SERVICE MANUAL SPECIFICATIONS Model Number 21E88 Color system PAL, NTSC3.58, NTSC4.43 RF system Sound system B/G, M, D/K, I Video system PAL4.43, NTSC3.58, NTSC4.43 (50/60Hz) Programs preset 236 (0-235) Antenna input 75¦¸ (unbalanced) Picture tube Effective screen dimensions 406¡Á 305mm (Approx.)
SERVICE MANUAL SAFETY INSTRUCTIONS AND MAINTENANCE ¡ ° WARNING: BEFORE SERVICING THIS CHASSIS, READ THE X-RAY RADIATION ¡ ± ¡ ° ¡ ± ¡ ° ¡ ± PRECAUTION SAFETY PRECAUTION PRODUCT SAFETY NOTICE INSTRUCTION BELOW. X-RAY RADIATION PRECAUTION 1. The EHT must be checked every time the TV is serviced to ensure that the CRT does not emit X-ray radiation as result of excessive EHT voltage.
SERVICE MANUAL 4. When replacing ICs, use specific tools or a static-proof electric iron with small power (below 35W). 5. Do not use a magnetized screwdriver when tightening or loosing the deflection yoke assembly to avoid electronic gun magnetized and decrement in convergence of the CRT. 6.
SERVICE MANUAL SAFETY SYMBOL DESCRIPTION The lightning symbol in the triangle tells you that the voltage inside this product may be strong enough to cause an electric shock. Extreme caution should be exercised when working on the TV with the back removed. This is an international hazard symbol, telling you that the components identified by the symbol have special safety-related characteristics.
SERVICE MANUAL ADJUSTMENTS SET-UP ADJUSTMENTS The following adjustments should be made when a complete realignment is required or a new picture tube is installed. Perform the adjustments in the following order: 1. Color purity 2. Convergence 3. White balance Notes: The purity/convergence magnet assembly and rubber wedges need mechanical positioning.
SERVICE MANUAL Fig. 1 2. Convergence Adjustment Preparation: Before attempting any convergence adjustment, the TV should be operated for at least 15 minutes. 2.1 Center convergence adjustment 2.1.1 Receive dot pattern. 2.1.2 Adjust the brightness/contrast controls to obtain a sharp picture. 2.1.3 Adjust two tabs of the 4-pole magnet to change the angle between them and red and blue vertical lines are superimposed each other on the center of the screen.
SERVICE MANUAL deflection yoke assembly on the picture tube. 2.2.6 Detach the temporarily mounted wedge and put it in either upper space. Fasten the deflection yoke assembly on the picture tube. 2.2.7 After fastening the three wedges, recheck overall convergence and ensure to get optimal convergence.
SERVICE MANUAL CIRCUIT ADJUSTMENTS Preparation: Circuit adjustments should be made only after completion of set-up adjustments. Circuit adjustments can be performed using the adjustable components inside the TV set. For TVs with C bus control, first change the bus data. 1.
SERVICE MANUAL 3. High Voltage Inspection Measure voltages of test points on the main PCB with the digital voltmeter. Measure the CRT high voltage with the high-voltage testing equipment and heater voltage with the high-frequency effective voltmeter. The rated values are shown as below. Table 2 Test Point Voltage (V)
SERVICE MANUAL 5.2 Requirements for insulation resistance Measure resistance between naked metal of the TV and feed end of the power cord to be infinity with a DC-500 high resistance meter and insulation resistance between the naked metal and degaussing coil to be over 20M¦¸ . 6.
SERVICE MANUAL 0: No 1: Yes Bit7 Write-in LOGO 0: No 1: Yes Bit6 NICAM DK for CHINA With two sets of AV terminals, Bit5 0£º Yes (Recommended) 1£º No refresh AV terminals ? 0: No 1: Yes Bit4 Screen saver MODE1 Bit3 0: No...
SERVICE MANUAL Option bit for default language by BIT 3 0: Chinese 1: English AUTO button and initialization BIT 2 PWM output option 0: No 1: Yes BIT 1 Instant on 1: Yes 0£º No AV Switch 4053 option 0: No 1: Yes BIT 0 Audio processing IC (SOUND...
SERVICE MANUAL Bit 2 Y-MUTE 0: No 1: Yes Bit 1 No use Bit 0 No use Horizontal position of OSD RCUT R cut off GCUT G cut off BCUT B cut off GDRV G drive BDRV B drive CNTX Contrast Max.
SERVICE MANUAL COLN Color Min. TNTX Tint Max. TNTN Tint Min. Sharp center for NTSC 3.58 (TV) Sharp center for NTSC 3.58 (VIDEO) Sharp center for other color system (TV) Sharp center for other color system (VIDEO) Sub sharp center in DVD ASSH Asymmetry sharpness SHPX...
SERVICE MANUAL 00: Off 01: Black stretch point, 25 IRE Bit 1.0 Black stretch 10: 35IRE 11: 45IRE CLTO Bit 7 Killer off 0: Normal 1: Always killer off Chroma 0: PAL/ NTSC killer sensitivity, 1mVpp Bit 6 P/N ID data 1: 10mVpp (TV¬...
SERVICE MANUAL Adjusting difference between vertical linear in PAL and NTSC VLIS Shift data of 50 Hz/ 60 Hz Correction No use DPCS No use HIT69 Vertical amplitude in 16:9 mode (PAL) DPC69 No use Vertical amplitude in 16:9 mode (NTSC) HIT69S DPC69S No use...
SERVICE MANUAL Data Description Blanking Period Picture Period AFC gain BIT 3.2 (in VIDEO mode) HAFC Data Description Blanking Period Picture Period AFC gain BIT 1.0 (in TV mode) Volume output data at 1% Volume output data at 25% Volume output data at 50% V100 Volume output data at 100% Woofer...
SERVICE MANUAL RSNS R sense 00: x 0 20: x 0.5 3F: x 1.0 GSNS G sense 00: x 0 20: x 0.5 3F: x 1.0 BSNS B sense 00: x 0 20: x 0.5 3F: x 1.0 001: 45.75 MHz 011: 38.9 MHz PIF frequency 6.5.4...
SERVICE MANUAL VTST No use PYNX Normal H.SYNC Max. 0-----------3F PYNN Normal H.SYNC Min. 0-----------3F PYXS ASM/search H.SYNC Max. 0-----------3F PYNS ASM/search H.SYNC Min. 0-----------3F BASC Bass volume center BASX Bass volume Max. TREC Treble volume center BALC Balance volume center BASS IN MUSIC MODE SET BAS1 TRE1...
SERVICE MANUAL NICH MONO->NICAM level (No use in simple version) AFC gain data setting in TV mode: 1: Adjust HAFC gain in the lowest two bits of HAFC Bit 2 0: With weak signal received, AFC gain = 0x10; with strong signal received, AFC gain = 0x00 NOIS Criterion of signal strength: >NOIS: Weak signal...
SERVICE MANUAL (No use in simple version) MDB6C MDB high pass corner 2 20 Hz frequency 3 30Hz (0x07) 30 300 Hz (No use in simple version) MDB6B MDB low pass corner 5 50 Hz frequency 6 60Hz (0x08) 30 300 Hz (No use in simple version) Mdb2dh Subwoofer...
SERVICE MANUAL 2. REMOTE CONTROL Fig. 7 Remote control Notes: (1) When in operation ¡¡ please point your remote control directly to the infrared sensor. (2) Do not expose the remote control to impacts ¡¡ water or disassemble it. (3) Do not repeatedly press the buttons on the remote control. Allow interval of no less than two seconds.
SERVICE MANUAL 3. BASIC FUNCTIONS Power On/Off 1. Memory power on Plug in the supply socket and press the MAIN POWER SWITCH on the TV. The TV enters the former mode before Power-off ¡¡ i.e. the TV directly enters the TURN ON mode if in the TURN ON mode before power-off, or enters the STANDBY mode if in the STANDBY mode before power-off.
SERVICE MANUAL 3. On-screen display Press the DISPLAY button repeatedly in the TV or AV mode to display the current information on the screen and turn off the display respectively. With other OSD, pressing the DISPLAY button first can turn it off. 4.
SERVICE MANUAL Tuning in This section gives descriptions about adjustment of items in the TUNING menu. 1. Auto search After selecting “ASM” in the TUNING menu, press the VOL+ button. The TV will search automatically in sequence. After auto search, the TV will store receivable channels and returns to CH NO.
3. CHASSIS DESCRIPTION General Description CN-18EA chassis is applied in 21E88 series. By use of Toshiba V/C/D-MCU 2IN1 IC for TV small signal processing and bus control, the chassis enables TV tuning, adjustment, control and picture correction, featuring high-integration, high-performance-to-price ratio and high-reliability and compact circuit with fewer external components.
SERVICE DATA TECHNICAL DATA OF KEY ICS 1. TOSHIBA 2IN1 IC SERIES 1) General Description Toshiba 2IN1 IC series are super ICs combined small signal processing with 8-bit micro control unit, including TMPA8801/8802/8803/8807/8808/8809/8812/8813/8821/8823/ 8827/8829 with the following features. Table 6...
SERVICE MANUAL TMPA8801/8807CMBNG /CPBNG/CRBNG /CSBNG MCU AND SIGNAL PROCESSOR FOR A PAL/NTSC/SECAM TV The TMPA8801/8807CMBNG /CPBNG /CRBNG /CSBNG is an integrated circuit for a PAL/NTSC/SECAM TV. A MCU and a TV signal processor are integrated in a 64-pin shrink DIP package. The MCU contains 8-bit CPU, ROM, RAM, I/O ports, timer/counters, A/D converters, an on-screen display controller, remote control interfaces, IIC bus interfaces and the Closed...
SERVICE MANUAL 2). Features H igh speed 8-bit CPU (TLCS-870/X series) CCD Decoder I nstruction execution time: 0.5 ¡¡ s (at 8 MHz) D igital data slicer for NTSC ( TMPA8801/8807CMBNG) 32-Kbytes ROM, 2-Kbytes RAM C lock generation for OSD display (TMPA8801/8807CPBNG) ...
SERVICE MANUAL 3). Block Diagram for TMPA8801 Fig. 13...
SERVICE MANUAL 4). Block Diagram for TMPA8807 Fig. 14...
SERVICE MANUAL 5). Basic Structure 5.1). Internal Connections TMPA8801/8807 has two pieces of IC chip in one package, using Multi-Chip-Package (MCP) technology. One is a micro controller (MCU) and the other one is a signal processor (SP) for a color TV. There are some internal connections between these two ICs for handling below signals.
SERVICE MANUAL of functions work properly, so that designing the oscillation frequency accurately is required. The spec crystal is recommended to be within fosc: 8 MHz +/-20 ppm ftemp: 8 MHz +/-40 ppm (-20°C to +65°C) While RESET of MCU is active, the MCU function stops. Hardware and software initialization sequence including power supplies control is required, because status of any hardware after the RESET period is unknown especially horizontal oscillator which is a very basic timing generator of SP operation.
SERVICE MANUAL uP AVDD Power VDD for OSD Oscillator circuit Supply Supply 5 V P52/SDA (SDA) (I/O) IIC bus serial data input/output P51/SCL (SCL) (I/O) IIC bus serial clock input/output P50/PWM 7 bit/TC2/ Int0 (/PWM8) (output) 7-bit D/A conversion (PWM) output (TC2) (input) Timer/Counter input...
SERVICE MANUAL Terminal to be connected capacitor to generate V saw signal. V saw V saw amplitude is kept constant by V AGC function. V OUT Output terminal for Vertical driving pulse. H.VCC 9 V VCC terminal for DEF circuit. Supply 9 V. -(For TMPA8801) Connect to GND via resister Terminal for switching of PIP mode...
SERVICE MANUAL IF VCC 5 V VCC terminal for IF circuit. Supply 5 V. S-Reg.F Terminal to be connected capacitor for stabilizing internal bias. Deemph/ Terminal to be connected capacitor for SIF Det Audio out De-Emphasis. IF AGC Terminal to be connected with IF AGC filter.
SERVICE MANUAL 2. AUDIO POWER AMPLIFIER TDA8943SF/TDA8944J 6 W MONO BRIDGE TIED LOAD (BTL) AUDIO AMPLIFIER 1). General description The TDA8943SF is a single-channel audio power amplifier with an output power of 6 W at an 8 Ω load and a 12 V supply. The circuit contains a Bridge Tied Load (BTL) amplifier with an all-NPN output stage and standby/mute logic.
SERVICE MANUAL 3. TDA8944J 2 X 7 W STEREO BRIDGE TIED LOAD (BTL) AUDIO AMPLIFIER 1). General descriptio n The TDA8944J is a dual-channel audio power amplifier with an output power of 2 × 7 W at an 8 Ω load and a 12 V supply. The circuit contains two Bridge Tied Load (BTL) amplifiers with an all-NPN output stage and standby/mute logic.
SERVICE MANUAL 4). Pinning information 4.1) Pinning Fig 19. Pin configuration. 4.2) Pin description Table 11 Pin description Symbol Description OUT1− negative loudspeaker terminal 1 GND1 ground channel 1 supply voltage channel 1 OUT1+ positive loudspeaker terminal 1 n.c. not connected IN1+ positive input 1 n.c.
SERVICE MANUAL half supply voltage decoupling (ripple rejection) IN2+ positive input 2 n.c. not connected OUT2− negative loudspeaker terminal 2 GND2 ground channel 2 supply voltage channel 2 OUT2+ positive loudspeaker terminal 2 TDA8944J: Stereo power amplifier, Max output power: 2¡Á 7W...
SERVICE MANUAL 4. VERTICAL SCAN OUTPUT STAGE CIRCUIT LA78040/LA78041 Both LA78040/LA78041 are vertical scan output stage power amplifiers. But there is a little bit difference between the two amplifiers, that is, LA78040 has supply voltage of 24V and output current of 1.8A while LA78041 has supply voltage of 30V and output current of 2.2A LA78040 /LA78041...
SERVICE MANUAL 5. TDA9808T SINGLE STANDARD VIF-PLL WITH QSS-IF AND FM-PLL DEMODULATOR 1). Features 2). General Description ·5V supply voltage (9V supply voltage for The TDA9808T is an integrated circuit for TDA9808T (DIP20) only) single standard (negative modulated) vision ·Applicable for IFs (lntermediate Frequencies) of IF signal processing and FM demodulation, 38.9MHz, 45.75MHz and 58.75 MHz with single reference QSS-IF in TV and VTR...
SERVICE MANUAL 6. MSP34X0G MULTISTANDARD SOUND PROCESSOR FAMILY Release Note: Revision bars indicate significant Other processed standards are the Japanese changes to the previous edition. The hardware FM-FM multiplex standard (EIA-J) and the and software description in this document is FM Stereo Radio standard.
SERVICE MANUAL 7. EEPROM AT24C04/08/16 1) Features Low-voltage and Standard-voltage Operation -2.7 (Vcc=2.7V to 5.5V) -1.8 (Vcc=1.8V to 5.5V) Internally Organized 128x8(1K), 256x8 (2K), 512x8 (4K), 1024x8 (8K) or 2048x8 (16K) 2-wire Serial Interface Schmitt Trigger, Filtered Inputs for Noise Suppression Bi-directional Data Transfer Protocol 100kHz (1.8V, 2.5V, 2.7V) and 400 kHz (5V) Compatibility Write Protect Pin for Hardware Data Protection...
SERVICE MANUAL 3) Pin Configuration 8-lead TSSOP Table 12 8-lead MAP Pin Name Function A0-A2 Address Inputs Serial Data Serial Clock Input Write Protect No Connect Bottom View Fig. 24 8-pin PDIP 8-lead SOIC Fig.25 4) Pin Description SERIAL CLOCK (SCL): The SCL input is used to positive edge clock data into each EEPROM device and negative edge clock data out of each device.
SERVICE MANUAL protection. The Write Protect pin allows normal read/write operations when connected to ground (GND). When the Write Protect pin is connected to Vcc, the write protection feature is enabled and operates as shown in table 13. Table 13 WP Pin Part of the Array Protected Status...
SERVICE MANUAL 8. SWITCH-MODE POWER SUPPLY IC STRG5653/G8656 1). General Description The STRG5653/G8656 are part of the STRG5600/G8600 series thick-film ICs for switch-mode power supply incorporating power MOSFET with a high-precise error amplifier. The ICs feature fewer external components, small-size and standard power supply. The series STR-G8600 use Chip on Chip technology with the same operation principle as STR-G5600.
SERVICE MANUAL SERVICE DATA OF KEY ICS Table 14 Functions and Service Data of AT24C08/16 Pins Digital Multimeter Pin No. Function Description Reference Voltage Positive Resistance Negative Resistance (20KΩ) (20KΩ) Address input 0.001 0.00 Address input 0.001 0.00 Address input 0.001 0.00 Common ground...
SERVICE MANUAL REPLACEMENT OF PARTS 1. DESCRIPTION Many electrical and mechanical components in this chassis have special safety-related characteristics. Components which have these special safety characteristics in this manual and its supplements are identified by the international hazard symbols or UL, FCC, FDA or VDE marking on the circuit diagram and parts list.
Final Assembly Diagram for 21E88 or or White nitro magnetic paint Q04-3 White nitro magnetic paint Q04-3 Soldering agent Soldering agent Tin solder Tin solder Plasticine Plasticine Protection film 2124 - width=250mm Protection film 2124 - width=250mm Binding wire XJ-100...
FINAL WIRING DIAGRAM FOR 21E88 Side AV Board Assembly Side AV Board Assembly XPK03B XPK03B XPK04B XPK04B Wired Connector XPK03 Wired Connector XPK03 From Wire Connector XS10A of Front Cover Assembly From Wire Connector XS10A of Front Cover Assembly Main Board Assembly...