Toshiba 21N21F Service Manual
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Toshiba 21N21F Service Manual

Toshiba 21N21F Service Manual

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TOSHIBA
SERVICE MANUAL

COLOUR TELEVISION

21N21F
PRINTED IN UK. 2002 C

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Summary of Contents for Toshiba 21N21F

  • Page 1: Colour Television

    TOSHIBA SERVICE MANUAL COLOUR TELEVISION 21N21F 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 21 inch / 544.5mmV System CRT Type NORMAL Deflection degree Magnetic Field BV/BH +0.45G/0.18G Color System PAL/SECAM Speaker 1 Speaker Position Front Size 1.5 x2.5 Inch Impedance Sound Output 5.0 W 10%(Typical) 4.0 W DDR SECAM NTSC3.58(AV)+NTSC4.43 PAL60Hz...
  • Page 5 GENERAL SPECIFICATIONS On Screen Menu Display Menu Type Character Picture Contrast Brightness Color 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 Timer Set Off Timer Set Pin Code Registration Panel Lock Nicam Auto Off...
  • Page 6 GENERAL SPECIFICATIONS Clock and Sleep Timer Max Time - Min Timer Step Clock On Timer Program( On Timer) Off Timer Program( Off Timer) Wake Up Timer Timer Back-up (at Power Off Mode) more than G-10 Remote Unit RC-EY Control Glow in Dark Remocon Format Custom Code 40-BF h...
  • Page 7 GENERAL SPECIFICATIONS G-11 Features Auto Degauss Auto Shut Off Canal+ CATV Anti-theft(Back Up 30 Min.) Memory(Last CH) Memory(Last Volume) Auto Search CH Allocation Just Clock Function Game Position CH Label VM Circuit Full OSD Unitext Fastext Top Text Premiere Comb Filter Lines Auto CH Memory Stable Sound...
  • Page 8 GENERAL SPECIFICATIONS G-13 Interface Switch Front Power (Tact Sw) System Select Main Power SW Sub Power Channel Up Channel Down Volume Up Volume Down Rear AC/DC TV/CATV Selector Degauss Main Power SW Indicator Power Stand-by Stand-by/ON Yes(Red) On Timer Yes(Green) Terminals Front Video Input...

  • 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 Set Key Operations Reset the user setting items (PICTURE, VOLUME, LANGUAGE and NICAM AUTO/ 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. Note: No need setting due to the adjustment value except the list below. 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. Connect the digital voltmeter to TP501. CAUTION Set condition is AV MODE without signal.
  • Page 15 ELECTRICAL ADJUSTMENTS 2-6: WHITE BALANCE 2-10: VERTICAL SIZE NOTE: Adjust after performing CUT OFF adjustment. Receive the monoscope pattern from the Pattern Generator. Place the set with Aging Test for more than 15 minutes. Using the remote control, set the brightness and Receive the gray scale pattern from the Pattern contrast to normal position.
  • Page 16 ELECTRICAL ADJUSTMENTS 2-13: COLOR CENT 2-15: Confirmation of Fixed Value (Step No.) Receive the PAL color bar pattern. (RF Input) Please check if the fixed values of the each adjustment Using the remote control, set the brightness, contrast items are set correctly referring below. and color to normal position.

  • 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) CRT PCB TP803 J801 TP801 CP801 CD803 VR420 VR401 J701 CP803A FB401 CP401 AC IN TP501 R521 CP802A CD501 CP501 VR501 L503 SPEAKER CP1002 CP502 MAIN PCB...

  • Page 19: Block Diagram

    BLOCK DIAGRAM VOL UP TU001 MICON W/T.TEXT VOL DOWN IC101 OECF007A Q102 SCL SDA CH UP LED DRIVE ON_TIMER Q103 KEY_IN CH DOWN LED DRIVE STANDBY LED ON TIMER P.CON+5V D103 STAND BY/P.ON MEMORY SDA 19 D101 CHROMA AVDD1 IC199 IC201 STV2248C V-DRIVE SCL 20...

  • Page 20: Printed Circuit Boards Main/Crt

    PRINTED CIRCUIT BOARDS MAIN/CRT (INSERTED PARTS) SOLDER SIDE CP101 D604 R445 VR401 VR420 J701 R713 W087 D402 CD803A D410 L711 Q702 R417 W057 R418 C725 R416 C405 L403 R410 C446 FB401 L717 R750 W043 L713 IC701 W011 W054 W055 IC702 L401 Q402 R532...
  • Page 21 PRINTED CIRCUIT BOARDS MAIN/CRT (CHIP MOUNTED PARTS) SOLDER SIDE C759 Q703 R728 R137 Q103 Q102 R738 R102 R104 R101 R103 R107 C141_1 C109 C108 C105 C102 C143 R817 C112 C803 R811 R805 C111 C139 C101 C104 R106 R108 IC102_1 R518 Q503 R502 Q1001...
  • Page 22 MICON/TUNER SCHEMATIC DIAGRAM RESET IC IC102_1 TU001 TUWRF4EG-778F2 R3111N311A/C LED DRIVE ON TIMER (MAIN PCB) Q102 D103 2SA1037AK R137 OS101 RPM7138-H5 R104 R103 R102 R101 LED DRIVE STAND BY/P.ON LTL-1CHGE-002A Q103 D101 GREEN 2.2K 1.2K 2SA1037AK R132 ACCESSORY TP001 SLR-342VCT32 CP001 BT101 003P-2100...
  • Page 23 IF/CHROMA SCHEMATIC DIAGRAM (MAIN PCB) SIF BUFFER Q204 2SC2412K R206 VIDEO BUFFER VIF PRE.AMP L206 C204 SAW FILTER Q202 Q201 L204 C214 CF202_1 2SC2412K KTC3881S-RTK 0.22uH 0.022 B TSF5330U SECAM VL SW 10uH R217 120P CH Q303 2SC2412K R304 C641 C212 FROM/TO 21PIN 0.47...
  • Page 24 21PIN/AV SW SCHEMATIC DIAGRAM (MAIN PCB) L713 10uH 0305 VIDEO_SW IC L717 IC702 NJM2234L 10uH Vin1 Vin2 Vin3 V.OUT GND C728 KANP C743 AUDIO SW(MONO) IC IC701 NJM2234L Vin1 Vin2 Vin3 V.OUT FROM SOUND AMP FRONT_V_IN C742 FRONT_A_L FROM/TO MICON/TUNER FORTHD_VCR_1 21PIN JACK J701...
  • Page 25 DEFLECTION/CRT SCHEMATIC DIAGRAM (MAIN PCB) C629 CP802A B2013H02-5P CP802B B2013H02-5P 0.001 B FROM/TO IF/CHROMA R614 CUT_OFF CUT_OFF G.OUT G.OUT G.OUT R.OUT R.OUT R.OUT B.OUT B.OUT B.OUT V-DRIVE IC VAMP CP803A B2013H02-4P CP803B B2013H02-4P IC401 TDA8174A V_OUT R819 ABCL HEATER HEATER 2.2 2W H_OUT 180V...
  • Page 26 POWER SCHEMATIC DIAGRAM (MAIN PCB) D526 30DF6-FC ICP502 R543 0.27 3W 20P_3000 R521 D520 W847 D506 30DF6-FC 0.56 3W R524 1SS133 C517_1 +B.ADJ 47K 1/4W 11.5 PROTECTOR TEST TP501 RELAY SW C503 680P Q505 TP502 TP503 KTC3203_Y 100V TO DEFLECTION/CRT EMERGENCY Q509 2SA1624...
  • Page 27 SOUND AMP SCHEMATIC DIAGRAM (MAIN PCB) TO 21PIN FRONT_A_L FRONT_V_IN FROM MICON/TUNER A_MUTE FROM IF/CHROMA MONO_A_IN FRONT VIDEO J703 HTJ-032-03AY SOUND AMP (STEREO) IC IC1002 LA4600 R707 FROM POWER 100 1/2W FRONT AUDIO L D1001 J704 AT+5V_AVDD HTJ-032-03AW 1SS133 ATT. RIPPLE C736 BUFFER...

  • Page 28: Micon/Tuner

    WAVEFORMS MICON/TUNER IF/CHROMA 50µs 20µs 0.5µs 100mV 0.50V 1.00V 10ms 50µs 1.00V 100mV 200mV 20µs 20µs 50µs 1.00V 1.00V 0.50V 0.2ms 20µs 20µs 1.00V 1.00V 1.00V 50µs 0.2ms 20µs 100mV 1.00V 1.00V NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.

  • Page 29: 21Pin/Av Sw

    WAVEFORMS 20µs 20µs 20µs 100mV 1.00V 1.00V 20µs 20µs 1.00V 1.00V 200mV 20µs 10ms 100mV 1.00V 200mV DEFLECTION/CRT 20µs 20µs 10ms 1.00V 200mV 1.00V 21PIN/AV SW 10ms 20µs 20µs 10.0V 1.00V 1.00V NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.

  • Page 30: Sound Amp

    WAVEFORMS 10ms 20µs 10.0V 20µs 20µs 10.0V SOUND AMP 20µs 0.50V 5.0V 0.2ms 2µs 200V 5.0V 20µs NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.

  • Page 31: Mechanical Exploded View

    MECHANICAL EXPLODED VIEW PCB110 (CRT PCB ASS'Y) PCB010 (MAIN PCB ASS'Y)

  • Page 32: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION A3L908G720 CABINET,FRONT ASSY 8995034000 CORD CLIP UL CO. 701WPJ1142 CABINET,FRONT 711WPA0171 PLATE,FRONT 713WPA0214 GUIDE,REMOCON 735WPA0667 BUTTON,BASE 735WPB0233 BUTTON,FRAME 702UPA0253 CABINET,BACK 735WPB0234 BUTTON,POWER 7230007540 SHEET,JACK 741WUA0001 SPRING,EARTH 899HV3T001 HOLDER,ANODE WIRE 722549A128 SHEET,RATING 755WPA0031 COVER,PCB 761WPA0258 HOLDER,FBT 752WSA0086 SHIELD,IC(30P,40P)

  • Page 33: Electrical Replacement Parts List

    ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION RESISTORS RESISTORS R003 R801R7271J 270 OHM 1/10W R409 R002T2681J 680 OHM 1/2W R004 R801R7271J 270 OHM 1/10W R410 R002T4391J 390 OHM 1/4W R005 R801R7104J 100K OHM 1/10W ! R411 R655U2680J R,FUSE...
  • Page 34 ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION RESISTORS CAPACITORS R634 R801R7472J 4.7K OHM 1/10W C113 CS0RCH4H1J PF 50V CH R636 R801R7473J 47K OHM 1/10W C114 CS0RB0315K 0.1 UF 25V B R638 R801R7222J 2.2K OHM 1/10W C115 E02LT0222M 2200 UF 6.3V...
  • Page 35 ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION CAPACITORS CAPACITORS C523 E02LU1221M 220 UF 10V C1018 E02LU0101M 100 UF 6.3V ! C525 CD39E0M13M CC 0.001 UF 250V C1019 E02LU0221M 220 UF 6.3V ! C526 P2472B104M 0.1 UF 275V PHE840 C1020...
  • Page 36 ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION TRANSISTORS VARIABLE RESISTORS Q103 T6YJ1037K0 TRANSISTOR,SILICON 2SA1037AKT146R,S VR401 V1K6213BT8 VOLUME,SEMI FIXED NVG6THTB102 Q201 T8AA03881S TRANSISTOR,SILICON KTC3881S-RTK VR420 V1K62Q2BT8 VOLUME,SEMI FIXED NVG6THTB471 Q202 T8YJ2412K0 TRANSISTOR,SILICON 2SC2412KT146 R,S VR501 V116313BTC VOLUME,SEMI FIXED...
  • Page 37 TOSHIBA Information Systems (UK) Ltd Consumer Products Division, European Service Centre, Admiralty Way, Camberley, Surrey. GU15 3DT...

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