Toshiba 14N21BS Service Manual
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Toshiba 14N21BS Service Manual

Toshiba 14N21BS Service Manual

Colour television
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TOSHIBA
SERVICE MANUAL

COLOUR TELEVISION

14N21BS
PRINTED IN UK. 2002 C

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Summary of Contents for Toshiba 14N21BS

  • Page 1: Colour Television

    TOSHIBA SERVICE MANUAL COLOUR TELEVISION 14N21BS PRINTED IN UK. 2002 C...

  • Page 2: Servicing Notices On Checking

    SERVICING NOTICES ON CHECKING 1. KEEP THE NOTICES 6. AVOID AN X-RAY As for the places which need special attentions, Safety is secured against an X-ray by consider- they are indicated with the labels or seals on the ing about the cathode-ray tube and the high cabinet, chassis and parts.

  • Page 3: Table Of Contents

    CONTENTS SERVICING NOTICES ON CHECKING ...................... A1-1 HOW TO ORDER PARTS ........................... A1-1 IMPORTANT ..............................A1-1 CONTENTS ..............................A2-1 GENERAL SPECIFICATIONS ........................A3-1~A3-5 DISASSEMBLY INSTRUCTIONS 1.REMOVAL OF ANODE CAP ......................B1-1 2.REMOVAL AND INSTALLATION OF FLAT PACKAGE IC ............... B2-1, B2-2 SERVICE MODE LIST ..........................

  • Page 4: General Specifications

    GENERAL SPECIFICATIONS CRT Size / Visual Size 14 inch / 335.4mmV System CRT Type Normal Deflection degree Magnetic Field BV/BH +0.45G/0.18G Color System Speaker 1 Speaker Position Bottom Size 3 Inch Impedance Sound Output 1.0 W 10%(Typical) 0.8 W DDR SECAM NTSC3.58(AV)+NTSC4.43 PAL60Hz Tuning...
  • Page 5 GENERAL SPECIFICATIONS On Screen Menu Display Menu Type Character Picture Contrast Brightness Colour Tint (NTSC Only) Sharpness Audio Bass Treble Balance BBE On/Off Stable Sound On/Off CH Tuning Manual Auto CH Allocation Language Clock Set On/OffTimer Set On Timer Set Pin Code Registration Panel Lock Nicam Auto Off...
  • Page 6 GENERAL SPECIFICATIONS G-10 Remote Unit RC-FK (CT-835) Control Glow in Dark Remocon Format Custom Code 40-BF h Power Source Voltage(D.C) UM size x pcs UM-4 x 2 pcs Total Keys Keys Keys Power Volume Up / + Volume Down / - Previous Select Picture Menu...
  • Page 7 GENERAL SPECIFICATIONS G-12 Accessories Owner's Manual Language English w/Guarantee Card Remote Control Unit Rod Antenna Poles Pole Terminal type Loop Antenna (W/ Antenna Change Plug) Terminal U/V Mixer DC Car Cord (Center+) Guarantee Card Warning Sheet Circuit Diagram Antenna Change Plug Service Facility List Important Safeguard Yes (Owner's Manual In)
  • Page 8 GENERAL SPECIFICATIONS G-16 Carton Master Carton Content ---- Sets Material Dimensions W x D x H(mm) x -- x -- Description of Origin Gift Box Material Double/Brown Dimensions W x D x H(mm) x 408 x 380 Design As per Buyer's Description of Origin Natural Dropping At 1 Corner / 3 Drop Test...

  • Page 9: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS 3. After one side is removed, pull in the opposite direction to 1. REMOVAL OF ANODE CAP remove the other. Read the following NOTED items before starting work. NOTE After turning the power off there might still be a potential Take care not to damage the Rubber Cap.

  • Page 10: Removal And Installation Of Flat Package Ic

    DISASSEMBLY INSTRUCTIONS REMOVAL AND INSTALLATION OF When IC starts moving back and forth easily after desoldering completely, pickup the corner of the IC using FLAT PACKAGE IC a tweezers and remove the IC by moving with the IC desoldering machine. (Refer to Fig. 2-3.) REMOVAL NOTE Put the Masking Tape (cotton tape) around the Flat...
  • Page 11 DISASSEMBLY INSTRUCTIONS INSTALLATION When bridge-soldering between terminals and/or the soldering amount are not enough, resolder using a Thin- Take care of the polarity of new IC and then install the tip Soldering Iron. (Refer to Fig. 2-8.) new IC fitting on the printed circuit pattern. Then solder each lead on the diagonal positions of IC temporarily.

  • Page 12: Service Mode List

    SERVICE MODE LIST This unit provided with the following SERVICE MODES so you can repair, examine and adjust easily. To enter the Service Mode, press both set key and remote control key for more than 2 seconds. Remocon Key Operations Set Key Reset the user setting items (PICTURE, VOLUME and LANGUAGE) to the initial state VOL.

  • Page 13: When Replacing Eeprom( Memory) Ic

    WHEN REPLACING EEPROM (MEMORY) IC If a service repair is undertaken where it has been required to change the MEMORY IC, the following steps should be taken to ensure correct data settings while making reference to TABLE 1. CD CF Table 1 Enter DATA SET mode by setting VOLUME to minimum.

  • Page 14: Electrical Adjustments

    ELECTRICAL ADJUSTMENTS 1. ADJUSTMENT PROCEDURE 2. BASIC ADJUSTMENTS Read and perform these adjustments when repairing the 2-1: CONSTANT VOLTAGE circuits or replacing electrical parts or PCB assemblies. Place the set with Aging Test for more than 5 minutes. CAUTION Connect the digital voltmeter to TP501. Set condition is AV MODE without signal.
  • Page 15 ELECTRICAL ADJUSTMENTS 2-6: FOCUS 2-10: BRIGHT CENT Receive an 80dB monoscope pattern. Receive the PAL black pattern*. (RF Input) Turn the Focus Volume fully counterclockwise once. Using the remote control, set the brightness and Adjust the Focus Volume until picture is distinct. contrast to normal position.
  • Page 16 ELECTRICAL ADJUSTMENTS 2-13: TINT Receive the NTSC color bar pattern. (Audio Video Input) Using the remote control, set the brightness and contrast to normal position. Connect the oscilloscope to TP023. Activate the adjustment mode display of Fig. 1-1 and press the channel button (20) on the remote control to select "TINT".

  • Page 17: Purity And Convergence

    ELECTRICAL ADJUSTMENTS PURITY AND CONVERGENCE 3-3: STATIC CONVERGENCE ADJUSTMENTS NOTE Adjust after performing adjustments in section 3-2. NOTE Receive the crosshatch pattern from the color bar Turn the unit on and let it warm up for at least 30 generator. minutes before performing the following adjustments.
  • Page 18 ELECTRICAL ADJUSTMENTS 4. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (WIRING CONNECTION) CD801 TP023 R807 CP801 J801 R803 CP802B TP022 CRT PCB CD802 J701 PH001 CP101 CP802A FB401 CP401 VR401 VR420 TP001 R503 VR501 TP501 CP502 AC IN CP1001 CD501 CP501 SPEAKER J1001 J702 J703...

  • Page 19: Block Diagram

    BLOCK DIAGRAM VOL UP AT+5V TU001 MICON IC VOL DOWN IC101 OECF005A SCL SDA Q102 CH UP LED SW ON_TIMER Q103 KEY_IN CH DOWN LED SW D105 P.CON+5V ON TIMER SDA 13 CHROMA AVDD1 IC201 STV2246C V-DRIVE SCL 14 STAND BY AT+5V AVDD2 IC401 TDA8714A...

  • Page 20: Printed Circuit Boards Main/Crt

    PRINTED CIRCUIT BOARDS MAIN/CRT (INSERTED PARTS) SOLDER SIDE TP402 L501_1 J1001 C501 R501 C505_1 TP401 C122 C529 C526 R502 B502 D523 C518_1 C524 W017 W817 R421 TH501 D410 W082 W836 W052 R445 T401 T501 IC501 W016 C542 C528 R510 Q402 R511 C440 D508...
  • Page 21 PRINTED CIRCUIT BOARDS MAIN/CRT (CHIP MOUNTED PARTS) SOLDER SIDE C806 R816 C804 R813 Q603 R618 R602 R646 C005 C004 R005 R639 R607 Q605 R611 R623 C207 C201 Q604 Q602 R219 Q204 R708 R217 R208 Q202 C746 R702 R214 Q201 IC703 R215 C119 R143...
  • Page 22 MICON/TUNER SCHEMATIC DIAGRAM ACCESSORY RESET IC ANT001 (MAIN PCB) IC102 TU-33AP R3111N311A/C TU001 TUWRF4EK-778F2 D105_1 LTL-1BEFJ TM101 R145 R108 RC-FK010 1.2K R139 OS101 RPM7138-H5 TP001 LED SW KRA102SRTK BT002 BT001 R104 R102 R109 Q103 R03(AB)2PXGPI R03(AB)2PXGPI 2.2K 2.2K PH001 D104 C110 C122 003P-2100...
  • Page 23 CHROMA/SIF/VIF/21PIN SCHEMATIC DIAGRAM (MAIN PCB) CF202 TSF5372P SIF BUFFER GNDOUTOUT Q204 2SC2412K C629 R208 W822 L204 L206 C204 VIF PRE.AMP W829 18uH BUFFER Q201 Q202 0.27uH 0.001 B KTC3881S-RTK 2SC2412K RGB SW 2.28 R217 Q601 S101Y S101X 2SC2412K FROM POWER C212 VCO COIL 0.01 B...
  • Page 24 POWER SCHEMATIC DIAGRAM (MAIN PCB) C509 TO SOUND AMP 500V 470P R517 D505 SOUND+B SB290S P.CON+8V SOUND_GND W861 R506 W833 EMERGENCY 22K 1/4W Q504 2SA1624 D506 134.8 135.0 1SS133 C531 R528 RELAY SW Q505 10K 1/4W TO DEFLECTION/CRT KTC3203_Y R521 68K 1/4W C517 0.001...
  • Page 25 DEFLECTION/CRT SCHEMATIC DIAGRAM (MAIN PCB) (CRT PCB) FROM/TO CHROMA/SIF/VIF/21PIN R422 CUT OFF CUT OFF 820 1/4W G.OUT G.OUT G.OUT R.OUT R.OUT R.OUT B.OUT B.OUT B.OUT V-DRIVE IC IC401 TDA8174A V_OUT HEATER HEATER VAMP ABCL ICATH ICATH 180V 180V H_OUT TO CRT FROM DEFLECTION CP802A CP802B...
  • Page 26 SOUND AMP SCHEMATIC DIAGRAM (MAIN PCB) FRONT AUDIO JACK J703 HTJ-032-05AW R712 820 1/4W L714 FRONT VIDEO JACK J702 10uH 0305 HTJ-032-05AY C740 R740 220 1/4W SP1001 CP1001 SPEAKER A2502WV2-2P SA08A05BWB W/WIRE B1001 W5RH3.5X5X1.0 FROM/TO CHROMA/SIF/VIF/21PIN HEADPHONE_JACK J1001 MSJ-035-12A_PC SW_AUDIO_IN FRONT_VIDEO_IN C1006 SCART_AUDIO...

  • Page 27: Micon/Tuner

    WAVEFORMS MICON/TUNER 0.2ms 20µs 500µs 1.00V 1.00V 50mV CHROMA/SIF/VIF/21PIN 0.2ms 20µs 1.00V 0.50V 200mV 100ns 20mV 0.5µs 20µs 1.00V 1.00V 20µs 1.00V 20us 0.5µs 0.50V 1.00V 10ms 20us 20µs 1.00V 1.00V 1.00V NOTH: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.

  • Page 28: Deflection/Crt

    WAVEFORMS 20µs 20µs 20µs 10.0V 1.00V SOUND AMP 500us 20µs 20µs 100mV 5.00V 5.00V DEFLECTION/CRT 10us 10ms 200mV 1.00V 200V 500us 10ms 20µs 500mV 10.0V 10ms 20µs 10.0V NOTH: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.

  • Page 29: Mechanical Exploded View

    MECHANICAL EXPLODED VIEW PCB110 (CRT PCB) PCB010 (MAIN PCB)

  • Page 30: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION A3L801M720 CABINET,FRONT ASSY 701UPJ0305 CABINET,FRONT 735UPB0013 BUTTON,FRAME 761WPAA060 HOLDER,PCB 722549A077 SHEET,RATING 752WSA0272 SHIELD,AUDIO 735UPB0014 BUTTON,POWER 713UPA0021 GLASS,LED 713UPA0020 GUIDE,REMOCON 752WSA0286 SHIELD,IC 702UPA0239 CABINET,BACK 741WUA0019 SPRING,EARTH 752WSA0216 SHIELD,CASE 735UPA0097 BUTTON,BASE 8110630A04 SCREW,TAP TITE(P) BRAZIER 3x10 8109I30804 SCREW,TAP TITE(B) WH7...

  • Page 31: Electrical Replacement Parts List

    ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION RESISTORS RESISTORS R001 R002T2183J 18K OHM 1/2W ! R501 R5X2CD5R6J R,CEMENT 5.6 OHM 5W R002 R002T2183J 18K OHM 1/2W ! R502 R002T2155J 1.5M OHM 1/2W R003 R002T4271J 270 OHM 1/4W ! R503...
  • Page 32 ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION RESISTORS CAPACITORS R714 R801R7750J OHM 1/10W C435 P235W1104J 0.1 UF 100V MKT R715 R801R7750J OHM 1/10W C437 P4J7F3394J CMPP 0.39 UF 250V PMS R719 R801R7104J 100K OHM 1/10W C440 P235W1103J 0.01 UF 100V MKT...
  • Page 33 ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION CAPACITORS TRANSISTORS C1002 E50HU2100M UF 16V Q509 TNAAJ05003 COMPOUND TRANSISTOR KRC111SRTK C1003 E00NU2220M UF 16 V Q510 TNAAC05002 COMPOUND TRANSISTOR KRC103SRTK C1004 CS0RB04W2K 820 PF 50V B Q511 TAAT01281Y TRANSISTOR,SILICON...
  • Page 34 ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION MISCELLANEOUS FH501 06710T0006 HOLDER,FUSE EYF-52BC FH502 06710T0006 HOLDER,FUSE EYF-52BC OS101 0773071001 REMOTE RECEIVER RPM7138-H5 PH001 069D01001A CONNECTOR PCB SIDE 003P-2100 069W01001A CONNECTOR PCB SIDE 003P-2100 ! RY501 0560V20115 RELAY ALKS321 SP1001 070C732003 SPEAKER SA08A05BWB...

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