Toshiba 50A50 Service Manual Download Page 22

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MECHANICAL DISASSEMBLY

– 23 –

– 24 –

1 Speaker Grille Removal

2 Control Panel Removal

3 Front Mask Removal

5 Shield Plate, Lens Removal

6 Mirror Removal

7 Back Board Removal

8 Light Box Removal

A103

A102

A126
A127

A101

A213

A224

A221

(A322)

A202

A268

K501

(K511)

4 screws

A201

K502

K111
K112
K113

4 screws

A269

K601

5 screws

A152

A424

A160

3 screws

5 screws

A401

3 screws

(A150)

(A110)

1 screw

4 Mask Removal

A265

A266

A267

A201

Summary of Contents for 50A50

Page 1: ...FILE NO 020 200012 SERVICE MANUAL PUBLISHED IN JAPAN May 2000 S COLOR TELEVISION N0NSP Chassis 50A60 50A50 55A60 61A60 TAC0050 TAC0052 TAC0051 TAC0053 ...

Page 2: ... 8 SERVICE MODE 9 ELECTRICAL ADJUSTMENT 11 CONVERGENCE ADJUSTMENT 13 SCREEN AND MIRROR ALIGNMENTS 15 CIRCUIT CHECKS 16 CHAPTER 2 SPECIFIC INFORMATIONS SETTING ADJUSTING DATA 17 LOCATION OF CONTROLS 18 PROGRAMMING CHANNEL MEMORY 20 CIRCUIT BLOCK DIAGRAM 21 MECHANICAL DISASSEMBLY 23 CHASSIS REPLACEMENT PARTS LIST 25 PC BOARDS BOTTOM VIEW 41 TERMINAL VIEW OF TRANSISTORS 51 SPECIFICATIONS 53 APPENDIX ...

Page 3: ...ture tube away from the unprotected body while handling 3 When replacing a chassis in the cabinet always be cer tain that all the protective devices are put back in place such as non metallic control knobs insulating covers shields isolation resistor capacitor network etc 4 Before returning the set to the customer always perform an AC leakage current check on the exposed metallic parts of the cabi...

Page 4: ...SEALING OF CRT COOLANT Lens and Neck Components View Attention Serviceman The Hex Head Bolts with Springs see sketch used on CRT assembly are NOT Adjustment Screws DO NOT LOOSEN FLUID LEAKAGE WILL OCCUR 8 o clock 4 o clock 4 Screws CRT Anode Cap Assembly S V M Coil CRT DRIVE Board Lens Assembly CRT Assembly Deflection Yoke and Conver Yoke CRT Mounting 4 Screws R G B ...

Page 5: ...ILT ADJUSTMENT page 6 3 USER CONVERGENCE CENTER CHECK See owner s manual 4 CENTERING ADJUSTMENT page 6 5 CONVERGENCE ADJUSTMENT page 13 6 WHITE BALANCE ADJUSTMENT page 12 Adjustments are complete SERVICING PRECAUTIONS Check the point of anode lead in a straight line if it is winding please revise it Anode lead holder Do not use a magnetized screw driver for screws of Deflection Yoke and Velocity M...

Page 6: ...the neck is required most front CRT funnel side and the screw is fastened after rotating yoke adjusting picture tilt 2 Centering magnet After adjusting picture tilt picture position is finally fixed by this magnet In order to get maximum margin of user conver gence control for center of screen this magnet have to be used for center convergence adjust ment PREPARATION Operate the receiver for at le...

Page 7: ... 7 GENERAL ADJUSTMENTS SPECIFIC INFORMATIONS LOCATION OF SCREEN AND FOCUS VR S SCREEN VR FOCUS VR R G B ...

Page 8: ...R BOOT LEAD HOLDER Z450 TPA5007 Fig a 1 When replacing Anode Lead or Anode Cap with new one remove Lead Holder from old lead as shown in figure below and put it on new lead Do not throw away Lead Holder NOTE THE LEAD HOLDER IS ATTACHED TO TPA5007 Z450 BUT IS NOT ATTACHEDTO ANODE LEAD AND ANODE CAP RUBBER BOOT IS ATTACHEDTO ANODE LEAD AND ANODE CAP 2 Detaching Lead Holder RUBBER BOOT OLD ANODE LEAD...

Page 9: ...lay of adjustment menu provides special functions Screen adjustment mode ON OFF TV ANT VIDEO button on TV Selection of the adjustment items Channel s t on TV or Remote Change of the data value Volume s t on TV or Remote Adjustment menu mode ON OFF MENU button on TV Initialization of the memory QA02 RECALL Channel button on TV s Initialization of the self diagnostic data RECALL Channel button on TV...

Page 10: ...splay NG MAIN Main sync SUB Sub sync when turn on the PIP 4 SELECTING THE ADJUSTING ITEMS 1 Every pressing of CHANNEL s button in the service mode changes the adjustment items in the order of table 2 t button for reverse order Refer to table 2 for preset data of adjustment mode See SETTING ADJUSTING DATA on page 17 5 ADJUSTING THE DATA 1 Pressing of VOLUME s or t button will cahnge the value of da...

Page 11: ...hieve about 1V0 p of blue bar 6 Select TNTC register 7 Adjust the data value to obtain the blue bar to magenta bar ratio of 3 2 as shown 8 Select SCOL register 9 Adjust the data value to achieve 1 8V0 p of blue bar on scope 10 Check the picture with off air signal 0 Blue Magenta 2 3 1 8V0 P SUB CONTRAST SCNT 1 Tune in a color program and adjust the BRIGHTNESS and CONTRAST to normal mode RESET 2 En...

Page 12: ...gnal and adjust the contrast to the minimum to make white picture to low light 8 Adjust the data of items RCUT GCUT and BCUT for low light area 9 Adjust the contrast to the maximum to make white picture to high light 10 Adjust the data of items GDRV and BDRV Controls for proper white balanced picture in high light area 11 Check the white balance in both low and high light areas If necessary perfor...

Page 13: ...o select Green color to be adjusted 4 Press 5 button to stop the blinking of cursor 5 Press 2 up 8 down 4 left or 6 right to obtain the correct cross hatch pattern as above If necessary the specified color line can be erased from the screen 100 button to erase Red line 0 button to erase Green line RTN ENT button to erase Blue line 6 Press 5 button to make the cursor blinking 7 Press 2 8 4 6 button...

Page 14: ... green data 6 Adjust convergence of each screen picture for color matching Do not move green one at this time 7 After convergence adjustment of each screen picture finishes replace green CRT For green CRT as well repeat steps 2 to 5 above on bases of red and blue color matching to adjust convergence REPLACING CONVERGENCE UNIT When replacing convergence unit all picture screens require readjustment...

Page 15: ...ufac tured by Edmund Scientific Co etc HOW TO CLEAN SCREEN When cleaning the screen use a soft cloth so as not to damage the screen 1 Wipe the screen with a dry cloth to remove moisture on the screen Note Absolutely do not use detergent water alcohol benzine thinner etc for cleaning in order not to wipe away the black print on the surface ASSEMBLING OF FRONT SCREEN Fresnel sheet Protect shield FRO...

Page 16: ...n the receiver off and allow the FS circuit more than 5 seconds to reset Then turn the receiver on to produce a normal picture Location No Name Name T461 C447 C406 C407 Flyback Trans Capacitor Capacitor Capacitor TFB3078ZD 3900pF 3 1500pF 3 4700pF 3 ANODE VOLTAGE MEASURING METHOD CAUTION Take extra precaution when measuring this high voltage High voltages are also present in surrounding circuit bo...

Page 17: ...ECTION PICTURE WIDTH V SHIFT RCUT GCUT BCUT GDRV BDRV CNTX BRTC COLC TNTC SCOL SCNT HPOS VPOS HIT LIN VSC WID VPS Preset Date 40H 40H 40H 40H 40H 7FH 80H 50H 44H 05H 10H 19H 00H 64H 12H 10H 28H 18H 23H Table 2 CIRCUIT CHECKS Table 3 FBT DETECTION VOLTAGE C 24 5V Item Name of adjustment Preset Date VCP PARA CNR TRAP HCP VFC PHUE PCNT PCOL RGBB PROF PBOF PGOF STRH STRP VLD VCEN TVOP V COMPENSATE E W...

Page 18: ...r MENU Video Audio inputs CHANNEL st S VIDEO VIDEO L MONO AUDIO POWER MENU VOL VOL EXIT DEMO TV VIDEO CH CH R AUDIO CENTER CHANNEL IN ON OFF OUT R VIDEO S VIDEO ANT 1 OUT ANT 2 VIDEO L MONO R AUDIO MONO L AUDIO R L R AUDIO C Y C B R L VAR AUDIO ANT 75Ω VIDEO 2 VIDEO 1 OUT DVD IN IN COLOR STREAM INPUT TV VIDEO EXIT DEMO TV rear ...

Page 19: ...TILL LOCATE SWAP TV VCR REW FF STOP SOURCE FAV FAV C CAPT EXIT MENU RESET 1 4 7 2 5 8 3 6 9 0 100 ENTER Remote Control LIGHT TV CABLE VCR switch Set to TV to control the TV MUTE Channel Number C CAPT ENTER FAV t RESET PIP CH t RECALL POWER TIMER TV VIDEO CHANNEL s t VOLUME s t CH RTN PIP CH s FAV s EXIT MENU PIP functions For TV and CABLE modes s t T S ...

Page 20: ...will automatically cycle through all the TV or CABLE channels selected by the TV CABLE function and store active channels in the channel memory 3 When channel programming is complete you will see the message to the right appears 4 Press CHANNEL s or t to make sure the channel programming has been done properly ADD ERASE function After performing the CH PROGRAM function you can add or erase specifi...

Page 21: ...CIRCUIT BLOCK DIAGRAM 21 22 ...

Page 22: ...moval 6 Mirror Removal 7 Back Board Removal 8 Light Box Removal A103 A102 A126 A127 A101 A213 A224 A221 A322 A202 A268 K501 K511 4 screws A201 K502 K111 K112 K113 4 screws 4 screws A269 K601 5 screws A152 A424 A160 3 screws 5 screws A401 3 screws 3 screws 3 screws A150 A110 1 screw 4 Mask Removal A265 A266 A266 A267 A201 ...

Page 23: ...L 1 F 20 50V C205 24206229 EL 2 2 F 20 50V C206 24666100 EL 10 F 20 16V C207 24781390 Chip 39pF SL C208 24781390 Chip 39pF SL C209 24781390 Chip 39pF SL C212 24666100 EL 10 F 20 16V C213 24092616 Chip 0 33 F 10 16V C220 24709100 EL 10 F 20 200V C301 24815683 Chip 0 068 F 10 C302 24092463 Chip 0 22 F 10 16V C303 24666101 EL 100 F 20 16V C304 24092178 Chip 0 1 F 10 25V C305 24815103 Chip 0 01 F 10 C...

Page 24: ...7 F 20 50V C625 24206479 EL 4 7 F 20 50V C626 24206479 EL 4 7 F 20 50V C627 24206479 EL 4 7 F 20 50V C628 24206100 EL 10 F 20 50V C629 24206100 EL 10 F 20 50V C630 24206108 EL 0 1 F 20 50V C631 24814472 Chip 0 01 F 80 20 C632 24203470 EL 47 F 20 16V C633 24092178 Chip 0 1 F 10 25V C634 24206108 EL 0 1 F 20 50V C635 24206479 EL 4 7 F 20 50V C636 24206479 EL 4 7 F 20 50V C637 24206100 EL 10 F 20 50V...

Page 25: ... CD 0 01 F 10 500V C863 24567104 PF 0 1 F C864 24092474 CD 220pF 10 2kV C866 24567474 PF 0 47 F C867 24591682 PF 6800pF C868 24073052 EL 47 F 20 25V C869 24678229 EL 2 2 F 20 200V C870 24082890 PF 0 082 F 800V C871 24092484 CD 1500pF 10 2kV C872 24092474 CD 220pF 10 2kV C873 24567224 PF 0 22 F C874 24212471 CD 470pF 10 C876 24567474 PF 0 47 F C879 24073081 EL 1 0 F 20 50V C884 24086939 EL 330 F 20...

Page 26: ...3 24092178 Chip 0 1 F 10 25V CR14 24092178 Chip 0 1 F 10 25V CR15 24092178 Chip 0 1 F 10 25V CR16 24092178 Chip 0 1 F 10 25V CR17 24092178 Chip 0 1 F 10 25V CS03 24436221 CD 220pF CS04 24206010 EL 1 F 20 50V CS07 24436221 CD 220pF CS08 24206010 EL 1 F 20 50V CS09 24436331 CD 330pF CS10 24206229 EL 2 2 F 20 50V CS11 24206010 EL 1 F 20 50V CS12 24436221 CD 220pF CS13 24206010 EL 1 F 20 50V CS14 2443...

Page 27: ...TORS RESISTORS RESISTORS RESISTORS R101 24383223 OMF 22k ohm 2W R150 24872101 Chip 100 ohm 1 16W 50A60 55A60 61A60 R151 24872562 Chip 5600 ohm 1 16W 50A60 55A60 61A60 R152 24872103 Chip 10k ohm 1 16W 50A60 55A60 61A60 R201 24872821 Chip 820 ohm 1 16W R202 24872102 Chip 1k ohm 1 16W R204 24872104 Chip 100k ohm 1 16W R205 24872101 Chip 100 ohm 1 16W 50A60 55A60 61A60 R206 24872102 Chip 1k ohm 1 16W ...

Page 28: ...2 CC 1k ohm 1 2W R420 24382473 OMF 47k ohm 1W R421 24382104 OMF 100k ohm 1W 50A60 55A60 61A60 R423 24872471 Chip 470 ohm 1 16W R424 24338398 MF 0 39 ohm 1W R426 24000112 FR 10 ohm 1 4W R428 24310109 MF 1 0 ohm 1 2W R431 24383102 OMF 1k ohm 2W 50A60 55A60 61A60 R432 24376274 CF 270k ohm 1 2W 50A60 55A60 61A60 R432 24552101 OMF 100 ohm 1 2W R433 24376274 CF 270k ohm 1 2W 50A60 55A60 61A60 R433 24872...

Page 29: ...6W R702 24872221 Chip 220 ohm 1 16W R703 24872472 Chip 4700 ohm 1 16W R704 24872472 Chip 4700 ohm 1 16W R707 24872100 Chip 10 ohm 1 16W R708 24872100 Chip 10 ohm 1 16W R709 24872100 Chip 10 ohm 1 16W R710 24872100 Chip 10 ohm 1 16W R711 24872100 Chip 10 ohm 1 16W R712 24872100 Chip 10 ohm 1 16W R713 24872100 Chip 10 ohm 1 16W R714 24872100 Chip 10 ohm 1 16W R716 24872103 Chip 10k ohm 1 16W R718 24...

Page 30: ...hm R962 24366391 CF 390 ohm R963 24366222 CF 2200 ohm R964 24366332 CF 3300 ohm R965 24366471 CF 470 ohm R966 24366821 CF 820 ohm R967 24366122 CF 1200 ohm R968 24366680 CF 68 ohm R969 24366103 CF 10k ohm R970 24366222 CF 2200 ohm R971 24367152 CF 1500 ohm 2 R972 24367471 CF 470 ohm 2 R973 24367681 CF 680 ohm 2 R974 24367681 CF 680 ohm 2 R975 24366242 CF 2400 ohm R976 24367562 CF 5600 ohm 2 R977 2...

Page 31: ...4872103 Chip 10k ohm 1 16W RA78 24366273 CF 27k ohm RA78 24872333 Chip 33k ohm 1 16W RA79 24366823 CF 82k ohm RA79 24872333 Chip 33k ohm 1 16W RA80 24872101 Chip 100 ohm 1 16W RB01 24366271 CF 270 ohm RB03 24872101 Chip 100 ohm 1 16W RB04 24366103 CF 10k ohm RB14 24872153 Chip 15k ohm 1 16W RB15 24366471 CF 470 ohm RB15 24872153 Chip 15k ohm 1 16W RB16 24872332 Chip 3300 ohm 1 16W RB17 24872332 Ch...

Page 32: ...180 ohm 1 2W RV89 24366750 CF 75 ohm RV90 24366103 CF 10k ohm RV91 24366302 CF 3k ohm RV92 24366103 CF 10k ohm RV93 24366103 CF 10k ohm RV94 24366392 CF 3900 ohm RV95 24366123 CF 12k ohm RV96 24366274 CF 270k ohm RV97 24366331 CF 330 ohm RV98 24366472 CF 4700 ohm RW02 24366821 CF 820 ohm RW09 24366563 CF 56k ohm RW10 24872102 Chip 1k ohm 1 16W RW13 24366393 CF 39k ohm RW14 24552121 OMF 120 ohm 1 2...

Page 33: ...Coil Peaking TRF4222 L722 23289102 Coil Peaking TRF4102AJ L723 23237805 Coil Peaking TRF4222 L724 23289102 Coil Peaking TRF4102AJ L725 23237805 Coil Peaking TRF4222 L726 23289102 Coil Peaking TRF4102AJ L727 23237805 Coil Peaking TRF4222 L728 23289102 Coil Peaking TRF4102AJ L729 23237805 Coil Peaking TRF4222 L730 23289102 Coil Peaking TRF4102AJ L731 23237805 Coil Peaking TRF4222 L737 23289560 Coil ...

Page 34: ...A1266 Y Q409 23314965 Transistor KTC3198 Y Q430 23314965 Transistor KTC3198 Y Q481 B0347235 IC TA75339AP Q492 A6547305 Transistor 2SA1321 FA C Q501 B0385677 IC TA1222BN Q502 A6335470 Transistor 2SC2712 Y Q503 A6541130 Transistor 2SA1162 Y Q520 A6541130 Transistor 2SA1162 Y Q521 A6541130 Transistor 2SA1162 Y Q522 A6541130 Transistor 2SA1162 Y Q523 A6335470 Transistor 2SC2712 Y Q524 A6004010 Transis...

Page 35: ... QW19 A6317440 Transistor 2SC1815 Y QW20 A6317440 Transistor 2SC1815 Y QW52 23114528 Transistor 2SC1740S Q QW53 23114528 Transistor 2SC1740S Q QW54 23114528 Transistor 2SC1740S Q QW60 23114530 Transistor 2SA933S Q QW68 23114528 Transistor 2SC1740S Q QY26 23114528 Transistor 2SC1740S Q QZ01 B0410895 IC TC90A49P QZ02 A6541130 Transistor 2SA1162 Y QZ03 A6541130 Transistor 2SA1162 Y QZ04 A6541130 Tran...

Page 36: ...A45 23118041 Diode MA111 TX DA46 23118041 Diode MA111 TX DB01 23358501 Diode LED SCL003URC5F DB13 23358522 Diode LED SIR 56SB3F DB30 23118859 Diode 1SS133 DV01 23316686 Diode Zener MTZJ9 1A DV02 23316686 Diode Zener MTZJ9 1A DV03 23316686 Diode Zener MTZJ9 1A DV07 23316686 Diode Zener MTZJ9 1A DV08 23316686 Diode Zener MTZJ9 1A DV09 23316686 Diode Zener MTZJ9 1A DV11 23316686 Diode Zener MTZJ9 1A ...

Page 37: ...7D Z712 23103823 Filter TEM2027D ZT01 70108925 Resonator 4MHz TCR1071 PC BOARD ASSEMBLIES PC BOARD ASSEMBLIES PC BOARD ASSEMBLIES PC BOARD ASSEMBLIES PC BOARD ASSEMBLIES E031Z CRT D R Board PB9454A1 50A60 55A60 61A60 E031Z CRT D R Board PB9454B1 50A50 E032Z CRT D G Board PB9454A2 50A60 55A60 61A60 E032Z CRT D G Board PB9454B2 50A50 E033Z CRT D B Board PB9454A3 50A60 55A60 61A60 E033Z CRT D B Board...

Page 38: ...60 A401 23005247 Back Cover 61A60 A424 23540074 Back Cover 50A60 50A50 A424 23540075 Back Cover 55A60 A424 23540076 Back Cover 61A60 A505 72471068 Screw BIDT2 4X12BZ A510 23030815 Screw PTD 6 X 3 4 A518 23030815 Screw PTD 6 X 3 4 A519 23030815 Screw PTD 6 X 3 4 A521 23030815 Screw PTD 6 X 3 4 A533 23030815 Screw PTD 6 X 3 4 A535 23030815 Screw PTD 6 X 3 4 A539 23030815 Screw PTD 6 X 3 4 A541 23030...

Page 39: ... 41 42 SIGNAL CON BOARD PB9450 BOTTOM FOIL SIDE ...

Page 40: ... 43 44 DEF POWER BOARD PB9451 BOTTOM FOIL SIDE ...

Page 41: ... 45 GENERAL ADJUSTMENTS SPECIFIC INFORMATIONS BACK AV BOARD PB9452 BOTTOM FOIL SIDE ...

Page 42: ... 46 GENERAL ADJUSTMENTS SPECIFIC INFORMATIONS DIGI CONV BOARD PB9453 BOTTOM FOIL SIDE DIGI COMB BOARD PB9398 BOTTOM FOIL SIDE ...

Page 43: ... 47 GENERAL ADJUSTMENTS SPECIFIC INFORMATIONS R DRIVE BOARD PB9454 1 BOTTOM FOIL SIDE B DRIVE BOARD PB9454 3 BOTTOM FOIL SIDE ...

Page 44: ... 48 GENERAL ADJUSTMENTS SPECIFIC INFORMATIONS B DRIVE BOARD PB9454 2 BOTTOM FOIL SIDE FRONT CONT BOARD PB9454 4 BOTTOM FOIL SIDE ...

Page 45: ... 49 GENERAL ADJUSTMENTS SPECIFIC INFORMATIONS FRONT CONV BOARD PB9454 5 BOTTOM FOIL SIDE FRONT IN BOARD PB9454 9 BOTTOM FOIL SIDE REM BOARD PB9454 10 BOTTOM FOIL SIDE ...

Page 46: ... 50 GENERAL ADJUSTMENTS SPECIFIC INFORMATIONS SVM BOARD PB9454 6 BOTTOM FOIL SIDE FRONT CON BOARD PB9454 8 BOTTOM FOIL SIDE ...

Page 47: ... 2SC1569 2SC4544 2SA1788 2SA1306 2SA1186A 3 2SC752GTM 2SC2482 2SC2655 2SC4721P 4 2SC752 2SA562TM 2SA1015 2SC1815 2SC2878 2SC1740S 2SC2120 2SA9335 5 2SA1788 6 RN2203 RN2201 RN2004 RN1203 RN1204 RN2204 RN1205 RN1202 RN1201 7 2SD1554 2SD2253 2SD1556 2SD2553 2SC5143 E C B B C E BCE B CE B C E E C B E C B 8 ON4409 B C E ...

Page 48: ... 52 GENERAL ADJUSTMENTS SPECIFIC INFORMATIONS MEMO ...

Page 49: ...rst signal 75 ohm VIDEO AUDIO INPUT VIDEO 1 V p p 75 ohm negative sync AUDIO 150 mV rms 30 modulation equivalent 47 kohm ColorStreamTM Color Difference VIDEO AUDIO INPUT Y INPUT 1 V p p 75 ohm Cr INPUT 0 7 V p p 75 ohm Cb INPUT 0 7 V p p 75 ohm AUDIO 150mV rms 47 kohm VIDEO AUDIO OUTPUT VIDEO 1 V p p 75 ohm negative sync AUDIO 150 mV rms 30 modulation equivalent 4 7 kohm VARIABLE AUDIO OUTPUT 0 30...

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