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Toshiba 43H72 Service Manual

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FILE NO. 020-200203

SERVICE MANUAL

COLOR TELEVISION
N2PSP Chassis
43H72, 50H72
(TAC0261)
(TAC0262)
PUBLISHED IN JAPAN, Apr. 2002 So

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  • Page 1: Service Manual

    FILE NO. 020-200203 SERVICE MANUAL COLOR TELEVISION N2PSP Chassis 43H72, 50H72 (TAC0261) (TAC0262) PUBLISHED IN JAPAN, Apr. 2002 So...
  • Page 2: Table Of Contents

    TABLE OF CONTENTS CHAPTER 1 GENERAL ADJUSTMENTS SAFETY INSTRUCTIONS .............................. 3 CRT ASSEMBLY REPLACEMENT AND MOUNTING ....................4 PICTURE TUBE COMPONENTS ADJUSTMENT ......................6 REPLACEMENT OF THE CRT ............................8 SERVICE MODE ................................9 ELECTRICAL ADJUSTMENT ............................11 CONVERGENCE ADJUSTMENT ..........................13 SCREEN AND MIRROR ALIGNMENTS ........................
  • Page 3: Chapter 1 General Adjustments

    CHAPTER 1 GENERAL ADJUSTMENTS SAFETY INSTRUCTIONS WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRECAU- TION” AND “PRODUCT SAFETY NOTICE” INSTRUCTIONS BELOW. X-RAY RADIATION PRECAUTION 1. Excessive high voltage can produce potentially hazardous 2. This receiver is equipped with a Fail Safe (FS) circuit which X-RAY RADIATION.
  • Page 4: Crt Assembly Replacement And Mounting

    CRT ASSEMBLY REPLACEMENT AND MOUNTING CAUTION : DO NOT LOOSEN THE HEX HEAD BOLTS WITH SPRINGS (12 PCS), BECAUSE THOSE ARE FOR SEALING OF CRT COOLANT. Attention Serviceman The Hex Head Bolts with Springs. (see sketch) used on CRT assembly, 8 o’clock are “NOT”...
  • Page 5: Servicing Precautions

    TO REMOVE CRT (Same procedure for R, G, B) 1. Remove CRT DRIVE Board, S. V. M. COIL and DEF. YOKE from CRT. 2. Remove Lens Assembly. 3. Detach CRT Anode Cap from CRT. 4. Remove CRT Assembly from CRT Mounting. Anode Cap CRT REPLACEMENT (Same procedure for R, G, B) Reverse the removal procedures except the followings.
  • Page 6: Picture Tube Components Adjustment

    WARNING : BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRE- CAUTION” AND “PRODUCT SAFETY NOTICE” ON PAGE 3 OF THIS MANUAL. PICTURE TUBE COMPONENTS ADJUSTMENT DESCRIPTION OF NECK COMPONENTS TILT ADJUSTMENT Rotate R, G, B deflection yoke so that picture becomes hori- zon, then fasten screw.
  • Page 7 LOCATION OF SCREEN AND FOCUS VR’S SCREEN VR FOCUS VR – 7 –...
  • Page 8: Replacement Of The Crt

    REPLACEMENT OF THE CRT Service parts are provided for each R, G and B. The contents of the parts are as follows. HITACHI 23008174 23008175 23008176 REPLACEMENT OF HIGH VOLTAGE CABLE 1. When replacing Anode Lead or Anode Cap with new one, remove Lead Holder from old lead as shown in figure ANODE LEAD below, and put it on new lead.
  • Page 9: Service Mode

    SERVICE MODE 1. ENTERING TO SERVICE MODE 1) Press MUTE button twice 2) Press MUTE button 3) While pressing the MUTE button, on Remote Control. again to keep pressing. press MENU button on TV set. MUTE (Service mode display) 2. DISPLAYING THE ADJUSTMENT MENU 1) Press MENU button on TV.
  • Page 10 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 18) 5.
  • Page 11: Electrical Adjustment

    ELECTRICAL ADJUSTMENT ITEM ADJUSTMENT PROCEDURE ƒH 1. Receive NTSC signal. (free-running fre- 2. Short the terminal “TP +9V ” and the terminal “ TP (Free run) ” on the signal board with a jumper quency of Hor. wire. oscillator) 3. Connect the probe of frequency counter to the lead of R426 and GND. 4.
  • Page 12 ITEM ADJUSTMENT PROCEDURE HEIGHT 1. Receive NTSC signal. (HIT) 2. Call up the adjustment mode display and select the item HIT. 3. Press the VOLUME s or t button to get the picture so that top and bottom of video signal begin to lack. 4.
  • Page 13: Convergence Adjustment

    CONVERGENCE ADJUSTMENT Adjust convergence from center to circumference in order. 1. Select the adjustment mode following the steps on page KEY FUNCTION IN THE CONVERGENCE ADJUSTMENT: RCUT Lord BACK UP DATA: 1 button Up : 2 button Selet Green color: 3 button Left : 4 button...
  • Page 14 • Adjust right and left 5.5 horizontal lines of RETMA signal for picture screen size after adjustment. • On one vertical side, the ellipse encircling a tiger mark should contact the upper limit of screen and the 12th line should be visible at the screen bottom. NET GEOMETRY SCREEN SIZE 43H72 (874 655) 50H72 (1014 760) 317.6 368.8...
  • Page 15 NOTES In many cases, color misconvergence may be corrected by returning HIT and WID data in main deflection side to initial adjusting values. Following cases will surely require readjustment of convergence. CRT REPLACEMENT When CRT is replaced, main deflection readjustment and color matching are required. Perform following procedures.
  • Page 16: Screen And Mirror Alignments

    SCREEN AND MIRROR ALIGNMENTS ASSEMBLING OF FRONT SCREEN MOUNTING OF FRONT SCREEN INSIDE 0 to 1 mm OUT SIDE K503 FRONT PANEL K501 K502 LENTICULAR FRESNAL <INSIDE> SMOOTH LENS FRESNEL LENTICULAR FRONT PANEL BLACK STRIPES <OUTSIDE> BLACK STRIPES SMOOTH BEZEL SPACER FRONT PANEL LENTICULAR...
  • Page 17: Circuit Checks

    CIRCUIT CHECKS HIGH VOLTAGE CHECK FS CIRCUIT CHECK CAUTION: There is no HIGH VOLTAGE ADJUSTMENT on The Fail Safe (FS) circuit check is indispensable for the final this chassis. Checking should be done following check in servicing. Checking should be done following the the steps below.
  • Page 18: Chapter 2 Specific Informations

    CHAPTER 2 SPECIFIC INFORMATIONS SETTING & ADJUSTING DATA SAFETY INSTRUCTIONS 50" 43" HIGH VOLTAGE AT ZERO BEAM: 31.0 kV 31.0 kV MAX HIGH VOLTAGE: 32.5 kV 32.5 kV Table-1 SERVICE MODE ADJUSTING ITEMS AND DATA IN THE SERVICE MODE: Item Name of adjustment Preset Data...
  • Page 19: Location Of Controls

    LOCATION OF CONTROLS (Representative : 50H72) TV front Remote sensor (Behind the screen) Behind the door Power Indicator T Sst MENU EXIT TV/VIDEO DEMO POWER Video Audio inputs TV/VIDEO POWER VOLUMET S (Video3) CHANNEL st DEMO MENU EXIT TV rear AUDIO CENTER CHANNEL IN ANT (75Ω)
  • Page 20: Remote Control

    Remote Control RECALL LIGHT RECALL POWER LIGHT POWER TV/CABLE/VCR switch MUTE TV/VIDEO TIMER CABLE Set to “TV” to control the TV. TIMER MUTE TV/VIDEO CHANNEL s/t Channel Number VOLUME s/t CH RTN CH RTN FAVORITE ADV/ PIC SIZE PIP CH ENTER PIP CH s MENU/...
  • Page 21: Programming Channel Memory

    PROGRAMMING CHANNEL MEMORY The channel memory is the list of TV channel numbers the TV tunes in when you press the CHANNEL s or t button. First, use the TV/CABLE and CH PROGRAM functions to preset all active channels in your area automatically. If necessary, arrange the preset channels with the ADD/ERASE functions so that you can tune into only desired channels.
  • Page 22: Mechanical Disassembly

    MECHANICAL DISASSEMBLY (for 43") K502 20 SCREWS K601 K501 LABELS K503 SCREWS 9 SCREWS A420 A421 (A424) 11 SCREWS SCREWS A201 A001 A213 (A214) (A224) SCREWS A202 A268 SCREWS 6 SCREWS A102 K111 K112 K113 – 22 –...
  • Page 23 MECHANICAL DISASSEMBLY (for 50") 1 Speaker Grille Removal 2 Control Panel Removal 3 Front Mask Removal 4 Mask Removal A001 (A101) A201 A202 (A212) A201 A213 (A214) A224 K502 A268 K503 K501 A102 (K511) A102 4 screws 5 Shield Plate, Lens Removal 6 Mirror Removal 7 Back Board Removal 8 Light Box Removal...
  • Page 24 THIS PAGE IS INTENTIONALLY LEFT BLANK. – 25 – – 26 –...
  • Page 25: Chassis Replacement Parts List

    • The part number must be used when ordering parts, in order to assist in processing, be sure to include the Model number and Description. • The PC board assembly with mark is no longer available after the end of the production. Models : 50H72/43H72 Capacitors ..... CD Ceramic Disk : Plastic Film : Electrolytic Resistors ....
  • Page 26 Location Location Location Location Location Location Location Location Location Location Parts No. Parts No. Description Description Parts No. Parts No. Description Description Parts No. Parts No. Parts No. Description Description Description Parts No. Parts No. Parts No. Description Description Description C423 24211222 CERAMIC DISC, 2KV B 2200PFK...
  • Page 27 C7741 24105331 CERAMIC CHIP, 50V CH 330PF J C890 24073095 ELECTROLYTIC, 50V 2200UF M 3A C7755 24667101 ELECTROLYTIC, 25V 100UF M 3A (43H72) C894 24073058 ELECTROLYTIC CE04P 25V 2200UF M 3A C7757 24503047 PLASTIC FILM, 63V 0.33UF J (43H72) C895...
  • Page 28 Location Location Location Location Location Location Location Location Location Location Parts No. Parts No. Parts No. Parts No. Parts No. Description Description Description Description Description Parts No. Parts No. Parts No. Parts No. Parts No. Description Description Description Description Description C7794 24503041 PLASTIC FILM , 63V 0.1UF J...
  • Page 29 CH250 24092730 CERAMIC CHIP, 16V B 0.1UF K CH622 24590222 PLASTIC FILM, 50V 2200PF J CH301 24109472 CERAMIC CHIP, 50V B 4700PF K (43H72) CH623 24100103 CERAMIC CHIP, 50V F 10000PF Z CH302 24100104 CERAMIC CHIP, 25V F 100000PF Z (43H72)
  • Page 30 Location Location Location Location Location Location Location Location Location Location Parts No. Parts No. Parts No. Parts No. Parts No. Description Description Description Description Description Parts No. Parts No. Parts No. Parts No. Parts No. Description Description Description Description Description CS15 24436331 CERAMIC DISC, 50V SL 330PF J...
  • Page 31 FUSIBLE, 2W 330 OHM J R527 24011101 CHIP, METAL FILM, 1/20W 100 OHM J R416 24383680 OXIDE METAL FILM, 2W 68 OHM J (43H72) R530 24011101 CHIP, METAL FILM, 1/20W 100 OHM J R417 24366101 CARBON FILM, 1/6W 100 OHM J...
  • Page 32 OXIDE METAL FILM, 1/2W 10 OHM J R611 24011332 CHIP, METAL FILM, 1/20W 3.3K OHM J R766 24366470 CARBON FILM, 1/6W 47 OHM J (43H72) R767 24552221 OXIDE METAL FILM, 1/2W 220 OHM J R611 24011392 CHIP, METAL FILM, 1/20W 3.9K OHM J...
  • Page 33 Location Location Location Location Location Location Location Location Location Location Parts No. Parts No. Parts No. Parts No. Parts No. Description Description Description Description Description Parts No. Parts No. Parts No. Parts No. Parts No. Description Description Description Description Description R869 24366100 CARBON FILM, 1/6W 10 OHM J...
  • Page 34 Location Location Location Location Location Location Location Location Location Location Parts No. Parts No. Description Description Parts No. Parts No. Description Description Parts No. Parts No. Parts No. Description Description Description Parts No. Parts No. Parts No. Description Description Description R4533 24011331 CHIP, METAL FILM, 1/20W 330 OHM J...
  • Page 35 Location Location Location Location Location Location Location Location Location Location Parts No. Parts No. Parts No. Parts No. Parts No. Description Description Description Description Description Parts No. Parts No. Parts No. Parts No. Parts No. Description Description Description Description Description R9708 24366821 CARBON FILM, 1/6W 820 OHM J...
  • Page 36 CHIP, METAL FILM, 1/20W 1K OHM J RH212 24011473 CHIP, METAL FILM, 1/20W 47K OHM J (43H72) RH301 24011684 METAL FILM CHIP 1/20W 680K J (43H72) RH406 24011473 CHIP, METAL FILM, 1/20W 47K OHM J RH302 24011102 CHIP, METAL FILM, 1/20W 1K OHM J...
  • Page 37 Description Description RH421 24011681 CHIP, METAL FILM, 1/20W 680 OHM J RH648 24998103 CHIP, 1/16W 10K OHM (43H72) RH649 24011911 METAL FILM CHIP 1/20W 910 J RH422 24011102 CHIP, METAL FILM, 1/20W 1K OHM J RH661 24011911 METAL FILM CHIP 1/20W 910 J...
  • Page 38 RV67 24366750 CARBON FILM, 1/6W 75 OHM J L407 23248259 COIL, CHOKE 12X18H 6.8MMH, TLN3505AF RV74 24366750 CARBON FILM, 1/6W 75 OHM J (43H72) RV81 24366472 CARBON FILM, 1/6W 4.7K OHM J L410 23289120 COIL, PEAKING, TRF4120AF RV83 24366332 CARBON FILM, 1/6W 3.3K OHM J...
  • Page 39 FILTER, TEM2103T Q402 23314962 TRANSISTOR, KTA1266 Y LH126 23103864 FILTER, TEM2103T Q403 23314965 TRANSISTOR, KTC3198 Y LH301 23103859 COIL, CHOKE, TEM2011 (43H72) Q404 23205149 TRANSISTOR, 2SC5859(FA) LH302 23103859 COIL, CHOKE, TEM2011 (43H72) Q404B 72471082 SCREW, 3X10MM LH401 23245830 COIL, TRF4100CB (43H72)
  • Page 40 23114425 TRANSISTOR, 2SA1015-Y(TE TC74HC4066AF Q972 23114425 TRANSISTOR, 2SA1015-Y(TE Q769 23114528 TRANSISTOR, 2SC1740S Q973 23114735 TRANSISTOR, 2SA102-Y(C) Q770 23904524 IC, AN7812 (43H72) Q974 23114433 TRANSISTOR, 2SC1815-Y Q771 23314912 TRANSISTOR, 2SC4793 Q975 23114437 TRANSISTOR, 2SC752GTM-Y Q771 23319267 IC, AN79M12F (43H72) QA01 23009182...
  • Page 41 DIODE, MA111 QH006 23906908 IC, MC33078D D217 23118041 DIODE, MA111 QH173 23905666 IC, AT24C1610PC D218 23118041 DIODE, MA111 QH174 23905666 IC, AT24C1610PC (43H72) D219 23118041 DIODE, MA111 QH301 23358557 OPT DEVICE, AM. PHOTOSENSOR D220 23118041 DIODE, MA111 AM-30-24CA (43H72) D301 23118094...
  • Page 42 Location Location Location Location Location Location Location Location Location Location Parts No. Parts No. Parts No. Parts No. Parts No. Description Description Description Description Description Parts No. Parts No. Parts No. Parts No. Parts No. Description Description Description Description Description D604 23118041 DIODE, MA111...
  • Page 43 Location Location Location Location Location Location Location Location Location Location Parts No. Parts No. Parts No. Parts No. Parts No. Description Description Description Description Description Parts No. Parts No. Parts No. Parts No. Parts No. Description Description Description Description Description DH313 23316666 DIODE, ZENER, MTZJ4.7B G101...
  • Page 44 SA06 23145226 SWITCH, 1C1P, PUSH PICTURE TUBE SA07 23145226 SWITCH, 1C1P, PUSH * V901R 23064824 OTHER BLOCK, COUPLING R 43H72 (43H72) SA08 23145226 SWITCH, 1C1P, PUSH SA09 23145226 SWITCH, 1C1P, PUSH * V901R 23086114 OTHER BLOCK, COUPLING R 50H72 (50H72)
  • Page 45 SCREEN, 43KL FRESNEL SHEET, SCREEN43KL-F (43H72) K502 23430799 SCREEN, FRENSNEL SHEET, 50KKP (50H72) K503 23311866 SCREEN, PROTECTOR 43KL, SCR-PRO43KL (43H72) K503 23311865 SCREEN, PROTECTOR 50KL, SCR-PRO50KL (50H72) K601 23405042 MIRROR, 43L 43HX71, MIRROR43L (43H72) K601 23430509 MIRROR50, HR94SC, P503DGA (50H72) – 47 –...
  • Page 46 THIS PAGE IS INTENTIONALLY LEFT BLANK. – 48 –...
  • Page 47 SIGNAL BOARD PD0073Q (43") SIGNAL BOARD PD0073R (50") BOTTOM (FOIL) SIDE – 49 – – 50 –...
  • Page 48 DEF/POWER BOARD PD0074G (43") DEF/POWER BOARD PD0074H (50") BOTTOM (FOIL) SIDE – 51 – – 52 –...
  • Page 49: Pc Boards Bottom View

    A/V BOARD PD0075B BOTTOM (FOIL) SIDE – 53 –...
  • Page 50 SRS-3D BOARD PD0076A BOTTOM (FOIL) SIDE – 54 –...
  • Page 51 DPC BOARD PD0077B BOTTOM (FOIL) SIDE – 55 –...
  • Page 52 DIGI-CONV BOARD PD0638A(43") DIGI-CONV BOARD PD0638B(50") BOTTOM (FOIL) SIDE – 56 –...
  • Page 53 CONV-SEN BOARD PD0079 BOTTOM (FOIL) SIDE CRT DRIVE(RED) BOARD PD0080F BOTTOM (FOIL) SIDE – 57 –...
  • Page 54 CRT DRIVE(GRN) BOARD PD0080F BOTTOM (FOIL) SIDE CRT DRIVE(BLE) BOARD PD0080F BOTTOM (FOIL) SIDE – 58 –...
  • Page 55 SVM-R BOARD PD0080F BOTTOM (FOIL) SIDE SVM-G BOARD PD0080F BOTTOM (FOIL) SIDE SVM-B BOARD PD0080F BOTTOM (FOIL) SIDE – 59 –...
  • Page 56 FRONT BOARD PD0224 BOTTOM (FOIL) SIDE FRONT BOARD PD0224 BOTTOM (FOIL) SIDE FRONT BOARD PD0224 BOTTOM (FOIL) SIDE – 60 –...
  • Page 57: Terminal View Of Transistors

    TERMINAL VIEW OF TRANSISTORS 2SC5144 2SC3852 2SC752GTM 2SC752 2SA1788 2SD1763A 2SA562TM 2SC2482 2SC1569 2SA1015 2SC2655 2SC4544 2SC4721P 2SC1815 2SA1788 2SC2878 2SA1306 2SC1740S 2SA1186A 2SC2120 2SA9335 2SD1554 ON4409 RN2203 RN2201 2SD2253 RN2004 2SD1556 RN1203 2SD2553 RN1204 2SC5143 RN2204 RN1205 RN1202 RN1201 –...
  • Page 58: Schematic Diagram

    SCHEMATIC DIAGRAM MODEL : 43H72 50H72 WARNING: BEFORE SERVICING THIS CHASSIS, READ THE "X-RAY RADIATION PRECAUTION", "SAFETY PRECAUTION" AND "PRODUCT SAFETY NOTICE" ON THE MANUAL FOR THIS MODEL. CAUTION: The international hazard symbols "*" in the schematic diagram and the parts list designate components which have special characteristics important for safety and should be replaced only with types identical to those in the original circuit or specified in the parts list.
  • Page 59: Circuit Block Diagram

    CIRCUIT BLOCK DIAGRAM – 63 – – 64 –...
  • Page 60: Specifications

    SPECIFICATIONS (Representative: 50H72) TELEVISION SYSTEM NTSC standard CHANNEL COVERAGE VHF: 2 through 13 UHF: 14 through 69 Cable TV: Mid band (A-8 through A-1, A through I) Super band (J through W) Hyper band (AA through ZZ, AAA, BBB) Ultra band (65 through 94, 100 through 125) POWER SOURCE 120 V AC, 60 Hz POWER CONSUMPTION...
  • Page 61 TOSHIBA CORPORATION 1-1, SHIBAURA 1- CHOME, MINATO-KU, TOKYO 105-8001, JAPAN...

This manual is also suitable for:

50h72