Toshiba 21N21N Service Manual
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Toshiba 21N21N Service Manual

Toshiba 21N21N Service Manual

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FILE NO: 050-200244
TOSHIBA

SERVICE MANUAL

COLOUR TELEVISION
21N21N
PRINTED IN UK. 2003 C

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Summary of Contents for Toshiba 21N21N

  • Page 1: Service Manual

    FILE NO: 050-200244 TOSHIBA SERVICE MANUAL COLOUR TELEVISION 21N21N PRINTED IN UK. 2003 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 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 G-10 Remote Unit RC-EY 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, Spanish, Portugal, Swedish, Norwegian w/Guarantee Card Remote Control Unit Rod Antenna Poles Pole Terminal type Loop Antenna 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 575 x 555 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 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. 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. Connect the digital voltmeter to TP501. CAUTION Set condition is AV MODE without signal.
  • Page 15 ELECTRICAL ADJUSTMENTS 2-6: FOCUS 2-10: BRIGHT CENT Receive a 70dB 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 TP803. 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) CRT PCB TP803 J801 TP801 CP801 CD803 VR420 VR401 J701 CP803A FB401 CP401 TP501 AC IN R521 CP802A CD501 CP501 VR501 CP1002 L503 SPEAKER CP502 J702 J704 J703 MAIN PCB...

  • Page 19: Block Diagram

    BLOCK DIAGRAM VOL UP TU001 MICON W/T.TEXT VOL DOWN IC101 OECF006A 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 IF/CHROMA AVDD1 IC199 IC201 STV2246C 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 R713 W087 J701 CP001 CP803A D402 CD803A D410 D401 Q702 L711 R417 W057 R418 C405 R416 L403 R410 C446 L713 FB401 L717 R750 W043 IC701 W011 W054 L401 W055 IC702...
  • 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 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 TU001 TUWRF4EG-778F2 LED DRIVE (MAIN PCB) ON TIMER Q102 D103 2SA1037AK OS101 R137 RPM7138-H5 LED DRIVE ACCESSORY R104 R103 R102 R101 STAND BY/P.ON Q103 LTL-1CHGE-002A 2SA1037AK D101 GREEN 2.2K 1.2K R132 BT101 R03(AB)2PXGPI TP001 SLR-342VCT32 CP001 003P-2100 BT102 C122 R03(AB)2PXGPI...
  • Page 23 IF/CHROMA SCHEMATIC DIAGRAM (MAIN PCB) SIF BUFFER Q204 2SC2412K R206 VIDEO BUFFER VIF PRE.AMP SAW FILTER L206 C204 Q202 Q201 CF202_1 L204 C214 2SC2412K KTC3881S-RTK SAF38.9MAZ220Z 0.27uH 0.001 B 10uH R217 120P CH C212 FROM/TO 21PIN CF201 C621 TPS5.5MB-TF21 C641 0.01 B MONO_A_OUT1 0.47...
  • Page 24 21PIN SCHEMATIC DIAGRAM (MAIN PCB) L713 10uH 0305 L717 VIDEO SW IC IC702 NJM2234L 10uH Vin1 Vin2 Vin3 V.OUT GND C728 KANP C743 AUDIO SW(MONO) IC IC701 NJM2234L Vin1 Vin2 Vin3 V.OUT 4.94 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 VAMP CP803A B2013H02-4P CP803B B2013H02-4P V-DRIVE IC IC401 TDA8174A V_OUT R819 ABCL HEATER HEATER 2.2 2W...
  • Page 26 POWER SCHEMATIC DIAGRAM (MAIN PCB) D526 30DF6-FC R543 ICP502 20P_3000 0.27 3W D520 D506 30DF6-FC R521 W847 1SS133 0.56 3W +B.ADJ C517_1 PROTECTOR TEST 11.5 R524 TP501 RELAY SW 680P Q505 47K 1/4W TP502 TP503 C503 KTC3203_Y 100V EMERGENCY TO DEFLECTION/CRT Q509 2SA1624 H.DRV+B...
  • Page 27 SOUND AMP SCHEMATIC DIAGRAM (MAIN PCB) TO 21PIN FRONT_A_L FRONT_V_IN FROM MICON/TUNER A_MUTE FROM IF/CHROMA FRONT VIDEO J703 HTJ-032-03AY MONO_A_IN FROM POWER R707 SOUND AMP (STEREO) IC IC1002 LA4600 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

    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 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 A3L907G720 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 722549A126 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 R422 R002T4334J 330K OHM 1/4W R004 R801R7271J 270 OHM 1/10W R423 R002T4224J 220K OHM 1/4W R005 R801R7104J 100K OHM 1/10W R425 R002T2561J 560 OHM 1/2W...
  • Page 34 ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION RESISTORS CAPACITORS R707 R002T2101J 100 OHM 1/2W C128 CS0RCH4E2J 150 PF 50V CH R710 R801R7102J OHM 1/10W C130 P235WE105J UF 63V MKT R711 R002T4750J OHM 1/4W C131 E50HU2100M UF 16V...
  • Page 35 ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION CAPACITORS DIODES C611 E50HU53R3M 3.3 UF 50V ! D504 D2WTRM11C0 DIODE,SILICON RM11C-EIC C612 CS0RB04E3K 0.0015UF 50V B D505 D2WT011E10 DIODE,SILICON 11E1-EIC C613 E02LU1471M 470 UF 10V D506 D1VT001330 DIODE,SILICON...
  • Page 36 ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION TRANSISTORS MISCELLANEOUS Q703 T8YJ2412K0 TRANSISTOR,SILICON 2SC2412KT146 R,S CP101 069X160379 CONNECTOR PCB SIDE 06JQ-ST Q711 T8YJ2412K0 TRANSISTOR,SILICON 2SC2412KT146 R,S CP401 069S450089 CONNECTOR PCB SIDE A1561WV2-A5P Q801 TCATC3199Y TRANSISTOR,SILICON KTC3199_Y-AT CP501...

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