Philips M123A Page 15 Service Manual Download | Manualshive

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Colour Television Chassis: M123A

42

0 V

5.1V

5.1V

0 V

5.2V

2.2V

2.0V

0 V

5.1V

0 V

0 V

1 V

1.5V

6.0V

4.1V

5.1V

0 V

0 V

2.3V

2.6V

2.3V

0 V

2.3V

0 V

3.4V

2.3V

4.6V

3.5V

8.8V

4.9V

1.8V

4.3V

2.7V

2.1V

2.5V

4.5V

2.2V

4.8V

4.1V

0 V

0 V

0 V

4.4V

4.8V

1.8V

1.8V

2.5V

0 V

8.8V

2.6V

2.7V

2.5V

0 V

0 V

5.1V

5.1V

4.5V

4.2V

2.0V

0 V

4.7V

4.5V

5.0V

0 V

0.8V
0.4V

2.4V
14 V

2.4V

0 V

0.8V

6.3V

0 V
6.5V
6.5V
0 V
6.5V

3.0V

13.2V

-11.6V

-13.1V

0.2V

13.5V

3.0V

0 V
0 V
0 V

0 V

4.5 V

4.5 V

5 V
0 V

6. Block Diagram and I2C

6.2 I2C

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Summary of Contents for M123A

Page 1: ... Decoder Diagram A6 47 Video Source Switching Diagram A7 47 Side AV Diagram A8 48 Audio Amplifier Diagram A9 48 CRT Panel Diagram B 49 Transistor Test Voltage 49 Test point with Waveform Diagram 50 51 8 PCB diagram Main PCB 52 CRT PCB 53 MPX PCB 54 SIDE AV PCB 55 9 AlignmentProcedures 56 64 10 Circuit Description 65 11 List of Abbreviations 66 68 12 Spare Parts List 69 89 Copyright 2001 Philips Co...

Page 2: ...emperature 5 to 45 deg C Maximum humidity 90 Power consumption 80W Standby Power consumption 3W 1 1 2 Miscellaneous 1 2 Connections 1 2 1 Side Connections and Front Control IN1 AUDIO VIDEO S VIDEO L MONO R SIDE AV PANEL A V In 1 Audio R 0 5 Vrms 1k_ 2 Audio L 0 5 Vrms 1 k_ 3 Video CVBS 1 Vpp 75 4 S video 1 Vpp 75 TV AV SENSOR STANDBY POWER FRONT PANEL TV AV SENSOR STANDBY POWER DVD INPUT Y Cb Cr I...

Page 3: ...A 3 1 3 Chassis Review 7 1 Power Supplier 7 2 Line Deflection 7 3 Frame Deflection 7 4 Tuner IF 7 5 MCU Video IF and Sound IF 7 6 BTSC Stereo SAP Decode 7 7 Video Source Switching MSP PANEL CRT PANEL Main Chassis Panel Side AV Panel ...

Page 4: ...cord for external damage Check the strain relief of the AC power cord for proper function to prevent the cord from touching the CRT hot components or heat sinks Check the electrical DC resistance between the AC plug and the secondary side only for sets that have an isolated power supply Do this as follows 1 Unplug the AC power cord and connect a wire between the two pins of the AC plug 2 Turn on t...

Page 5: ... picture tube Never replace modules or other components while the unit is switched ON When you align the set use plastic rather than metal tools This will prevent any short circuits and the danger of a circuit becoming unstable Measure the voltages and waveforms with regard to the chassis tuner ground or hot ground depending on the area of circuitry being tested The voltages and waveforms shown in...

Page 6: ... cover 2 Now pull the rear cover backward and remove it 4 2 Service Position Main Panel 4 3 Side I O Panel Removal 4 4 Rear Cover Mounting Before you mount the rear cover perform the following checks 1 Check whether the mains cord is mounted correctly in its guiding brackets 2 Replace the strain relief of the AC power cord into the cabinet 3 Check whether all cables are replaced in their original ...

Page 7: ...Q801 shorted to earth Yes Cheek Replace Q801 Is D815 D818 OK Yes Check IC801 and the peripheral components Replace D815 D818 No No Figure 1 Fuse Blown No raster abnormal B Is the B resistance to earth ok Check the load of B No Yes Check IC802 and their peripheral components Yes Check Q830 Q831 Q832 etc Figure2 No Raster Abnormal B ...

Page 8: ... of IC401 9V Check R233 C231 and C233 yes No Figure3 No Raster B OK No No No picture dense noise dots Is the antenna feed line or the adapter broken or unsoldered Handing the antenna fault Yes No Is the signal at Pin41 Pin42 of IC201 ok Is the signal at IF pin of the tuner Is the signal at Pin SCL SDA of tuner ok No Check signal at P57 P58 of IC201 and replace the abnormal relative circuit Yes Che...

Page 9: ...ct the red probe to GND use the black probe to touch B of Q101 Are there interference particles flashing on the screen Yes Replace the Tuner No Is the voltage at P29 P36 of IC201 ok No Check and repair the 9V power supply No Bridge a capacitor of 1000pF between the input and output of Z101 Apply the pointer of multimeter at R X 1 K Ω connect the red probe to GND and use the black probe to touch B ...

Page 10: ...ace the power supply of IC1001 Then RESET NG Is the BUS ok Check IC201 and the relative circuit No No Check Replace Q1001 X1002 NG Is the waveform at P31 of IC201 ok Replace IC201 No Yes Replac e IC601 Check Replace Q604 Q605 No Figure 6 No Sound Is both 14V and 14V ok Yes No Is the signal at P1 of IC301 ok Check Replace IC301 Check signal at P16 of IC201 No Check Replace IC201 C234 Yes Check Repl...

Page 11: ...eform of pin 14 of IC901 No Q905 and its peripheral circuit No Check Pin61 of IC201 and peripheral circuit Check the logic of Pin9 Pin10 of IC901 Yes Replace IC901 Yes AV has Picture TV hasn t Picture Is the waveform at P30 of IC101 ok Check Q208 Q209 and peripheral circuit Yes Check IC201 and relative circuit please reference the previous page named Figure 5 No Figure 8 No Picture 5 Faultfinding ...

Page 12: ... of IC201 No Check the power supply of IC201 Are there H V flyback pulses at P12 of IC201 No No Check R408 R406 D404 C422 Yes Check Replace IC201 No Check the waveform at Pin57 Pin58 of IC201 No Yes Is the 33V 5 VA power supply ok Check Repair 33V power supply No Yes Is there the short circuit around the integration circuit Check Replace the tuner No Check Repair the integration Yes Figure 9 Tunin...

Page 13: ... at P9 and P55 of IC201 ok Is there the 8MHz 5Vp p sine wave oscillations at P6 of IC201 Is the voltage at P5 of IC201 ok Have P5 of IC201 shorted to GND in an instant Can the IC201 work Check Repair the reset circuit Yes Yes Yes No Check Replace IC201 No No Are C021 C022 and X001 ok No Replace the disabled components Yes No Check Q002 and peripheral circuit Yes ...

Page 14: ...Colour Television Chassis M123A 41 6 Block Diagram and I2C 6 1 Block Diagram ...

Page 15: ...3V 4 6V 3 5V 8 8V 4 9V 1 8V 4 3V 2 7V 2 1V 2 5V 4 5V 2 2V 4 8V 4 1V 0 V 0 V 0 V 4 4V 4 8V 1 8V 1 8V 2 5V 0 V 8 8V 2 6V 2 7V 2 5V 0 V 0 V 5 1V 5 1V 4 5V 4 2V 2 0V 0 V 4 7V 4 5V 5 0V 0 V 0 8V 0 4V 2 4V 14 V 2 4V 0 V 0 8V 6 3V 0 V 6 5V 6 5V 0 V 6 5V 3 0V 13 2V 11 6V 13 1V 0 2V 13 5V 3 0V 0 V 0 V 0 V 0 V 4 5 V 4 5 V 5 V 0 V 6 Block Diagram and I2C 6 2 I2C ...

Page 16: ...Colour Television Chassis M123A 43 6 Block Diagram and I2C 6 2 I2C 0 V 0 V 61 5 V 0 V 0 V 5 V 4 5 V 0 V 0 V 0 V 0 V 0 V 0 V 0 V 0 V 0 9 V 0 9 V 0 9 V 13 2 V 4 5 V 4 5 V 4 5 V 0 V 9 V ...

Page 17: ...Colour Television Chassis M123A 44 7 Electrical Diagrams 7 1 Power Supplier 7 Electrical Diagrams a 7 2 Line Deflection WF 1 WF 2 WF 3 ...

Page 18: ...Colour Television Chassis M123A 45 7 Electrical Diagrams 7 3 Frame Deflection 7 Electrical Diagrams 7 4 Tuner IF WF 4 WF 5 WF 6 ...

Page 19: ...Colour Television Chassis M123A 46 7 Electrical Diagrams 7 5 MCU Video IF and Sound IF WF 7 WF 8 WF 9 WF 10 WF 11 ...

Page 20: ...Colour Television Chassis M123A 47 7 Electrical Diagrams 7 6VBTSC Stereo SAP Decode 7 Electrical Diagrams 7 7Video Source Switching ...

Page 21: ...Colour Television Chassis M123A 48 7 Electrical Diagrams 7 8 Side AV 7 Electrical Diagrams 7 9 Audio Amplifier ...

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