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Toshiba 50H81 Service Manual

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FILE NO. 020-200109
SERVICE MANUAL
COLOR TELEVISION
N0NSP Chassis
50H81
(TAC0151)
PUBLISHED IN JAPAN, Jun., 2001 So

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Summary of Contents for Toshiba 50H81

  • Page 1 FILE NO. 020-200109 SERVICE MANUAL COLOR TELEVISION N0NSP Chassis 50H81 (TAC0151) PUBLISHED IN JAPAN, Jun., 2001 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 Speaker grille – 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. 1/2 MUTE MUTE (Service mode display) 2.
  • 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 17) 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. Select the "FULL" mode by PIC SIZE button on Remote Control. 3. Call up the adjustment mode display and select the item HIT. 4. Press the VOLUME s or t button to get the picture so that top and bottom of video signal begin to lack.

  • 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 Up : 2 button Selet Green color: 3 button Left : 4 button Blinking of cursor ON/OFF: 5 button Right:...
  • Page 14 Adjusting Dimension of Each Picture Screen (16:9 screen size:) 50 inches (1) HD (1080I/NTSC) QH173,16KB CHIP, UFO–* BANK1 Vspan 38.8mm Hspan 88.5mm 271.5 233.0 116.5 Screen center 116.5 233.0 271.5 22.0 531.0 442.5 265.5 88.5 88.5 265.5 442.5 531.0 22.0 50 inches 16:9 Screen size : Horizontal 1106 mm Vertical 622 mm...

  • Page 15: 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 16: 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 17: Chapter 2 Specific Informations

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

  • Page 18: Location Of Controls

    LOCATION OF CONTROLS TV front Remort sensor (Behibd the screen) Channel ts Volume T S Menu tsT S Automatic Light Sensor VOL T SVOL POWER MENU POWER EXIT TV/VIDEO Video 3 Power indicator Video/audio inputs (behind the door) TOUCH FOCUS TV rear ANT (75 ) AUDIO CENTER...

  • Page 19: 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 POP CH ENTER POP CH s MENU/...

  • Page 20: 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 21: Circuit Block Diagram

    CIRCUIT BLOCK DIAGRAM 50H81 Series BLOCK DIAGRAM – 21 – – 22 –...

  • Page 22: Mechanical Disassembly

    MECHANICAL DISASSEMBLY 1 Speaker Grille Removal 2 Control Panel Removal 3 Front Mask Removal A101 A268 2 screws K501 A202 K502 A214 K503 A213 8 screws A212 A102 4 Shield Plate, Lens Removal 5 Mirror Removal 6 Back Board Removal 7 Light Box Removal 5 screws 4 screws...

  • Page 23: 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 : 50H81 Capacitors ..... CD Ceramic Disk : Plastic Film : Electrolytic Resistors ....
  • Page 24 Location Location Part No. Description Part No. Description – 26 –...
  • Page 25 Location Location Part No. Description Part No. Description – 27 –...
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  • Page 48 Location Location Part No. Description Part No. Description – 50 –...
  • Page 49 Location Location Part No. Description Part No. Description – 51 –...
  • Page 50 Location Location Part No. Description Part No. Description – 52 –...
  • Page 51 SIGNAL BOARD PD0073 BOTTOM (FOIL) SIDE – 53 – – 54 –...
  • Page 52 DEF/POWER BOARD PD0074 BOTTOM (FOIL) SIDE – 55 – – 56 –...
  • Page 53 A/V BOARD PD0075 BOTTOM (FOIL) SIDE – 57 –...
  • Page 54 SRS-3D BOARD PD0076 BOTTOM (FOIL) SIDE – 58 –...
  • Page 55 DPC BOARD PD0077 BOTTOM (FOIL) SIDE – 59 –...
  • Page 56 DIGI-CONV BOARD PD0078 BOTTOM (FOIL) SIDE – 60 –...
  • Page 57 CONV-SEN BOARD PD0079 BOTTOM (FOIL) SIDE CRT DRIVE(RED) BOARD PD0080 BOTTOM (FOIL) SIDE – 61 –...
  • Page 58 CRT DRIVE(GRN) BOARD PD0080 BOTTOM (FOIL) SIDE CRT DRIVE(BLE) BOARD PD0080 BOTTOM (FOIL) SIDE – 62 –...
  • Page 59 SVM-R BOARD PD0080 BOTTOM (FOIL) SIDE SVM-G BOARD PD0080 BOTTOM (FOIL) SIDE SVM-B BOARD PD0080 BOTTOM (FOIL) SIDE – 63 –...
  • Page 60 FRONT BOARD PD0081 BOTTOM (FOIL) SIDE FRONT BOARD PD0081 BOTTOM (FOIL) SIDE FRONT BOARD PD0081 FRONT BOARD PD0081 BOTTOM (FOIL) SIDE BOTTOM (FOIL) SIDE – 64 –...
  • Page 61 WOW BOARD PD0220 BOTTOM (FOIL) SIDE – 65 –...
  • Page 62 NEXT HYPER BOARD PD0264 BOTTOM (FOIL) SIDE – 66 –...

  • Page 63: 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 64 MEMO ..........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................– 68 –...

  • Page 65: Specifications

    0-300 mV(rms) (30% modulation equivalent, 4.7 kohm) AUDIO CENTER CHANNEL INPUT 300 mV(rms) (30% modulation equivalent, 10 kohm) DIMENSIONS/MASS Dimension (W/H/D) Mass 50H81 46-1/8 x 50-3/8 x 21-7/8 inches 320 lbs (1,172 x 1,280 x 555 mm) (145.3 kg) SUPPLIED ACCESSORIES Remote Control with 2 size “AA”...
  • Page 66 TOSHIBA CORPORATION 1-1, SHIBAURA 1- CHOME, MINATO-KU, TOKYO 105-8001, JAPAN...

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