LG 29FU1RL User manual

COLOR TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : CW62C
MODEL : 29FU1RL
MODEL : 29FU1RL-T1
Apr., 2009
Printed in ChinaP/NO : MFL37773222
North/ Latin America http://aic.lgservice.com
Europe/Africa http://eic.lgservice.com
Asia/Oceania http://biz.lgservice.com
Internal Use Only

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes. LGE Internal Use Only
- 2 -
CONTENTS
SAFETY PRECAUTIONS .........................................................................................................................................................................3
ADJUSTMENT INSTRUCTIONS ..............................................................................................................................................................4
PURITY & CONVERGENCE ADJUSTMENT ..........................................................................................................................................10
SVC REMOCON......................................................................................................................................................................................13
TROUBLESHOOTING.............................................................................................................................................................................14
BLOCK DIAGRAM ...................................................................................................................................................................................18
EXPLODED VIEW....................................................................................................................................................................................20
SCHEMATIC DIAGRAM .............................................................................................................................................................................
PRINTED CIRCUIT BOARD........................................................................................................................................................................
COMPONENT LOCATION GUIDE..............................................................................................................................................................
SPECIFICATIONS
POWER INPUT ...................................................................................................................................................... AC100-240V~50/60Hz
POWER CONSUMPTION ................................................................................................................................................................135W
ANTENNA INPUT IMPEDANCE ...................................................................................................................VHF/UHF 75 ohm Balanced
CHANNEL RANGE
VHF ................................................................................................................................................................................................. 2-13
UHF ................................................................................................................................................................................................ 14-69
CATV(125) ..................................................................................................................................................................01, 02~13, 14~125
INTERMEDIATE FREQUENCIES
Picture I-F carrier frequency ......................................................................................................................................................45.75MHz
Sound I-F carrier frequency ....................................................................................................................................................41.25 MHz
Color Sub-carrier frequency .................................................................................................................................................... 42.17 MHz
Center frequency ..........................................................................................................................................................................44 MHz
CHASSIS CONSTRUCTION.................................................................................................................................... IC-Solid state chassis
PICTURE TUBE ................................................................................................................................................ Type No. : A68ERS870X
SOUND OUTPUT ............................................................................................................................................................................... 10W
CABINET ......................................................................................................................................................................................... Plastic
ABBREVIATIONS: Used in this book
ADJ ...............................................................Adjustment or Adjust
AFC .................................................Automatic Frequency Control
AGC.......................................................... Automatic Gain Control
AMP .................................................................................Amplifier
CRT .................................................................Cathode Ray Tube
DEF ............................................................................... Deflection
DET.................................................................................. Detector
FBT............................................................... Flyback Transformer
H.V............................................................................ High Voltage
OSC................................................................................ Oscillator
SEP................................................................................ Separator
SYNC................................................................... Synchronization
S.I.F.............................................. Sound Intermediate Frequency
V.I.F ...............................................Video Intermediate Frequency
H ....................................................................................Horizontal
V ........................................................................................Vertical
IC ......................................................................Intergrated Circuit
OSD .................................................................On-Screen Display
SAP ......................................................... Second Audio Program
BPF .....................................................................Band Pass Filter
ST ...................................................................................... Stereo
LPF .......................................................................Low Pass Filter
DP .................................................................... Differential Phase
DG .....................................................................Differential Group
PLL ................................................................ Phase Locked Loop
APC ......................................................Automatic Picture Control
BM ....................................................................................B+ Main
BT .................................................................................B+ Tuning

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes. LGE Internal Use Only
- 3 -
SAFETY PRECAUTIONS
1. Before returning an instrument to the customer, always make a safety
check of the entire instrument, including, but not limited to, the
following items:
a. Be sure that no built-in protective devices are defective and/or have
been defeated during servicing. (1) Protective shields are provided on
this chassis to protect both the technician and the customer. Correctly
replace all missing protective shields, including any removed for
servicing convenience. (2) When reinstalling the chassis and/or other
assemblies in the cabinet, be sure to put back in place all protective
devices, including, but not limited to, nonmetallic control knobs,
insulating fishpapers, adjustment and compartment covers/shields, and
isolation resistor/capacitor networks. Do not operate this instrument
or permit it to be operated without all protective devices correctly
installed and functioning.
b. Be sure that there are no cabinet openings through which an adult or
child might be able to insert their fingers and contact a hazardous
voltage. Such openings include, but are not limited to, (1) spacing
between the picture tube and the cabinet back, (2) excessively wide
cabinet ventilation slots, and (3) an improperly fitted and/or incorrectly
secured cabinet back cover.
c. Antenna Cold Check-With the instrument AC plug removed from any
AC source, connect an electrical jumper across the two AC plug prongs.
Place the instrument AC switch in the on position. Connect one lead of
an ohmmeter to the AC plug prongs tied together and touch the other
ohmmeter lead in turn to each tuner antenna input exposed terminal
screw and, if applicable, to the coaxial connector. If the measured
resistance is less than 1.0 megohm or greater than 5.2 megohm, an
abnormality exists that must be corrected before the instrument is
returned to the customer. Repeat this test with the instrument AC
switch in the off position.
d. Leakage Current Hot Check-With the instrument completely
reassembled, plug the AC line cord directly into a 120 V AC outlet.
(Do not use an isolation transformer during this test.) Use a leakage
current tester or a metering system that complies with American
National Standards Institute (ANSI) C101.1 Leakage Current for
Appliances and Underwriters Laboratories (UL) 1410, (50.7). With the
instrument AC switch first in the on position and then in the off position,
measure from a known earth ground (metal waterpipe, conduit, etc.) to
all exposed metal parts of the instrument (antennas, handle bracket,
metal cabinet, screwheads, metallic overlays, control shafts, etc.),
especially any exposed metal parts that offer an electrical return path to
the chassis. Any current measured must not exceed 0.5 milliamp.
Reverse the instrument power cord plug in the outlet and repeat the
test.
ANY MEASUREMENTS NOT WITHIN THE LIMITS SPECIFIED HEREIN
INDICATE A POTENTIAL SHOCK HAZARD THAT MUST BE
ELIMINATED BEFORE RETURNING THE INSTRUMENT TO THE
CUSTOMER.
e. X-Radiation and High Voltage Limits-Because the picture tube is the
primary potential source of X-radiation in solid-state TV receivers, it is
specially constructed to prohibit X-radiation emissions. For continued X-
radiation protection, the replacement picture tube must be the same
type as the original. Also, because the picture tube shields and mounting
hardware perform an X-radiation protection function, they must be
correctly in place.
High voltage must be measured each time servicing is done that
involves B+, horizontal deflection, or high voltage. Correct operation of
the X-radiation protection circuits also must be reconfirmed each time
they are serviced. (X-radiation protection circuits also may be called
"horizontal disable" or "hold-down.") Read and apply the high voltage
limits and, if the chassis is so equipped, the X-radiation protection circuit
specifications given on instrument labels and in the Product Safety & X-
radiation Warning note on the service data chassis schematic.
High voltage is maintained within specified limits by close-tolerance
safety-related components/adjustments in the high-voltage circuit.
If high voltage exceeds specified limits, check each component
specified on the chassis schematic and take corrective action.
2. Read and comply with all caution and safety-related notes on or inside
the receiver cabinet, on the receiver chassis, or on the picture tube.
3. Design Alteration Warning- Do not alter or add to the mechanical or
electrical design of this TV receiver. Design alterations and additions,
including, but not limited to, circuit modifications and the addition of
items such as auxiliary audio and/or video output connections, might
alter the safety characteristics of this receiver and create a hazard to
the user. Any design alterations or additions will void the manufacturer's
warranty and will make you, the servicer responsible for personal injury
or property damage resulting therefrom.
4. Picture Tube Implosion Protection Warning-The picture tube in this
receiver employs integral implosion protection. For continued implosion
protection, replace the picture tube only with one of the same type and
number. Do not remove, install, or otherwise handle the picture tube in
any manner without first putting on shatterproof goggles equipped with
side shields. People not so equipped must be kept safely away while
picture tubes are handled. Keep the picture tube away from your body.
Do not handle the picture tube by its neck. Some "in-line" picture tubes
are equipped with a permanently attached deflection yoke; because of
potential hazard, do not try to remove such "permanently attached"
yokes from the picture tube.
5. Hot Chassis Warning-a. Some TV receiver chassis are electrically
connected directly to one conductor of the AC power cord and may be
safely serviced without an isolation transformer only if the AC power
plug is inserted so that the chassis is connected to the ground side of
the AC power source. To confirm that the AC power plug is inserted
correctly, with an AC voltmeter measure between the chassis and a
known earth ground. If a voltage reading in excess of 1.0 V is obtained,
remove and reinsert the AC power plug in the opposite polarity and
again measure the voltage potential between the chassis and a known
earth ground. b. Some TV receiver chassis normally have 85 V AC (RMS)
between chassis and earth ground regardless of the AC plug polarity.
These chassis can be safely serviced only with an isolation transformer
inserted in the power line between the receiver and the AC power
source, for both personnel and test equipment protection. c. Some TV
receiver chassis have a secondary ground system in addition to the main
chassis ground. This secondary ground system is isolated from the AC
power line. The two ground systems are electrically separated by
insulating material that must not be defeated or altered.
6. Observe original lead dress. Take extra care to assure correct lead
dress in the following areas: a. near sharp edges, b. near thermally hot
parts- be sure that leads and components do not touch, c. the AC
supply, d. high voltage, and e.antenna wiring. Always inspect in all areas
for pinched, out-of-place, or frayed wiring. Do not change spacing
between components, and between components and the printed circuit
board. Check the AC power cord for damage.
7. Components, parts, and/or wiring that appear to have overheated or are
otherwise damaged should be replaced with components, parts, or
wiring that meet original specifications. Additionally, determine the
cause of overheating and/or damage and, if necessary, take corrective
action to remove any potential safety hazard.
8. PRODUCT SAFETY NOTICE
Some electrical and mechanical parts have special safety related
characteristics which are often not evident from visual inspection, nor can
the protection they give necessarily be obtained by replacing them with
components rated for higher voltage, wattage, etc. Parts that have
special safety characteristics are identified by shading, by a ,or by
on schematics and parts lists. Use of a substitute replacement that does
not have the same safety characteristics as the recommended
replacement parts might create shock, fire, and/or other hazards. Product
safety is under review continuously and new instructions are issued
whenever appropriate.
DEVICE
UNDER
TEST
TEST ALL
EXPOSED METAL
SURFACES
2-WIRE CORD
ALSO TEST WITH
PLUG REVERSED
(USING AC ADAPTER
PLUG AS REQUIRED)
EARTH
GROUND
LEAKAGE
CURRENT
TESTER
(READING SHOULD
NOT BE ABOVE
0.5mA)
+-
AC Leakage Test

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes. LGE Internal Use Only
- 4 -
1. Application Object
These instructions are applied to CW-62A/C chassis.
2. Notes
(1) Because this is not a hot chassis, it is not necessary to use
an isolation transformer. However, the use of isolation
transformer will help protect test instrument.
(2) Adjustment must be done in the correct order.
(3) The adjustment must be performed in the circumstance of
25±5°C of temperature and 65±10% of relative humidity if
there is no specific designation.
(4) The input AC voltage of the receiver must keep rating
voltage in adjusting.
(5) The receiver must be operated for about 15 minutes prior
to the adjustment.
(6) Signal : The standard color signal is approved in
65±1dBµV.
The standard color signal means digital pattern signal.
3. Focus Adjustment
3-1. Preparation for Adjustment
Receive the Cross-Hatch Pattern(Refer to Fig. 1) and set
Picture mode to “DYNAMIC(CLEAR)”.
3-2. Adjustment
Adjust the upper Focus volume of FBT for the best focus of
screen quarter portion vertical line(red circle).
4. Screen Voltage & Sub-Bright &
White Balance Adjustment
4-1. Adjustment of Screen Manually
(Using ADJ.Remote Control)
(1) Receive the NTSC or PAL signal into RF mode regardless of
channel.
(2) If you press the “ADJ” key in LINE SVC mode(IN-START
KEY), the mode changes to Horizontal Line mode for screen
adjustment.
(3) Adjust the SCREEN at disappear point Horizontal Line using
SCREEN VOL. of FBT (Press the Exit button to exit SVC mode)
4-2. Adjustment of White Balance Manually
NOTE : When adjusting white balance automatically, connect the
adjustment JIG in LINE SVC MODE. (When pressing IN-
START, MUTE key on remote control for adjustment
orderly, it changes to AUTO MODE and Left/Top of
screen displays “AUTO”.)
(1) Receive 100% white pattern.
(2) Adjust LOW Light status(4.5FL) of BLO-R(R CUT), BLO-
G(G CUT) .
(3) Adjust HIGH Light status(35FL) of RG(R-DRIVE), GG(G
DRIVE) at BG(B-DRIVE): 32.
(4) Repeat above step (2) and (3) for the best condition each
status of High Light and Low Light.
X: 267, Y: 276 (Color Temperature: 13000
o
K)
4-3. Adjustment of Sub-Bright
(1) If you press the “ADJ” button on the Remote Control for
adjustment in SCREEN adjustment Mode, mode changes
to Sub-Bright adjustment mode.
(Pressing the Instart-ADJ-ADJ and enter Sub-Bright
adjustment mode)
(Sub-Bright adjustment mode: 14CH, CONTRAST/BRIGHT
Initial data)
(2) Adjust until number “3” almost disappears by using VOL +,
- key.
(3) After finishing adjustment, press the ADJ Key to exit.
ADJUSTMENT INSTRUCTIONS
(Table 1) White Balance Initial Data
LOW
LIGHT
HIGH
LIGHT
BLO-R(R CUT)
BLO-G(G CUT)
RG(R DRIVE)
GG(G DRIVE)
BG(B DRIVE)
32
32
32
32
32 Fix.
0 ~ 63
0 ~ 63
0 ~ 63
0 ~ 63
0 ~ 63
Menu Range Initial Data
US 9CH
(Fig. 1) Cross-Hatch Pattern
A B
Gray Scale
Color Bar
2 3 4 5 6 7 8 9
(Fig. 2) MONO SCOPE

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes. LGE Internal Use Only
- 5 -
5. Deflection Data Adjustment
5-1. Adjustment Preparation
(1) Receive the Digital Pattern.
(2) Using Remote Control for adjustment.
(3) Select the SERVICE 2 in the SERVICE MENU by pressing
LINE SVC MODE(IN-START KEY) and enter deflection
adjustment mode by pressing VOL + Key.
(4) Using the CH +, CH - Key for select the adjustment item.
(5) Using the VOL +, VOL - Key for increase/decrease data.
5-2. Adjustment
(1) First, adjust deflection data at N50Hz(PAL) and adjust at
N60Hz(NTSC), Z60Hz, N50Hz, W50Hz, Z50Hz. (with ARC
Model)
(2) Only adjust N60Hz(NTSC).
(3) After finishing deflection adjustment, press the “ENTER “
key to enter(before pressing the IN-START Key) or exit in
Service mode. (EXIT KEY)
(4) V SLOPE
When you select the V SLOPE adjustment Mode, a half of
the lower screen is Blanking.
At this time, adjust the Blanking Line and geometrical
vertical center-line to be identical.
(5) V SHIFT(VS)
Adjust so that the horizontal center line of a digital circle
pattern is in accord with geometric horizontal center of the
CPT.
(6) V LINEAR(VL)
Adjust until upper and lower screen are symmetrically
equal in Digital Pattern.
(7) V AMPLIT(V AMPITUDE)
NTSC signal: Adjust so that the circle of a digital circle
pattern may be located within the effective
screen of the CPT.
(8) H SHIFT(HS)
Adjust so that the vertical center line of a digital circle
pattern is in accord with geometric vertical center of the
CPT.
(9) EW WIDTH(EW)
Adjust to that a digital circle pattern looks like exact circle.
(10) EW PARAB(EW PARABOLA)
Adjust so that middle portion of the outermost left and right
vertical line looks like parallel with vertical lines of the CPT.
(11) EW TRAPE(EW TRAPEZOID)
Adjust to make the length of top horizontal line same with it
of the bottom horizontal line.
(12) EW UPCOR & EW LOCOR
After finished EP adjustment, adjust vertical line of left-
bottom, right-bottom and left-top, right-top of screen to the
best straight line.
(13) H BOW
After finished EP adjustment, adjust until symmetrize
upper and lower corner of the screen.
(14) H PARALL(ANGLE)
Adjust the vertical slope.
(15) SCORRECT(S CORRECTION)
Adjust so that all distance between each lattice width of
top/center/bottom are to be the same.
[Setting the CPT Default(Initial data) value like that, because
it is decide by CPT DY value
(16) V SCROLL
Adjust so that the geometric vertical center line is in accord
with vertical center line of CPT.
(17) V ZOOM
Setting the CPT Default(Initial data) value like that,
because it is decide by CPT DY value
Adjustment
Point
Actual Screen Size
US 9CH
UPCOR
EW PARAB
LOCOR

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes. LGE Internal Use Only
- 6 -
(Table 2) Deflection Setting Initial Data(SERVICE 2)
V SLOPE
V SHIFT
V LINEAR
V AMPLIT
H-SHIFT
EW WIDTH
EW PARAB
EW TRAPE
EW UPCOR
EW LOCOR
H BOW
H PARALL
SCORRECT
V SCROLL
V ZOOM
WBR
WBF
V SYNSLI
OVRVOLIN
V GUARD
25
43
44
19
39
27
24
21
45
50
34
37
35
25
25
2
2
0
0
0
28
10
41
15
45
30
44
15
50
57
29
34
32
33
25
10
2
0
0
1
21
43
40
22
34
33
55
13
45
55
35
32
35
21
25
7
2
0
0
1
MENU
Vertical slope
Vertical shift
Vertical linearity
Vertical amplitude
Horizontal shift
EW width
Parabola adj
Trapezoid adj
Upper corner adj
Lower corner adj
Bow
Horizontal parallelogram
S correction
Vertical scroll
Vertical zoom
Timing of Wide Blanking
Timing of Wide Blanking
Vertical slicing level
Over voltage input mode
Vertical guard mode
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
adjust if necessary
adjust if necessary
adjust if necessary
adjust if necessary
adjust if necessary
adjust if necessary
adjust if necessary
adjust if necessary
DESCRIPTION 29"
TS Slim 29" FLAT 29" 13R REMARK

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes. LGE Internal Use Only
- 7 -
7. SVC Default Data
(Table 3) SERVICE 1
OVMADAPT
OVMTHR
ADC LEV
DEC LEV
MONO LEV
SAP LEV
FILTBW
MTS LEV
AUX3 VOL
FMWINDOW
BOOSTVAL
MAX VOL
DCXO VAL
DCXOA
BAMA FC
SNDSTEP
SNDRANGE
MONO TH
STEREO TH
GAME ADC
1
1
16
18
18
12
0
16
84
1
0
100
50
0
8
3
255
249
250
1
1
16
18
18
12
0
0
61
0
0
100
50
0
8
0
25
FM pre-scaler(Stereo L/R)
FM pre-scaler(Mono)
Monitor OUT Level
Digital Ctl Xtal Osc.
MENU
OVER MODULATION ADAPT
OVER MODULATION THRESHOLD
ADC LEVEL(-16~15) - ADCLEV
DEC LEVEL(-16~15) - DECLEV
MONO LEVEL(-16~15) - MONOLEV
SAP LEVEL(-16~15) - SAPLEV
FILTER BANDWIDTH
MTS LEVEL(-16~15) - MTSLEV
AUX3 VOL(SCART1 RF SOUND OUT)
FM WINDOW FILTER(FMWS)
BOOSTER
MAX VOLUME
DCXO VALUE
DCXO ALIGNMENT
GAME ADC LEVEL(0~30)
DESCRIPTION REMARK
Middle/South America
Korea
(Table 4) SERVICE 3
AGC
RG
GG
BG
BLO-R
BLO-G
CDL
L-DLY
RGB-BRI
29
32
32
32
32
32
7
13
25
29
32
32
32
32
32
11
13
25
MENU
AGC take over
Red Gain
Green Gain
Blue Gain
Black level offset Red
Black level offset Green
Cathode Drive Level
Luminance delay time
OSD/TEXT BRIGHTNESS
DESCRIPTION 29” S-SLIM
TS Sus Invar AK
29
32
32
32
32
32
7
13
22
29
32
32
32
32
32
8
13
22
29” FLAT 29” Normal
1.3R

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes. LGE Internal Use Only
- 8 -
(Table 5) SERVICE 4
WS
BKS
BSD
DSK
COR
PF
RPO
RPA
PWLDAC
IFOFF
OSD HPOS
CAP HPOS
CHSE
ACL
MENU
WHITE STRETCH
BLACK STRETCH
BLACK STRATCH DEPTH
DYNAMIC SKIN CONTROL
VIDEO DEPENDENT CORING
PEAKING FREQUENCY DELAY
RATION POSITIVE/NEGATIVE PEAKS
RATION PRE/AFTER SHOOT
PEAK WHITE LIMITER DAC
IF DEMODULATIOR
OSD H-POSITION
CAPTION H-POSITION
CHROMA SENSITIVITY
AUTO COLOR LIMITING
DESCRIPTION
1
1
0
0
2
0
3
2
8
37
5
13
0
1
Middle/South America/Korea

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes. LGE Internal Use Only
- 9 -
8. FM TX MODEL(Option)
How to inspect condition of a transmission and reception in FM TRANSMITTER MODEL
(1) FM TRANSMITTER's efficiency inspections is executed to a finished in a final inspection phase.
(2) FM TRANSMITTER is a function which receives voice-singal by an exclusive remote control
and earphone, transmitts a FM through transmitter of inner part in MICOM BOADR to TV sound(MONITOR OUTPUT)
(3) If the received frequency which set up in OSD is being tunned without using an exclusive remote control,
it is available to receive in a general FM receiver.
1) Execute in channel generating voice-signal.
2) Select a transmitted frequency in MENU OSD.
MENU -> SOUND -> TRANSMITTER -> Select frequency(87.7MHZ)
3) A received frequency in an exclusive remote control or received FM Radio is tuned by 87.7MHz
which is same as frequency in OSD.
4) Check out whether a signal generating to MAIN SPEAKER generates in earphone or receiver or not.
5) There is no alternation and setting of adjusted DATA in the process of inspecting FM TX.
OPTION1
OPTION2
OPTION3
OPTION4
0 : 29” Slim, 1: 29” Flat, 2: 29” Normal, 3: 29” TS/AK
0: Other CPT, 1: TS-AK CPT
0: W/O SCR50, 1: W/SCR50
0: 1 TUNER, 1: 2TUNER
0 : W/O Video Mute, 1: W/ Video Mute
0 : W/O SIDE A/V, 1 : W/ SIDE A/V
0 : Standard, 1 : AV Multi System
0: RF stereo, 1:AV stereo, 2: Mono, 3: Mono Dual
0: No PIP, 1: 1 Tuner PIP, 2: 2 Tuner PIP, 3: Reserved
0: EU=>Low curve, 1: NON-EU=>High curve
DVD option
FM TX option
EYE option
4 Key option
TILT option
Degaussing option
CW62C Only 1 =>
Vol. Curve/S Mute timing/component compensation Value change
Refer to the next page. [Table 14]
Refer to the next page. [Table 14]
Not available
0 : Standard, 1 : HOTEL Mode
0 : Deep, 1 : Light
0 : W/O Turbo P/S, 1 : W/ Turbo P/S
CPT
SCREEN
SCR50
TUNER
V-MUTE
AV3
AV MULTI
SOUND
PIP
VOL CURVE (volume curve)
DVD
XWAVE
EYE
4KEY
TILT
DEGAUSS(Degaussing)
CW62C
OSD LANG
LANG INI
REMONCON
HOTEL
COLORTBL
TURBO P/S
MENU FUNCTION
(Table 6) OPTION 1, 2, 3, 4

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes. LGE Internal Use Only
- 10 -
PURITY & CONVERGENCE ADJUSTMENT
Caution:
Convergence and Purity have been factory aligned. Do not
attempt to tamper with these alignments.
However, the effects of adjacent receiver components, or
replacement of picture tube or deflection yoke may require the
need to readjust purity any convergence.
¯Purity Adjustment
This procedure DOES NOT apply to bonded yoke and picture
tube assemblies.
The instrument should be at room temperature (60 degrees F or
above) for six (6) hours and be operating at low beam current
(dark background) for approximately 20 to 30 minutes before
performing purity adjustments.
CAUTION: Do not remove any trim magnets that may be
attached to the bell of the picture tube.
1. Remove the AC power and disconnect the internal
degaussing coil.
2. Remove the yoke from the neck of the picture tube.
3. If the yoke has the tape version beam bender, remove it and
replace it with a adjustable type beam bender (follow the
instructions provided with the new beam bender)
4. Replace the yoke on the picture tube neck, temporarily
remove the three (3) rubber wedges from the bell of the
picture tube and then slide the yoke completely forward.
5. Reconnect the internal degaussing coil.
6. Position the beam bender locking rings at the 9 o'clock
position and the other three pairs of tabs (2,4 and 6 pole
magnets) at the 12 o'clock position.
7. Perform the following steps, in the order given, to prepare the
receiver for the purity adjustment procedure.
a. Face the receiver in the "magnetic north" direction.
b. Externally degauss the receiver screen with the television
power turned off.
c. Turn the television on for approximately 10 seconds to
perform internal degaussing and then turn the TV off.
d. Unplug the internal degaussing coil. This allows the
thermistor to cool down while you are performing the purity
adjustment. DO NOT MOVE THE RECEIVER FROM ITS
"MAGNETIC NORTH" POSITION.
e. Turn the receiver on and obtain a red raster by increasing
the red bias control (CW) and decreasing the bias controls
for the remaining two colors (CCW).
f. Attach two round magnets on the picture tube screen at 3
o'clock and 9 o'clock positions, approximately one (1) inch
from the edge of the mask (use double-sided tape).
DEFLECTION YOKE
PURITY &CONVERGENCE
MAGNET ASSEMBLY
RUBBER
WEDGES
GLASS CLOTH TAPE
,,,,
,,,,
,,,,,
,,,,
,,,,
,,
,,
,,,
,,,
,,
,,,,,
,,,,,
,,,,,
,,,,,,
,,,,,
,,,,,
,,,,,
,,,,,
,,
PURITY MAGNET
6-POLE
4-POLE
4-POLE
MAGNET
CONVERGENCE MAGNET ASSEMBLY
6-POLE
MAGNES PURITY MAGNET(2-POLE)
X-AXIS YOKE
POSITIONING
(L/R PURITY)
6-POLE
MAGNETS
CONVERGENCE MAGNET ASSEMBLY

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes. LGE Internal Use Only
- 11 -
8. Referring to above, perform the following two steps:
a. Adjust the yoke Z-axis to obtain equal blue circles.
b. Adjust the appropriate beam bender tabs to obtain correct
purity (four equal circles).
9. After correct purity is set, tighten the yoke clamp screw and
remove the two screen magnets.
10. Remove the AC power and rotate the receiver 180 degrees
(facing "magnetic south").
11. Reconnect the internal degaussing coil.
12. Turn the receiver on for 10 seconds (make sure the receiver
came on) to perform internal degaussing, and then turn the
receiver off.
13. Unplug the internal degaussing coil.
14. Turn on the receiver and check the purity by holding one (1)
round magnet at the 3 o'clock and a second round magnet at
9 o'clock position. If purity is not satisfactory, repeat steps 8
through 14.
15. Turn off the receiver and reconnect the internal degaussing
coil.
¯Convergence Adjustment
Caution: This procedure DOES NOT apply to bonded yoke and
picture tube assemblies.
Do not use screen magnets during this adjustment
procedure. Use of screen magnets will cause an
incorrect display.
1. Remove AC power and disconnect the internal degaussing
coil.
2. Apply AC Power and set the brightness to the Picture Reset
condition. Set the Color control to minimum.
3. Make horizontal line.
4. Adjust the Red, Green and Blue Bias controls to get a dim
white line.
5. Restore the screen by removing the horizontal line.
6. Reconnect the internal degaussing coil and apply AC power.
7. Turn the receiver on for 10 seconds to perform internal
degaussing and then turn the receiver off again.
8. Unplug the internal degaussing-coil.
9. Turn on the receiver, connect a signal generator to the VHF
antenna terminal and apply a crosshatch signal.
Caution: During the convergence adjustment procedure, be
very careful not to disturb the purity adjustment tabs
are accidentally move, purity should be confirmed
before proceeding with the convergence adjustments.
Note: Make sure the focus is set correctly on this instrument
before proceeding with the following adjustment.
10. Converge the red and blue vertical lines to the green vertical
line at the center of the screen by performing the following
steps (below TABLE).
a. Carefully rotate both tabs of the 4-pole ring magnet
simultaneously in opposite directions from the 12 o'clock
position to converge the red and blue vertical lines.
b. Carefully rotate both tabs of the 6-pole ring magnet
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.
11. Converge the red and blue horizontal with the green line at
the center of the screen by performing the following steps.
(below TABLE)
a. Carefully rotate both tabs of the 4-pole ring magnet
simultaneously in the same direction (keep the spacing
between the two tabs the same) to converge the red and
blue horizontal lines.
b. Carefully rotate both tabs of the 6-pole ring magnet
simultaneously in same direction (keep the spacing
between the two tabs the same) to converge the red and
blue (now purple) horizontal lines with the green
horizontal line.
c. Secure the tabs previsouly adjusted by locking them in
place with the locking tabs on the beam bender.
MAGNETS
RED RED
1.ADJUST YOKE Z-AXIS FIRST
TO GET EQUAL BLUE
COLOR CIRCLES
2 .ADJUST BEAM BENDER 2 POLE
MAGNET TO GET FOUR EQUAL
COLOR CIRCLES

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes. LGE Internal Use Only
- 12 -
RING
PAIRS
4
POLE
ROTATION DIRECTION
OF BOTH TABS
OPPOSITE
SAME
OPPOSITE
SAME
MOVEMENT OF RED
AND BLUE BEAMS
B B
RR OR
OR
B R B R
OR
B
R
B
R
B R OR BR
6
POLE
12. While watching the 6 o'clock positions on the screen, rock the
front of the yoke in a vertical (up/down) direction to converge
the red and blue vertical lines. (Fig upper left)
13. Temporarily place a rubber wedge at the 12 o'clock position
to hold the vertical position or the yoke.
14.
Check the 3 o'clock and 9 o'clock areas to confirm that the red
and blue horizontal lines are converged.
If the lines are not converged, slightly offset the vertical tilt of the
yoke (move the rubber wedge if necessary) to equally balance the
convergence error of the horizontal lines at 3 o'clock and 9 o'clock
and the vertical lines at 6 o'clock and 12 o'clock.
15. Place a 1.5 inch piece of glass tape over the rubber foot at
the rear of the 12 o'clock wedge.
16. While watching the 6 o'clock and 12 o'clock areas of the
screen, rock the front of the yoke in the horizontal (left to
right) motion to converge the red and blue horizontal lines.
(Fig. upper right)
17. Temporarily place a rubber wedge at the 5 o'clock and 7
o'clock positions to hold the horizontal position of the yoke.
18. Check the 3 o'clock and 9 o'clock areas to confirm that the
red and blue vertical lines are converged. If the lines are not
converged, slightly offset the horizontal tilt of the yoke (move
the temporary rubber wedges if necessary) to equally
balance the convergence error of the horizontal lines at 6
o'clock and 12 o'clock and the vertical lines at 3 o'clock and 9
o'clock.
19. Using a round magnet confirm purity at the center, right and
left sides and corners. See Purity Adjustment Procedure.
20. Reconfirm convergence and apply a 1.5 inch piece of glass
tape over the rubber foot at the rear of the 5 o'clock and the 7
o'clock wedges.
RED
BLUE
RED BLUE
BLUE
RED
GREEN
GREEN
BLUE RED
GREEN
GREEN
ADJUSTMENT
VIEWING
AREA
UP/DOWN ROCKING OF THE YOKE
CAUSES OPPOSITE ROTATION OF RED
AND BLUE RASTERS
ADJUSTMENT
VIEWING
AREA RED
RED
GREEN
TV
SCREEN
LEET/RIGHT ROCKING OF THE YOKE
CAUSES OPPOSITE SIZE CHANGE OF
THE RED AND BLUE RASTERS
UP/DOWN ROCKING OF THE YOKE
CAUSES OPPOSITE ROTATION OF RED
AND BLUE RASTERS
LEFT/RIGHT ROCKING OF THE YOKE
CAUSES OPPOSITE SIZE CHANGE OF THE
RED AND BLUE RASTERS

SVC REMOCON
- 13 -
Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes. LGE Internal Use Only

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes. LGE Internal Use Only
- 14 -
TROUBLE SHOOTING
Check the waveform
at pin 2, 4 of IC601
Check the voltage
at pin 5, 7 of IC601
Check the waveform
at pin 8, 9, 11, 12
of IC601
Check
IC901, P403A
Check
FR901, P403A,
P902B
, FR401

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes. LGE Internal Use Only
- 15 -

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes. LGE Internal Use Only
- 16 -
P20A
(R, G, B out of IC501)
check IC501 pin 83,84,85
(R,G,B out)
check IC501 pin 83,
84,85 (R,G,B out)
P20A
(R, G, B out of IC501)

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes. LGE Internal Use Only
- 17 -
NP
2 4
8 9 11 25 7
Does the auto-Program
operate properly

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes. LGE Internal Use Only
- 18 -
BLOCK DIAGRAM

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes. LGE Internal Use Only
- 19 -
MEMO

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes. LGE Internal Use Only
- 20 -
EXPLODED VIEW
300
120
540
311
310
530
330
590
320
504
174
112
150
170
913
400
943
520
Many electrical and mechanical parts in this chassis have special safety-related characteristics.These
parts are identified by in the Schematic Diagram and EXPLODED VIEW.
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.
IMPORTANT SAFETY NOTICE