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Toshiba 28Z44B Service Manual
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Toshiba 28Z44B Service Manual

Toshiba 28Z44B Service Manual

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FILE NO. 030-200401
SERVICE MANUAL
Colour television
28Z44B
Jul. 2004 (YC/X)

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Summary of Contents for Toshiba 28Z44B

  • Page 1 FILE NO. 030-200401 SERVICE MANUAL Colour television 28Z44B Jul. 2004 (YC/X)
  • Page 2 TABLE OF CONTENTS CHAPTER 1 GENERAL ADJUSTMENTS SAFETY INSTRUCTIONS ............................3 SET-UP ADJUSTMENT ............................4 SERVICE MODE ..............................8 DESIGN MODE ..............................11 ELECTRICAL ADJUSTMENTS ..........................12 CIRCUIT CHECK ..............................14 CHAPTER 2 SPECIFIC INFORMATIONS SETTING & ADJUSTING DATA ..........................15 LOCATION OF CONTROLS ...........................
  • Page 3 CHAPTER 1 GENERAL ADJUSTMENTS SAFETY INSTRUCTIONS WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRE- CAUTION” AND “PRODUCT SAFETY NOTICE” INSTRUCTIONS BELOW. X-RAY RADIATION PRECAUTION 1. Excessive high voltage can produce potentially hazard- 2. The only source of X-RAY RADIATION in this TV ous X-RAY RADIATION.
  • Page 4 WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRE- CAUTION” AND “PRODUCT SAFETY NOTICE” ON PAGE 3 OF THIS MANUAL. SET-UP ADJUSTMENT I The following adjustments should be made when a complete realignment is required or a new picture tube is installed. Perform the adjustments in order as follows : 1.
  • Page 5 I CIRCUMFERENCE CONVERGENCE ADJUSTMENT CONVERGENCE ADJUSTMENTS NOTE: Before attempting any convergence adjustments, the 1. Loosen the clamping screw of deflection yoke slightly to receiver should be operated for at least fifteen min- allow the yoke to tilt. utes. 2. Temporarily put a wedge as shown in figure 1. (Do not remove cover paper on adhesive part of the wedge.) I CENTER CONVERGENCE ADJUSTMENT 3.
  • Page 6 WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRECAU- TION” AND “PRODUCT SAFETY NOTICE” ON PAGE 3 OF SERVICE MANUAL. SET-UP ADJUSTMENT (FOR FLAT TUBE) I The following adjustments should be made when a complete realignment is required or a new picture tube is installed. Perform the adjustments in order as follows : 1.
  • Page 7 (5)Adjust the sub-4-pole magnets only in case there is any deviation of Xv bow-shaped convergence. (To be usually set at the initial position) Align both sides with the sub-4-pole magnets and minimize the deviation of blue and red with the main 4-pole magnets. Xv bow-shaped deviation of convergence red/blue blue...
  • Page 8 SERVICE MODE 1. ENTERING TO SERVICE MODE 2) Press o button again to 3) While pressing the o button, 1) Press o button once on keep pressing. press MENU button on TV set. Remote Control. Item Data Mute or (Service mode display) 2.
  • Page 9 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 15) 5.
  • Page 10 8. SELF DIAGNOSTIC FUNCTION 1) Press “9” button on Remote Control during display of adjustment menu in the service mode. The diagnosis will begin to check if interface among IC’s are executed properly. 2) During diagnosis, the following displays are shown. Indicated color of mode now selected : Green and Red Indicated color of other modes : White...
  • Page 11 DESIGN MODE 1. ENTERING TO DESIGN MODE 2) While pressing o or CALL button on 1) Select the Service mode. 3) Press MENU button on TV. Remote and press MENU button on TV. ITEM Press DATA Press (Design mode) (Adjustment mode) When QA02 is initialized, items “OPT0”, “OPT1”...
  • Page 12 ELECTRICAL ADJUSTMENTS ITEM ADJUSTMENT PROCEDURE FOCUS VR ADJ 1. Enter the service mode, then select any register item. 2. Press the TV/VIDEO button on the Remote until the black cross-bar pattern ap- pears on the screen. 3. Adjust the FOCUS control (on T461) for well defined scanning lines on the picture screen.
  • Page 13 ITEM ADJUSTMENT PROCEDURE WHITE BALANCE 1. Set Contrast to 40, and brightness to +20 by picture control. ADJUSTMENT 2. Receive the Black and White pattern. 3. Select RCUT, GCUT and BCUT with CHANNEL s, t buttons, to set individual • CUTOFF ADJUSTMENT values to Initial reference data, and to set GDRV and BDRV to Initial reference data with VOLUME ;...
  • Page 14 CIRCUIT CHECK HIGH VOLTAGE CHECK CAUTION: There is no HIGH VOLTAGE ADJUSTMENT on this chassis. Checking should be done following the steps below. 1. Connect an accurate high voltage meter to the second anode of the picture tube. 2. Turn on the receiver. Set the BRIGHTNESS and CONTRAST controls to minimum (zero beam current). 3.
  • Page 15 CHAPTER 2 SPECIFIC INFORMATIONS SETTING & ADJUSTING DATA SAFETY INSTRUCTIONS 28" HIGH VOLTAGE AT ZERO BEAM: 31.4 kV MAX HIGH VOLTAGE: 33.0 kV AC VOLTAGE 230 V Table-1 SERVICE MODE ADJUSTING ITEMS AND DATAS IN THE SERVICE MODE: Item Item Adjustment Reference data Adjustment...
  • Page 16 LOCATION OF CONTROLS Front Back – 16 –...
  • Page 17 Remote Controller ���������������������������������������������������� ���������� ������������������� ������������������� ������������������������������������� ��������������������������������������� �������������������� � ������������������������ � ��������������������� � �������������������������������� � � ���������������������������������� � �������������� �������������� ����������������������������������� ������������������������������������� ������������������������ ��������������� ������������� ��������������������������������� �������������� �������������������� ������������������������������������ �������������������������������������� ������ �� ������������������������� ������������������������������ ������������������ �������������������������� �������������������������������� � � �����...
  • Page 18 · · · · · 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. Model : 28Z44B Capacitors ..... CD : Ceramic Disk PF : Plastic Film EL : Electrolytic Resistors ....
  • Page 19 Location Parts No. Description Location Parts No. Description C542 24100104 CERAMIC CHIP, 25V F 0.1UF Z CA01 24100104 CERAMIC CHIP, 25V F 0.1UF Z C601 24669479 ELECTROLYTIC, 50V 4.7UF M 3A CA02 24100104 CERAMIC CHIP, 25V F 0.1UF Z C602 24669479 ELECTROLYTIC, 50V 4.7UF M 3A CA03 24100104 CERAMIC CHIP, 25V F 0.1UF Z...
  • Page 20 Location Parts No. Description Location Parts No. Description CS05 24797229 ELECTROLYTIC, 50V 2.2UF M R326 24338109 OXIDE METAL FILM, 1W 1 OHM J CS06 24797229 ELECTROLYTIC, 50V 2.2UF M R327 24338109 OXIDE METAL FILM, 1W 1 OHM J CS07 24797229 ELECTROLYTIC, 50V 2.2UF M R336 24382181 OXIDE METAL FILM, 1W 180 OHM J CS08...
  • Page 21 Location Parts No. Description Location Parts No. Description R608 24011223 CHIP, METAL FILM, 1/20W 22K OHM J R4606 24366102 CARBON FILM, 1/6W 1K OHM J R609 24366229 CARBON FILM, 1/6W 2.2 OHM J R4607 24366103 CARBON FILM, 1/6W 10K OHM J R610 24366229 CARBON FILM, 1/6W 2.2 OHM J R4608...
  • Page 22 Location Parts No. Description Location Parts No. Description RB08 24011471 CHIP, METAL FILM, 1/20W 470 OHM J RV84 24366223 CARBON FILM, 1/6W 22K OHM J RB22 24366470 CARBON FILM, 1/6W 47 OHM J RV85 24872750 CHIP, METAL FILM, 1/16W 75 OHM J RB96 24011472 CHIP, METAL FILM, 1/20W 4.7K OHM J RV86...
  • Page 23 Location Parts No. Description Location Parts No. Description LC16 23103828 INDUCTOR, BEAD, TEM2121M Q904 23314965 TRANSISTOR, KTC3198 Y LC20 23103146 EMI FILTER, TEM2030AA Q905 23314052 TRANSISTOR, 2SC3619 LC21 23103159 FILTER, EMI, TEM2028AA, 7.5X6.4X8 60MMH 0.5A Q906 23314965 TRANSISTOR, KTC3198 Y LD01 23103825 INDUCTOR, BEAD, TEM2118M Q907...
  • Page 24 BB22A 23713013 CONNECTOR, SOCKET, B-B 16P 1.5 CABINET PARTS BB22B 23713014 CONNECTOR, BRIDGE PLUG 16P 1.5 A201S 23532641 COVER, FRONT COVER S 28Z44B F470 23144502 FUSE, CARTRIDGE 5.2X20, 250V 1.0A A231 23445811 BUTTON, POWER BUTTON 28Z44B F470A 23165433 FUSE HOLDER, 5.2 SOC...
  • Page 25 SIGNAL BOARD PD1722A (U902) BOTTOM (FOIL) SIDE BB21A BB22A T801 Z420 D490 F801 T4A L/250V Q861A C420 Q861 R490 D436 CAUTION LIVE AREA C421 R426 Q376 Q421 Q376 Q377 RS08 P515A RC02 LC02 QA13 RA13 QA12 RA12 QB01 RS24 CC60 RA05 CC63 CC63...
  • Page 26 CRT-D BOARD PD1723A-1/A-2 (U903A/U903B) MA BOARD PD1474B (U905) BOTTOM (FOIL) SIDE BOTTOM (FOIL) SIDE RI17 CI57 RI16 LI57 LI03 ZI07 ZI01 RI52 R905 P902B RI09 RI01 CI56 Q901 LI01 R914 RI18 L903 C914 C904 C903 Q902 RI31 QI07 LI56 CI02 CI12 Q903 D904...
  • Page 27 TERMINAL VIEW OF TRANSISTORS 2SD2253 2SC3852 2SC752GTM 2SC752 2SA1788 (old) 2SD1763A 2SA562TM 2SC2482 2SC1569 2SC5243 2SC2655 2SA1015 2SC5570 2SC4544 2SC4721P 2SC1815 2SA1788 2SC2878 2SA1306 2SC1740S 2SA1186A 2SC2120 2SA9335 RN2203 2SD1554 ON4409 RN2201 2SD2253 2SD1556 RN2004 RN1203 2SC5143 RN1204 2SD2553 RN2204 RN1205 RN1202 RN1201...
  • Page 28 SCHEMATIC DIAGRAM MODEL : 28Z44B 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 29 – 31 –...
  • Page 30 SPECIFICATIONS MODEL 28Z44B Broadcast systems/channels PAL-I UHF UK21-UK69 Video Input PAL, SECAM, NTSC 3.58/4.43 External connections EXT1 Input 21-pin SCART RGB, A/V EXT2 Input/Output 21-pin SCART A/V, S-video EXT3 Input (front) Phono jack Video Phono jacks Audio L + R...
  • Page 31 TOSHIBA CORPORATION 1-1, SHIBAURA 1- CHOME, MINATO-KU, TOKYO 105-8001, JAPAN...