Read Panasonic TX-29FG20T Service Manual online
Power Source
AC Auto 160-240 V, 50/60 Hz
Power Consumption
127 W
Standby condition : 2 W
Aerial Terminal
Impedance : 75
Ω
, Coaxial type
Tuning System
Frequency Synthesizer
Auto Search Tuning
Pos : 100 Positions
Receiving System
17 Systems
Receiving Channels
Regular TV
2-12 (PAL/SECAM B, K1)
0-12 (PAL B AUST.)
1-9 (PAL B N.Z.)
1-12 (PAL/SECAM D)
1-12 (NTSC M Japan)
2-13 (NTSC M U.S.A)
21-69 (PAL G, H, I/SECAM G, K, K1)
28-69 (PAL B AUST.)
13-57 (PAL D, K)
13-62 (NTSC M Japan)
14-69 (NTSC M U.S.A.)
CATV
S1-S20 (OSCAR)
1-125 (U.S.A. CATV)
C13-C49 (JAPAN)
S21-S41 (HYPER)
Z1-Z37 (CHINA)
5A, 9A (AUST)
Intermediate Frequency
38.0 MHz
TX-29FG20T
GP4 Chassis
Video
31.5 MHz (D, K) / 32.5 MHz (B, G)
32.0 MHz (I) / 32.5 MHz (M)
Sound
33.57 MHz (PAL) /
Colour
33.6 MHz (SECAM)
34.42 MHz (NTSC) /
33.75 MHz (SECAM)
Receiving Stereo Sound System
AV STEREO
Video/Audio/Terminals
AV 1, 2,
Y / P
B
/ P
R
(Phone Type) Y:1.0Vp-p 75
Ω
PB,
PR:0.7Vp-p 75
Ω
Video 1.0Vp-p
75
Ω
Audio Approx. 400mV 47K
Ω
Video 1.0Vp-p 75
Ω
Monitor Out
Audio Approx. 400mV 47K
Ω
High Voltage
31.0 (±1) at zero
beam current
Picture Tube
A68LZU185X Type 29 (68 cm)
Measured diagony,
104° deflection
Audio Output
16 W speaker
Dimensions (W x D x H)
786 mm x 508 mm x 578 mm
Weight (Mass)
43 kg (Net)
Note:
Specifications are subject to change without notice. Mass and
dimensions shown are approximate.
dimensions shown are approximate.
Colour Television
Specification
Order No. MTV0501387C3
1 Safety Precautions
3
1.1.
General Guide
3
1.2.
Leakage Current Cold Check
3
1.3.
Leakage Current Hot Check (See Fig. 1)
3
1.4.
X-Radiation
3
1.5.
GP4 Block Diagram
4
2 Service Hints
5
2.1.
HOW TO MOVE CHASSIS INTO SERVICE POSITION. 5
3 Market Mode Function
6
3.1.
Service Mode Access
6
3.2.
Service Mode 1 Controls
6
3.3.
Service Mode 1 Function
6
3.4.
Service Mode 2 Controls (OPTION data 1 ~ 3)
6
4 Adjustment Procedure
7
4.1.
Adjustment Procedure
7
4.2.
COLOUR PURITY
7
4.3.
CONVERGENCE
8
4.4.
WHITE BALANCE (MARKET MODE CHK 4)
9
4.5.
ADJUSTMENT OF CRT VRS
10
5 Conductor Views
11
5.1.
D Board 1/2
11
5.2.
D Board 2/2
12
6 Schematic Diagrams
13
6.1.
SCHEMATIC DIAGRAM FOR GP4 CHASSIS
13
6.2.
D Board
15
6.3.
L Board
20
6.4.
G Board
23
7 Parts Locations
26
8 Replacement Parts List
27
8.1.
Replacement Parts List Notes
27
8.2.
Replacement Parts List
28
CONTENTS
Page
Page
2
TX-29FG20T
1 Safety Precautions
1.1. General Guide
1. It is advisable to insert an isolation transformer in the AC
supply before servicing a hot chassis. Fig. 1.
Fig. 1
2. When servicing, observe the original lead dress, especially
the lead dress in the high voltage circuits. If a short circuit is
found, replace all parts which have been overheated or
damaged by the short circuit.
found, replace all parts which have been overheated or
damaged by the short circuit.
3. After servicing, observe that all the protective devices such
as insulation barriers, insulation papers, shields, and
isolation R-C combinations, are properly installed.
isolation R-C combinations, are properly installed.
4. When the receiver is not to be used for a long period of
time, unplug the power cord from the AC outlet.
5. Potential, as high as 32kV kV is present when this receiver
is in operation. Operation of the receiver without the
receiver power supply. Servicing should not be attempted
by anyone who is not thoroughly familiar with the
precautions necessary when working on high voltage
equipment. Always discharge the anode of the picture tube
to the receiver chassis before handling the tube.
After servicing make the following leakage current checks to
prevent the customer from being exposed to shock
hazards.
receiver power supply. Servicing should not be attempted
by anyone who is not thoroughly familiar with the
precautions necessary when working on high voltage
equipment. Always discharge the anode of the picture tube
to the receiver chassis before handling the tube.
After servicing make the following leakage current checks to
prevent the customer from being exposed to shock
hazards.
1.2. Leakage Current Cold Check
1. Unplug the AC cord and connect a jumper between the two
prongs on the plug. Fig. 2.
Fig. 2
2. Turn on the receiver’s power switch.
3. Measure the resistance value, with an ohmmeter, between
3. Measure the resistance value, with an ohmmeter, between
the jumpered AC plug and each exposed metallic cabinet
part on the receiver, such as screw heads, aerials,
connectors, control shafts, etc. When the exposed metallic
part has a return path to the chassis, the reading should be
between 4 M
part on the receiver, such as screw heads, aerials,
connectors, control shafts, etc. When the exposed metallic
part has a return path to the chassis, the reading should be
between 4 M
Ω
Ω
Ω
Ω
and 20 M
Ω
Ω
Ω
Ω
. When the exposed metal does
not have a return path to the chassis, the reading must be
zero.
zero.
1.3. Leakage Current Hot Check
(See Fig. 1)
1. Plug the AC cord directly into the AC outlet. Do not use an
isolation transformer for this check.
2. Connect a 2 k
Ω
, 10 W resistor in series with an exposed
metallic part on the receiver and an earth such as a water
pipe.
pipe.
3. Use an AC voltmeter, with high impedance type, to
measure the potential across the resistor.
4. Check each exposed metallic part, and measure the
voltage at each point. Fig. 3.
Fig. 3
5. Reverse the AC plug in the AC outlet and repeat each of the
above measurements.
6. The potential any point should not exceed 1.0 V rms. In the
case of a measurement being outside of the limits specified,
there is a possibility of a shock hazard, and the receiver
should be repaired and re-checked before it is returned to
the customer. Fig. 4.
there is a possibility of a shock hazard, and the receiver
should be repaired and re-checked before it is returned to
the customer. Fig. 4.
Fig. 4
1.4. X-Radiation
Warning :
1. The potential sources of X-Radiation in TV sets are the EHT
1. The potential sources of X-Radiation in TV sets are the EHT
section and the picture tube.
2. When using a picture tube test rig for service, ensure that
the rig is capable of handling 30 kV without causing X-
Radiation.
Radiation.
Note: It is important to use an accurate periodically calibrated
high voltage meter.
1. Set the brightness to minimum.
2. Measure the High Voltage. The meter reading should
high voltage meter.
1. Set the brightness to minimum.
2. Measure the High Voltage. The meter reading should
indicate 31.0 ± 1.0kV. If the meter indication is out of
tolerance, immediate service and correction is required to
prevent the possibility of premature component failure.
tolerance, immediate service and correction is required to
prevent the possibility of premature component failure.
3. To prevent the possibility of X-Radiation, it is essential to
use the specified picture tube.
3
TX-29FG20T
1.5.
GP4
Block
Diagram
I
INPUT
ID1
ID2
AV
1
YUV
AV
2
AV
–
3
3
1
4
4
S-VHS
TUNER
VM
R
G
B
G
B
GP4
coil
defl.
VIDEO
SWITCH
IC604
IF
MONITOR
OUT
IC801
T801
IC857
3.3V
IC855
3.3V & 1.8V
EEPROM
IC1101
AUDIO
AMP
IC2301
GEOMAGNETIC
V OUT
IC601
VCT-IF
SAW
AV1
AV2
AV3
AV2
AV3
AV4
AUDIO
SWITCH
IC2320/1
Y
U
V
U
V
AV1 Y/C
Y/C
YUV3
YUV4
Y
U
V
U
V
IF
H OUT
WOOFER
AMP
IC2302
SPEAKER
V
H
R
G
B
G
B
VM
SDA SCL
PRIMARY
LIFE CCT
WOOFER
EW
EW
AV1
AV2
AV2
WOOFER
IC851
5V & 8V
+B 140V
SOUND 15V
Antenna
CRT
L
R
R
4
TX-
29FG2
29FG2
0T