LG PF-43A10 User manual

COLOR TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS
IN THIS MANUAL.
CHASSIS : MP-55A
MODEL : PF-43A10

- 2 -
CONTENTS
I. Contents...........................................................................................................................2
II. Safety Precautions......................................................................................................3
III. Servicing Precautions................................................................................................4
IV. Specifications................................................................................................................6
V. Control Descriptions..................................................................................................8
VI. Alignment/Test Point Location Guide ............................................................12
VII. Adjustment Instructions .......................................................................................16
VIII. Circuit Descriptions .................................................................................................23
IX. Trouble Shooting........................................................................................................33
X. Printed Circuit Boards ............................................................................................39
XI. Wiring Diagram ...........................................................................................................57
XII. Block Diagram..............................................................................................................61
XII. Exploded View............................................................................................................65
XIV. Replacement Parts List .........................................................................................68
XV. Schematic Diagram .......................................................................................................

- 3 -
SAFETY PRECAUTIONS
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in
the Schematic Diagram and Replacement Parts List.
It is essential that these special safety parts should be replaced with the same components as recommended in this manual to
prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
General Guidance
An 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

- 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.
d. Discharging the picture tube anode.
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. Discharge the picture tube anode only by (a) first connecting
one end of an insulated clip lead to the degaussing or kine
aquadag grounding system shield at the point where the
picture tube socket ground lead is connected, and then (b)
touch the other end of the insulated clip lead to the picture
tube anode button, using an insulating handle to avoid
personal contact with high voltage.
4. Do not spray chemicals on or near this receiver or any of its
assemblies.
5. 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 nonabrasive 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.
6. Do not defeat any plug/socket B+ voltage interlocks with
which receivers covered by this service manual might be
equipped.
7. 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.
8. 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.
9. Use with this receiver only the test fixtures specified in this
service manual.
CAUTION: Do not connect the test fixture ground strap to
any heatsink 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 fieldeffect
transistors and semicounductor "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
electostatic 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 sufficent to demage ES devices.
5. Do not use freon-propelled chemicals. These can generate
electrical charges sufficient to damage ES devices.
6. Do not remove a repalcement 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 ieads 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 bruching 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 maintan tip
temperature within the range or 500°F to 600°F.
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. Thorohly clean the surfaces to be soldered. Use a mall
wirebristle (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.
(500°F to 600°F)
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
circuiboard printed foil.
6. Use the following soldering technique.
a. Allow the soldering iron tip to reach a normal
temperature (500°F to 600°F)
b. First, hold the soldering iron tip and solder the strand
against the component lead until the solder melts.
SERVICING PRECAUTIONS

- 5 -
c. Qulckly 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.
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 parapraphs 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 boare.
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 heatsink 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 heatsink.
Diode Removal/Replacement
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.
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
involoves 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 -
SPECIFICATIONS
NOTE : Specifications and others are subject to change without notice for improvement.
●Video input system:
Multi 26 System
(Refer to Table 1)
●Intermediate Frequency
Vision IF : 38.0MHz
Color IF : 33.57MHz ※SECAM : 38.0-4.25MHz
34.42MHz(M) 38.0-4.40625MHz
Sound IF : 32.5MHz(B/G)
32.0MHz(I)
31.5MHz(D/K,K1)
33.5MHz(M)
●Tuning range
●OSD (On Screen Display):
Menu Method
●Antenna input impedance: VHF/UHF 75ohm, Unbalanced
●Voice coil impedance : 8 ohm
●External connections :
S-VIDEO (Super Video)
A/V in : 1 pair
S-VIDEO (Super Video)
Scart(Full)
A/V in : 1 pair
A/V out : 1 pair
External speaker out : 1 pair
●Power requirements :
100-270 Vac, 50/60HZ
●Power consumption :
210 Wmax.
●Tuning system :
VS (Voltage Synthesizer)
80 Program Memory
●Sound output :
12 W max. X 2 way: (4 speaker)
Dual / Stereo : A2, NICAM
●Local button :
Menu, OK, TV/AV, POWER
Volume up(+), down(-)
Program up(+), down(-)
●Function :
Auto Program
Manual Program
Auto Sleep
Real Clock
CATV/Hyper band
Teletext (TOP/FLOF/LIST)
PIP (Picture In Picture)
Child Lock :
In the Lock On state the TV can only be operated by the
remote controller.
If any button on the front panel is pressed, "CHILD LOCK ON" is
displayed on the screen but the button's function is not
performed.
To cancel of this mode, select lock off with menu button on
remote controller only.
●Features
Picture quality improvement circuit
- YNR (Luminance Noise Reduction)
- Picture Outline Compensation
Band
VHF-Low
VHF-High
UHF
PAL/SECAM-B/G
For TV
Ch 2-4
Ch 5-12
Ch 21-69
For CATV
S1’-S3’, S1
S2-S10
S11-S20
S21-S41
Hyper
Front
Rear
Video in/out
Audio in (2 way)
Audio out (2 way)
R. G. B in
Specifications
1Vp-p±3dB, 75ohm
0.5Vrms±3dB, over 10Kohm
0.5Vrms±3dB, below 1Kohm
0.7Vp-p±3dB
(

- 7 -
Table 1 : Receiving System (26 System)
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
Receiving System
PPAALL--BB
PPAALL--GG
PPAALL--II
PPAALL--DD
PPAALL--KK
SSEECCAAMM--BB
SSEECCAAMM--GG
SSEECCAAMM--DD
SSEECCAAMM--KK
SSEECCAAMM--KK11
NNTTSSCC--MM
NTSC 4.43/5.5MHZ
NTSC 4.43/6.0MHZ
NTSC 4.43/6.5MHZ
SECAM-I (6.0MHZ)
SECAM-L (Video In)
NTSC 3.58/4.5MHZ/50HZ
PAL 5.5MHZ/60HZ
PAL 6.0MHZ/60HZ
PAL 6.5MHZ/60HZ
SECAM 5.5MHZ/60HZ
SECAM 6.0MHZ/60HZ
SECAM 6.5MHZ/60HZ
NTSC 3.58/5.5MHZ
NTSC 3.58/6.0MHZ
NTSC 3.58/6.5MHZ
Receiving Channel
VVHHFFBBaanndd
PAL/SECAM-B ::22--1122
PAL/SECAM-D ::11--1122
SECAM-K1 ::22--99
NTSC-M (US) ::22--1133
NTSC-M (JAPAN) ::11--1122
UUHHFFBBaanndd
PAL/SECAM-G ::2211--6699
PAL-I ::2211--6699
SECAM-K ::2211--6699
PAL-K ::1133--5566
NTSC-M (US) ::1144--7788
NTSC-M (JAPAN) ::1133--6622
Function
Reception of broadcast and play-
back for Video Tape Recorder
Play-back for special Video Tape
Recorder
Play-back for special Video
tape/Video disk player
Play-back for special Video Tape
Recorder

- 8 -
CONTROL LOCATIONS
Front
S-VIDEO
AV 2
VIDEO (L)-AUDIO-(R)
(MONO)
(MONO)
AV 2 S-VIDEO VIDEO (L)-AUDIO-(R)
TV/AV MENU OK VOL PR POWER
STAND-BY
NO.
1
2
3
4
5
6
7
Descriptions
To select TV or AV mode.
To select a menu.
To accept your selection or to display the current mode.
To adjust the volume or menu settings.
To switch the set on from stand-by.
To select a program or a menu item.
To switch the set on from stand-by mode.
To illuminate when the set is in stand-by mode.
Name of button
TV/AV
MENU
OK
VOLUME DOWN/UP
PROGRAM DOWN/UP
POWER
STAND-BY INDICATOR
1 2 3 4 5 6 7
Remote Control Sensor
S-VIDEO JACK

- 9 -
Rear Panel
(R)
( ) ( )
(L)
3
(R)
( ) ( )
(L)
EXT SP
(8Ω)
EXT
INT SPEAKER
75Ω
OUT
IN
(R) (L)
AUDIO
S-VIDEO
MAIN
POWER
VIDEO
AV3
AV1

- 10 -
REMOCON 1. POWER
switches the set on from stand-by or off to stand-by.
2. MUTE
switches the sound on or off.
3. UNIT
selects single or double digit.
4. NUMBER BUTTONS
switch the set on from stand-by or directly select a number.
5. PIP BUTTONS
PIP
switches the sub picture on or off.
INPUT
selects the input mode for the sub picture.
SWAP
alternates between main and sub pictures.
STILL
freezes motion of the sub picture.
POSITION
relocates the sub picture in clockwise direction.
SIZE
adjusts the sub picture size.
PR+/-
selects a program for the sub picture.
6. SSM (Sound Status Memory)
recalls your preffered sound setting.
7. PSM (Picture Status Memory)
recalls your preffered picture setting.
8. VCR BUTTONS
control a GoldStar video cassette recorder.
9. TV/AV
selects TV or AV mode.
10. MENU
selects a menu.
11. ▲/▼(Program Up/Down)
switches the set on from stand-by.
selects a program or menu item.
◀/▶(Volume Down/Up)
adjusts the volume.
adjusts menu settings.
OK
accepts your selection or displays the current mode.
12. TELETEXT BUTTONS
These buttons are used for the teletext.
13. DUAL
selects the language during dual language broadcast.
selects mono sound during stereo broadcast.
14. SLEEP
sets the sleep timer.
Note: In teletext mode, the PR+/-, SWAP, INPUT, SIZE, STILL and
POSITION buttons are used for teletext function.
123
456
789
0
OK
VOL VOL
POWER REW PLAY FF
CH
- CH+ STOP REC
TV/AV
MENU
PIP
MUTE POWER
TEXT
PR- PR+ SWAP INPUT
PSM
SIZE STILL POSITION
PIP
SSM DUAL SLEEP
PR
PR
M
T
X
T
1
2
3
4
5
5
7
6
8
123
456
789
0
OK
VOL VOL
POWER REW PLAY FF
CH
- CH+ STOP REC
TV/AV
MENU
PIP
MUTE POWER
TEXT
PR- PR+ SWAP INPUT
PSM
SIZE STILL POSITION
PIP
SSM DUAL SLEEP
PR
PR
M
T
X
T
10
9
11
13
14
12
12

- 11 -
MENU REFERENCE
CONVERGENCE
This function enables you to adjust the colour convergence of screen during receiving the signals. When the set is first installed or it
is relocated, the picture may be unstable with three colour ghosts (red, green, blue). This problem can be solved by adjusting the
colour convergence.
MENU 1 MENU 2 MENU 3 MENU 4
‚100OCONTRASTOOOOOOOO
'O50OBRIGHTOOOOOOOO
·O50OCOLOROOOOOOOO
≥O60OSHARPNESSOOOOOOO
OOOOOO
¡OK MENU™
¶O50OTREBLEOOOOOOOO
∞O50OBASSOOOOOOOO
¢O0OBALANCEOOOOOOO
OOFFOSURROUNDOOOOOOO
OOFFFUBBOOOOO
¡OK MENU™
INPUTOOOOOOOOOO:TV
CHILDOLOCKOOOOO:OFF
SOUNDOSYSTEMOOO:BG¡5.5™
COLOROSYSTEMOOO:AUTO
NOISEOREDUCTION:OFF
¡™OTOOSELECT
¡ ™™TOOCHANGE
CLOCKOSSET
ONOOTIMEOSET
OFFOTIMEOSET
AUTOOSSLEEP
CONVERGENCE
¡™OTOOSELECT
¡OK™ OOTOOSET
Note:
1. The menus automatically disappear in about 10 seconds if you do not press a button.
However if you press the MENU button again, the last selected menu is displayed on the
screen of the TV.
2. After selecting the menu, if you want to save the results, press the button OK.
3. In the AV mode, MENU 5 and SOUND SYSTEM of MENU 3 are not displayed.
4. In the teletext mode, only MENU 1 and 2 are displayed.
SHARPNESS of MENU 1 is not displayed.
MENU 5
TV PROGRAM
FINE TUNING
AUTO PROGRAM
MANUAL SEARCH
PROGRAM EDIT
¡™OTOOSELECT
¡OK™ OOTOOSTART
1. Press the MENU button to select MENU 4.
2. Press the ▲/▼button to select CONVERGENCE.
3. Press the OK button to display the CONVERGENCE
mode. If the display ++and ◀▲▼▶ are unstable with
three colour ghosts, the colour convergence needs to
be adjusted.
If the display is white, colour convergence adjustment is
not necessary.
4. Press the TV/AV button to adjust the colour
convergence.
The display ◀▲▼▶ is selected in red.
Press it again to select the display ◀▲▼▶ in blue.
5. Press the ▲/▼and ◀/▶buttons to superimpose the
display ++(red or blue) with the green one. The display ++
is moved to the left (◀◀), right (▶▶), up (▲▲) or down
(▼▼) by pressing the ◀, ▶, ▲, ▼buttons.
6. If the red and blue display ++are superimposed with the
green one, the display ++will be changed to white.
7. Press the OK button to return to normal TV viewing.
CONVERGENCE
CONVERGENCE
◀▲▼▶

ALIGNMENT/TEST POINT LOCATION GUIDE
SIGNAL Board (Component side)
SMPS Board (Component side)
- 12 -
P800BP
P400AP
TP01A
P901AP
P900AP
P902AP
P04AP
P02AP
P03AP
P604RB
P604LB MSW601
IC603
IC700
IC500
IC200
IC1011
IC1 IC2
IN
OUT
IC204
IC501
IC3
TUNER
IC600
IC605
IC601
IC604
P600 P601
RF501
P103A P102A P101A
P502AP P401AP P756AP P01AP
R801BP
P801AF
IC822
P800AP
P801AP
P113B
IC805
P802BF
DF-ADJ
VR351
IC802
IC881
IC880
T802
T801
IC821
IC801

CONVERGENCE & CRT(R, G, B) Board (Component Side)
DEFLECTION Board (Component Side)
- 13 -
P752B
P755B
P753G
P752G
P756B
P754G P755G
SCREEN B
VR900B
IC1103
SCREEN G
VR900G
G DRIVE
VR928G
P751R P753R
P754R
SCREEN R
VR900R
P114A
P111A
P112BP
IC1101 IC1102
P115B
P111B
R DRIVE
VR928R
BV
SIZE
RH
VR1101 LIN VR1102 SKEW VR1113 KEYS VR1114
S-SKEW
VR1133
S-BOW
VR1144
BOW
VR1115
M.LIN.S
VR1152
M.LIN.L
VR1153
M.WAVE
VR1164
WAVE-A
VR1165
WAVE-U
VR1171
PIN
H.M.PIN
VR1132
GV VR1104 VR1116 VR1117 VR1135 VR1145VR1118 VR1154 VR1166 VR1167 VR1172 VR1174
VR1175
VR1176
VR1134
RV VR1105 VR1106 VR1119 VR1120 VR1137 VR1146VR1121 VR1155 VR1156 VR1168 VR1169 VR1173VR1136
BH VR1107 VR1108 VR1122 VR1123 VR1139 VR1147 VR1148VR1124 VR1157 VR1158VR1138
GH VR1110 VR1125 VR1126 VR1141 VR1149VR1127 VR1159 VR1160VR1140
VR1111 VR1112 VR1128 VR1129 VR1143 VR1150 VR1151VR1130 VR1161 VR1162
IC1113
VR1170VR1142
IC1112 IC1111 IC1105
IC1107
IC1104
IC1106
IC1108
IC1110
IC1109
P114B
IC1114 P113AP
IC1115
IC1116
I C2003 I C2002 I C2001
P401BP
P113BP
P400BP
H-SIZE
VR404
P802AFP801BF
CY-R
CY-B CY-G
P112AP
IN
OUT
P422AP
DY-R DY-G DY-B
P06
Q422
P05
P07 P403
T422
FBT
IC302
Q405
IC301
V-SIZE
B+ ADJ
VR422
IC423
J87
TP1
VR301

PIP Board (Component Side)
IF Board (Component Side)
- 14 -

- 15 -
SCART/POW-SW Board (Component Side)
TXTBoard (Component Side)
MSW801
P901
P901BP
P902BP
P900BP
IC901
TI 01 TI02
TP01
TI 04
OUT IN
TI 05

ADJUSTMENT INSTRUCTIONS
󱇲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. Don't operate the TV with a non-moving picture for any
more than 10 minutes as damage may occur to the phosphor
on the CRT.
5. The adjustment must be done by the appropriate appliances
and the correct step.
6. Unless otherwise noted, set the line voltage to 220V ±10%,
50Hz.
󱇲Test Equipment required
1. VIF sweep generator
2. Color bar/cross-hatch pattern generator
3. DC power supply
4. Digital multi-meter
5. Color analyzer
NOTE :
: PIP Board
●VCO (Voltage Controlled Oscillator)
Adjustment
1) Turn on DC power supply.
2)
Adjust Video Detector Coil (L9T/ L8P ) so that a waveform
on Alignment Scope is the same as below Fig.2.
●AFT (Auto Fine Tuning) Adjustment
1) Turn on DC power supply.
2) Adjust IF AFT coil (L8T/ L9P ) so that 38.0MHz (Vc) point
may be centered as Fig.3.
- 16 -
Preparation for VCO & AFT Adjustment
1. Connect the measuring equipment to the TV as shown in
Fig.1.
2. Set RF output level of Sweep S.G (Signal Generator) to
80dBuV.
3. Set Alignment Scope, Volts/Div to 100mV (VCO) or
1V(AFT), AC/DC switch to AC, Line/Ext switch to Ext.
IC2P
IC1P
VR1P
AGC
TP25 TP23
TP24
TP20
TP22
TP21
L9P
AFT
L8P
VCO
P502B
P2B
P2B
TU2P
J21P
AGC TP
IF Board (Component side view)
PIP Board (Component side view)
NOTE: TP point is on the copper side of PCB.
DC POWER
SUPPLY
12 0.1V
SWEEP S.G.
with Marker
(VP-8800G)
Alignment
Scope
+
-
To TP2/ TP21
To TP1/ TP20
To TP6/ TP22
To Pin5 of P101B
/ Pin7 of P1B
To TP5/ TP24
VCO : ON
AFT : OFF
3.3K
1K
4.7K
0.01µF
(VCO)
(AFT)
Fig.1 : Connection Diagram of Equipment for
VCO & AFT Adjustment.
ABC D EFG
A : 30.0MHz
B : 31.5MHz
C : 32.84MHz
D : 36.8MHz
E : 38.0MHz
F : 39.5MHz
G : 40.25MHz
Test Point : TP6 / TP22
Adjust : L9T / L8P
Test Point : PIN5 of P101B / PIN7 of P1B
Adjust : L8T / L9P
Fig.2 : VCO waveform on Alignment Scope
IC1S
IC1T
VR1T
AGC
TP6
TP1
TP3
TP2
TP5
TP4
L9T
VCO
L8T
AFT
P102BP103B P101B

●RF AGC (Auto Gain Control) Adjustment
The RF AGC control (VR1T/ VR1P ) was aligned at the time of
manufacture for optimum performance over a wide range
conditions. Readjust of VR1T/ VR1P should not be necessary
unless unusual local conditions exist, such as:
1) Channel interference in a CATV system.
2) Picture bending and/or color beats, which are unusually
due to excessive RF signal input when the receiver is too
close to a transmitting tower or when the receiver is
connected to an antenna distribution system where the
RF signal has been amplified. In this case, the input signal
should be attenuated(with pad or filter) to a satisfactory
level.
3) Picture noise caused by "broadcast noise" or weak signal.
If the broadcast is "clean" and the RF signal is at least
1mV(60dBuV), the picture will be noise free in any area.
Adjusting the VR1T/ VR1P (RF AGC) control to one end of
rotation will usually cause a relatively poor signal to noise ratio;
Adjusting to the other end of rotation will usually cause a
degradation of over load capabilities resulting in color beats or
adjacent channel reference.
For best results, adjust the VR1T/ VR1P control while
performing on all over local channels, or the voltage at J105/
J22P will be 5.6±0.2Vdc in RF level 60±2dBuV.
●High Voltage Stabilization Adjustment
1) Tune the TV set to receive a digital pattern.
2) Set contrast to 100%, brightness and color to 50%
respectively.
3) Adjust VR422 on the deflection board so that the DC
voltmeter may be read 4.0±0.2Vdc.
●Vertical/Horizontal Size Adjustment
1) Tune the TV set to receive a digital pattern.
2) Set contrast to 100%, brightness and color to 50%
respectively.
3) Adjust VR301 on the deflection board so that the circle of
the digital pattern may be located within the effective
screen on the TV screen.
4) Adjust VR404 on the deflection board so that the circle
of the digital pattern looks like exact circle.
●Horizontal center/SUB/SECAM Adjustment
Adjustment procedures
1) Tune the TV set to receive a digital pattern unless
otherwise noted.
2) Press OK button on Control Board continuously and
SWAP(yellow) button on remote controller then you can
fine On Screen Display. (Refer to the following fig.4)
3) Press PR+ or PR- button for desirous function adjustment.
4) Press VOL+ or VOL- button for correct picture.
5) Press OK button to memorize all the adjusted data.
Fig. 4
Horizontal center adjustment
Adjust so that the horizontal center line of digital pattern is in
accord with geometric horizontal center on the screen.
- 17 -
A
B
A: 36.8MHz
B: 38.0MHz
Fig.3: AFT waveform on Alignment Scope
Test Point : J105(on Signal Board) / J22P
Adjust : VR1T / VR1P
Test Point : TP1 (on Deflection Board)
Adjust : VR422
Test Point : Observing Display
Adjust : VR301 (Vertical Size)
VR404 (Horizontal Size)
NOTE : These adjustments are already aligned at the
time of manufacture for optimum performance.
Readjust of them should not be necessary
unless IC1 (EEPROM) is defective. Because all
the information of these adjustment are
memorized in that IC.
[ LINE SVC 1 ] PR * *
H-CENTER 15
SUB BRIGHT 20
COLOR 10
TINT 10
SECAM BELL 05
R-Y 08
B-Y 14
AMP 02

- 18 -
SUB BRIGHT/COLOR/TINT adjustment
NOTE : This adjustment should be performed after White
Balance adjustment.
1) Tune the TV set to receive a broadcasting signal.
2) Adjust so that the brightness/color/TINT(for NTSC) is
optimum condition on the screen.
SECAM BELL filter adjustment
1) Tune the TV set to receive a SECAM digital pattern.
2) Adjust so that the cross-color on the 3.8MHz pattern is
minimized.
SECAM R-Y/B-Y adjustment
1) Tune the TV set to receive a SECAM digital pattern.
2) Adjust so that the background color is equal to the PAL
background color.
SECAM AMP adjustment
1) Tune the TV set to receive a SECAM digital pattern.
2) Adjust so that the level of SECAM color is equal to the
level of PAL color.
NOTE : If press OK button on Control Board continuously and
press continually two times SWAP (yellow) button on
remote controller then you can find On Screen Display
as follow Fig.5.
※Never change these data, these are important
reference data for TV.
Fig. 5
● Cut-off & White Balance (color temperature)
Adjustment
NOTE : This adjustment should be performed after
warming up for 15 minutes at least.
1) Set VR900R, 900G, 900B, 928R, 928G on CRT Boards to
the mechanical center position.
2) Tune the TV set to receive white pattern of PAL
standard signal.
3) Press OK button on Control Board continuously and
INPUT(blue) button on remote controller for obtaining a
horizontal line on the middle of TV screen.
4) Turn VR900R, 900G, 900B counterclockwise and set it to
the minimum position.
5) Turn VR900R, 900G, 900B clockwise slowly to appear a
horizontal line.
6) Adjust Cut-off volume (VR900R, 900G, 900B) so that the
horizontal line may become white.
First, except the appeared color on the horizontal line
with one volume and then make to be white line with the
other two volume.
7) Press OK button.
8) With a color analyer (white balance checker), adjust
VR928R and VR928G on the CRT Boards to set X position
to 285±2 and Y position to 290±2.
9) By varing contrast and brightness, whether you have
good adjustment in high and low light areas on the screen.
If not, re-adjust above setp 3)~8).
● X-RAY PROTECTOR Test
Input 5V DC to point A and check if the TV set goes off.
[ LINE SVC 2 ] PR * *
PEAK LIMITER OFF
P/N GP INTIAL
SECAM GP INTIAL
P/N AMP 0
AV-IN VOL 044
FM PRESCALE 031
NICAM VOL 108
SCART VOL 040
Test Point : Observing Display
Adjust : VR900R, 900G, 900B (Cut-off)
VR928R, 928G (White balance)
12V
ABNORMAL
A
X-ray
Protector
R409
3.9K
C405
4.7
50V
R405
18K
Q428
A1266
R401
1K
R402
10K
ZD441
3.6V
C404
10
16V
R406
1.2K
1SD2471
D410
Q427
C3198

Caution :
These adjustments have been factory aligned. Do not attempt
to temper with these alignments. However, the effects of
adjacent receiver components, or replacement of picture tube
or deflection yoke may require the need to readjust these
adjustments.
●Raster Slant Adjustment
1. Preliminary steps
1) The lens focus and electrical focus must be provisional
alignment.
2) Disconnect P115B.
3) Tune the TV set to receive a digital pattern.
2. Adjustment
1) Set only green to be appeared on the screen.
2) Carefully rotate the DY of the green CRT so that the slant
of raster become the following figure.
3) Set two color (R or B and G) to be appeared on the
screen.
4) Set the slant of Red or Blue correspond to the green.
Note :
5) Connect P115B after finishing adjustment.
●Raster Position Adjustment
1. Preliminary steps
1) The lens focus and electrical focus must be provisional
alignment.
2) This adjustment should be performed after the raster
slant, the horizontal and the vertical adjustment.
3) Tune the TV set to receive a digital pattern.
2. Adjustment
1) Turn the centering magnet of Green CRT so that the
center of video signal correspond to geometrical center
of screen.
2) Tune the TV set to receive cross hatch signal and turn the
centering magnet of Red & Blue so that the center of
cross hatch pattern correspond to Green center.
● Lens and Electrical Focus Adjustment
1. Preliminary steps
1) The electrical focus, the raster slant and position must be
provisional alignment.
2) This adjustment should be performed after warming up
for 30 minutes and in the dark room.
3) Tune the TV set cross hatch pattern.
4) Screen the optional two lens with a cover so that the
single color is appeared on the screen.
5) When turn the light the lens at front, chromatic aberration
which appeared in bright line of cross-Hatch signal
changed as below.
※After focus adjustment, fix screw about 12~17kg.cm.
2. G-lens Adjustment
1) Turn the lens until the chromatic aberration changed 'Blue'
to 'Red point'.
2)
Viewing the all screen, in no case of the chromatic aberration
appeared slimly within 3.5 cross-Hatch of the picture center.
At this time, in case that the red chromatic aberration's bright
line isn't equal, adjust G-lens so that the red chromatic
aberration is appeared more than previous time.
3) Switching the signal to digital pattern and operate
adjustment minutely. At this time, adjust it by using the
revolution pattern of circumferencial picture's small circle.
4) Adjust G-focus control volume of focus pack so that the
external big circle's part appeared cleary.
5) Adjust accurately by repeat the upper control.
6) Especially, noting to the G-light because it influenced on
picture's function.
3. R-lens Adjustment
1) Turn the lens until the chromatic aberration changed
orange to scarlet.
2) Adjust the chromatic aberration so that it located center
correctly.
3) Switching the signal to digital pattern and adjust it as
same method of G-lens.
4) Adjust as same method of G-lens with Red focus control
volume of focus pack.
- 19 -
RASTER SLANT/POSITION, FOCUS & CONVERGENCE ADJUSTMENT
LL
Mechanical
center
1. Tighten the tighten iron after loose completely
tighten iron which fixing DY when adjusting raster
slant and set position.
2. Never control to the tighten iron which fixed, it's
condition is not untied.
Lens
Red
Green
Blue
Change of chromatic aberration
Orange 󱈇Scarlet
Blue 󱈇Red
Purple 󱈇Green
CHROMATIC
ABERRATION
CROSS HATCH
SIGNAL
L ≤2mm

- 20 -
4. Blue lens Adjustment
1) Turn the lens until the chromatic aberration changed
purple to green which of 3.5 Cross-Hatch part from
picture's center toward left.
2) Adjust the chromatic aberration become center of purple
and green.
3) Turn the VR to clockwise so that the thickness of B-
bright line thicker than G-bright line as much as times of
1.3 ±0.2 after control method as same of G-focus by B-
focus VR of focus pack.
4) Remove lens cover after adjusting all lens (R.G.B) and
receive cross hatch signal, observing condition of whole
screen's condition.
●Convergence Adjustment
1. Preliminary steps
1) This adjustment should be performed after raster slant,
raster position, horizontal and vertical adjustment.
2) This adjustment should be performed after warming up
30 minutes.
3) Tune the TV set cross-hatch pattern.
2. G-Convergence Adjustment
1) Screen the R and B lens with a cover so that the green
is appeared on the screen.
2) Set VR1131, 1163, 1170, 1175, 1148 and 1151 to the
mechanical center position.
3) Adjust V-BOW volume VR1118.
4) Adjust V-SKEW volume VR1116.
5) Adjust V-WAVE.A volume VR1167.
※Adjust VR1172 and VR1167 together for delicate
alignment.
6) Adjust H-BOW volume VR1127.
7) Adjust H-SKEW volume VR1125.
8) Adjust V-PINCUSHION volume VR1134.
※Adjust VR1145 and VR1134 together for delicate alignment.
9) Adjust H-PINCUSHION volume VR1140.
※Adjust VR1149 and VR1140 together for delicate
alignment.
10) Adjust V-KEYSTONE volume VR1117.
※Adjust VR1135 and VR1117 together for delicate alignment.
11) Adjust H-KEYSTONE volume VR1126.
※Adjust VR1141 and VR1126 together for delicate alignment.