Panasonic EURO7 TX36PG50 Schematic

SPECIFICATIONS

Power Source: 220-240V a.c., 50Hz Power Consumption: 181W Stand-by Power

Consumption: 2.8W Aerial Impedance: 75Ω unbalanced, Coaxial Type Receiving System: PAL I, PAL-525/60

M.NTSC NTSC (AV only)

Receiving Channels: UHF E21-E69 Intermediate Frequency:

Video/Audio

Video 39.5MHz Audio 33.5MHz

32.95MHz (NICAM)

Colour 35.07MHz

Terminals:

AV1 IN Video (21 pin) 1V p-p 75Ω

Audio (21 pin) 500mV rms 10kΩ RGB (21 pin)

AV1 OUT Video (21 pin) 1V p-p 75Ω

Audio (21 pin) 500mV rms 1kΩ

ORDER No. SM-01001

Colour Television

TX-36PG50

EURO-7 Chassis

Audio (21 pin) 500mV rms 10kΩ S-Video IN Y: 1V p-p 75Ω (21-pin) C: 0.3V p-p 75Ω RGB (21 pin)

AV4 OUT Video (21 pin) 1V p-p 75Ω

Audio (21 pin) 500mV rms 1kΩ

High Voltage: 32kV ± 1kV Picture Tube: W86LPX955X07 86cm Audio Output: Front Left/Right 2 x 20W

(Music Power) Subwoofer 23W

External Centre 19W External Surround 2 x 19W 8Ω Impedance

Digital Audio Input Coaxial / Optical Dolby Surround Out 6 x Dolby Surround Out RCA

(Rear) Headphones: 8Ω Impedance

3.5mm

Accessories supplied : Remote Control

2 x R6 (UM3) Batteries TS-36PG50 Cabinet / Speaker pack

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 Selectable output (21 pin)

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

Dimensions:

Height: 637mm Width: 874mm Depth: 585mm

Net weight: 85kg Specifications are subject to change without notice.

Weights and dimensions shown are approximate. NOTE: This Service Manual should be used in conjunction with

the EURO-7 Technical guide.

Panasonic CS ( U.K. ) Ltd.

WILLOUGHBY ROAD,

BRACKNELL,

BERKS.,

RG12 8FT.

CONTENTS

SAFETY PRECAUTIONS..........................................................................................................................................................2

SERVICE HINTS.......................................................................................................................................................................3

SERVICE POSITION.................................................................................................................................................................4

ADJUSTMENT PROCEDURE AND FACTORY SETTINGS.....................................................................................................5

WAVEFORM PATTERN TABLE...............................................................................................................................................6

ALIGNMENT SETTINGS...........................................................................................................................................................7

BLOCK DIAGRAMS..................................................................................................................................................................8

PARTS LOCATION.................................................................................................................................................................13

REPLACEMENT PARTS LIST................................................................................................................................................14

SCHEMATIC DIAGRAMS.......................................................................................................................................................30

CONDUCTOR VIEWS.............................................................................................................................................................37

SAFETY PRECAUTIONS

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 33kV 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 above measurements.

6. The potential at any point should not exceed

1.4V rms. 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 33kV 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. 32kV ± 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)

SERVICE HINTS

Focus

Screen

How to remove the rear cover

1. Remove the 10 screws as shown in Fig.2.

SCREWS

LOCATION OF CONTROLS

SCREWS

Fig.2.

L-Board

Z-Board

DP-Board

A-Board

H-Board

D-Board

DF-Board

Fig.3.

DG-Board

U-Board

G-Board

K-Board

HOW TO MOVE THE CHASSIS INTO SERVICE POSITION

(C)

(D)

(A)

(B)

1. Remove the 3 screws (B) and (C) shown in Fig.5. / Fig.6., and remove the 2 speakers from the cabinet.

2. Affix the support strap supplied in the service pack (TZS1EK002) using a back cover screw, into the top right-hand cabinet rib (A) shown in Fig.4.

3. Hold and lift the rear of the chassis and gently pull toward you, as shown in Fig.4.

4. Release the respective wiring clips and rotate the chassis vertically through 90°, anti-clockwise.

5. Locate the base of the chassis frame into location (D), shown in Fig.7. / Fig.9.

6. Clip the chassis frame onto the support strap, shown in Fig.7. / Fig.8.

7. After servicing replace the speakers, and ensure all wiring is returned to it’s original position before returning the receiver to the customer.

Fig.5.

Fig.4.

Fig.7.

Fig.6.

Fig.8.

Fig.9.

ADJUSTMENT PROCEDURE

Item / Preparation Adjusment/Confirmation +B SET-UP

4. Receive a Window pattern.

5. Set the controls :Brightness Minimum Contrast Minimum Volume Minimum

CUT OFF

1. Receive a Window pattern.

2. Degauss the tube externally.

3. Set the TV into Service Mode 1.

4. Select Sub brightness mode.

Confirm the following voltages.

A - Board

A1 Pin2 7.5 ± 0.5V IC1252 Pin2 2.5 ± 0.25V A1 Pin12 -20 ± 0.5V IC1251 Pin3 3.3 +0.3 / -0.2V A1 Pin16 20 ± 0.5V IC3302 Pin3 12 ± 0.6V A2 Pin15 30 ± 0.5V IC2707 Pin3 8 ± 0.4V A2 Pin6 15 ± 0.5V L2707 (IC2708) 9 ± 0.4V A3 Pin4 15 ± 0.5V L2704 (IC2706) 5 ± 0.2V A3 Pin2 -15 ± 0.5V L2716 (IC2705) 3.3 ± 0.2V

D – Board

TPD8-GND 7.5 ±0.5V TPD9-TPD11 38.5 ± 2V TPD10-GND 15.5 ± 1V TPD13-GND 14.5 ± 1V TPD15-GND 144.8 ± 1V TPD32-GND 209 ± 10V C864-GND -15.5 ± 1V D2 Pin15-GND 31 ± 1V To adjust Cutoff connect an oscilloscope to the Blue cathode. Adjust "Cutoff" value using the "Yellow" and "Blue" buttons until the black level is 170V ± 5V, press "STR" to store the value. Remove the oscilloscope. Select Highlight/Lowlight mode press "5" to collapse the screen and adjust the screen “VR” until the display is just visible, press "5" to return to service mode.

Using the "Yellow" and "Blue" buttons adjust until optimum picture white balance is achieved, press "STR " to store the value. Select Sub Brightness mode and adjust until optimum picture brightness is achieved.

L2717 (IC2709) 3.3 ± 0.2V

FACTORY SETTINGS

To return customer settings to factory settings and clear owner ID of all information input by the customer, enter Self-Check mode. Press the down (-/v) button on the customer controls at the front of the TV set, at the same time pressing the STATUS button on the remote control. To exit Self Check, switch off the TV set at the power button. NOTE: Self Check should only be used when refurbishing the TV set and not during normal repair work.

MEM : O.K. GC1 : O.K. GC2 : O.K. VDU : O.K. CIP : O.K. RGB : O.K. AVSW : O.K. Tun1 : O.K. Tun2 : O.K. DAC1 : O.K. MSP : O.K. DOLBY : O.K. CODEC : O.K. DAC2 : O.K. DAC3 : O.K.

Sum : ****

OPTION 1 : 01 OPTION 2 : 00 OPTION 3 : 13 OPTION 4 : 10 OPTION 5 : 00 OPTION 6 : 50 OPTION 7 : 80 OPTION 8 : 41 OPTION 9 : 83 OPTION 10 : 80 OPTION 11 : 19 OPTION 12 : 08 OPTION 13 : FA Check : BA

Factory use only

If the CCU ports have been checked and found to be incorrect or not located then " - - " will appear in place of "O.K.".

WAVEFORM PATTERN TABLE

Note: All waveforms have been taken using a standard colour bar pattern.

Video Out IC3001 Pin 56

2.2V

Vert Out IC451 Pin 3

88V

HFLB A3 Pin 11

10mS

64µS

Luminance In IC1315 Pin 37

0.9V

VFLB IC451 Pin 6

R - Out IC1315 Pin 23

20mS

32µS

Vert Drive A44 Pin 24

0.9V

10mS

H - Drive A3 Pin 10

32µS

G - Out IC1315 Pin 21

B - Out IC1315 Pin 19

SVM Out A44 Pin 43

32µS

R - Y IC1315 Pin 38

0.8V

E/W Out IC501 Pin 1

32µS

B - Y IC1315 Pin 39

0.8V

32µS

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, 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.

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 Settings / Special features

Horizontal Position

Vertical Position

Horizontal Amplitude

Vertical Amplitude

Parabola

Trapezoid

Horizontal Parallel

Vertical Linearity

Top Corner

Bottom Corner

Vertical Symmetry Correction

H – Pos

V – Pos

111

H – Amp

V – Amp

134

Parabola

Trapezoid

124

H – Parallel

V – Linear

Top – Corner

Bottom – Corner

V – S – Correct

Optimum setting.

Center Correction

DAF - Phase

Highlight

Lowlight

Sub-Brightness

Video Gain 2

Splitter Gain (Tuner)

C – Correct

DAF – Phase

205

High 0144 0126 0128 Low 0331 0340 0384

Sub-Brightness

144

Video Gain 2

157

SPL. Gain

Optimum setting.

VIDEO BLOCK DIAGRAM

AUDIO BLOCK DIAGRAM

CONTROL BLOCK DIAGRAM

POWER SUPPLY BLOCK DIAGRAM

WIRING BLOCK DIAGRAM

PARTS LOCATION

NOTE:

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

13 10

16 18 22

+ 28 hidden pages