1. Manuals
  2. Brands
  3. akira Manuals
  4. TV
  5. 14LA/ANZ
  6. Service manual

akira 14LA/ANZ Service Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
Colour TV
Service Manual

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the 14LA/ANZ and is the answer not in the manual?

Questions and answers

Related Manuals for akira 14LA/ANZ

Summary of Contents for akira 14LA/ANZ

  • Page 1 Colour TV Service Manual...
  • Page 2 -2 - Model No.: 14LAANZACDC(G) Version: 1.0...

  • Page 3: Table Of Contents

    -3 - CONTENTS SAFETY INSTRUCTION........................4 SPECIFICATION............................. 8 KEY ICS & ASSEMBLIES........................9 SIGNAL PROCESS ..........................10 SYSTEM BLOCK DIAGRAM......................21 IC DATA & SERVICE DATA ........................ 24 CIRCUIT ADJUSTEMENT........................36 SERVICE MODE & BUS DATA......................42 TROUBLE SHOOTING FLOW CHART....................50 PART LIST .............................

  • Page 4: Safety Instruction

    -4 - SAFETY INSTRUCTIONS Warning: Before servicing this chassis, read the “X-Ray radiation precaution”, “Safety precaution” and “product safety notice” instructions below. X-RTY 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 -5 - 5. When replacing wires or components to terminals or tags, wind the leads around the terminal before soldering. When replacing safety components identified by the international hazard symbols in the circuit diagram and part list, it must be the company-approved type and must be mounted as the original.
  • Page 6 -6 - Avoid exposing the television receiver to direct, Sunlight and other source of the heat. Do not stand the television receiver directly on other produces, which give off heat E. g. video Cassette players. Audio amplifiers. Do not block the ventilation holes in the back cover.
  • Page 7 -7 - Do not place your television on an unstable cart stand, shelf or table. Serious injury to an individual, and damage to the television, may result if it should fall. When the television receiver is not used for an extended period of time, it is advisable to disconnect the AC power cord from the AC outlet.

  • Page 8: Specification

    -8 - SPECIFICATION Model Number 14S01 RF system Color system: PAL, NTSC3.58, NTSC4.43 Sound system: D/K, I, M, B/G Video system PAL, NTSC3.58, NTSC4.43 (50/60Hz) Receiving channel VHF: C1 ~ C12 UHF: C3 ~ C57 CATV: Z1 ~ Z37 Programs preset Antenna input 75Ω...

  • Page 9: Key Ics & Assemblies

    -9 - KEY ICS AND ASSEMBLIES Serial No. Position Type Function Description N101 LA76818A Small signal processor N451 TDA9302 /LA78040 Vertical output circuit N601, N602 LA4285 /LA4287 3W /5W sound power amplifier N701 LC863432B-54H7 System control micro processor N801 CD4053BE Audio /video switch circuit N551 L7809CV...

  • Page 10: Signal Process

    -10 - SIGNAL PROCESS 1. HIGH /INTERMEDIATE FREQUENCY SIGNAL PROCESSOR Through the high /intermediate frequency signal processor, the RF TV signal received by the antenna is high-frequency amplified and converted to develop and output an IF signal, then are IF amplified and demodulated to develop a video signal and SIF signal as well as AFT control signal and AGC control signal.
  • Page 11 -11 - In the IF filtering circuit V101, VD101, R116, R117, R106, R112 and R115 are formed into an IF absorption selection circuit, which is controlled by the level from N701’s Pin15 output high level, V101 saturates and conducts, and R106 is integrated into the paralleled resonator comprising R112 and VD101, by which the resonating frequency dot is moved to low frequency section and IF and amplitude frequency characteristics are stretched.
  • Page 12 -12 - All the color trap in the luminance channel, band pass filtering circuit in the chroma channel and filter adjuster are controlled by the broadcast system identifying circuit and I C bus to ensure correct and complete Y /C separation when different-system signals received.
  • Page 13 -13 - To correctly process chroma signals, firstly identify the input chroma signals. The C bus controls LA76818A to identify chroma signals. To identify chroma signals, identify signal systems and subcarrier frequency. For NTSC signals, the subcarrier modulated by two color difference signals will not be progressively out-phased while the subcarrier modulated by R-Y color different signal PAL will be progressively out-phased.
  • Page 14 -14 - The demodulated color difference signals are sent into the color difference signal selector after clamped by the clamper. If with SECAM demodulation function, the circuit also sends color difference signals output from the SECAM demodulator to the color difference signal selector from Pin34 and Pin36. Under the control of the C bus, the color difference signals selected by the selector are sent to the base band delay line and adder respectively for further processing.
  • Page 15 -15 - d) White balance adjuster Traditional white balance is adjusted through adjusting the bright and dark balance potentiometers of the CRT drive circuit. The white balance adjuster of the chassis is equipped in LA76818A, which is performed by the CPU through the I C bus.
  • Page 16 -16 - In the SPLL circuit, the frequency at which a SIF carrier signal is developed ranges from 4.5M to 6.5M which is used for demodulating M, B/G, I or D/K SIF signal is received, firstly perform discrimination adjustment mentioned above and calibrate the SIF carrier generated from SPLL.
  • Page 17 -17 - In addition, LA76818A can automatically control operating mode of the vertical output circuit by means of the I C bus signal with 50/60Hz vertical frequency auto identifying circuit built-in, ensuring picture’s vertical size unchanged with 50Hz or 60Hz vertical frequency. b) Sync separator The sync separator in LA76818A consists of a horizontal sync separator (including a sync separation triode T and comparison amplifier 1) and vertical sync separator.
  • Page 18 -18 - As the chassis can receive multi-system signals, horizontal scan frequency differs dependent on different-system TV signals. To make the horizontal oscillating signal in the horizontal counting frequency divider, which are controlled by the CPU through the I C bus. The CPU counting divider to count up or count down and counting amount according to size and direction of the phase.
  • Page 19 -19 - Vertical divider The horizontal frequency oscillation pulse from the horizontal scan count divider is sent to the vertical count divider. Meanwhile the vertical sync signal from the vertical sync separator (frequency separator) is also sent to the vertical count divider. Controlled by the vertical sync pulse, the circuit counts horizontal frequency pulses and identifies and correct vertical frequency, all of which are controlled by the CPU through the I...
  • Page 20 -20 - amplifier. The amplified vertical sawtooth voltage is output from Pin5 to the deflection yoke to generate deflection current. R452 and C459 filter out of horizontal frequency element inducted by the horizontal scan circuit. R460 and C458 eliminate parasitic oscillation generated when the deflection yoke and distributed capacitors resonate.

  • Page 21: System Block Diagram

    -21 - SYSTEM BLOCK DIAGRAMS V-out R out L out V1 in R1 in L1 in V2 in R2 in L2 in A76818A (N101) Small Signal processing IC 180V 115V Fig. 1 Structure Block Diagram of 14/21S01 Chassis Model No.: 14LAANZACDC Version: 1.0...
  • Page 22 -22 - Model No.: 14LAANZACDC Version: 1.0...
  • Page 23 -23 - Model No.: 14LAANZACDC Version: 1.0...

  • Page 24: Ic Data & Service Data

    -24 - IC DATA AND SERVICE DATA LA76818A SMALL SIGNAL PROCESSING CIRCUIT 1. Features LA76818A is a multi system color TV specific monolithic IC developed by SANYO Co. in 2002, which is controlled by the I C bus. LA76818 comprises a tuning circuit and all small signal processing circuit including a PIF /SIF /luminance and chroma signal processing circuit, PAL /NTSC processing circuit, RGB signal processing and controlling circuit, horizontal /vertical small signal processing, SIF processing and demodulating circuit and volume controlling circuit.
  • Page 25 -25 - 2. Block diagram Model No.: 14LAANZACDC Version: 1.0...
  • Page 26 -26 - LA4285 3W POWER AMPLIFIER AND STEREO 1. Feature TV sound output Exchangeable with LA4285 (3W) /LA4287 (5W) pin Package SIP-10HD (Pitch=2.54mm, straight type) Heat protection loop and over voltage protection loop built in Power output: 3W (Vcc=19V /RL=8Ω) LA4285 5W (Vcc=22V /RL=8Ω) LA4287 2.
  • Page 27 -27 - 3. Refer to table 5 about functions and data of the LA4285’s Pins Model No.: 14LAANZACDC Version: 1.0...
  • Page 28 -28 - LA78040 /STV9302 (N451) VERTICAL DEFLECTION OUTPUT CIRCUIT 1. Features Low power dissipation due to built-in pump-up circuit Vertical output circuit Thermal protection circuit built in Excellent crossover characteristics DC coupling possible Feature Power amplifier Flyback generator Output current up to 2 App Thermal protection Description The STV9302 is a vertical deflection booster designed for monitor and TV applications.
  • Page 29 -29 - 2. Block diagram 3. Refer to table 6 about functions and service data of LA78040’s Pins Model No.: 14LAANZACDC Version: 1.0...
  • Page 30 -30 - Table 2 functions and service data of LA76818A (N101)’s Pins DT890D Multimeter Voltage of Ground Resistance (Ω) Pin (V) Measure with Red Measure with Function Description Probe while black Probe while grounding Black grounding red probe. probe Audio signal output 2.44 /2.28 Audio frequency discrimination output 2.34...
  • Page 31 -31 - DT890D Multimeter Voltage of Ground Resistance (Ω) Pin (V) Measure with Red Measure with Function Description Probe while black Probe while grounding Black grounding red probe. probe Power supply of 1H baseband delay 4.45 circuit Power filter of 1H baseband delay ∞...
  • Page 32 -32 - Table 3 Functions and service Data of LC863432B-54H7 GDM8145 Multimeter Voltage of Ground Resistance (KΩ) Pin (V) Measure with Red Measure with Function Description Probe while black probe while grounding Black grounding red probe. probe Band1 (V-L select /IIC SDA1 for 0~4.5V 3650 control tuner)
  • Page 33 -33 - DT890D Multimeter Voltage of Ground Resistance (KΩ) Pin (V) Measure with Red Measure with Function Description Probe while black probe while grounding Black grounding red probe. probe SD input port 5.1V Remote control signal input 5.1V 3200 3300 Volume-R PWM output port 0~4.5V Volume-L PWM output port...
  • Page 34 -34 - Table 5 Function and service data of LA4285 /LA4287 (N601 and N602)’s Pins DT890D Multimeter Voltage of Ground Resistance (KΩ) Pin (V) Measure with Red Measure with Function Description Probe while black probe while grounding Black grounding red probe.
  • Page 35 -35 - Table 7 Functions and service Data of L7809CV(N551)’s Pins DT890D Multimeter Voltage of Ground Resistance (Ω) Pin (V) Measure with Red Measure with red Function Description Probe while probe while grounding Black grounding black probe. probe Input terminal Stable voltage output 1015 Ground...

  • Page 36: Circuit Adjustement

    -36 - CIRCUIT ADJUSTMENT Item +B adjustment, TV signal receiving Measuring equipment TV SG (Signal generator) Digital multi-meter Preparation before adj. The set is turned on Connect the TV SG to RF input terminal of the set. ADJUSTMENT PROCEDURE 1. Turn RP551 potentiometer to adjust B+ to specified voltage. 2.
  • Page 37 -37 - Item RF. AGC adjustment Measuring equipment SG and digital multi meter service remote control Preparation before Adj. Connect a digital multi meter to TP101 point on the chassis. 1. Receive Philips circular testing signal. 2. Adjust the signal input level to 62db ± 1db. 3.
  • Page 38 -38 - 3. Vertical linearity Receive Philips circular test signal (PAL system). b. Press PROD (FACTORY) button on the maintenance use remote controller to start adjusting mode. Press CH ± button to select V.LINE option. Use VOL ± button to adjust the value of V.LINE till the vertical linearity reaches the best.
  • Page 39 -39 - Item Focus adjustment Measuring Equipment Preparation before Adj. Brightness, contrast and color should be set in standard. Adjustment procedure 1. Receive the cross-hatch pattern signal. 2. Turn the focus adjusting VR watching the screen and adjust the vertical line of mark to make the most thin.
  • Page 40 -40 - Item White balance adjustment Measuring Equipment SG and white balance meter Service remote controller Preparation before Adj. Warm up the set for more than 30 min. Brightness, contrast and color should be set in standard 1. Operation method Adjustment procedure a) Press PROD button to enter into “B/W BALANCE”...
  • Page 41 -41 - In “LINE MODE”, beside MUTE button, the following eight buttons will work, with their function changed as follow. Other buttons will not work. BUTTON FUNCTION Sub brightness + Red bias + Green Bias + Blue Bias + BUTTON FUNCTION Sub brightness - Red bias -...

  • Page 42: Service Mode & Bus Data

    -42 - SERVICE MODE AND BUS DATA 1. User’s remote control unit enabling “FACTORY” button function User’s remote control unit has no “PROD (producer)” button. This may bring troubles to maintenance after TV sets exit the factory. So a substitution “PRO” function is specially designed in the software.
  • Page 43 -43 - Page 2 (MENU 1) FORCE 60HZ Force 60Hz (0: no /1: yes): when select int. signal CROSS B/W INT. signal set (0: normal /1: dark/2: white/3: crose) R-Y /B-Y G.BL Corresponding to R-Y /B-Y GAIN BALANCE option of decoding chip (range: 0~15), normally “8”...
  • Page 44 -44 - Page 4 (MENU 3) 76810 /76818 Decoding chip selection (0:LA76810/ 1:LA76818) POWER OPTION POWER mode upon cold start –up (0:OFF /1:REMEMBER /2, 3:ON) POWER LOGO Power logo option (1: ON /0:OFF) POWER ON KEY Whether use POS+ /POS- and 0~9 to open TV (0:YES /1:NO)Screen option when turning on /off (OFF /P/ON /P.OFF /ALL) BLUE /BLACK Blue or dark background selection while no signal (0:BLUE 1:...
  • Page 45 -45 - Page 6 (MENU 5) AV OPTION AV input number (0~3) S-VIDEO OPT. S-VHS select (0:No /1:Yes) SCART OPTION SCART function (0:No /1:Yes) ONLY AV MODE Only AV mode (0: No /1: Yes) DVD OPTION DVD function select (0: No /1:Yes) DVD OFF TIME DVD off time (0~7s) OFF TRIGGER...
  • Page 46 -46 - Page 8 (MENU 7) ENGLISH OSD Select ENGLISH OS (0: NO /1: YES) RUSSIAN OSD Select RUSSIAN OSD (0: NO /1: YES) TURKISH OSD Select TURKISH OSD (0: NO /1: YES) FRANCE OSD Select FRANCE OSD (0: NO /1: YES) SPANISH OSD Select SPANISH OSD (0: NO /1: YES) ITALIAN OSD...
  • Page 47 -47 - Page 10 (MENU 9) PAL OPTION PAL System option (0: NO /1: YES) N3.58 OPTION NTSC 3.58 system option (0: NO /1: YES) N4.43 OPTION NTSC 4.43 system option (0: NO /1:YES) SECAM OPTION SECAM system option (0: NO /1: YES) COLOR AUTO Automatic color identification function (0: NO /11: YES) 4.5M OPTION...
  • Page 48 -48 - Page 12 (MENU 11) VOL. FILTER VOL. FILTER option (0: off /1: ON) normally 1 is selected VIF.SYS.SW IF setting (0:38.0M /1:38.9M /2:45.75M /3:39.5M) BRT.ABL.DEF. Corresponding to the BRT. ABL. DEF option of decoding chip (0: ON /1: off) MID.STP.DEF Corresponding to decoding chip’s MID.STP.DEF option (0: ON /1: OFF)
  • Page 49 -49 - Page 14 (MENU13) (when select LA76818) Y GAMMA STA Corresponding to the Y GAMMA START option of decoding chip (range: 0~3) DC. REST DC resume (range: 0~7) BLK. STR. STA. Corresponding to the BLK.STR.START option of decoding chip (range: 0~3): normally 2 is selected BLK.STR.GAIN Corresponding to the BLK.STR.GAIN option of decoding chip...

  • Page 50: Trouble Shooting Flow Chart

    -50 - TROUBLE SHOOTING FLOW CHART No raster YE S Check N551 /V554 Check whether the line Check V513 /V512 /V511 /V501 /VD554 /R569 of B6 9V is normal Check VD551 /V551 Check whether the line of B1 110V is normal Check voltage of Check V431 waveform Replace N101...
  • Page 51 -51 - No picture Check the video signal Check N101 /T101 of N101 /46 pin /A101 /N703 Check the video signal Check voltage cross Replace N801 of N801 /13 pin N101 /11 /13 pins Check N701 Check the video signal Check C211 of N101 /42pin Check the video signal...
  • Page 52 -52 - No sound Check waveform Check waveform of N101 /52pin of N101 /52pin Check waveform Check N101 of N101 /1pin Check waveform Check C822 /R834 /R844 of N801 /4pin Check waveform Check N801 on N801 /15pin Check waveform of N601 /N602 /3 Check voltage of Check N601 /N602 N601 /9...

  • Page 53: Part List

    -53 - PART LIST Components Q'TY Parts Location Name & Specification RT13-1/6W-4.7Ω±5% R452、617、627 RT13-1/6W-33Ω±5% R111、243、840、935、936 RT13-1/6W-100Ω±5% R107、241、242、271、275、276、766、770、774、809 R817、818、820、821、902、912、922 RT13-1/6W-220Ω±5% R110、744、745 RT13-1/6W-330Ω±5% R122、127、725 RT13-1/6W-470Ω±6% R517、728、801 RT13-1/6W-560Ω±5% R778、780 RT13-1/6W-680Ω±5% R409、610、620、904、914、924、931 RT13-1/6W-750Ω±5% R906、916、926 RT13-1/6W-820Ω±5% R727＃、802 RT13-1/6W-1KΩ±5% R101、119、121、131、201、232、458、611、612、733 R808、812、814、815、819、932、933 RT13-1/6W-1.2KΩ±5% R109、202、567、804 RT13-1/6W-1.5KΩ±5% R722 RT13-1/6W-1.8KΩ±5% R523 RT13-1/6W-2.2KΩ±5% R401、408、707＃、759、831...
  • Page 54 -54 - Components Q'TY Parts Location Name & Specification RT13-1/6W-82KΩ±5% R732 RT13-1/6W-100KΩ±5% R113、114、VD401 RT13-1/6W-150KΩ±5% R104、700＃、729 RT13-1/6W-270KΩ±5% R726 RT13-1/6W-330KΩ±5% R403 RT13-1/6W-390KΩ±5% R204、709 RT13-1/6W-560KΩ±5% VD402 RT13-1/6W-620KΩ±5% R210 RT14-1/4W-2.7Ω±5% R446 RT14-1/4W-22Ω±5% R519 RT14-1/4W-33Ω±5% R570、940 RT14-1/4W-150Ω±6% R400 RT14-1/4W-470Ω±5% R582 RT14-1/4W-560Ω±5% R581 RT14-1/4W-1.8KΩ±5% R453 RT14-1/4W-2.2KΩ±5% R526 RT14-1/4W-3.9KΩ±5% R565...
  • Page 55 -55 - Components Q'TY Parts Location Name & Specification RY17-2W-10KΩ±5% R491 RY17-2W-12KΩ±5% R551、718、R907、917、927 RY18-3W-56Ω±5% R524 RJ24-1/4W-4K7-1% R273 RI40-1/2W-24MΩ±5% R531！ RF10-1/2W-0.47Ω±5% R569！ RF10-1/2W-1Ω±5% R550！ 、562！ RXG6-5W-3.9Ω-J R471 RXG6-6W-3.9Ω-J R502！ PTC-180HM RT501！ WI06-2AA2KΩ RP551 CC1-06A-CH-50/63V-15pF-J C704 CC1-06A-CH-50/63V-18pF-J C125、705 CC1-06A-CH-50/63V-39pF-J C126 CC1-06A-CH-50/63V-180pF-J C707、911 CC1-06A-SL-50/63V-220pF-J C706 CC1-06A-SL-50/63V-390pF-J...
  • Page 56 -56 - Components Q'TY Parts Location Name & Specification CD110-16V-100uF -M C115、613、614、623、624、631、805 CD110-16V-470uF -M C550、570、933 CD110-25V-220uF -M C612、622 CD110-25V-470uF -M C564、565 CD110-25V-1000uF -M C457、606、582 CD110-35V-47uF -M C434 CD110-35V-100uF -M C451 CD110-35V-330uF -M C452、C563 CD117-50V-0.1uF -M C106 CD117-50V-0.22uF -M C402 CD110-50V-0.47uF -M C137、139、208、401、403、408、934 CD110-50V-1uF -M C117、204、210、211、213、407、713、806、811...
  • Page 57 -57 - Components Q'TY Parts Location Name & Specification LED(RED 5mm) VD701＃ IS1555/IN4148A VD403、514、516、518、562、610、611、612、620、621 VD622、631、901、902、903、911、921、933 FR105 VD517、554、555 GP10D/FR104/IN4004 VD450、451 TVR4N/TRM11C VD503、504、505、506 RGP10J VD412、551 RGP10D VD553 TJ1010 VD552 HZ4A2 VD703 HZ5C1 VD102、580 HZ6C2 VD561 RD5.6EB2/HZ6B1 VD581 HZ7C1 VD519 HZ9A2 VD411 IN4741(11V) VD570 upc574J/CW574/KA33V N705...
  • Page 58 -58 - Components Q'TY Parts Location Name & Specification REMOTE RECEIVER(HS0038/AT138A) A701 TUNER 5V 470M A101(ET-5C1E-EV100K) A-LF011 L501 A-TX0040 21″ T431 Model No.: 14LAANZACDC Version: 1.0...

  • Page 59: Circuit Diagram

    -59 - XS803 XS801-1 XS801-2 XS801-3 AVout R808 R809 C806 R812 COLOUR TV+DVD CIRCUIT 16V10 R807 R814 R815 R836 DIAGRAM(MULTI-SYSTEM) CIRCUIT DIAGRAM R810 R811 R817 V807 R816 R813 1015 V804 C813 C811 R803 1815 4.7K 16V10 C807 16V10 C808 C809 C810 16V10 16V10...

  • Page 60: Exploded View

    -60 - EXPLODED VIEW Model No.: 14LAANZACDC Version: 1.0...
  • Page 61 -61 - Model No.: 14LAANZACDC Version: 1.0...

Table of Contents