LG RT-29FC90RB User manual

COLOR TV
SERVICE MANUAL
CHASSIS : MC-035B
MODEL:RT-29FC90RB/RP
website:http://biz.LGservice.com
e-mail:http://www.LGEservice.com/techsup.html
PR
VOL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
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CONTENTS
CONTENTS .............................................................................................. 2
SAFETY PRECAUTIONS ..........................................................................3
SPECIFICATIONS .................................................................................... 4
CONTROL DESCRIPTIONS .................................................................... 5
ADJUSTMENT INSTRUCTIONS ............................................................. 8
TROUBLE SHOOTING .......................................................................... 15
PRINTED CIRCUIT BOARD ....................................................................20
BLOCK DIAGRAM ................................................................................. 27
EXPLODED VIEW .................................................................................. 30
EXPLODED VIEW PARTS LIST ..............................................................31
REPLACEMENT PARTS LIST ............................................................... 32
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.
OGeneral Specification
OPower requirement : AC110-240V, 50/60Hz(RT model)
AC230V,50Hz (RZ model)
OPower consumption : Max 165W
OCPT : Flat CPT
OFeature and Function
No.
1
2
3
4
5
6
Item
Receiving Broadcasting
Method
AV Receiving System
Receiving Channel
Input Voltage
Screen Size
Tuning System
Specification
PAL/SECAM-B/G, D/K
PAL I/I,SECAM L/LÕ(option)
NTSC M(option)
NTSC M/PB,PAL BG,DK,I
SECAM BG, DK
VHF: E2~E12
UHF: E21~E69
CATV: S1~S20
HYPER: S21~S41
L/LÕ: B,C,D(option)
AC 110-240V/50Hz,60Hz(NON-EU)
AC 230V/50Hz(EU)
FLAT 29Ó , WIDE 32Ó/28Ó
FVS 100 program/200PR.(w/o txt)
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Item
Teletext
REMOCON
AV input
Component input
PERI TV connector
RGB input
2 Carrier Stereo
NICAM Stereo
2 Carrier Dual
NICAM Dual
SSC(Split Screen) Mode
Multi Picture Display Mode
Film Mode
Noise Reduction
Progressive Scan
Motion Detection
Swivel Speaker
Digital Eye
Specification
TOP,FLOF 2000 page(option)
LG code
4(Side or Front:1 Rear:3)
2(Rear:option)
Full SCART:1 (AV1:option)
1(AV1:option)
BG,DK
BG,I,L(RZ model option)
BG,DK
BG,I,L(RZ model option)
O
O
O
O
O
O
O(option-29FB90)
O
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Min
0.85
3.0
40
0.4
0.1
43
2
0.85
3.8
40
0.4
0.1
43
0.6
0.6
Typ
1
0.5
1
0.5
0.7
0.7
Max
1.15
0.6
7
2
1.15
0.6
7
2
0.8
0.8
Unit
Vpp
MHz
dB
V
kHz
dB
%
V
Vpp
MHz
dB
V
kHz
dB
%
Vpp
Vpp
Remark
0.85
3.0
40
0.4
0.1
43
2
0.85
3.8
40
0.4
0.1
43
0.6
0.6
Item
Video input level
Video input frequency response
Video input S/N
Audio input level
Audio input frequency response
Audio input S/N
Audio input distortion
Audio input dynamic range
Video output level
Video output frequency response
Video output S/N
Audio output level
Audio output frequency response
Audio output S/N
Audio output distortion
Video input level, R/G/B
Video input level,
Component(Y,PB,PR)
OExternal Interface Regulation
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CONTROL DESCRIPTIONS
All the functions can be controlled with the Communicator.
Some functions can also be adjusted with the buttons on the front panel of the set.
Communicator.
Before you use the Communicator, please install the batteries. See the next page.
1.SSM( Sound Status Memory)
recalls your preferred sound setting.
2. PSM(Picture Status Memory)
recalls your preferred picture setting.
3.ARC(Aspect ratio Control)
changes the picture format.
4.VCR BUTTONS
control a LG video cassette recorder.
5.DVD BUTTONS.
control a LG DVD.
6.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.
SCAN
switches on or off the programme scan mode through 12 sub pictures.
7.RESET
initalize the adjusted value.
8.POWER
switches the set on from standby or off to standby.
9.NUMBER BUTTONS
switches the set on from standby or directly select a number.
10.MENU
selects a menu.
11.(Programme Up/Down)
selects a programme or a menu item.
switches the set on from standby.
(Volume Down/Up)
adjusts the volume.
adjusts menu settings
OK
accepts your selection or display the current mode
12.MUTE
switches the sound on or off
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