5. Use the following unsoldering technique
receiver chassis ground before connecting the test receiver a. Allow the soldering iron tip to reach normal temperature.
positive lead. (500¡£ to 600¡£
F F)
Always remove the test receiver ground lead last. b. Heat the component lead until the solder melts.
9. Use with this receiver only the test fixtures specified in this c. Quickly draw the melted solder with an anti-static,
service manual. suction-type solder removal device or with solder braid.
CAUTION: Do not connect the test fixture ground strap to CAUTION: Work quickly to avoid overheating the
any heatsink in this receiver. circuiboard printed foil.
6. Use the following soldering technique.
Electrostatically Sensitive (ES) Devices a. Allow the soldering iron tip to reach a normal
Some semiconductor (solid state) devices can be damaged temperature (500¡£ to 600¡£
F F)
easily by static electricity. Such components commonly are b. First, hold the soldering iron tip and solder the strand
called Electrostatically Sensitive (ES) Devices. Examples of against the component lead until the solder melts.
typical ES devices are integrated circuits and some fieldeffect
- 4 -
c. Qulckly move the soldering iron tip to the junction of the Fuse and Conventional Resistor
component lead and the printed circuit foil, and hold it Removal/Replacement
there only until the solder flows onto and around both the 1. Clip each fuse or resistor lead at top of the circuit board
component lead and the foil. hollow stake.
CAUTION: Work quickly to avoid overheating the circuit 2. Securely crimp the leads of replacement component around
board printed foil. notch at stake top.
d. Closely inspect the solder area and remove any excess 3. Solder the connections.
or splashed solder with a small wire-bristle brush. CAUTION: Maintain original spacing between the replaced
component and adjacent components and the circuit board
IC Remove/Replacement to prevent excessive component temperatures.
Some chassis circuit boards have slotted holes (oblong) through
which the IC leads are inserted and then bent flat against the Circuit Board Foil Repair
circuit foil. When holes are the slotted type, the following Excessive heat applied to the copper foil of any printed circuit
technique should be used to remove and replace the IC. When board will weaken the adhesive that bonds the foil to the circuit
working with boards using the familiar round hole, use the board causing the foil to separate from or "lift-off" the board.
standard technique as outlined in parapraphs 5 and 6 above. The following guidelines and procedures should be followed
whenever this condition is encountered.
Removal
1. Desolder and straighten each IC lead in one operation by At IC Connections
gently prying up on the lead with the soldering iron tip as the To repair a defective copper pattern at IC connections use the
solder melts. following procedure to install a jumper wire on the copper
2. Draw away the melted solder with an anti-static suction- pattern side of the circuit board. (Use this technique only on IC
type solder removal device (or with solder braid) before connections).
removing the IC.
Replacement 1. Carefully remove the damaged copper pattern with a sharp
1. Carefully insert the replacement IC in the circuit boare. knife. (Remove only as much copper as absolutely
2. Carefully bend each IC lead against the circuit foil pad and necessary).
solder it. 2. carefully scratch away the solder resist and acrylic coating
3. Clean the soldered areas with a small wire-bristle brush. (if used) from the end of the remaining copper pattern.
(It is not necessary to reapply acrylic coating to the areas). 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.
"Small-Signal" Discrete Transistor 4. Route the jumper wire along the path of the out-away
Removal/Replacement copper pattern and let it overlap the previously scraped end
1. Remove the defective transistor by clipping its leads as of the good copper pattern. Solder the overlapped area and
close as possible to the component body. clip off any excess jumper wire.
2. Bend into a "U" shape the end of each of three leads
remaining on the circuit board. At Other Connections
3. Bend into a "U" shape the replacement transistor leads. Use the following technique to repair the defective copper
4. Connect the replacement transistor leads to the pattern at connections other than IC Pins. This technique
corresponding leads extending from the circuit board and involoves the installation of a jumper wire on the component
crimp the "U" with long nose pliers to insure metal to metal side of the circuit board.
contact then solder each connection.
1. Remove the defective copper pattern with a sharp knife.
Power Output, Transistor Device Remove at least 1/4 inch of copper, to ensure that a
Removal/Replacement hazardous condition will not exist if the jumper wire opens.
1. Heat and remove all solder from around the transistor leads. 2. Trace along the copper pattern from both sides of the
2. Remove the heatsink mounting screw (if so equipped). pattern break and locate the nearest component that is
3. Carefully remove the transistor from the heat sink of the directly connected to the affected copper pattern.
circuit board. 3. Connect insulated 20-gauge jumper wire from the lead of
4. Insert new transistor in the circuit board. the nearest component on one side of the pattern break to
5. Solder each transistor lead, and clip off excess lead. the lead of the nearest component on the other side.
6. Replace heatsink. Carefully crimp and solder the connections.
CAUTION: Be sure the insulated jumper wire is dressed so
Diode Removal/Replacement the it does not touch components or sharp edges.
1. Remove defective diode by clipping its leads as close as
possible to diode body.
2. Bend the two remaining leads perpendicula 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.
- 5 -
SPECIFICATIONS
Note : Specification and others are subject to change without notice for improvement.
O Video input system:
PAL-B/G, D/K, I/I SOUND IF : 33.4MHz (B/G)
SECAM-B/G, D/K,L/L' 32.9MHz (I/I)
NTSC M 32.4MHz (D/K)
NTSC 4.43 34.4MHz (M)
O Intermediate Frequency (Unit : MHz) O Power requirement : 110~240V, 50/60Hz
VISION IF : 38.9MHz
COLOR IF : 34.47MHz(4.43) O Power consumption : 95
35.32MHz(3.58) : NTSC-M
VIF-4.25000MHz ): SECAM O STAND-BY : 3W
(
VIF-4.40625MHz
O Tuning range
For TV
Band For CATV
B/G D/K I/I NTSC
VHF-Low Ch2-4 Ch1-5 S1'-S3', S1
Ch2-13 S2-S10,
VHF-High Ch5-12 Ch6-12 Ch4-13
S11-S20
Hyper S21-S41
UHF Ch21-69 Ch14-69
O Tuning system : O Feature : Auto programme/Manual programme
FVS CSM (Color Status Memory)
100 Programme memory Auto Sleep
200 Programme memory(W/O TXT) Turbo Picture & Sound
Programme Editing
O Antenna input impedance : VHF/UHF 75 ohm, unbalanced PSM (Picture Status Memory)
Teletext (TOP/FLOF/LIST)
O OSD (On Screen Display) : EASY-MENU ACMS
Auto Volume Level
O Voice coil impedance : 8 ohm Game
SSM(Sound Status Memory)
O Sound output : 7W¡¿2(MAX) Favorite Program
Dual/Stereo : A2/NICAM(Option)
O External connection : Head Phone Jack
A/V in : 2
PERI Connector(Full Scart) : 1
DVD in
O External In/Output
Audio-In:0.5Vrms !3dB,over 10Kohm
Audio-Out:0.5Vrms !3dBb,below 1Kohm
Video-In/Out:1Vp-p !3dB,75ohm
DVD In Y: 1Vp-p !3dB
Pb,Pr : 0.7Vp-p ! 3dB
- 6 -
DECRIPTIONS OF CONTROLS
All the functions can be controlled with the remote control handset.
Some functions can also be adjusted with the buttons on the front
panel of the set.
Remote control handset
Before you use the remote control handset, please install the bat-
teries. See the next page.
POWER MUTE 1. POWER
1 10 switches the set on from standby or off to standby.
1 2 3 2. NUMBER BUTTONS
switches the set on from standby or directly select a number.
2 4 5 6
3. MENU (or INDEX)
7 8 9 selects a menu.
selects an index page in the teletext mode (only TELETEXT
MENU/INDEX TV/AV
0 models).
3 11
TV
4. EYE/ (option)
4
EYE/ PR ( ) I/II/
12 *
switches the eye function on or off.
VOL VOL 5. ( ) / ( ) (Programme Up/Down)
5 OK
selects a programme or a menu item.
Q.VIEW PR ( ) LIST
switches the set on from standby.
6 13 scans programmes automatically.
F / G (Volume Up/Down)
TEXT/MIX SIZE HOLD adjusts the volume.
adjusts menu settings.
7 UPDATE TIME REVEAL OK
accepts your selection or displays the current mode.
PSM SSM/ SLEEP
8 M 14 6. Q.VIEW
/ 15 returns to the previously viewed programme.
16 selects a favorite programme.
PICTURE SOUND
TURBO/
9 7. TELETEXT BUTTONS (option)
These buttons are used for teletext.
For further details, see the `Teletext' section.
8. PSM (Picture Status Memory)
recalls your preferred picture setting.
9. TURBO PICTURE / SOUND BUTTON (option)
selects Turbo picture and sound.
(With TELETEXT)
- 7 -
10. MUTE
switches the sound on or off.
11. TV/AV
selects TV or AV mode.
clears the menu from the screen.
switches the set on from standby.
12. I/II/ (option)
*
selects the language during dual language broadcast. (option)
selects the sound output. POWER MUTE
1 10
13. LIST
displays the programme table. 1 2 3
14. SLEEP 2 4 5 6
sets the sleep timer.
7 8 9
15. SSM/ (option) (Sound Status Memory)
*
recalls your preferred sound setting.
3
MENU
0
TV/AV
11
16. SURROUND (º/ ) (option)
º
*
selects surround sound. 4
EYE/ PR ( ) I/II/
12
COLOURED BUTTONS : These buttons are used for teletext (only VOL VOL
5 OK
TELETEXT models) or programme edit.
Q.VIEW PR ( ) LIST
6 13
Battery installation
The remote control handset is powered by two AAA type batteries.
To load the batteries, turn the remote control handset over and
open the battery compartment. Install two batteries as indicated by
the polarity symbols ( + and - ) marked inside the compartment. PSM SSM/ SLEEP
8 14
/ 15
16
PICTURE SOUND
TURBO/
9
Note : To avoid damage from possible battery leakage, remove the
batteries if you do not plan to use the remote control handset for an
extended period of time.
(Without TELETEXT)
- 8 -
Front panel
Shown is a simplified representation of front or side panel.
Here shown may be somewhat different from your set.
VIDEO
VIDEO
6 (L) ON/OFF r MENU OK F VOL G E PR D VIDEO (L)-AUDIO-(R) ! P-TURBO-S
I
AUDIO
AUDIO I
(R) 1 2 3 4 5 6 7 8 9
! 7 !
TURBO
ON/OFF r MENU OK F VOL G E PR D VIDEO AUDIO ! SOUND PICTURE
! 7 !
VIDEO
VIDEO 1 23 4 5 6 7 8 9
6 (L)
I
AUDIO
AUDIO I PR D
(R) ON/OFF r MENU F VOL VOL G OK
PR E
(Side panel)
1 23 4 5 9
1. MAIN POWER (ON/OFF)
switches the set on or off.
2. POWER/STANDBY INDICATOR
illuminates brightly when the set is in standby mode.
dims when the set is switched on.
blinks when signal is input from the remote control.
3. REMOTE CONTROL SENSOR
4. MENU
selects a menu.
5. OK
accepts your selection or displays the current mode.
F / G (Volume Up/Down)
adjusts the volume.
adjusts menu settings.
D / E (Programme Up/Down)
selects a programme or a menu item.
switches the set on from standby.
6. AUDIO/VIDEO IN SOCKETS (AV) (option)
Connect the audio/video out sockets of external equipment to
these sockets.
Note :If both the input jacks on the front/side panel and back
panel have been connected to external equipments simultane-
ously, only the input jacks on the front/side panel can be received.
7. HEADPHONE SOCKET (option)
Connect the headphone plug to this socket.
8. TURBO SOUND/PICTURE (option)
switches Turbo sound or Turbo picture on or off.
9. EYE (option)
adjusts picture according to the surrounding conditions.
- 9 -
DISASSEMBLY INSTRUCTIONS
Important note Chassis Assy Removal
This set is disconnected from the power supply through the Grasp both side of Frame and pull it backward smoothly.
converter transformer. An isolating transformer is necessary
for service operations on the primary side of the converter
transformer.
Back Cabinet Removal
Remove the screws residing on the back cabinet and carefully
separate the back cabinet from the front cabinet. (Fig. 2-1).
CPT Removal PICTURE TUBE HANDLING CAUTION
1. Pull out the CPT board from the CPT neck. Due to high vacuum and large surface area of picture tube, great
2. Place the front cabinet on soft material not to mar the front care must be exercised when handling picture tube. Always lift
picture tube by grasping it firmly around faceplate.
surface or damage control knobs.
NEVER LIFT TUBE BY ITS NECK! The picture tube must not be
3. Remove 5 screws securing the picture tube mounting
scratched or subjected to excessive pressure as fracture of
brackets to the front cabinet. glass may result in an implosion of considerable violence which
4. Carefully separate CPT from the front cabinet. can cause personal injury or property damage.
CPT
board
Remove
Screws
Main
PCB
Fig. 2-1 Fig. 2-2
- 10 -
ADJUSTMENT
O Safety Precautions Option Code Function Remark
1. It is safe to adjust after using insulating transformer 0 W/O TBS
between the power supply line and chassis input to TBS
1 WITH TBS
prevent the risk of electric shock and protect the
instrument. 0 W/O EYE
EYE
2. Never disconnect leads while the TV receiver is on. 1 WITH EYE
3. Don't short any portion of circuits while power is on.
4. The adjustment must be done by the correct appliances. 0 W/O 4 KEY
4 KEY
But this is changeable in view of productivity. 1 WITH 4 KEY
5. Unless otherwise noted, set the line voltage to 0
110~240Vac!10%, 50/60Hz. MONO
6. The adjustment of TV should be performed afther warming 1 FORCED MONO
up for 20 minutes.
Table 2. OPTION 2 Function
O Test Equipment required
1. Multimeter (volt meter) Option Code Function Remark
2. Oscilloscope 0 Auto Abnormal ON
3. 10:1 PROBE BCF
1 Not Used
4. Color Analyzer
0 W/O GAME PACK
GAME
O CDL Data Adjustment(LINE SVC-0) 1 WITH GAME PACK
1) Press the SVC button to get into the SVC-0 Mode. 0 100 PRO
2) Press the Channel UP/DOWN button to select CDL12. 200 PRO
3) Press the Volume UP/DOWN button until the CDL data is 1 200 PRO
the same as the Table below. CHA 0 Except China,Austrailia
+ AU 1 China,Austrailia
21" FCD 14,16" CPT 15" CPT 20,21" CPT 0 W/O DUAL
DUAL
CDL Data 12 8 10 12 1 WITH DUAL
0 Austrailia
Remark FLAT FLAT ACMS
1 Except Austrailia
4) Press the OK(V) button to memorize the data. 0 W/O TURBO SEARCH
T-SCH
1 WITH TURBO SEARCH
O OPTION Data Adjustment(OPTION-1,OPTION-2)
1) Press OK buttons on both TV set and Remote Controller at 0 W/O TURBO P/S
T-P/S
the same time to get into SVC mode. 1 WITH TURBO P/S
2) Press the Yellow button several times to find OPTION-1 or
0 NORMAL VOLUME CURVE
OPTION-2. CURVE
3) Input the correspond OPTION data referring to Table below 1 M-A,India VOLUME CURVE
with the numeric buttons.
4) Press the OK(V) button to memorize the data.
Table 3. OPTION 3 Function
Table 1. OPTION 1 Function Option Code Function Remark
Option Code Function Remark 0 ***
RESER
0 ACTIVE VED 1 ***
C MUTE
1 NOT ACTIVE 0 W/O HOTEL
HOTEL
0 W/O DVD 1 W/HOTEL
DVD
1 DVD(REAR JACK) 0 BG/L
0 W/O 2 IN 1TUNER 1 BG/I/DK
2 IN 1
1 WITH 2 IN 1TUNER 2 BG/I/DK/M
0 FLOF TXT 3 BG/I/DK DUAL
TOP SYSTEM
1 TOP TXT 4 BG/I/DK/M DUAL
0 PHONO JACK 5 2nd IF BG
SCART
1 SCART JACK 6 2nd IF I
7 2nd IF DK
- 11 -
Option Code Function Remark O FOCUS Adjustment
0 ENG. ONLY English
Test Point : RK (Red Cathode of CPT Board)
OSD-L 1 EU-7EA English,Deutsch,Francais,Italiano,Espanol Adjust : Screen Volume of FBT
(EU) 2 EU ALL English,Nederlands,Svenska,Dansk,Suomi,Por
tugues,Romaneste,Polski,Cesky,Pyccknn
1) Tune the TV set to receive a PAL 05CH.
3 EU EAST English,Romaneste,Polski,Cesky,Pyccknn,Magyar 2) Adjust the Focus Volume of FBT for best focus.
0 ENG. ONLY English
OSD-L O Screen Voltage Adjustment
1 ARABIC English,Arab,,Urdu,French
(M-
ASIA) 2 PARSI English,Parsi,Urdu,French Test Point : Observing Display
3 ARAB,FARSI,URDE English,French,Arab,Urdu,Parsi Adjust : Focus Volume of FBT
OSD-L 0 ENG.ONLY English
(E-ASIA) 1 ASIA-ALL English,Malay,Vietnam,Indonesian,Thai 1) Connect the probe of oscilloscope to the RK (Red Cathode)
0 ENG.ONLY English of CPT Board.
OSD-L 2) Set the oscilloscope to 50V/div and 20Us/div and after
(CH+HI) 1 E+CHINA English,Chinese putting GND line upon the lowest grid line of the scope by
2 E+HINDI English,Hindi pressing GND button,enter into DC mode.
0 3) Tune the TV set to receive a PAL-B/G 05CH.
W-EU
4) Adjust Screen Volume of FBT so that the waveform is the
TXT-L 1 E-EU same as below figure (DC 140!3V).
(EU) 2 CYRILLIC
Horizontal
3 UKRAINIAN FlyBack Time
Black level
TXT-L 0 WEST-EU
140Vp-p
(E-ASIA)
TXT-L 0 WEST-EU
(ARAB) 1 ARABIC White level
GND for dc
TXT-L 0 WEST-EU
(FARSI) 1 FARSI
14" OTHERS
DC 130V!3 V DC 140V!3 V
O AGC Adjustment (SERVICE 1)
O White Balance Adjustment.(LINE SVC-0)
Test Point : AGC TP (C101)
Adjust : Remote Controller NOTE : This adjustment should be performed after screen voltage
adjustment.
1) Connect RF signal (70dB¡ 0.2dB) and turn on the TV. 1) Tune the TV set to receive an 100% white pattern.
¡ Standard adjustment Channel 2) Press OK(V) buttons on TV set and remote controller at the
- EU 05 Ch. (frf = 175.25MHz) same time to get into SVC mode.
2) Press the OK buttons on TV set and Remote Controller at the 3) Press Yellow button on remote controller. (Standard mode)
same time to get into SVC-0 mode. 4) Press Channel UP/DOWN button for desirous function
3) Press the Channel UP/DOWN button on the Remote adjustment.
Controller several times to find AGC??. 5) Adjust VOL+ or VOL-button in each status of "RG--"/"BG--" for
4) Press the Volume UP/DOWN button until the AGC Voltage is X=272!8, Y=288!8 with color analyzer.(Europe Model :
the same as the Table below. X=288!8, Y=295!X=272!8, 11,000K)
5) Press the OK(V) button to memorize the data.
Status Initial Data Remark
Tuner P/N 6700VPF009G 6700VPF016A
RG 31
Marker LG Innotek(W/S TUNER) DAEWOO(W/S TUNER)
GG 31
AGC Voltage 2.7 ! 0.05V 2.7 ! 0.05V
BG 31
Tuner P/N 6700VPF009S
BLO-R 31
Marker LG Innotek(TBS TUNER)
2.5 ! 0.05V BLO-G 31
AGC Voltage
7) Press the OK(V) button to memorize the data.
- 12 -
O Deflection Data Adjustment (Line SVC-1)
NOTE: To enter SVC mode, press "OK" buttons on both TV set
and the Remote control at the same time.
1. Preparation for Deflection Adjustment
1) At SVC mode, press the Yellow colored button.
And then, deflection data adjustment OSD (SVC1 mode) will
be displayed.
2) Tune the TV set to receive a PAL 05 CH.
2. Deflection Initial Setup Data
Status Default 21" FLAT S/S 21" FLAT LG
VL 31 31 31
VA 31 31 31
VS 31 31 31
HS 31 31 31
SC 25 25 25
3. Deflection Adjustment Procedure
VL (Vertical Linearity)
Adjust so that the boundary line between upper and lower half
is in accord with geometric horizontal center of the CPT.
VA (Vertical Amplitude)
Adjust so that the circle of a digital circle pattern may be
located within the effective screen of the CPT.
SC (Vertical "S" Correction)
Adjust so that all distance between each horizontal lines are
to be the same.
VS (Vertical Shift)
Adjust so that the horizontal center line of a digital circle
pattern is in accord with geometric horizontal center of the
CPT.
HS (Horizontal Shift)
Adjust so that the vertical center line of a digital circle pattern is
in accord with geometric vertical center of the CPT.
Press the OK(V) button to memorize the data.
- 13 -
PURITY & CONVERGENCE ADJUSTMENT
Caution:
Convergence and Purity have been factory aligned. Do not 5. Reconnect the internal degaussing coil.
attempt to tamper with these alignments.
However, the effects of adjacent receiver components, or 6. Position the beam bender locking rings at the 9 o'clock
replacement of picture tube or deflection yoke may require the position and the other three pairs of tabs (2,4 and 6 pole
need to readjust purity any convergence. magnets) at the 12 o'clock position.
DEFLECTION YOKE 6-POLE
PURITY &CONVERGENCE 6-POLE
MAGNETS
MAGNES PURITY MAGNET(2-POLE)
MAGNET ASSEMBLY
6-POLE
,,,,
,,,, ,
,,,, ,
,,,, , ,
,,,,
,,,,
,,,, 4-POLE
,,,,
,
,,,, ,
,,,, ,
,,,, ,
,,,,
,,,,
, X-AXIS YOKE MAGNET
,,
,,,, , ,
,,,,
,, , POSITIONING
(L/R PURITY)
RUBBER
WEDGES PURITY MAGNET
4-POLE
GLASS CLOTH TAPE CONVERGENCEMAGNET ASSEMBLY
MAGNET ASSEMBLY
CONVERGENCE
¡ Purity Adjustment
This procedure DOES NOT apply to bonded yoke and picture 7. Perform the following steps, in the order given, to prepare the
tube assemblies. receiver for the purity adjustment procedure.
The instrument should be at room temperature (60 degrees F or
above) for six (6) hours and be operating at low beam current a. Face the receiver in the "magnetic north" direction.
(dark background) for approximately 20 to 30 minutes before
performing purity adjustments. b. Externally degauss the receiver screen with the television
power turned off.
CAUTION: Do not remove any trim magnets that may be
attached to the bell of the picture tube. c. Turn the television on for approximately 10 seconds to
perform internal degaussing and then turn the TV off.
1. Remove the AC power and disconnect the internal
degaussing coil. d. Unplug the internal degaussing coil. This allows the
thermistor to cool down while you are performing the purity
2. Remove the yoke from the neck of the picture tube. adjustment. DO NOT MOVE THE RECEIVER FROM ITS
"MAGNETIC NORTH" POSITION.
3. If the yoke has the tape version beam bender, remove it and
replace it with a adjustable type beam bender (follow the e. Turn the receiver on and obtain a red raster by increasing
instructions provided with the new beam bender) the red bias control (CW) and decreasing the bias controls
for the remaining two colors (CCW).
4. Replace the yoke on the picture tube neck, temporarily
remove the three (3) rubber wedges from the bell of the f. Attach two round magnets on the picture tube screen at 3
picture tube and then slide the yoke completely forward. o'clock and 9 o'clock positions, approximately one (1) inch
from the edge of the mask (use double-sided tape).
- 14 -
1.ADJUST YOKE Z-AXIS FIRST 2 .ADJUST BEAM BENDER 2 POLE
TO GET EQUAL BLUE MAGNET TO GET FOUR EQUAL
COLOR CIRCLES COLOR CIRCLES
MAGNETS
RED RED
8. Referring to above, perform the following two steps: 6. Reconnect the internal degaussing coil and apply AC power.
a. Adjust the yoke Z-axis to obtain equal blue circles.
b. Adjust the appropriate beam bender tabs to obtain correct 7. Turn the receiver on for 10 seconds to perform internal
purity (four equal circles). degaussing and then turn the receiver off again.
9. After correct purity is set, tighten the yoke clamp screw and 8. Unplug the internal degaussing-coil.
remove the two screen magnets.
9. Turn on the receiver, connect a signal generator to the VHF
10. Remove the AC power and rotate the receiver 180 degrees antenna terminal and apply a crosshatch signal.
(facing "magnetic south").
Caution: During the convergence adjustment procedure, be
11. Reconnect the internal degaussing coil. very careful not to disturb the purity adjustment tabs
are accidentally move, purity should be confirmed
12. Turn the receiver on for 10 seconds (make sure the receiver before proceeding with the convergence adjustments.
came on) to perform internal degaussing, and then turn the
receiver off. Note: Make sure the focus is set correctly on this instrument
before proceeding with the following adjustment.
13. Unplug the internal degaussing coil.
10. Converge the red and blue vertical lines to the green vertical
14. Turn on the receiver and check the purity by holding one (1) line at the center of the screen by performing the following
round magnet at the 3 o'clock and a second round magnet at steps (below TABLE).
9 o'clock position. If purity is not satisfactory, repeat steps 8 a. Carefully rotate both tabs of the 4-pole ring magnet
through 14. simultaneously in opposite directions from the 12 o'clock
position to converge the red and blue vertical lines.
15. Turn off the receiver and reconnect the internal degaussing b. Carefully rotate both tabs of the 6-pole ring magnet
coil. simultaneously in opposite directions form the 12 o'clock
position to converge the red and blue (now purple)
vertical lines with the green vertical line.
¡ Convergence Adjustment
11. Converge the red and blue horizontal with the green line at
Caution: This procedure DOES NOT apply to bonded yoke and the center of the screen by performing the following steps.
picture tube assemblies. (below TABLE)
Do not use screen magnets during this adjustment a. Carefully rotate both tabs of the 4-pole ring magnet
procedure. Use of screen magnets will cause an simultaneously in the same direction (keep the spacing
incorrect display. between the two tabs the same) to converge the red and
blue horizontal lines.
1. Remove AC power and disconnect the internal degaussing b. Carefully rotate both tabs of the 6-pole ring magnet
coil. simultaneously in same direction (keep the spacing
between the two tabs the same) to converge the red and
2. Apply AC Power and set the brightness to the Picture Reset blue (now purple) horizontal lines with the green
condition. Set the Color control to minimum. horizontal line.
c. Secure the tabs previsouly adjusted by locking them in
3. Make a horizontal line. place with the locking tabs on the beam bender.
4. Adjust the Red, Green and Blue Bias controls to get a dim
white line.
5. Restore the screen by removing the horizontal line.
- 15 -
RING ROTATION DIRECTION MOVEMENT OF RED
PAIRS OF BOTH TABS AND BLUE BEAMS
B B
OPPOSITE OR
R R
4
POLE
SAME B R OR B R