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TOSHIBA
SERVICE MANUAL
COLOUR TELEVISION
21N21E2
PRINTED IN UK. 2003 C
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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. Make sure to keep the voltage peripheral circuit, etc. indications and notices in the operation manual. Therefore, when repairing the high voltage pe- ripheral circuit, use the designated parts and 2. AVOID AN EL
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CONTENTS SERVICING NOTICES ON CHECKING ...................................................................................................... A1-1 HOW TO ORDER PARTS ........................................................................................................................... A1-1 IMPORTANT ................................................................................................................................................ A1-1 CONTENTS ....................................
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GENERAL SPECIFICATIONS G-1 TV CRT CRT Size / Visual Size 21 inch / 544.5mmV System CRT Type NORMAL Deflection 90 degree Magnetic Field BV/BH +0.45G/0.18G Color System PAL/SECAM Speaker 1 Speaker Position Front Size 1.5 x2.7 Inch Impedance 8 ohm Sound Output MAX 5.0 W 10%(Typical) 4.0 W DDR SECAM No NTSC3.58(AV)+NTSC4.43 Yes PAL60Hz Yes G-2 Tuning Broadcasting System CCIR System B/G D/K I System Tuner and System 1Tuner Receive CH Destination Hyper Tuning System F-Synth Input Impeda
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GENERAL SPECIFICATIONS G-7 On Screen Menu Yes Display Menu Type Character Picture Yes Contrast Yes Brightness Yes Colour Yes Tint (NTSC Only) Yes Sharpness Yes Audio No Bass No Treble No Balance No BBE On/Off No Stable Sound On/Off No CH Tuning Yes Manual Yes Auto Yes CH MAPPING Yes CH Allocation No Text Langage(East/West) Yes Language Yes Clock Set No On/OffTimer Set Yes On Timer Set No Pin Code Registration No Panel Lock Yes Nicam Auto Off No AV Colour System Yes Sound System No Auto 4:3 Defau
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GENERAL SPECIFICATIONS G-10 Remote Unit RC-GX Control Glow in Dark Remocon No Format NEC Custom Code 40-BF h Power Source Voltage(D.C) 3V UM size x pcs UM-4 x 2 pcs Total Keys 34 Keys Keys Power Yes 1/Rename Yes 2/Move Yes 3 Yes 4 Yes 5 Yes 6 Yes 7 Yes 8 Yes 9 Yes 0 Yes Volume Up / + Yes Volume Down / - Yes Previous Yes Select Picture Yes Menu Yes OK(Enter) Yes EXIT Yes Audio Select No On/OffTimer Yes Mute Yes DSP/surround/Virtual Dolby No Woofer/Bass No Picture Size No T'TEXT Keys TEXT / MIX
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GENERAL SPECIFICATIONS G-11 Features Auto Degauss Yes Auto Shut Off Yes Canal+ No CATV No Anti-theft(Back Up 30 Min.) No Memory(Last CH) Yes Memory(Last Volume) Yes BBE No Auto Search Yes ITS No CH Allocation No CH MAPPING Yes Just Clock Function No Game Position No CH Label No VM Circuit No Full OSD No Noise Blue Back No T'Text Yes Text type Fastext Text Language English , French, Swedish, Hungarian Finnish, Turkish, German, Dutch Portuguese, Spanish, Italian, Greek Polish, Russian, Bulgarian,
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GENERAL SPECIFICATIONS G-13 Interface Switch Front Power (Tact Sw) No System Select No Main Power SW Yes Sub Power No Channel Up Yes Channel Down Yes Volume Up Yes Volume Down Yes Rear AC/DC No TV/CATV Selector No Degauss No Main Power SW No Indicator Power No Stand-by No Stand-by/ON Yes(Red) On Timer Yes(Green) Terminals Front Video Input Yes(RCA) Audio Input Yes(RCA) Other Terminal Head Phone(MONO) Rear Video Input(Rear1) No Video Input(Rear2) No Audio Input(Rear1) No Au
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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. voltage that is very dangerous. When removing the Anode Cap, make sure to discharge the Anode Cap's INSTALLATION potential voltage. 1. Clean the spot where the cap was located with a small * Do not use pliers
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DISASSEMBLY INSTRUCTIONS 3. When IC starts moving back and forth easily after 2.REMOVAL AND INSTALLATION OF 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 1. Put the Masking Tape (cotton tape) around the Flat Some ICs on the PCB are affixed with glue, so be Package IC to protect other parts from any damage. careful not to break or damage the foil of each IC (Refer
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DISASSEMBLY INSTRUCTIONS INSTALLATION 4. When bridge-soldering between terminals and/or the soldering amount are not enough, resolder using a Thin- 1. 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. (Refer to Fig. 2-5.) IC Thin-tip Soldering Iron Soldering Iron Fig. 2-8 5. Finally, confirm the soldering status on four sides of the Sol
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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. Set Key Remocon Key Operations Reset the user setting items (PICTURE, VOLUME and LANGUAGE) to the initial state VOL. (-) MIN 0 for delivery. Initialization of the factory. NOTE: Do not use this for the normal servicing. VOL. (-) MIN 1 If you set a factory initialization, the memories are r
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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. 1. Place the set with Aging Test for more than 5 minutes. Connect the digital voltmeter to TP501. CAUTION 2. Set condition is AV MODE without signal. 3. • Use an isolation transformer when performing any 4. Adjust the VR501 until the DC voltage is 117 ± 1.0V. service on this chassis. • Before remo
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ELECTRICAL ADJUSTMENTS 2-7: WHITE BALANCE 2-10: VERTICAL POSITION/VERTICAL LINEARITY NOTE: Adjust after performing CUT OFF adjustment. 1. Receive the monoscope pattern from the Pattern Generator. 1. Place the set with Aging Test for more than 10 minutes. 2. Using the remote control, set the brightness and 2. Receive the gray scale pattern from the Pattern contrast to normal position. Generator. 3. Adjust the VR401 until the horizontal line becomes fit to 3. Using the remote control, set the brig
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ELECTRICAL ADJUSTMENTS 2-13: TINT 2-15: Confirmation of Fixed Value (Step No.) 1. Receive the NTSC color bar pattern. (Audio Video Input) Please check if the fixed values of the each adjustment 2. Using the remote control, set the brightness and contrast items are set correctly referring below. to normal position. NO. FUNCTION RF AV 3. Connect the oscilloscope to TP024. 02 AGC GAIN 00 --- 4. Activate the adjustment mode display of Fig. 1-1 and 04 R CUTOFF 00 --- press the channel button (20) on
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ELECTRICAL ADJUSTMENTS 3-3: STATIC CONVERGENCE 3. PURITY AND CONVERGENCE ADJUSTMENTS NOTE NOTE Adjust after performing adjustments in section 3-2. 1. Receive the crosshatch pattern from the color bar 1. Turn the unit on and let it warm up for at least 30 minutes before performing the following adjustments. generator. 2. Combine red and blue of the 3 color crosshatch pattern 2. Place the CRT surface facing east or west to reduce the on the center of the screen by adjusting the pair of terrestrial
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CP101 TU001 CD801 R805 R803 ELECTRICAL ADJUSTMENTS 4. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (WIRING CONNECTION) CRT PCB TP024 CP806 TP022 J801 CP802B CP803B CRT VR420 J701 VR401 FB401 CRT CP401 CD802 TP501 TP001 R521 L302 CP802A AC IN DEGAUSS COIL SPEAKER CD501 VR501 CP502 CP1002 CP501 J702 OS101 J703 J704 MAIN PCB D-5 CP801 CD803 CP803A
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BLOCK DIAGRAM CH UP TU001 MICON W/T.TEXT IC CH DOWN IC101 OECF013B Q102 SCL SDA BPL AGC IF VOL UP LED DRIVE 49 ON_TIMER 4 5 7 1 11 Q103 56 VOL DOWN KEY_IN LED DRIVE 9 STANDBY LED I2C ON TIMER P.CON+5V D103 STAND BY/P.ON 19 5 MEMORY IC CHROMA IC SDA SDA D101 39 AVDD1 IC199 IC201 STV2248E V-DRIVE IC 20 6 SCL SCL S-24C16AFJA-TB-01 8 6 7 IC401 TDA8174A 31 AVDD2 OSD-B 15 34 OSD-B 25 AVDD3 AT+5V Vs 10 P.CON+25V OSD-G 16 35 OSD-G 1 OSD-R POWER OUTPUT 17 36 OSD-R DY OS101 1 3 1 REMORT VERT 47 TR
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R534 R509 HS501 Q501 CP803A CD803A R402 D526 CP801_1 PRINTED CIRCUIT BOARDS MAIN/CRT (INSERTED PARTS) SOLDER SIDE CP101 VR420 W112 R430 L706 R407 W833 L708 R428 J701_1 L704 L707 L711 W804 W115 W016 D410 D712 R713 R715 R716 R714 W012 C412 W033 D405 W027 D527 R703 R412 W013 W071 R401 C403 IC502 W114 D403 W124 W054 C440_1 W123 R446 Q513 Q402 FB401_1 W028 CP001 R546 R411 R213 W816 Q509 T401_1 R547 W021 Q514 CF201 R524 R530 W079 L203 R308 W047 W045 R521 C437_2 CF204 L204 W070 W090 R422 W091 W020 D601
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PRINTED CIRCUIT BOARDS MAIN/CRT (CHIP MOUNTED PARTS) SOLDER SIDE R132 Q703 R137 Q103 Q102 R738 R126 C736 R102 R103 R104 R101 R107 R603 C140 C109C108 R605 R816 Q601 C102 C112 W853 R811 C111_1 C101 C104 C132 R148 IC102 R512 C139_1 C509 IC199 Q1002 Q503 R141 R1005 R502 R1010 R108 C1010 Q510 R538 R537 R1015 Q403 R647 R507 C609 R639 R630 Q508 Q512 R607 Q609 R541 C215 C530 C201 C210_2 B_SHORT R219 R217 Q204 C604_1 R215 R206 Q201 R202 C203 C006 Q702 C502_2 C007 IC701 R721 R005 W824 C721 W836 C731 R737
