Akai 29CT24FS Service Manual
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Akai 29CT24FS Service Manual

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COLOUR TV SET
Models:
29CT24FS
29CT71FS
SERVICE MANUAL
www.akai.ru

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Summary of Contents for Akai 29CT24FS

  • Page 1 COLOUR TV SET Models: 29CT24FS 29CT71FS SERVICE MANUAL www.akai.ru...

  • Page 2: Table Of Contents

    SERVICE MANUAL TABLE OF CONTENTS SPECIFICATIONS ......................1 SAFETY INSTRUCTIONS AND MAINTENANCE ......... 2 X-RAY RADIATION PRECAUTION ..................2 SAFETY PRECAUTION ......................2 PRODUCT SAFETY NOTICE ....................3 SAFETY SYMBOL DESCRIPTION ................... 3 MAINTENANCE ..........................4 ADJUSTMENTS ........................5 SET-UP ADJUSTMENTS ......................

  • Page 3: Specifications

    SERVICE MANUAL SPECIFICATIONS Table 1 Specifications Model Number 29CT24FS, 29CT71FS Color system PAL, SECAM RF system Sound system B/G, D/K Video system PAL4.43, SECAM, NTSC3.58, NTSC4.43 (50/60Hz) Programs preset 236(0-235) Antenna input 75 (unbalanced) Picture tube (Approx.) 478 363mm Effective screen dimensions Video/Audio inputs Composite-3;...

  • Page 4: X-Ray Radiation Precaution

    SERVICE MANUAL INSTRUCTIONS FOR SERVICE SAFETY 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.

  • Page 5: Product Safety Notice

    SERVICE MANUAL 6. When remounting the TV chassis, ensure that all guard devices, such as nonmetal control buttons, switch, insulating sleeve, shielding cover, isolating resistors and capacitors, are installed on the original place. 7. Replace blown fuses within the TV with the fuse specified in the parts list. 8.

  • Page 6: Maintenance

    SERVICE MANUAL have special safety-related characteristics. C UL This symbol tells you that the critical components identified by the C-UL marking have been evaluated to the UL and C-UL standards and have special safety-related characteristics. This symbol tells you that the critical components identified by the VDE marking have special safety-related characteristics.

  • Page 7: Adjustments

    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: ①...
  • Page 8 SERVICE MANUAL Fig. 1 2.1.4 Turn both tabs at the same time keeping the angle constant to superimpose red and blue horizontal on the center of the screen. 2.1.5 Adjust two tabs of the 6-pole magnet to superimpose red/blue line and green line. 2.1.6 Remember red and blue movement.
  • Page 9 SERVICE MANUAL Fig. 2 4-pole Magnet Movement 6-pole Magnet Movement Center Convergence by Convergence Magnets Incline the Yoke Up (or Down) Incline the Yoke Right (or Left) Circumference Convergence by DEF Yoke Fig.3...

  • Page 10: Circuit Adjustments

    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 I C bus control, first change the bus data. 1.
  • Page 11 SERVICE MANUAL to minimum (0μA). 3.3 The high voltage reading should be less than the limited EHT voltage. 3.4 Change the brightness from minimum to maximum, and ensure high voltage not beyond the limitation in any case. Nominal EHT voltage: 29.5±1.2KV Limited EHT voltage: 32KV 4.
  • Page 12 SERVICE MANUAL Use the ↓/↑buttons on the remote control to highlight an adjustment and the ←/→ buttons to adjust it. The POS+/-,↑/↓/←/→,1~6, RECALL, VOL+/-, MUTE and POWER buttons on the remote control function in the S mode, but 100+, 7, 8, 9 and 0 buttons not. 6.2 Adjustments for Service mode and design mode Table 3 ：...
  • Page 13 SERVICE MANUAL TV - AV1(S) - AV3(S) - DVD BIT 0 TV - AV1(S) - AV3(S) TV - AV1(S) - DVD TV - AV1 BIT 7 TC90A49 option 0: No 1: Yes BIT 6 TA1343 option 0: No 1: Yes BIT 5 TC90L01 option 0: No...
  • Page 14 SERVICE MANUAL COLC Color center (for NTSC) TNTC Tint center (for NTSC) TNTCAV Tint center (for NTSC IN AV) COLP Color center (for PAL) COLS Color center (for SECAM) DCOL DVD color SCOL Sub color center (for DVD) SCNT Y- sub contrast CNTC Contrast center CNTN...
  • Page 15 SERVICE MANUAL CLTM 00: USA (105 degree) Japan (93 degree) BIT 4.3 NTSC matrix (TV & M) 10: DVD CLVD(DVD) 000: -40 nsec 001: 0 010: 40 nsec 011: 80 nsec BIT 2.1.0 Y DL CLVO(50hz) 100: 120 nsec 101: 160 nsec 110: 200 nsec 111: 240 nsec /CLVM（60hz）...
  • Page 16 SERVICE MANUAL Data Description Blanking Period Picture Period AFC gain BIT 3.2 (in VIDEO mode) HAFC Data Description BIT 1.0 Blanking Period Picture Period AFC gain (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...
  • Page 17 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 BAS1 Bass in MUSIC mode setting TRE1...
  • Page 18 SERVICE MANUAL 6.3 Adjustments and Bus data Table 4 Item Data Item Data Item Data Item Data * MODE0 CNTC # HITS GSNS * MODE1 CNTN # VLIN BSNS * MODE2 BRTX # VSC * MODE3 BRTN # VLIS STBY * MODE4 COLX # VSS...
  • Page 19 SERVICE MANUAL TNTCAV SECD * WOOFER * WON1 COLP # HPOS STST WON2 COLS # VP50 FLG0 NOIS DCOL # HIT FLG1 VATT SCOL # HPS REFP SCNT # VP60 RSNS Notes: The data sheet may differ dependent on different models. ①...

  • Page 20: Structure And Chassis Function Description

    SERVICE MANUAL STRUCTURE AND CHASSIS FUNCTION DESCRIPTION 1. STRUCTURE BLOCK DIAGRAM L Speaker R Speaker...

  • Page 21: Block Diagram For Supply Voltage System

    SERVICE MANUAL 2. BLOCK DIAGRAM FOR SUPPLY VOLTAGE SYSTEM...

  • Page 22: Chassis Description

    SERVICE MANUAL 3． CHASSIS DESCRIPTION General Description CN-18ED chassis is applied in PF2939E. 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.

  • Page 23: Service Data

    SERVICE MANUAL SERVICE DATA TECHNICAL DATA OF KEY ICS 1. TOSHIBA 2IN1 IC SERIES TMPA8827CMBNG /CPNG/CSNG MCU AND SIGNAL PROCESSOR FOR A PAL/NTSC/SECAM TV The TMPA8827CMNG /CPNG /CSNG 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.
  • Page 24 SERVICE MANUAL □ Two 8-bit internal timer/counter 2 ch □ Time base timer, watchdog timer □ 16 interrupt sources: external 5, internal 11 □ IIC bus interface (multi-master) RGB/Base-Band  I ntegrated 1 H base-band delay line ・ TV Processor ...
  • Page 25 SERVICE MANUAL 2) Block Diagram Fig. 7 Block diagram...
  • Page 26 SERVICE MANUAL 3) Basic Structure 3.1) Internal Connections TMPA8827 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.
  • Page 27 SERVICE MANUAL RESET period is unknown especially horizontal oscillator which is a very basic timing generator of SP operation. 4) Terminal Interface MCU Block Table 7 Pin No. Pin Name Interface Ci Function P61/LED1/ADC 8 bit (/KWU5) (input) Key on wake up input (AIN5) (input) A/D converter analog input...
  • Page 28 SERVICE MANUAL (TC2) (input) (/INT0) P40/PWM 14 bit 14/12-bit D/A conversion (PWM) output (/PWM0) (output) P20/Int5/Stop External interrupt input (/INT5) (input) STOP mode release signal input (/STOP) (input) P31/Int4/TC3 External interrupt input (INT4) (input) Timer/Counter input (TC3) (input) P30/Int3/RXIN External interrupt input (INT3) (input) Remote control signal...
  • Page 29 SERVICE MANUAL (#17) voltage via 270Ω. Output terminal for fsc wave signal. fsc out (Output level =0.55Vp-p typ.) ABCL Input terminal for ABL/ACL control. Ew out Output terminal for East-West correction signal. VCC terminal for IF circuit. IF VCC 9 V Supply 9 V.
  • Page 30 SERVICE MANUAL VCC terminal for RGB circuit. RGB VCC9 V Supply 9 V. ROUT Output terminal for R signal. GOUT Output terminal for G signal. BOUT Output terminal for B signal. TV AGND GND terminal for Analog block. 5) Microcontrollers Descriptions Fig.
  • Page 31 SERVICE MANUAL 2. AUDIO POWER AMPLIFIER TDA8944J 2 X 7 W STEREO BRIDGE TIED LOAD (BTL) AUDIO AMPLIFIER 1) General description 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.
  • Page 32 SERVICE MANUAL 4) Pinning information 4.1) Pinning Fig 10. Pin configuration.
  • Page 33 SERVICE MANUAL 4.2) Pin description Table 9: 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. not connected IN1− Negative input 1 IN2−...
  • Page 34 SERVICE MANUAL 3. 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 LA7840 (N301) Vertical Deflection Output Circuit...
  • Page 35 SERVICE MANUAL 4.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...
  • Page 36 SERVICE MANUAL 3) Pin Configuration 8-lead MAP 8-lead TSSOP Pin Name Function A0-A2 Address Inputs Serial Data Serial Clock Input Write Protect No Connect Bottom View Fig. 13 8-lead SOIC 8-pin PDIP Fig. 14 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.
  • Page 37 SERVICE MANUAL WRITE PROTECT (WP): The AT24C01A/02/04/16 has a Write Protect pin that provides hardware data 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 the following table.
  • Page 38 SERVICE MANUAL 5. 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.
  • Page 39 SERVICE MANUAL 6. TC90L01N AUDIO/VIDEO SWITCHING IC FOR TVs The TC90L01N is an audio/video switching IC for TV sets. Conforming to I C bus standards, it allows you to perform various switching operations through the bus lines by using a microcomputer. This IC has the functions of audio mute, ALC (Auto Level Control), audio volume and so on.
  • Page 40 SERVICE MANUAL 2). Block Diagram V CC V1 -V /Y in V2 -V in V out TV -V in Y out C out V1 -C in Mute I/O-1 Logic I/O-2 V1 -L in V2 -L in Volume TV -L out TV -V in Mon-L out Volume...
  • Page 41 SERVICE MANUAL 3) Pin Assignment Fig.19 Pin assignment...
  • Page 42 SERVICE MANUAL 4) Pin Description Table 12 Pin No. Name Function This pin is for input a left audio signal from the main demodulator in the TV set. The signal fed into this pin is TV-L in presented to TV-L out, and Mon-L out. The input dynamic range of this pin is 6.0 Vp-p and the input resistance is 120 k.
  • Page 43 SERVICE MANUAL resistance is 30 k. This pin is for input a right audio signal from an external source (V1 channel). The signal fed into this pin is presented to TV-R V1-R in out, and Mon-R out. The input dynamic range of this pin is 6.0 Vp-p and the input resistance is 120 k.
  • Page 44 SERVICE MANUAL This outputted can be muted independently of TV-L out by bus control. This pin is for output left audio signal. The signal fed into TV-L in, V1-L in, or V2-L in is outputted from this pin. TV-L out This output can be muted independently of TV-R out by bus control.

  • Page 45: Service Data Of Key Ics

    SERVICE MANUAL SERVICE DATA OF KEY ICS Table 13 Functions and Service Data of TMPA8827PSGN (N210)’s Pins Pin No. Voltage（V） 2.22 Resistance(KΩ) 4.55 22.8 22.7 Pin No. Voltage（V） 1.22 1.87 6.63 4.16 Resistance(KΩ) 35.7 0.79 36.3 36.3 15.6 Pin No. Voltage（V）...
  • Page 46 SERVICE MANUAL Table 14 Functions and Service Data of TDA8944J (N603)’s Pins Digital Multimeter Functions Description Reference Voltage Positive Resistance Negative Resistance (20KΩ) (20KΩ) Negative loudspeaker terminal 1 7.98 ∞ ∞ Ground channel 1 Supply voltage channel 1 14.9 Positive loudspeaker terminal 1 ∞...
  • Page 47 SERVICE MANUAL 2.22 1.30 1.30 In-phase input terminal 2.22 4.58 4.55 Inverting input terminal 24.13 1.55 1.55 Supply voltage Pump supply voltage output/vertical flyback 2.61 7.09 5.93 pulse output Table 16 Functions and Service Data of AT24C16 (N230)’s Pins Digital Multimeter Function Description Reference Voltage Positive...

  • Page 48: Replacement Of Parts

    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.
  • Page 49 APPENDIX: CIRCUIT DIAGRAM (1) JUC7.820.1117...
  • Page 50 CIRCUIT DIAGRAM (2) CRT RGB SIDE AV B OARD JUC7.820.1014 JUC7.820.1151...
  • Page 51 FINAL ASSEMBLY DIAGRAM FOR 29CT24FS, 29CT71FS 16 16 To the joint of the power switch To the joint of the power switch A View A View 10 10 (X4) (X4) 13 13 (X4) (X4) 560m m 22 22 White nitro magnetic paint Q04-3...
  • Page 52 FINAL WIRING DIAGRAM FOR 29CT24FS, 29CT71FS Indicator PCB Assembly Indicator PCB Assembly Remote Sensor PCB Assembly Remote Sensor PCB Assembly Infrared Sensor PCB Assembly Infrared Sensor PCB Assembly XPK01 XPK01 XPK01 XPK01 Wired Connector XP602A Wired Connector XP602A Wired Connector XPL01...
  • Page 53 MAIN PRINTED CIRCUIT BOARD DIAGRAMS...
  • Page 54 CRT RGB PRINTED CIRCUIT BOARD AV PRINTED CIRCUIT BOARD...
  • Page 55 POWER PRINTED CIRCUIT BOARD...
  • Page 56 PARTS ON SOFT SWITCH PRINTED CIRCUIT BOARD REMOTE SENSOR AND INDICATOR PRINTED CIRCUIT BOARD SIDE AV PRINTED CIRCUIT BOARD...

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