Panasonic TX-25FG20R Service Manual Download Page 4 | Manualshive

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Panasonic TX-25FG20R Service Manual Download Page 4

1.5. GP4 Block Diagram

I

INPUT

ID1

ID2

AV

1

YUV

AV

2

AV

–

3

1

4

S-VHS

TUNER

VM

R

G

B

GP4

coil

defl.

VIDEO

SWITCH

IC604

IF

MONITOR

OUT

IC801

T801

IC857

3.3V

IC855

3.3V & 1.8V

EEPROM

IC1101

AUDIO

AMP

IC2301

GEOMAGNETIC

V OUT

IC601

VCT-IF

SAW

AV1

AV2

AV3

AV4

AUDIO

SWITCH

IC2320/1

Y

U

V

AV1 Y/C

Y/C

YUV3

YUV4

Y

U

V

IF

H OUT

WOOFER

AMP

IC2302

SPEAKER

V

H

R

G

B

VM

SDA SCL

PRIMARY

LIFE CCT

WOOFER

EW

EW

AV1

AV2

WOOFER

IC851

5V & 8V

+B 140V

SOUND 15V

Antenna

CRT

L

R

4

TX-25FG20R

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Summary of Contents for TX-25FG20R

Page 1: ...trial Co Ltd All rights reserved Unauthorized copying and distribution is a violation of law TX 25FG20R GP4 Chassis Video 31 5 MHz D K 32 5 MHz B G 32 0 MHz I 32 5 MHz M Sound 33 57 MHz PAL Colour 33 6 MHz SECAM 34 42 MHz NTSC 33 75 MHz SECAM Receiving Stereo Sound System AV STEREO Video Audio Terminals AV 1 2 3 Y PB PR Phone Type Y 1 0Vp p 75Ω PB PR 0 7Vp p 75Ω Video 1 0Vp p 75Ω Audio Approx 400m...

Page 2: ...unction 6 3 4 Service Mode 2 Controls OPTION data 1 3 6 4 Adjustment Procedure 7 4 1 Adjustment Procedure 7 4 2 COLOUR PURITY 7 4 3 CONVERGENCE 8 4 4 WHITE BALANCE MARKET MODE CHK 4 9 4 5 ADJUSTMENT OF CRT VRS 10 5 Conductor Views 11 5 1 D Board 1 2 11 5 2 D Board 2 2 12 6 Schematic Diagrams 13 6 1 SCHEMATIC DIAGRAM FOR GP4 CHASSIS 13 6 2 D Board 15 6 3 G Board 20 6 4 L Board 24 7 Parts Locations ...

Page 3: ...c When the exposed metallic part has a return path to the chassis the reading should be between 4 MΩ Ω Ω Ω and 20 MΩ Ω Ω Ω When the exposed metal does not have a return path to the chassis the reading must be zero 1 3 Leakage Current Hot Check See Fig 1 1 Plug the AC cord directly into the AC outlet Do not use an isolation transformer for this check 2 Connect a 2 kΩ 10 W resistor in series with an...

Page 4: ...C801 T801 IC857 3 3V IC855 3 3V 1 8V EEPROM IC1101 AUDIO AMP IC2301 GEOMAGNETIC V OUT IC601 VCT IF SAW AV1 AV2 AV3 AV4 AUDIO SWITCH IC2320 1 Y U V AV1 Y C Y C YUV3 YUV4 Y U V IF H OUT WOOFER AMP IC2302 SPEAKER V H R G B VM SDA SCL PRIMARY LIFE CCT WOOFER EW EW AV1 AV2 WOOFER IC851 5V 8V B 140V SOUND 15V Antenna CRT L R 4 TX 25FG20R ...

Page 5: ...2 Service Hints 2 1 HOW TO MOVE CHASSIS INTO SERVICE POSITION 1 Remove 9 screws 2 Draw out Main Chassis 3 Stand the Main Chassis 5 TX 25FG20R ...

Page 6: ... of selected item 5 Volume decrement of selected item 6 OK remote store save selected item 7 Normal remote exit service mode 11 ANGEL 128 127 12 BOW 128 127 13 DVCO 128 127 14 R CUT OFF 128 127 15 G CUT OFF N A 16 B CUT OFF 0 511 17 R DRIVE 0 511 18 G DRIVE 0 511 19 B DRIVE 0 511 20 SUB Bright 128 127 6 OK remote store save selected item 7 Normal remote exit service mode NOTE Service mode 2 option...

Page 7: ...rgence magnets 5 Apply a green pattern signal 4 1 3 High Voltage Item preparation 1 Receive the crosshatch pattern 2 Set to 0 Beam Screen VR minimum Contrast minimum Adjustment Procedure 1 Connect a DC voltage meter to D866 and confirm the B voltage is 141 0 1 5V 2 Connect a high frequency voltmeter to heater and confirm that voltage reads 6 3 0 28 VRMS 3 Normalize the brightness and contrast 4 1 ...

Page 8: ...rol to the maximum position 2 Adjust Bright control to obtain a clear pattern 3 Adjust Red and Blue line at center of the screen 4 Adjust Red and Blue with Green line at center of the screen by rotating RB G static convergence magnet 5 Lock convergence magnets with silicone sealer 6 Remove the DY wedges and slightly tilt the Deflection Yoke vertically 7 Fix the Deflection Yoke by re inserting the ...

Page 9: ...adjust the G CUTOFF setting in the following procedure 4 Adjust the remaining R and B CUTOFF controls so as to get a white horizontal line on the screen 5 Return to full field SCAN by pushing the position 5 key on the remote control 6 Adjust the R Drive and B Drive controls as to obtain a uniform white on the white bar of the greyscale pattern 7 Confirm correct B W rendition and greyscale tracking...

Page 10: ...magnets are top position VRS Mag Set VRS Mg that 2 magnets are horizontal position only 21 25 29 3 Set geomagnetic corection DAC AS IN TABLE 1 ADJUSTMENT 1 Receive the white balance pattern 2 Adjust V CENTER 3 Set R B CUT OFF to minimum and set G CUT OFF to center 4 Receive the aging pattern 5 Set 2 magnet of vertical position to up and down equally so that center part of CRT Fig 4 10 TX 25FG20R ...

Page 11: ...5 Conductor Views 5 1 D Board 1 2 11 TX 25FG20R ...

Page 12: ...5 2 D Board 2 2 12 TX 25FG20R ...

Page 13: ...6 Schematic Diagrams 6 1 SCHEMATIC DIAGRAM FOR GP4 CHASSIS 13 TX 25FG20R ...

Page 14: ...14 TX 25FG20R ...

Page 15: ...6 2 D Board 6 2 1 D Board 1 5 A1 A2 A3 A4 A5 A6 15 TX 25FG20R ...

Page 16: ...6 2 2 D Board 2 5 B1 B2 B3 B4 B5 B6 A1 A2 A3 A4 A5 A6 16 TX 25FG20R ...

Page 17: ...6 2 3 D Board 3 5 C1 C2 C3 C4 C5 B1 B2 B3 B4 B5 B6 17 TX 25FG20R ...

Page 18: ...6 2 4 D Board 4 5 D1 D2 D3 D4 D5 D6 C1 C2 C3 C4 C5 18 TX 25FG20R ...

Page 19: ...6 2 5 D Board 5 5 D1 D2 D3 D4 D5 D6 19 TX 25FG20R ...

Page 20: ...6 3 G Board 6 3 1 G Board 1 4 A1 A2 A3 A4 A5 A6 20 TX 25FG20R ...

Page 21: ...6 3 2 G Board 2 4 B1 B2 B3 B4 B5 B6 A1 A2 A3 A4 A5 A6 21 TX 25FG20R ...

Page 22: ...6 3 3 G Board 3 4 C1 C2 C3 C4 B1 B2 B3 B4 B5 B6 22 TX 25FG20R ...

Page 23: ...6 3 4 G Board 4 4 C1 C2 C3 C4 23 TX 25FG20R ...

Page 24: ...6 4 L Board 6 4 1 L Board 1 3 A1 A2 A3 A4 A5 A6 24 TX 25FG20R ...

Page 25: ...6 4 2 L Board 2 3 B1 B2 B3 B4 B5 B6 A1 A2 A3 A4 A5 A6 25 TX 25FG20R ...

Page 26: ...6 4 3 L Board 3 3 B1 B2 B3 B4 B5 B6 26 TX 25FG20R ...

Page 27: ...7 Parts Locations 27 TX 25FG20R ...

Page 28: ...8 1 Replacement Parts List Notes 8 Replacement Parts List 28 TX 25FG20R ...

Page 29: ...rks C2317 F1J1H104A578 C 0 1UF 50V C2319 F1J1H104A578 C 0 1UF 50V C2320 ECJ2VC1H102J C 1000PF J 50V C2321 ECJ2VC1H102J C 1000PF J 50V C2322 ECJ2VC1H102J C 1000PF J 50V C2334 ECEA1HN2R2U E 2 2UF 50V C2335 ECEA1HN2R2U E 2 2UF 50V C253 ECEA1HN2R2U E 2 2UF 50V C254 ECJ2VB1H102J C 1000PF 50V C257 ECEA1HN2R2U E 2 2UF 50V C258 ECJ2VB1H102J C 1000PF 50V C3001 ECJ2VF1H103Z C 0 01UF Z 50V C3005 F1J1H222A721...

Page 30: ...CJ2VF1E104Z C 0 1UF Z 25V C704 L6Y5P4B122K C 1200PF K 500V C706 ECQB1H222JF P 2200PF J 50V C806 ECKWAE472ZED C 4700PF Z 500V C807 ECKWAE472ZED C 4700PF Z 500V Ref No Part No Part Name Description Remarks C808 ECKWAE472ZED C 4700PF Z 500V C809 ECKWAE472ZED C 4700PF Z 500V C810 EC0S2GB471EB E 470UF 400V C811 ECQM4473JZ P 0 047UF J 400V C815 ECKW3D151KBR C 150PF 2kV C816 ECA1HHG100 E 10UF 50V C819 EC...

Page 31: ...38 BEAD CORE L2302 J0JKA0000038 BEAD CORE L2304 J0JKA0000038 BEAD CORE L2306 J0JKA0000038 BEAD CORE L2307 EXCELSA35V COIL L2323 J0JKA0000038 BEAD CORE L2324 J0JKA0000038 BEAD CORE L300 TALV35VB8R2K PEAKING COIL L3001 J0JKB0000034 EMI FILTER L301 G0C4R7KA0065 PEAKING COIL L3030 G0C100JA0055 PEAKING COIL L3142 G0C6R8JA0021 COIL L3143 G0C6R8JA0021 COIL L3150 J0JKB0000034 EMI FILTER L376 J0JKB0000038 ...

Page 32: ...No Part Name Description Remarks R1203 ERJ6GEY0R00 M 0OHM J 1 10W R1204 ERJ6GEY0R00 M 0OHM J 1 10W R1228 ERJ6GEYJ220 M 22OHM J 1 10W R1229 ERJ6GEYJ220 M 22OHM J 1 10W R2110 ERJ6GEY0R00 M 0OHM J 1 10W R2112 ERJ6GEYJ102 M 1KOHM J 1 10W R2113 ERJ6GEYJ562 M 5 6KOHM J 1 10W R2302 ERX2FJSR22E M 0 22OHM J 2W R2304 ERJ6GEYJ471 M 470OHM J 1 10W R2305 ERJ6GEYJ102 M 1KOHM J 1 10W R2306 ERJ6GEYJ102 M 1KOHM J ...

Page 33: ...2W R559 ERQ1CJP1R2S F 1 2OHM J 1W R580 ERJ6GEYJ392 M 3 9KOHM J 1 10W R581 ERJ6GEYJ563 M 56KOHM J 1 10W Ref No Part No Part Name Description Remarks R602 ERJ6GEYJ103 M 10KOHM J 1 10W R603 ERJ6GEYJ471 M 470OHM J 1 10W R606 ERJ6GEYJ752 M 7 5KOHM J 1 10W R607 ERJ6GEYJ752 M 7 5KOHM J 1 10W R609 ERJ6GEYJ102 M 1KOHM J 1 10W R610 ERJ6GEYJ101 M 100OHM J 1 10W R611 ERJ6GEYJ101 M 100OHM J 1 10W R612 ERJ6GEY0...

Page 34: ...5 ERJ6GEY0R00 M 0OHM J 1 10W JA16 ERJ6GEY0R00 M 0OHM J 1 10W JA17 ERJ6GEY0R00 M 0OHM J 1 10W JA18 ERJ6GEY0R00 M 0OHM J 1 10W Ref No Part No Part Name Description Remarks JA19 ERJ6GEY0R00 M 0OHM J 1 10W JA2 ERJ6GEY0R00 M 0OHM J 1 10W JA20 ERJ6GEY0R00 M 0OHM J 1 10W JA21 ERJ6GEY0R00 M 0OHM J 1 10W JA22 ERJ6GEY0R00 M 0OHM J 1 10W JA23 ERJ6GEY0R00 M 0OHM J 1 10W JA24 ERJ6GEY0R00 M 0OHM J 1 10W JA25 ER...

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