Panasonic TX-29PX20D, TX-29PX20F, TX-29PX20P Service Manual

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

Power Consumption: 107W

Stand-by Power
Consumption: 0,6W

Aerial Impedance: 75Ω unbalanced, Coaxial Type

Receiving System: PAL-I, B/G, D/K, PAL-525/60

SECAM B/G, D/K, L/L’
M.NTSC (AV only)
NTSC (AV only)

Receiving Channels:

VHF E2-E12 VHF H1-H2 (ITALY)
VHF A-H (ITALY) VHF R1-R2
VHF R3-R5 VHF R6-R12
UHF E21-E69 CATV (S01-S05)
CATV S1-S10 (M1-M10) CATV S11-S20 (U1-U10)
CATV S21-S41 (HYPERBAND)

Intermediate Frequency:
Video/Audio

Video 38,9MHz, 33,9MHz
Sound 33,4MHz (B/G), 33,16MHz (A2)

33,05MHz (NICAM B/G,D/K,L)
32,4MHz (D/K),32,66MHz (CZ STEREO)
40,4MHz (L’), 39,75MHz (L’NICAM)

Colour 34,47MHz (PAL)

34,5MHz, 34,65MHz (SECAM)
38,3MHz, 38,15MHz (SECAM L’)

Terminals:

AUDIO MONITOR OUT Audio (RCAx2) 500mV rms 1kΩ

AV1 IN Video (21 pin) 1V p-p 75Ω

Audio (21 pin) 500mV rms 10kΩ
RGB (21 pin) 0,7V p-p 75Ω

AV1 OUT Video (21 pin) 1V p-p 75Ω

Audio (21 pin) 500mV rms 1kΩ

AV2 IN Video (21 pin) 1V p-p 75Ω

Audio (21 pin) 500mV rms 10kΩ
S-Video IN Y: 1V p-p 75Ω
(21-pin) C:0,3V p-p 75Ω

AV2 OUT Video (21 pin) 1V p-p 75Ω

Audio (21 pin) 500mV rms 1kΩ

AV3 IN S-Video IN Y: 1V p-p 75Ω

(4-pin) C:0,3V p-p 75Ω
Audio (RCAx2) 500mV rms 10kΩ
Video (RCAx1) 1V p-p 75Ω

AV4 IN Video (21 pin) 1V p-p 75Ω

Audio (21 pin) 500mV rms 10kΩ
RGB (21 pin) 0,7V p-p 75Ω
S-Video IN Y: 1V p-p 75Ω
(21-pin) C:0,3V p-p 75Ω

AV4 OUT Video (21 pin) 1V p-p 75Ω

Audio (21 pin) 500mV rms 1kΩ

AV4C IN Video (RCAx3) Y:1V p-p 75Ω

Pb, Pr: 0,7V p-p 75Ω

High Voltage: 30,5kV ± 1kV

Picture Tube: A68ELO50X71 68cm

Audio Output: 2x10W RMS, 2x20W MPO,

8Ω impedance

Headphones: 8Ω Impedance

Accessories
supplied : Remote Control

2 x R6 (UM3) Batteries

Dimensions:

Height: 586mm
Width: 781mm
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
a.c. supply before servicing a hot chassis.

2. When servicing, observe the original lead dress in the
high voltage circuits. If a short circuit is found, replace
all parts that have been overheated or damaged by
the short circuit.

3. After servicing, see that all the protective devices
such as insulation barriers, insulation papers, shields
and isolation R-C combinations are correctly
installed.

4. When the receiver is not being used for a long period
of time, unplug the power cord from the a.c. outlet.

5. Potentials as high as 31,5kV are 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
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
checks to prevent the customer from being exposed
to shock hazard.

LEAKAGE CURRENT COLD CHECK

1. Unplug the a.c. cord and connect a jumper between
the two prongs of the plug.

2. Turn on the receiver’s power switch.

3. Measure the resistance value with an ohmmeter,
between the jumpered a.c. 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 4M ohm and
20M ohm. When the exposed metal does not have a
return path to the chassis, the reading must be
infinite.

LEAKAGE CURRENT HOT CHECK

1. Plug the a.c. cord directly into the a.c. outlet. Do not
use an isolation transformer for this check.

2. Connect a 2kΩ 10W resistor in series with an
exposed metallic part on the receiver and an earth,
such as a water pipe.

3. Use an a.c. voltmeter with high impedance to
measure the potential across the resistor.

4. Check each exposed metallic part and check the
voltage at each point.

5. Reverse the a.c. plug at the outlet and repeat each of
the previous measurements.

6. The potential at any point should not exceed
1,4 Vrms. In case a measurement is outside the 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.

HOT CHECK CIRCUIT

a.c. VOLTMETER

2kΩ 10 Watts

TO INSTRUMENT'S EXPOSED
METALLIC PARTS

Fig. 1.

X-RADIATION WARNING

1. The potential sources of X-Radiation in TV sets are
the high voltage section and the picture tube.

2. When using a picture tube test jig for service, ensure
that the jig is capable of handling 31,5kV without
causing X-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 should indicate:

30,5kV ± 1kV.
If the meter indication is out of tolerance, immediate
service and correction is required to prevent the
possibility of premature component failure.

3. To prevent any X-Radiation possibility, it is essential
to use the specified tube.

WATER PIPE

(

EARTH)

2

SERVICE HINTS

How to remove the rear cover

1. Remove the 9 screws as shown in Fig.2.

SCREWS

LOCATION OF CONTROLS

SCREWS

Fig. 2

L-BoardH-Board A-Board Focus

Fig. 3

3

Screen

D-Board

G-Board

ADJUSTMENT PROCEDURE

A

Item / Preparation Adjustments
+B SET-UP

1. Receive a Window pattern.

2. Set the controls :

Brightness Minimum

Contrast Minimum

Volume Minimum

CUT OFF / Ug2 Test

1. Receive a Window pattern.

2. Normalize the TV set.

3. Set brightness: minimum.

Confirm the following voltages:

TPD1 205 ± 10V TPD11 5 ± 0,5V
TPD2 137 ± 2V TPD12 3,3 ± 0,1V
TPD3 42 ± 2V TPD13 2,5 ± 0,1V
TPD5 42 ± 2V TPD14 3,3 ± 0,1V
TPD6 12,5 ± 1V TPD15 5 ±0,5V
TPD7 -12,5 ± 1V TPD16 5 ± 0,5V
TPD8 30,5 ± 1V TPG3 7,5 ± 0,5V
TPD9 9± 1V TPG5 300 ± 10V
TPD10 8 ± 0,5V

To adjust Cutoff connect an oscilloscope to the Blue cathode. Adjust
the screen VR until the black level is 170V +0V/-5V.

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.
DDP O.K.
VSP O.K.

VSW O.K.
TUN O.K.
MSP O.K.
DPL --­MAS ---

TX-29PX20D TX-29PX20F

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

SUM ****

TX-29PX20P

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.

Alignment Function

Horizontal Position

Vertical Position

Horizontal Amplitude

Vert. Amplitude

EW-amplitude

Lower Corner

Trapezium-comp

Upper Corner

Vertical Symmetry

Vertical Linearity

Setting indication

Note: All setting values are approximate

H-Pos

31

V-Pos

-44

H-Amp

-4

V-Amp

–11

EW-Amp 1

- 35

Lower Corner

4

Trapez 1

-4

Upper Corner

1

V-Sym

-13

V-Lin

34

Settings / Special features

Optimum setting.

Optimum setting.

Optimum setting.

Optimum setting.

Optimum setting.

Optimum setting.

Optimum setting.

Optimum setting.

Optimum setting.

Optimum setting.

Angle

Bow

DVCO

Highlight

Lowlight

Sub-Brightness

Angle

0

Bow

1

DVCO

-1

High 0373 0343 0350
Low 0161 0154 0160

Sub-Brightness

-13

Optimum setting.

Optimum setting.

Receive a PAL Colour Bar Pattern. For
DVCO alignment press "Blue" button, wait
until the colours are changing slowly and
press "STR".

Optimum setting.

Optimum setting.

6

A

A

Y5A

Q1705 Q1708

R OUT

42

Q1704 Q1707

G OUT

43

Q1703 Q1706

B OUT

44

643 5

643 5

L2

A2

CRT

SENSE

35

IC1701

IC1501

39

R EXT

798

A4

7H49

YPbPr

VIDEO BLOCK DIAGRAM

R EXT

AV4C

12

DEFLECTION

PROCESSOR

DDP3315CQAE3

40

G EXT

8

G EXT11B EXT

0÷Y7

8bit

Y0÷Y7

IDEO SIGNAL

PROCESSOR

VSP9407VKB11

41

55

56

B EXT

MAIN C

MAIN Y/CVBS

Y

11

12

11

12

10

52 53

51

R OSD

B OSD

G OSD

114

112

113

PB1

PR1

41

Y

PIP_CVBS/Y

3

3

Q180247Q1801

44

PIP_C

4

4

35

IC1503

14

1

MAIN C

Q3011

58

NJM2283M-TE1

IDEO SWITCH

46 4847

57

58

Pr

Pb

14

15

16

14

15

16

AV2 VIDEO OUT

IC1101

A5

H5

Q3301

MAIN Y/CVBS

56

SDA6000-A23

121

TEXT CVBS

Q1125

1

1

Q3016

MICRO

PROCESSOR

A - BOARD

H - BOARD

L - BOARD

D - BOARD

Q351

IC351

R OUT

3

G - BOARD

IC361

G OUT

3

71

IC371

B OUT

3

IC3001

CXA2069Q

12

1

AV4

Y/VIDEO IN 20

MATRIX

IDEO/AUDIO

3

63

V3 CVBS

V3

Q3014

VIDEO OUT 19

C/RED IN 15

TUNER CVBS

BLUE IN 7

GREEN IN 11

V3 C

15 20 21 22

H1

15 20 21 22

D1

VIDEO

TUNER

124

D8

124

G7

AV3

C

AV1

IC3301

2G13

R1

VIDEO IN 20

MATRIX

RGB & FB SW

TDA8601T/C1

7

6

8

4

R2

B2

B1

G2

Q3015

BLUE IN 7

RED IN 15

GREEN IN 11

VIDEO OUT 19

17, 15

19

24, 22

Q3013

AV1 VIDEO IN

AV2

Y/VIDEO IN 20

10, 8

AV2 C IN

AV4 C IN

AV2 Y/ VIDEO IN

AV4 Y/ VIDEO IN

C IN 15

VIDEO OUT 19

7

AM

TUNER

MSP

Q102

Q101

102

101

Q106

IC251

LA4282

R OUT 7

L OUT 11

AUDIO OUTPUT

2 L IN

5 R IN

41

41

D17

G16

G14

L

R

1

4

AV3

R

HEADPHONE

L

2 L

3 R

IC2001

NA IN 1

67

60 MONO IN

UDIO

78 D CTRL

PROCESSOR

MSP3410GAB83

36

57

D1

AV3 R

25

25H124

37

AV3 L

TUNER L

TUNER R

24

18

17

18

17

R OUT

9

9

56

L OUT

8

8

AUDIO BLOCK DIAGRAM

28

27

24 25

SPKR OUT L

SPKR OUT R

HP L

HP R

Q2005

Q2002

Q2003

Q2004

671614

6 7 16 14

D8

G7

D - BOARD

G - BOARD

IC2351

NJM4556AD

OP. AMPLIFIER

3 HP L

5 HP R

HP L 1

HP R 7

H - BOARD

AV1

AV3 R2AV3 L

4

25

AV1 R IN

RIGHT IN 2

23

AV1 L IN

LEFT IN 6

TUNER R

64

IC3001

CXA2069Q

45

43

AV1 L OUT

AV1 R OUT

LEFT OUT 3

RIGHT OUT 1

TUNER L

MAIN R

62

MATRIX

IDEO/AUDIO

Q3010

Q3009

MAIN L

54

52

Q3006

Q3005

18

16

AV2 L IN

AV2 R IN

LEFT IN 6

AV2

RIGHT IN 2

11

40

AV2 R OUT

RIGHT OUT 1

9

38

AV4 L IN

AV4 R IN

AV2 L OUT

AV4

LEFT IN 6

LEFT OUT 3

RIGHT IN 2

LEFT OUT 3

RIGHT OUT 1

OUT

AUDIO

L

MONITOR

R

8

Y

A

RC SIG

SDA3

SDA1

SCL1

SDA2

SCL2

SCL3

7

8

56

234

D3

SCL2

SDA2

TUNER

SCL2

SDA2

SCL3

SDA3

353332

34

D2

SDA2

Q103

AFC

SDA2

SCL2

SCL2

IC2001

3 SDA2

2 SCL2

SDA1

SCL1

31

AFC

UDIO

21 RESET

ON/OFF

30

PROC.

BUS

AFC

PROT1

282715

AV1

8 SLOW1

10 (SCL3)

D1001

IC1900

H1

Q3001

SERVICE

H - BOARD

BUS

D - BOARD

G - BOARD

Q1901

LED SBY

ROTATION

Q251

Q252

Q2001

FBT, HEATER

G7

D8

Q1002

9

9

RC1001

RC SIG

101112

101112

RC RECEIVER

KEYSCAN

Q2006

SMUTE2

UDIO MUTE

RST MAIN

KEYSCAN

RC SIG

LED SB

ROTATION

D28 G18

POWER SUPPLY

ON/OFF

6

6

30

28
6

4

123

462830

123

D1

AV2

16 FBIN1

12 (SDA3)

8 SLOW2

Q3000

SCL3

SDA3

568

H5

AV4

8 SLOW4

10 AV LINK

16 FBIN2

14

15

MATRIX

IC3301

13

RGB & FB SW

5

CH SEL

SDA3

SCL3

SLOW1

SLOW2

SLOW4

Q3017

Q3003

Q3004

AUDIO MUTE

SERVICE

KEYSCAN

9

RC SIG

LED SBY

141516

ROTATION

17

36

34

33

27

MATRIX

IC3001

20

IDEO/AUDIO

13

Q3007

Q3008

Q3018

RST MAIN

AV LINK

H4

6

3

18

24

RESET

FBL1

IDEO SIGNAL

31

30

37

PROCESSOR

282715

Q1104

ROTATION

PWM1 20

VPROT 32

SDA1 (3,3V)

SCL1 (3,3V)

SDA1 (3,3V) 64

ON/OFF

RST MAIN

RESQ 62

SCL1 (3,3V) 63

IC1701

DEFLECTION

12

Q1718

Q1717

VSTBY 24

PROCESSOR

BUS

PROT1

SCL1 (3,3V)

SDA1 (3,3V)

SDA1

ON/OFF

SCL1 (3,3V)

SDA1 (3,3V)

IC1107

BUS LEVEL

MICRO

IC1101

78 YUV SW

35A1343332

BUS

RST MAIN

SCL1 (3,3V)

SDA1 (3,3V)

CONTROL BLOCK DIAGRAM

SDA1 (3,3V) 6

SCL1 (3,3V) 13

IC1501

SCL1

SDA2

SCL1

SDA1

SDA1 18

SHIFTER

3,3V=>5V

2 SDA1

SDA1 99

PROCESSOR

568

9

A5

141516

Q1113

AFC

RC SIG

SERVICE

LED SBY

SCL2

SCL3

SDA3

Q1106

LED SBY

RST MAIN

AUDIO MUTE

KEYSCAN

3

17

18

Q1116

Q1115

6

A4

FBL1

AV LINK

Q1112

SCL2

SDA2

SDA3

SCL3

PROT1

ON/OFF

RESET IN

AUDIO MUTE

4

SCL1 17

SCL2 15

SCL3 13

SDA2 16

SDA3 14

3 SCL1

4 SDA2

7 SCL3

5 SCL2

6 SDA3

93

92

SDA2 101

SCL2 100

SCL3 74

SDA3 75

PROT1

ON/OFF

SCL1 98

46 CSROM

73

RST IN

AUDIO MUTE 90

D0÷D15

IC1103

44 CSSDRAM

76

125

AFC

SERVICE

AV LINK OUT 7

Q1102Q1101

5

77

124

RC SIG

VPROT 12

LED SBY

KEYSCAN
AV LINK IN 6

Q1111

Q1108

Q1110

Q1109

27

IC1503

IDEO SWITCH

NJM2283M-TE1

A - BOARD

6

5

SCL1

SDA1

EAROM

IC1104

CE 26

IC1102

FLASH MEMORY

D0÷D15

19

CS

D0÷D15

SDRAM

IC1106

9

VERT DY

3

D16

HORIZ DY

1

4

D15

DIODE

MODULATOR

10

FBT

3

8

IC451

VERTICAL

6

LA7876N

D - BOARD

A - BOARD

DEFLECTION BLOCK DIAGRAM

Q1102 Q1101

Q551

T501

Q503

HFLB

H DRIVE

VFLB

13

13A112

VFLB

12

964

964

EW

EW

H DRIVE

Q1713

Q1715

Q1701 Q1702

VERT+

D2

V SYNC

Q703

Q1714

IC1701

DDP3315CQAE3

DEFLECTION

PROCESSOR

VS 10

HFLB 30

VERT+ 37

VPROT 32

HOUT 23

EW 39

IC1501

VS 23

H SYNC 8

IDEO SIGNAL

PROCESSOR

VSP9407VKB11

MICRO

IC1101

SDA6000-A23

V SYNC 102

PROCESSOR

H SYNC 103

V PROT 12

10

r

r

r

UDIO

V

V

V

V

V

V

V

V

V9V

V8V

V8V

IC251

OUTPUT

10

41V/AUDIO2

T849

42V

Q898

D897

10

9VIN

D884

Q897

D896

28V/AUDIO1

11

9V HEADER

10,5V

5DRAIN

3

4

5V HEADER

D870

6,5V

13

2

IC849

D871

14

1

POWER

5V HEADER

IC3807

R887

D895

137V

18

2VCC

5

SUPPLY

POWER BUS

8V

9V

5V

2

4

+5V

TUNER

IC899

D847

1GND

R843

R842

9V HEADER

+5V

+33V

2

IC3801

21

IC3804

4

1

IC38023IC3803

UDIO

IC2001

5V STBY

3

1

VERT

IC451

T551

65,66

PROC.

11,12,13

SB2,5V

2

IC3806

3

2

15V

-15V

D558

2

7

9

R567

5V HEADER

1

39

IC3805

7

D557

1

D554

1

27V

8V

3

SB3,3V

2

T501

D553

8

SB2,5

26

5

24 25

5

22

3,3

SB5

SB3,3

8

5

5

4

10 17 20

D2

9

27 34

5V

26

24 25

22

10 17 20

1,8V

3

1

IC1502

1,8V

1,8V

3,3V

5,28,34,66

35,42,50,64,68

IC1501

VIDEO

3,3V

7,12,25,72

A1

IC1108

IC1105

IC1103

5

3,3V_STBY

9V

9V

Q1707

Q1706

A- BOARD

9

27 34

5

2

3,3V_STBY

5V

9V

9V

9V

13

Q1719

Q1708

3,3V

3,15

44,59

SDRAM

IC1106

1,3,9,14

27,43,49

3,3V_STBY

3,3V_STBY

POWER BUS

IC1503

5V

3,3V

73

47

IC1701

DEFLECTION

IC1102

37,47

3,3V_STBY

3,3V_STBY

3,3V_STBY

3,3V_STBY

2,5V_STBY

2,5V_STBY

21,87

85,106

14,32,42

53,61,69

111,116,119,123

MICRO

IC1101

FLASH MEM

5V_STBY

IC1107

BUS L. SHIFT.

20

9V

A2

EAROM

IC1104

8

3,3V_STBY

1

D- BOARD

1

D11

1G43

0V

400V

+

POWER SUPPLY BLOCK DIAGRAM

~

PFC

D801

-

Filte

5V SBY

3

1

D28

1

G18

~

2,3,7,8

SB5V

S1

T860

P2

SUPPLY

IC801

STBY POWER

SB5V HEADER

9V HEADER

9V

3

15

11

12

D9

3

15G612

11

S2

P1

Q860

5

4

POWER BUS

SB5V

1

1

VCC

RC1001

8

IC2351

10

IC1900

D854

RL801

S801

Q853

Line

Line

F801

1G14

MAINS IN

Q854

Filte

D860

Filte

RL803

Q856

Q855

D807

1G22

DEGAUSS

COIL

D861

D862

G - BOARD

L- BOARD

1

D12

1L33

147V

Q908

6

2

IC371

6

2

IC361

6

2

IC351

Q906

H1

D1

3

200V

42

1

MATRIX

IC3001

IDEO/AUDIO

MATRIX

IC3301

RGB & FB SW

H- BOARD

9V

1

L2

11

PARTS LOCATION

NOTE:

The numbers on the exploded view below
refer to the exploded view section of the
Replacement Parts List.

19

16

4

22

5

17

18

15

6

11

21

23

12

20

9

14

13

2

7

10

8

1

3

12