Read Panasonic TX-29G450T Service Manual online
Power Source :
AC SINGLE 220-240V, 50/60Hz
Power Consumption :
110W
Aerial Impedance :
75
Ω
unbalanced
Coaxial type
Receiving System :
17 Systems
Receiving Channels :
VHF
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)
UHF
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 - C41
(HYPER)
Z1 - Z37
(CHINA)
5A, 9A
(AUST.)
Intermediate Frequency :
TX-29G450T
GP21 Chassis
Video
38.0 MHz
Sound
31.5 MHz (D, K, K1)
32 MHz (I)
32.5 MHz (B, G)
33.5 MHz (M)
Colour
33.57 MHz (PAL)
33.6 MHz (SECAM)
33.75 MHz (SECAM)
34.42 MHz (NTSC)
Video / Terminals :
AV 1, 2
Y:1 Vp-p, 75
Ω
S-Video In
C:0.3 Vp-p, 75
Ω
DVD
Y
1.0 Vp-p, 75
Ω
PB
0.7 Vp-p, 75
Ω
YR
0.7 Vp-p, 75
Ω
AV 1, 2, 3, 4
Video In
1 Vp-p, 75
Ω
Audio In
Approx. 0.5V, 47k
Ω
Monitor Out
Video Out 1 Vp-p, 75
Ω
Audio Out Approx. 0.5V, 1k
Ω
High Voltage :
31.0kV±1.0V
at zero beam current
Picture Tube :
A68LZU185X-42
67.6cm (29 inches)
Measured diagony,
Colour Television
Specifications
ORDER NO. MTV0701504CE
90° deflection
Audio Output :
10W+10W = 20W
Dimensions :
Height : 576 mm
Width : 762 mm
Depth : 493 mm
1
Safety Precautions
3
1.1.
General Guide Lines
3
1.2.
Leakage Current Cold Check
3
1.3.
Leakage Current Hot Check (Fig. 1)
3
1.4.
X-Radiation
3
1.5.
GP21 Chassis Block Diagram
4
2
Service Hints
5
2.1.
Service Position for E-Board
5
2.2.
Factory Mode Adjustment
5
2.3.
Adjustment for White Balance
6
2.4.
Adjustment for CRT CUT OFF
6
2.5.
Adjustment Procedure
7
Mass :
42 kg (Net Wt.)
Specifications are subject to change without notice.
Mass and dimensions shown are approximate.
Mass and dimensions shown are approximate.
2.6.
PAL Colour
8
2.7.
Adjustment
8
3
Conductor Views
12
4
Schematic Diagram
13
4.1.
D Board
15
4.2.
A Board
20
4.3.
L Board
25
4.4.
G Board
29
5
Parts Locations
32
6
Replacement Parts List
33
6.1.
Replacement Parts List
34
CONTENTS
Page
Page
2
TX-29G450T
1 Safety Precautions
1.1. General Guide Lines
1. It is advisable to insert an isolation transformer in the AC supply before servicing this hot chassis.
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.
3. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers, shields and 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 cord outlet.
5. Potential, as high as 32.0kV is present when this receiver is in operation. Operation of the receiver without the rear cover
involves the danger of a shock hazard from 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.
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.
2. Turn on the receiver’s power switch.
Measure the resistance value, with an ohmmeter, between the jumper 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
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
and 20 M
Ω
. When the exposed metal does not have a return path to the chassis,
the reading must be infinite.
1.3. Leakage Current Hot Check (Fig. 1)
1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.
2. Check a 2 k
Ω
non-inductive resistor and an AC/DC current meter, in series with each exposed metallic part on the receiver in
turn and an earth such as a water pipe.
The current from any point should not exceed 0.7 mA peak AC or 2 mA DC. In the case of a measurement being outside of
these limits specified, there is a possibility of a shock hazard and the receiver should be repaired and rechecked before it is
returned to the customer.
these limits specified, there is a possibility of a shock hazard and the receiver should be repaired and rechecked before it is
returned to the customer.
Fig. 1
,
1.4. X-Radiation
Warning:
The potential sources of X-Radiation in TV set are the EHT section and the picture tube. When using a picture tube test jig for
service, ensure that jig is capable of handling 32.0kV without causing X-Radiation.
service, ensure that jig is capable of handling 32.0kV without causing X-Radiation.
Note: It is important to use an accurate periodically calibrated high voltage meter.
1. Set the brightness to minimum.
2. Use the remocon to get into Service Mode.
3. Measure the EHT. 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.
4. To prevent the possibility X-Radiation, it is essential to use the specified picture tube, if service replacement becomes
necessary.
3
TX-29G450T
1.5. GP21 Chassis Block Diagram
SDA
SCL
RGB
In
CVBS Out
Video In
MON Out
CVBS
In
VCTP
Audio
Amp.
Audio
Amp.
VCTP
PVP
DDP
CRT
Board
defl.coil
CRT
T
uner
GP21 BLOCK DIAGRAM
AV
Audio
In
15V
(Audio Amp)
15V
10.5V
6.5V
137V
10.5V
(H-Drive Circuit)
9V
3.3V
standby
1.8V
standby
6.5V
(G-Board)
5V
13.3V
137V
Switching
Transformer
Primary
Live
Circuit
MON
Audio
Out
Audio
Out
Audio Amp
(Woofer)
left speaker
right speaker
woofer
option line
Indication
option device
RGB Out
reg
reg
reg
reg
Q865
RGB Out
Vert
H Out
H-Output
EEPROM
RGB Out
CVBS In
Vertical
Output
RGB In
4
TX-29G450T
