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ORDER No. 03-SM-014
Service Manual
Colour Television
TX-29PX20D
TX-29PX20F
TX-29PX20P
EURO- 9S Chassis
SPECIFICATIONS
Power Source: 220-240V a.c., 50Hz AV2 IN Video (21 pin) 1V p-p 75
Audio (21 pin) 500mV rms 10k
Power Consumption: 107W S-Video IN Y: 1V p-p 75
(21-pin) C:0,3V p-p 75
Stand-by Power
Consumption: 0,6W AV2 OUT Video (21 pin) 1V p-p 75
Audio (21 pin) 500mV rms 1k
Aerial Impedance: 75 unbalanced, Coaxial Type
AV3 IN S-Video IN Y: 1V p-p 75
Receiving System: PAL-I, B/G, D/K, PAL-525/60 (4-pin) C:0,3V p-p 75
SECAM B/G, D/K, L/L' Audio (RCAx2) 500mV rms 10k
M.NTSC (AV only) Video (RCAx1) 1V p-p 75
NTSC (AV only)
AV4 IN Video (21 pin) 1V p-p 75
Receiving Channels: Audio (21 pin) 500mV rms 10k
VHF E2-E12 VHF H1-H2 (ITALY) RGB (21 pin) 0,7V p-p 75
VHF A-H (ITALY) VHF R1-R2 S-Video IN Y: 1V p-p 75
VHF R3-R5 VHF R6-R12 (21-pin) C:0,3V p-p 75
UHF E21-E69 CATV (S01-S05)
CATV S1-S10 (M1-M10) CATV S11-S20 (U1-U10) AV4 OUT Video (21 pin) 1V p-p 75
CATV S21-S41 (HYPERBAND) Audio (21 pin) 500mV rms 1k
Intermediate Frequency: AV4C IN Video (RCAx3) Y:1V p-p 75
Video/Audio Pb, Pr: 0,7V p-p 75
Video 38,9MHz, 33,9MHz
Sound 33,4MHz (B/G), 33,16MHz (A2) High Voltage: 30,5kV ± 1kV
33,05MHz (NICAM B/G,D/K,L)
32,4MHz (D/K),32,66MHz (CZ STEREO) Picture Tube: A68ELO50X71 68cm
40,4MHz (L'), 39,75MHz (L'NICAM)
Colour 34,47MHz (PAL) Audio Output: 2x10W RMS, 2x20W MPO,
34,5MHz, 34,65MHz (SECAM) 8 impedance
38,3MHz, 38,15MHz (SECAM L')
Headphones: 8 Impedance
Terminals:
AUDIO MONITOR OUT Audio (RCAx2) 500mV rms 1k Accessories
supplied : Remote Control
AV1 IN Video (21 pin) 1V p-p 75 2 x R6 (UM3) Batteries
Audio (21 pin) 500mV rms 10k
RGB (21 pin) 0,7V p-p 75 Dimensions:
Height: 586mm
AV1 OUT Video (21 pin) 1V p-p 75 Width: 781mm
Audio (21 pin) 500mV rms 1k Depth: 531mm
Net weight: 49,5kg
Specifications are subject to change without notice.
Weights and dimensions shown are approximate.
CONTENTS
SAFETY PRECAUTIONS ......................................................................................................................................................... 2
SERVICE HINTS ...................................................................................................................................................................... 3
ADJUSTMENT PROCEDURE AND SELF-CHECK .................................................................................................................. 4
WAVEFORM PATTERN TABLE............................................................................................................................................... 5
ALIGNMENT SETTINGS .......................................................................................................................................................... 6
BLOCK DIAGRAMS.................................................................................................................................................................. 7
PARTS LOCATION................................................................................................................................................................. 12
REPLACEMENT PARTS LIST................................................................................................................................................ 13
SCHEMATIC DIAGRAMS....................................................................................................................................................... 26
CONDUCTOR VIEWS ............................................................................................................................................................ 30
SAFETY PRECAUTION
GENERAL GUIDE LINES
1. It is advisable to insert an isolation transformer in the 4. Check each exposed metallic part and check the
a.c. supply before servicing a hot chassis. voltage at each point.
2. When servicing, observe the original lead dress in the 5. Reverse the a.c. plug at the outlet and repeat each of
high voltage circuits. If a short circuit is found, replace the previous measurements.
all parts that have been overheated or damaged by 6. The potential at any point should not exceed
the short circuit. 1,4 Vrms. In case a measurement is outside the limits
3. After servicing, see that all the protective devices specified, there is a possibility of a shock hazard, and
such as insulation barriers, insulation papers, shields the receiver should be repaired and rechecked before
and isolation R-C combinations are correctly it is returned to the customer.
installed.
4. When the receiver is not being used for a long period
of time, unplug the power cord from the a.c. outlet. HOT CHECK CIRCUIT
5. Potentials as high as 31,5kV are present when this
receiver is in operation. Operation of the receiver a.c. VOLTMETER
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
familiar with the precautions necessary when working
on high voltage equipment. Always discharge the
anode of the tube.
6. After servicing make the following leakage current WATER PIPE
2k 10 Watts
checks to prevent the customer from being exposed (EARTH)
to shock hazard.
LEAKAGE CURRENT COLD CHECK TO INSTRUMENT'S EXPOSED
METALLIC PARTS
1. Unplug the a.c. cord and connect a jumper between Fig. 1.
the two prongs of the plug.
2. Turn on the receiver's power switch.
3. Measure the resistance value with an ohmmeter, X-RADIATION WARNING
between the jumpered a.c. plug and each exposed 1. The potential sources of X-Radiation in TV sets are
metallic cabinet part on the receiver, such as screw the high voltage section and the picture tube.
heads, aerials, connectors, control shafts etc. When 2. When using a picture tube test jig for service, ensure
the exposed metallic part has a return path to the that the jig is capable of handling 31,5kV without
chassis, the reading should be between 4M ohm and causing X-Radiation.
20M ohm. When the exposed metal does not have a
return path to the chassis, the reading must be NOTE: It is important to use an accurate periodically
infinite. calibrated high voltage meter.
LEAKAGE CURRENT HOT CHECK 1. Set the brightness to minimum.
1. Plug the a.c. cord directly into the a.c. outlet. Do not 2. Measure the high voltage. The meter should indicate:
use an isolation transformer for this check. 30,5kV ± 1kV.
2. Connect a 2k 10W resistor in series with an If the meter indication is out of tolerance, immediate
exposed metallic part on the receiver and an earth, service and correction is required to prevent the
such as a water pipe. possibility of premature component failure.
3. Use an a.c. voltmeter with high impedance to 3. To prevent any X-Radiation possibility, it is essential
measure the potential across the resistor. to use the specified tube.
2
SERVICE HINTS
How to remove the rear cover
1. Remove the 9 screws as shown in Fig.2.
SCREWS SCREWS
Fig. 2
LOCATION OF CONTROLS
H-Board A-Board L-Board Focus Screen D-Board G-Board
Fig. 3
3
ADJUSTMENT PROCEDURE
Item / Preparation Adjustments
+B SET-UP Confirm the following voltages:
1. Receive a Window pattern.
2. Set the controls : TPD1 205 ± 10V TPD11 5 ± 0,5V
TPD2 137 ± 2V TPD12 3,3 ± 0,1V
Brightness Minimum TPD3 42 ± 2V TPD13 2,5 ± 0,1V
TPD5 42 ± 2V TPD14 3,3 ± 0,1V
Contrast Minimum TPD6 12,5 ± 1V TPD15 5 ± 0,5V
TPD7 -12,5 ± 1V TPD16 5 ± 0,5V
Volume Minimum TPD8 30,5 ± 1V TPG3 7,5 ± 0,5V
TPD9 9 ± 1V TPG5 300 ± 10V
TPD10 8 ± 0,5V
CUT OFF / Ug2 Test To adjust Cutoff connect an oscilloscope to the Blue cathode. Adjust
1. Receive a Window pattern. the screen VR until the black level is 170V +0V/-5V.
2. Normalize the TV set.
3. Set brightness: minimum. Black Level
170V+0V/-5V
GND
SELF CHECK
Self-check is used to automatically check the bus lines and hexadecimal code of the TV set.To enter Self-Check mode, press
the STATUS button on the remote control and at the same time press the down (-/v) button on the customer controls at
the front the TV set. To exit Self Check, switch off the TV set at the power button.
E2 O.K. SUM ****
DDP O.K.
VSP O.K.
AVSW O.K.
TUN O.K.
MSP O.K.
DPL ---
MAS ---
TX-29PX20D TX-29PX20F
TX-29PX20P
OPTION 1 0F 0F
OPTION 2 00 00
OPTION 3 A9 A9
OPTION 4 11 11
OPTION 5 00 00
OPTION 6 25 25
OPTION 7 7F 7F
OPTION 8 D0 50
OPTION 9 00 00
OPTION 10 80 80
OPTION 11 09 09
OPTION 12 00 00
OPTION 13 08 08
CHECK CE 4E
If the CCU ports have been checked and found to be incorrect or not located then " - - " will appear in place of "O.K.".
4
WAVEFORM PATTERN TABLE
CONDITIONS: CONTRAST...MAX, BRIGHTNESS...MID, COLOUR...MID, SHARPNESS...MID
5
ALIGNMENT SETTINGS
(The figures below are nominal and used for representative purposes only.)
1. Set the Bass to maximum position, set the Treble to minimum position, set the Volume to minimum then press the
down button (-/v) on the customer controls at the front of the TV and at the same time press the INDEX button on the
remote control, this will place the TV into the Service Mode 1.
2. Press the RED / GREEN buttons to step up / down through the functions.
3. Press the YELLOW / BLUE buttons to alter the function values.
4. Press the STR button after each adjustment has been made to store the required values.
5. To exit the Service Mode, press the "N" button.
Setting indication
Alignment Function Settings / Special features
Note: All setting values are approximate
H-Pos
Horizontal Position Optimum setting.
31
V-Pos
Vertical Position Optimum setting.
-44
H-Amp
Horizontal Amplitude Optimum setting.
-4
V-Amp
Vert. Amplitude Optimum setting.
11
EW-Amp 1
EW-amplitude Optimum setting.
- 35
Lower Corner
Lower Corner Optimum setting.
4
Trapez 1
Trapezium-comp Optimum setting.
-4
Upper Corner
Upper Corner Optimum setting.
1
V-Sym
Vertical Symmetry Optimum setting.
-13
V-Lin
Vertical Linearity Optimum setting.
34
Angle
Angle Optimum setting.
0
Bow
Bow Optimum setting.
1
Receive a PAL Colour Bar Pattern. For
DVCO DVCO alignment press "Blue" button, wait
DVCO
-1 until the colours are changing slowly and
press "STR".
Highlight High 0373 0343 0350
Optimum setting.
Lowlight Low 0161 0154 0160
Sub-Brightness
Sub-Brightness Optimum setting.
-13
6
VIDEO BLOCK DIAGRAM
Pr Pb Y
AV4C
AV1 H4 A4
R1 R EXT R EXT
VIDEO IN 20 G1 2 12 7 7 39 IC1701
3 IC3301 G EXT G EXT
IC1501
B1 11 8 8 40 VSP9407VKB11 DDP3315CQAE3
VIDEO OUT 19 4 TDA8601T/C1 B EXT B EXT
R2 10 9 9
RED IN 15 6 RGB & FB SW 41 VIDEO SIGNAL DEFLECTION
G2 MAIN Y/CVBS
7 MATRIX 11 11 55 PROCESSOR PROCESSOR
B2 R OUT
GREEN IN 11 8 MAIN C Q1705 Q1708
12 12 56 8bit 42
BLUE IN 7 Y Y0÷Y7 Y0÷Y7 G OUT
Q3015 14 14 43 Q1704 Q1707
Pb 57 B OUT
AV2 VIDEO OUT 15 15 44 Q1703 Q1706
Q3013 Pr 58 SENSE
AV2 16 16 47 46 48 35
AV1 VIDEO IN
51 52 53
24, 22 41
PIP_CVBS/Y
Y
Y/VIDEO IN 20 44 Q1802 3 3
PB1
AV2 Y/ VIDEO IN
PR1
17, 15 PIP_C
VIDEO OUT 19 47 Q1801 4 4
AV2 C IN 3 5
C IN 15 19 14
MAIN C
AV4 Y/ VIDEO IN 1 IC1503
10, 8 58 Q3011
AV4 C IN
NJM2283M-TE1
AV4 12 IC3001 VIDEO SWITCH
CXA2069Q
Y/VIDEO IN 20 1
VIDEO OUT 19 Q3014 3 VIDEO/AUDIO
MATRIX MAIN Y/CVBS
C/RED IN 15 5 H5 A5 R OSD
56 Q3301 IC1101 112
TEXT CVBS
GREEN IN 11 63 SDA6000-A23 G OSD
Q3016 1 1 Q1125 121
113
BLUE IN 7 MICRO B OSD
PROCESSOR 114
7
AV3 C
AV3 Y
AV3 CVBS
TUNER CVBS
H - BOARD A - BOARD
H1 15 20 21 22 A2 6 4 3 5
D1 15 20 21 22 L2 6 4 3 5
D - BOARD L - BOARD
TUNER
VIDEO Q109
D8 1 2 4
G7 1 2 4 IC351
3 9 Q351
G - BOARD R OUT
3 IC361 9 Q361 CRT
G OUT
AV3 IC371 9 Q371
3
B OUT
Y
C
AUDIO BLOCK DIAGRAM
AV1 H1 D1 IC2001
AV1 R IN AV3 R AV3 R
RIGHT IN 2 25 4 25 25 MSP3410GAB83
AV1 L IN TUNER
LEFT IN 6 23 AV3 L AV3 L
AV1 R OUT
2 24 24 60 MONO IN AM
RIGHT OUT 1 45
IC3001
TUNER R TUNER R
AV1 L OUT CXA2069Q 64 18 36 MSP
LEFT OUT 3 43 18 67 ANA IN 1 Q101 Q102
VIDEO/AUDIO TUNER L TUNER L
62 17 17 37 AUDIO
MATRIX MAIN R
AV2 R OUT PROCESSOR
54 Q3010 9 9 57 X101 X102
AV2 R IN
RIGHT IN 2 18 MAIN L
AV2 L IN L OUT
LEFT IN 6 16 52 Q3009 8 8 56
AV2 R OUT 78 D CTRL Q106
RIGHT OUT 1 40
AV2 L OUT
LEFT OUT 3 38
24 25 27 28
AV4 R IN
11
AV4 L IN
AV4 9
HP L
HP R
RIGHT IN 2 Q2005
LEFT IN 6
SPKR OUT L
SPKR OUT R
Q2004
RIGHT OUT 1 IC251
LEFT OUT 3 Q2003 LA4282
Q2002 AUDIO OUTPUT
2 L IN R OUT 7
AUDIO
MONITOR 5 R IN L OUT 11
8
OUT
L Q3006
R Q3005
H - BOARD D - BOARD
D8 6 7 16 14 D17 4 1
G7 6 7 16 14 G16 4 1
G - BOARD G14
1
R
4
L
3 HP L
5 HP R
AV3
R
IC2351
OP. AMPLIFIER
NJM4556AD
L
HP R 7
HP L 1
2L
3R
HEADPHONE
CONTROL BLOCK DIAGRAM
RC SIG
SCL2
SDA2
SCL1
SDA1
SDA3
SCL3
D3 2 3 4 5 6 8 7
A1 D2 TUNER
BUS
A - BOARD SDA3
SDA1 (3,3V) 35 35 SDA2 SDA2
SDA1 (3,3V) 6 SCL3
SCL1 (3,3V) 34 34 SCL2
SCL1 (3,3V) 13 SDA2 SCL2
IC1501 RST MAIN 33 33 AFC
RESET 24 SCL2 Q103
32 32 SDA2
VIDEO SIGNAL FBL1 SDA1 3 SDA2 SCL2
PROCESSOR 37 31 31 IC2001
SCL1 2 SCL2
30 30 21 RESET AUDIO AFC
ON/OFF
Q1104 28 28 PROC.
AFC
VPROT 32 27 27
BUS
IC1503 ROTATION PROT1
PWM1 20
NJM2283M-TE1 SDA1 (3,3V) 15 15 FBT, HEATER D - BOARD
SDA1 (3,3V) 64
VIDEO SWITCH SCL1 (3,3V)
SCL1 (3,3V) 63
IC1701 RST MAIN
2 7 12 RESQ 62
DEFLECTION ON/OFF
PROCESSOR VSTBY 24 Q1717 Q1718
G - BOARD
BUS
SDA1 (3,3V) Q251
SCL1 (3,3V)
PROT1 Q252 Q1901 IC1900
ON/OFF Q2001
SDA1 (3,3V) D8 G7
ROTATION
5 6 Q1002 D1001
SDA1 SCL1 IC1101 IC1107 SCL1 (3,3V) 9 9
LED SBY
MICRO BUS LEVEL SDA1 10 10
IC1104 RC SIG
PROCESSOR SHIFTER 11 11 RC1001
EAROM SCL1
78 YUV SW
3,3V=>5V 12 12 RC RECEIVER
SDA1 SDA2
SDA1 99 2 SDA1 SDA1 18
SCL1 SCL2
SCL1 98 3 SCL1 SCL1 17 Q2006
SDA2 KEYSCAN
SDA2 101 4 SDA2 SDA2 16 SDA3
SCL2
SCL2 100 5 SCL2 SCL2 15 SCL3
SDA3 D28 G18
IC1102 SDA3 75 6 SDA3 SDA3 14 ON/OFF
9
SCL3 AUDIO MUTE POWER SUPPLY
RST MAIN
SMUTE2
6 6
AUDIO MUTE
ROTATION
LED SBY
FLASH MEMORY SCL3 13
RC SIG
KEYSCAN
SCL3 74 7 SCL3
CE 26 46 CSROM Q1106
D0÷D15 ON/OFF 1 2 3 4 6 28 30
ON/OFF 92 LED SBY D1
PROT1
PROT1 93 RST MAIN
AUDIO MUTE
D0÷D15 AUDIO MUTE 90
RESET IN H1 1 2 3 4 6 28 30
RST IN 73
H - BOARD AV1
D0÷D15 CS 19 44 CSSDRAM 4
IC1103 8 SLOW1
BUS
IC1106