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akira 14KLS4/CE Service Manual

Chassis: la-76931
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Summary of Contents for akira 14KLS4/CE

  • Page 1: Service Manual

    Colour TV Service Manual...
  • Page 2 -2 - Model: 14KLS4/CE Chassis: LA-76931 Model No.: 14KLS4CE Version: 1.0...

  • Page 3: Table Of Contents

    -3 - CONTENTS SPECIFICATION............................. 4 IMPORTANT SERVICE SAFETY INFORMATION................8 ALIGNMENT PROCEDURE........................7 SERVICE FLOW CHART ........................8 ADJUSTMENT MANUAL ........................9 BLOCK DIAGRAM ..........................13 LA76931..............................14 LV1116 ..............................17 TDA16846.............................. 20 LA78040..............................23 THE WAVEFORM OF STICKING POINT................... 26 CIRCUIT DIAGRAM ..........................

  • Page 4: Specification

    -4 - SPECIFICATION TV PAL D/K, B/G, I System AV NTSC 4.43/3.58MHz VHF LOW 49.75～85.25 MHz VHF HIGH 168.25～216.25MHz Channel UHF 471.25～863.25 MHz CATV 112.25～464.25MHz Line 625 Line Scanning Horizontal Frequency 15625Hz Vertical 50/60 Hz Video 38MHz IF Frequency Sound 31.5/32/32.5 MHz Chroma 33.57 MHz VHF LOW 43 dBμV VHF HIGH 45 dBμV...

  • Page 5: Important Service Safety Information

    -5 - IMPORTANT SERVICE SAFETY INFORMATION Operating the receiver outside of its cabinet or with its back removed involves a shock hazard. Work on these models should only be performed by those who are thoroughly familiar with precautions necessary when working on high voltage equipment. Exercise care when servicing this chassis with power applied.
  • Page 6 -6 - To determine the presence of high voltage, use accurate high impedance HV meter connected between the second anode lead and the CRT dag grounding device. When servicing the High Voltage System remove static charges from it by connecting a 10K Ohm resistor in series with an insulated wire (such as test probe) between the picture tube dag and 2nd anode lead (Have AC line cord disconnected from AC supply).

  • Page 7: Alignment Procedure

    -7 - ALIGNMENT PROCEDURES 1. Use an Isolation Transformer when performing any service on this chassis. 2. Never disconnect any leads while receiver is in operation. 3. Disconnect all power before attempting any repairs. 4. Do not short any position of the circuit while the power is on. 5.

  • Page 8: Service Flow Chart

    -8 - SERVICE FLOW CHART Power supply Check input voltage ― → check voltage of C910 anode ―→ check Pin 3 of N901 ―→ check V901 ―→ check output voltage of T901 secondary coil ―→check voltage of N904, N905 Pin 3 (5.0v) and N903 Pin3 (9.0V) ―→check voltage of N103 Pin 8, 31, 32, 35, 36, 43, 55 (5v) and Pin 11, 19 (8v)―→...

  • Page 9: Adjustment Manual

    -9 - ADJUSTMENT MANUAL 1. Test Notices: Please follow the pointed test steps and choose the right test equipment to conduct adjustment, otherwise good effect of TV set could not be obtained. Pointed bias voltage value should be ensured during test to get satisfied test result. b.
  • Page 10 -10 - FACTORY MENU H-BLK-L H-BLK-R TUNER 0:QJ 1:ALPS VOL LINEAR MEASURE B-Y DC LEVEL R-Y DC LEVEL B-Y DC LEVEL-YUV R-Y DC LEVEL-YUV FACTORY MENU RED-BIAS GREEN-BIAS BLUE-BIAS RED-DRIVE GREEN-DRIVE BLUE-DRIVE OPTION MENU BACK COVER OPTION Q-ASM OPTION OPT-AV-SYSTEM Y-IN 0:P48 1:P54 OPT-YUV LANGUAGE SW CE...
  • Page 11 -11 - 5. High Voltage check Use 220V power supply to measure that power supply is up to standard before checking the high voltage. b. Connect the precise high voltage meter to second anode of CRT. Turn on the receiver, adjust Brightness and Contrast until the standard picture is obtained and set the screen “OFF”.
  • Page 12 -12 - 9. OSD position adjustment Receive PAL five circles pattern signal. b. Enter into FACTORY MENU 00 and select OSD-H-POSITION, then press V+/V- button to adjust OSD to the proper position. Model No.: 14KLS4CE Version: 1.0...

  • Page 13: Block Diagram

    -13 - BLOCK DIAGRAM R G B OUT H OUT V OUT LA78040/ STV9302 AUDIO OUT TDA7263 VIDEO OUT AUDIO OUT 9V 5V 25V 110V POWER SUPPLY TDA16846 + MOSFET Model No.: 14KLS4CE Version: 1.0...

  • Page 14: La76931

    -14 - LA76931 TECHNICAL NOTE Remark Function PIN 1 SIF OUTPUT 2.8V DC PIN 2 IF AGC FILTER PIN 3 SIF INPUT 3.3V DC PIN 4 FM FILTER PIN 5 FM OUTPUT 2.5V~3.5V PIN 6 AUDIO OUTPUT PIN 7 SND APC FILTER PIN 8 IF VCC 5V DC...
  • Page 15 -15 - Remark Function PIN 32 C control PIN 33 32.768KHz PIN 34 32.768KHz PIN 35 CPU VCC 5V DC PIN 36 POWER Control standby PIN 37 PIN 38 PIN 39 KEY control PIN 40 RESET PIN 41 PIN 42 CPU GND PIN 43 CDD VCC...
  • Page 16 -16 - THE BLOCK DIAGRAMS OF LA 76931 Model No.: 14KLS4CE Version: 1.0...

  • Page 17: Lv1116

    -17 - LV1116 TECHNICAL NOTE Function Remark PIN 1 PIN 2 INPUT A(R) PIN 35 INPUT A(L) PIN 3 INPUT B(R) PIN 34 INPUT B(L) PIN 4 INPUT C(R) PIN33 INPUT C(L) PIN 5 LINE-OUT(R) Function SW Output PIN 32 LINE_OUT(L) PIN 6 DC CUT(R)
  • Page 18 -18 - Function Remark PIN 19 C-DATA C control data input PIN 20 C-CLK PIN 21 PIN 22 L+R LPF PIN 29 AviSS HPF PIN 36 ANALOG GND Model No.: 14KLS4CE Version: 1.0...
  • Page 19 -19 - THE BLOCK DIAGRAMS OF LV1116 Model No.: 14KLS4CE Version: 1.0...

  • Page 20: Tda16846

    -20 - TDA16846 TECHNICAL NOTE Function Remark Off Time Circuit A parallel RC-circuit between this pin and ground PIN 1 determines the ringing suppression time and the standby-frequency. Primary Current Simulation A capacitor between this pin and ground and a resistor between this pin and the positive terminal of the primary PIN 2 elcap quantifies the max.
  • Page 21 -21 - Function Remark Primary Voltage Check This is the input of the primary voltage check. The voltage at the anode of the primary elcap has to be fed to this pin via a voltage divider. If the voltage of this pin PIN 11 falls below 1 V, the SMPS is switched off.
  • Page 22 -22 - THE BLOCK DIAGRAM OF TDA16846 Model No.: 14KLS4CE Version: 1.0...

  • Page 23: La78040

    -23 - LA78040 TECHNICAL NOTE Function Remark PIN 1 INVERTING INPUT PIN 2 25VDC PIN 3 PUMP UP OUTPUT PIN 4 PIN 5 Ver.OUTPUT PIN 6 OUTPUT STAGE PIN 7 NON INV.INPUT 9VDC THE BLOCK DIAGRAM OF LA78040 Model No.: 14KLS4CE Version: 1.0...
  • Page 24 -24 - TDA7263 Technical note Function Remark PIN 1 NON INVERTING INPUT(1) PIN 2 INVERTING INPUT(1) PIN 3 SVR/MUTING PIN 4 INVERTING INPUT(2) PIN 5 NON INVERTING INPUT(2) PIN 6 PIN 7 PIN 8 OUTPUT(2) 8Ω PIN 9 PIN 10 OUTPUT(1) 8Ω...
  • Page 25 -25 - Model No.: 14KLS4CE Version: 1.0...

  • Page 26: The Waveform Of Sticking Point

    -26 - THE WAVEFORM OF STICKING POINT N103 PIN 60 (VIDEO OUTPUT) N103 PIN 56 (VIDEO INPUT) N103 PIN 12 (R OUTPUT) N103 PIN 13 (G OUTPUT) Model No.: 14KLS4CE Version: 1.0...
  • Page 27 -27 - N103 PIN 14 (B OUTPUT) CRT ----R CRT -----G CRT -----B N103 PIN 17 (VER OUTPUT) N103 PIN 21 (H OUTPUT) Model No.: 14KLS4CE Version: 1.0...
  • Page 28 -28 - N440 PIN 5 (VER OUTPUT) V401 –B (H INPUT) V401 ---C V402 ---B V402 ---C V901 ---G Model No.: 14KLS4CE Version: 1.0...
  • Page 29 -29 - V901 ---S Model No.: 14KLS4CE Version: 1.0...

  • Page 31: Pcb Board

    -31 - PCB BOARD Model No.: 14KLS4CE Version: 1.0...
  • Page 32 -32 - Model No.: 14KLS4CE Version: 1.0...

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