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COLOR TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : MC-022A
MODEL:CT-25/29M60RE/RX
MODEL:CT-25/29M60VE/VQ
website:http://biz.LGservice.com
e-mail:http://www.LGEservice.com/techsup.html
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CONTENTS
Contents ................................................................................................................. 2
Safety Precautions ............................................................................................3
Specifications ..................................................................................................... 4
Control Descriptions ........................................................................................ 5
Disassembly Instructions ............................................................................. 8
Adjustment Instructions ............................................................................... 9
Block Diagram .................................................................................................... 16
Trouble Shooting .............................................................................................. 18
Exploded View .................................................................................................. 22
Exploded View Parts List .............................................................................23
Replacement Parts List ............................................................................... 24
SVC. Sheet ................................................................................................................
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SAFETY PRECAUTIONS
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in
the Schematic Diagram and Replacement Parts List.
It is essential that these special safety parts should be replaced with the same components as recommended in this manual to
prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
General Guidance
An lsolation 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 circuitary 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.
Due to high vacuum and large surface area of picture tube,
extreme care should be used in handling the Picture Tube.
Do not lift the Picture tube by it's Neck.
X-RAY Radiation
Warning:
To determine the presence of high voltage, use an accurate
high impedance HV meter.
Adjust brightness, color, contrast controls to minimum.
Measure the high voltage.
The meter reading should indicate
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
and correction is required to prevent the possibility of
premature component failure.
Before returning the receiver to the customer,
always perform an AC leakage current check on the exposed
metallic parts of the cabinet, such as antennas, terminals, etc.,
to be sure the set is safe to operate without damage of
electrical shock.
Leakage Current Cold Check(Antenna Cold Check)
With the instrument AC plug removed from AC source,
connect an electrical jumper across the two AC plug prongs.
Place the AC switch in the on positioin, 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 1MΩ and 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 esposed 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 sepcified, there is
possibility of shock hazard and the set must be checked and
repaired before it is returned to the customer.
Leakage Current Hot Check circuit
The source of X-RAY RADIATION in this TV receiver is the
High Voltage Section and the Picture Tube.
For continued X-RAY RADIATION protection, the
replacement tube must be the same type tube as specified in
the Replacement Parts List.
1.5 Kohm/10W
To Instrument's
exposed
METALLIC PARTS
Good Earth Ground
such as WATER PIPE,
CONDUIT etc.
AC Volt-meter
IMPORTANT SAFETY NOTICE
0.15uF
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SPECIFICATIONS
Note : Specification and others are subject to change without notice for improvement.
O Video input system:
PAL-B/G, D/K, I/I
SECAM-B/G, D/K/L/L’
NTSC M
NTSC 4.43(AV)
NTSC- M/PAL M-N
O Intermediate Frequency (Unit : MHz)
VISION IF : 38.9MHz,33.9MHz(SECAM-L’)
COLOR IF : 34.47MHz(4.43)
35.32MHz(3.58) : NTSC-M
VIF-4.25000MHz
VIF-4.40625MHz
SOUND IF : 33.4MHz (B/G)
32.9MHz (I/I)
32.4MHz (D/K,L)
34.4MHz (M)
40.4MHz (L’)
O Power requirement : 110~240V, 50/60Hz(NON-EU)
230V, 50Hz(EU)
O Power consumption : 25”:125W
29”:135W
O Tuning system :
FVS
100 Programme memory
200 Programme memory(W/O TXT Model)
O
Antenna input impedance : VHF/UHF 75 ohm, unbalanced
O Voice coil impedance : 8 ohm
O External In/Output
Audio-In:0.5Vrms
± 3db,over 10Kohm
Audio-Out:0.5Vrms
± 3db,below 1Kohm
Video-In/Out:1Vp-p
± 3db,75ohm
R,G,B In:0.7Vp-p
± 3db
O Feature & Funtion
Teletext(TOP/FLOF/LIST)
AV Input : Side or Front(1),Rear(2)
Component Input : Rear(Opt.)
PERI TV Connector(AV Input,SCART Opt.)
RGB INput
2 Carrier Stereo : BG/DK
NICAM Stereo : BG/I/L
2 Carrier Dual : BG/DK
NICAM Dual : BG/I/L
SSC(Split Screen) Mode
Multi Picture Display Mode(1:4:9 PIP)
DBS
O Tuning range
Band
VHF-Low
VHF-High
Hyper
UHF
S1'-S3', S1
S2-S10,
S11-S20
S21-S41
For TV
For CATV
B/G
Ch2-4
Ch5-12
D/K
Ch1-5
Ch6-12
I/I
Ch4-13
NTSC
Ch2-13
Ch21-69 Ch14-69
( ): SECAM
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DESCRIPTION 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 batteries. See the next page.
1. POWER
switches the set on from standby or off to standby.
2. NUMBER BUTTONS
switches the set on from standby or directly select a number.
3. ARC (Aspect Ratio Control)
changes the picture format.
4. TURBO PICTURE / SOUND BUTTON
selects Turbo picture / sound.
5.
/
(Programme Up/Down)
selects a programme or a menu item.
switches the set on from standby.
scans programmes automatically.
FF / GG
(Volume Up/Down)
adjusts the volume.
adjusts menu settings.
6. VCR BUTTONS (option)
control a LG video cassette recorder.
7. SSM (Sound Status Memory)
recalls your preferred sound setting.
8. I/II (option)
selects the language during dual language broadcast (option).
selects the sound output.
9. PSM (Picture Status Memory)
recalls your preferred picture setting.
10. TELETEXT BUTTONS (option)
These buttons are used for teletext.
For further details, see the ‘Teletext’ section.
11. MUTE
switches the sound on or off.
12. TV/AV
selects TV or AV mode.
switches the set on from standby.
13. MENU
selects a menu.
OK
PR
VOL
PR
VOL
PLAY
P/STILL STOP
REC
REW
FF
I/II SSM LIST
PSM
SLEEP
PIP
Q.VIEW
?
MIX
TIME
SWAP
INPUT
REVEAL MODE
SIZE
STILL
POSITION
9/4 PIP
i
M
0
ARC
TV/AV
MENU
PICTURE
SOUND
1
2 3
4
5 6
7
8 9
POWER
MUTE
TEXT
PR
PR
T U R B O
EYE/
( )
( )
11
12
15
16
13
18
14
17
19
(With TELETEXT / PIP)
TEXT
Q.VIEW
?
MIX
TIME
REVEAL MODE
SIZE
HOLD
UPDATE
INDEX
i
M
(With TELETEXT / Without PIP)
10
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14. OK
accepts your selection or displays the current mode.
15. LIST
displays the programme table.
16. EYE/*(option)
switches the eye function on or off.
17. SLEEP
sets the sleep timer.
18. Q.VIEW
returns to the previously viewed programme.
selects a favorite programme.
19. PIP BUTTONS (option)
PIP
switches the sub picture on or off.
PR +/
-
selects a programme for the sub picture.
SWAP
alternates between main and sub picture.
INPUT
selects the input mode for the sub picture.
SIZE
adjusts the sub picture size.
STILL
freezes motion of the sub picture.
POSITION
relocates the sub picture in clockwise direction.
9/4 PIP
switches on or off the 9 or 4 sub pictures.
COLOURED BUTTONS
These buttons are used for teletext (only TELETEXT models) or
programme edit.
Battery installation
The remote control handset is powered by two AAtype 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.
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.
+
-
OK
PR
VOL
PR
VOL
PLAY
P/STILL STOP
REC
REW
FF
I/II SSM LIST
PSM
SLEEP
Q.VIEW
0
ARC
TV/AV
MENU
PICTURE
SOUND
1
2 3
4
5 6
7
8 9
POWER
MUTE
T U R B O
EYE/
( )
( )
2
1
3
5
6
8
4
9
7
11
12
15
16
13
18
14
17
(Without TELETEXT / PIP)
PIP
Q.VIEW
SWAP
INPUT
SIZE
STILL
POSITION
9/4 PIP
PR
PR
EYE/
(Without TELETEXT / With PIP)
19
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1. MAIN POWER
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.
3. MENU
selects a menu.
4. OK
accepts your selection or displays the current mode.
5.
DD / EE
(Programme Up/Down)
selects a programme or a menu item.
switches the set on from standby.
FF / GG
(Volume Down/Up)
adjusts the volume.
adjusts menu settings.
6. REMOTE CONTROL SENSOR
Note : Only use the supplied remote control handset.
(When you use others, they’ll be not able to function.)
7. TV/AV
selects TV or AV mode.
clears the menu from the screen.
switches the set on from standby.
8. (Function)
selects volume, EYE (option), picture items or brief auto
programme while the menus not display.
Front panel
S-VIDEO
VIDEO
L/MONO RAUDIO
AV3
11
12
1
3
4
2 6
10
5
9. +/- (
DD/EE
)
adjusts the function or selects a programme.
switches the set on from standby.
10. EYE (option)
adjusts picture according to the surrounding conditions.
11.HEADPHONE SOCKET (option)
Connect the headphone plug to this socket.
12.AUDIO/VIDEO IN SOCKETS (AV3)
Connect the audio/video out sockets of external
equipment to these sockets.
S-VIDEO/AUDIO IN SOCKETS (S-AV) (option)
Connect the video out socket of an S-VIDEO VCR to
the S-VIDEO socket.
Connect the audio out sockets of the S-VIDEO VCR
to the audio sockets as in AV3.
Note : Do not place any heavy objects (over 4Kg) on the
RT-29FA33 series models..
RT-28FZ10 series
1
2
4
3
6
5
1
RT-29FA33 series
2
34
5 12
10
6 11
ON/OFF
MENU
O K
VOL VOL
PR
CT-25/29Q40 series
1
3
2 6
4
10
5
L/MONO R
AUDIO
VIDEO
AV3
S-VIDEO
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Fig. 2-1
Fig. 2-2
CPT
PCB
Remove
Screws
MAIN
PCB
CNTROL
PCB
DISASSEMBLY INSTRUCTIONS
Important note
This set is disconnected from the power supply through the
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).
Chassis Assy Removal
Grasp both side of Frame and pull it backward smoothly.
CPT Removal
1. Pull out the CPT board from the CPT neck.
2. Place the front cabinet on soft material not to mar the front
surface or damage control knobs.
3. Remove 4 screws securing the picture tube mounting
brackets to the front cabinet.
4. Carefully separate CPT from the front cabinet.
PICTURE TUBE HANDLING CAUTION
Due to high vacuum and large surface area of picture tube, great
care must be exercised when handling picture tube. Always lift
picture tube by grasping it firmly around faceplate.
NEVER LIFT TUBE BY ITS NECK! The picture tube must not be
scratched or subjected to excessive pressure as fracture of
glass may result in an implosion of considerable violence which
can cause personal injury or property damage.
POWER
PCB
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1. Safety Precautions
1. It is safe to adjust after using insulating transformer between
the power supply line and chassis input to prevent the risk of
electric shock and protect the instrument.
2. Never disconnect leads while the TV receiver is on.
3. Don't short any portion of circuits while power is on.
4. The adjustment must be done by the correct appliances.
5. Unless otherwise noted, set the line voltage to 230Vac
!10%,
50Hz.
6. The adjustment of TVshould be performed after warming up
for 15 minutes.
2. Test Equipment required
1. RF signal generator (with pattern generator)
2. DC Power Supply
3. Multimeter (volt meter)
4. Oscilloscope
5. Color analyzer
3.
DVCO
Adjustment
1) This is for adjustment of VCT38XX,crystal oscillator
frequency after receiving a company Digital
pattern.(PAL:EU05CH,NTSC:13CH)
2) When entering adjustment mode by pressing IN-START
button,DVCO adjustment is operating automatically.
(T/X doesn’t operating occassionally during DVCO
adjustment.)
4. Focus Adjustment
4-1. Preparation for Adjustment
Tune the TV set to receive a digital pattern.
4-2. Adjustment Method
1) Single Focus CPT
Adjust the upper Focus volume of FBT for the best focus of
horizontal line A,vertical line B.
2) Double Focus CPT
1) Adjust the lower Focus volume of FBT for the best focus of
vertical line B.
2) Adjust the upper Focus volume of FBT for the best focus of
area A.
3) Repeat above step 1) and 2) for the best overall focus.
5.
Screen Voltage & White Balance Adjustment
5-1. Adjustment of screen manually
(Using ADJ.Remote Control)
1) Receive the PAL or SECAM(NTSC) signal into RF mode
regardless of channel.
2) If you press the “ADJ”button in LINE SVC mode(IN-START
button),the LINE SVC mode changes to screen adjustment
mode.
3) Turn the Sreen Volume of FBT to change luminance of
White signal center as shown below.(Deviation ! 1FL)
4) Press the EXIT button (Like TV/AV) to exit SVC mode.
5-2.
Adjustment of white balance manually(LIne-SVC 1)
1) Tune the TV set to receive an 100% white pattern.
2) Adjust LOW LIght status of CUT R,CUT B at CUT G:50.
3) Adjust HIGH LIght status of WDR R,WDR B at WDR G:380.
4) Repeat above step 2) and 3) for the best condition each
status of High Light and Low Light.
NOTE : When adjusting white balance automatically,connect the
adjustment JIG in SVC mode.(When pressing INSTART,MUTE button on remote control for adjustment
orderly,it changes to SVC mode and screen displays
SVC.)
Luminance(Manual)
6
!
1FL
8
!
1FL
5
!
1FL
6
!
1FL
8
!
1FL
CPT & INCH
29” FLAT
25” FLAT
29” NORMAL
25” NORMAL
28” NORMAL
Note
Single Focus
ADJUSTMENT INSTRUCTIONS
Fig. 1
Menu
X
Y
Color Temperature
288
295
9000
o
K
268
273
13000
o
K
EU
N-EU
Menu
CUR R
CUR G
CUR B
WDR R
WDR G
WDR B
0 ~ 511
0 ~ 511
0 ~ 511
0 ~ 511
0 ~ 511
0 ~ 511
50
50
50
380
380
380
Range
DATA
White Balance Color analyzer
White Balance Initial Data
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6.Deflection Data Adjustment (Line SVC-2)
NOTE : How to enter into the Line Service Mode with a remocon.
1.Power off.
2.Press the Red button.
3.Press the Green button.
4.Press the Yellow button.
5.Press the Cyan button.
6.Press the OK button.
7.Power On.
6-1. Preparation for Deflection Adjustment
1) At adjustment mode(IN-START button on remote control of
adjustment),changed to LINE SVC 2 mode to adjust the
deflection.
2) Press Channel UP/DOWN button for desirous function
Adjustment.
3) Press Volume UP/DOWN button to adjust the data.
4) Tune the TV set to receive a Digital pattern.(PAL:05CH)
NOTE : If production line doesn’t the production line of LG
TV,receive available deflection adjustment pattern.
6-2. Adjustment Method
NOTE : First,adjust deflection at N50Hz,W50Hz,Z50Hz of PAL
signal.Then adjust deflection at N60Hz,W60Hz,Z60Hz of
NTSC signal.
In case of NTSC only model,adjust deflection of
N60Hz,W60Hz,Z60Hz of NTSC signal.
Store the deflection adjustment data in EEPROM by
using ENTER button before adjusting PIP position.
1) When adjusting a deflection,adjust N50Hz of PAL signal first and
adjust a deflection at W50Hz,Z50Hz,N60Hz,W60Hz,Z60Hz of PAL
signal.
2) Adjust a deflection as shown below
PAL 4:3=> PAL 16:9=>PAL ZOOM=>NTSC 4:3=>NTSC
16:9=>NTSC ZOOM.
3) After finishing deflection adjustment,press the ENTER button
to enter or exit in SVC mode.
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.
EW (Horizontal Width)
Adjust to that a digital circle pattern looks like exact circle.
EP (East-west Parabolar)
Adjust so that middle portion of the outermost left and right vertical
line looks like parallel with vertical lines of the CPT.
EC (East-west Coner)
Adjust so that the vertical line at every 4 corners of the screen
looks like parallel with the vertical lines of the CPT.
ET (East-west Trapezium)
Adjust to make the length of top horizontal line same with it of
the bottom horizontal line.
PIP (PIP Position)
Adjust until the distance between PIP and main picture
becomes about 1~2mm.
Fig. 2