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akira 14LA/ANZ, Service Manual

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akira 14LA/ANZ Service Manual Download Page 26

  

   

 

 

 

 

 

 

 

 

                         

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Model No.: 14LAANZACDC
Version: 1.0 

 

   

 
 
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=8

Ω

) LA4285 

  5W (Vcc=22V /RL=8

Ω

) LA4287 

 

2. Diagrams 

 

 
 
 
 
 
 
 
 
 
 

Summary of Contents for 14LA/ANZ

Page 1: ...Colour TV Service Manual...

Page 2: ...2 Model No 14LAANZACDC G Version 1 0 M M Mo o od d de e el l l 1 1 14 4 4L L LA A A A A AN N NZ Z Z A AC C C D D DC C C C C Ch h ha a as s ss s si i is s s S S Sa a an n ny y yo o o S S S0 0 02 2 2...

Page 3: ...ETY 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...

Page 4: ...iation For continued safety replacement component should be made after referring the PRODUCT SAFETY NOTICE below SAFETY PRECAUTION 1 The TV has a nominal working EHT voltage of 24 5KV Extreme caution...

Page 5: ...rotection afforded by them cannot necessary be obtained by using replacements rated at higher voltages or wattage etc Components which have these special safety characteristics in this manual and its...

Page 6: ...holes in the back cover Ventilation is essential to prevent failure of electrical component Do not squash power supply cord under the television receiver If the television is to be built into a compa...

Page 7: ...Neutral detergent is allowed Never use thinner or volatile etc 2 To ensure safety unplug the TV set when cleaning 3 Do not turn on the TV set in thunder days At lightning intervals pull off the power...

Page 8: ...I M B G Video system PAL NTSC3 58 NTSC4 43 50 60Hz VHF C1 C12 UHF C3 C57 Receiving channel CATV Z1 Z37 Programs preset 255 Antenna input 75 unbalanced Audio output 3W THD 7 Power source 150 250V AC 5...

Page 9: ...ription 1 N101 LA76818A Small signal processor 2 N451 TDA9302 LA78040 Vertical output circuit 3 N601 N602 LA4285 LA4287 3W 5W sound power amplifier 4 N701 LC863432B 54H7 System control micro processor...

Page 10: ...hrough multi polarity IF amplifying and PLL sync detecting which then are output in two ways After one set of signal is trapped to eliminate the second SIF signal cored and pre video amplified Pin 46...

Page 11: ...PROCESSOR The video signal processor in LA76818A mainly consist of an AV switch and filtering circuit luminance signal processor chroma signal processing color decoding RGB selection circuit which is...

Page 12: ...esulting in display luminance and color not coinciding A luminance delay line integrated in LA76818A can adjust delay time of the delay line by the I2 C bus so that the luminance and chroma signals re...

Page 13: ...r with high Q value and narrow oscillating range VC02 is an inner oscillator with wide oscillating range Firstly oscillating signals generated from VC02 and VC01 are discriminated in APC2 then the gen...

Page 14: ...cuit for matrix processing to get a G Y signal The three color difference signals are sent to the contrast luminance control circuit together with the Y signal Before sent to the primary matrix the co...

Page 15: ...D911 and VD921 ensuring V902 V912 and V922 end video amplifying triodes conducting for a period of time and high voltage of the CRT discharged quickly through the end amplifying triodes Thus spot is k...

Page 16: ...lume control under the control of the N701 Pin5 Pin6 b Audio power amplifier The audio power amplifier comprises LA4285 for 14S01 The following give descriptions of the circuit on basis of LA4285 An a...

Page 17: ...output in three ways The first set is sent to the AFC1 PLL discriminator to function as a reference phase signal The second set is separated out vertical frequency pulse by the vertical sync separator...

Page 18: ...f signal is a horizontal frequency square wave pulse from the frequency divider functioning as a reference signal for the frequency and phase of the horizontal frequency pulse is locked in AFC1 by the...

Page 19: ...nter the Locking mode Locking mode After identification the CPU provides a narrower range of count comparison value Only when vertical frequency of the received signal changes within a very narrow ran...

Page 20: ...ine drive pulse with of 24 s which is supplied to base of V431 After amplified and pulse shaped by V431 and coupled by T431 the horizontal frequency pulse is supplied to base of V432 R433 and C433 are...

Page 21: ...02 IF Pream plifier SAWF Z101 V705 V431 Line Drive T431 V432 Horizontal Output T471 FBT 115V 180V 25V 13V 20V Video Amplifier Formed of LA78040 N451 Vertical Output LA4285 87 N602 Audio Power Amplifie...

Page 22: ...22 Model No 14LAANZACDC Version 1 0...

Page 23: ...23 Model No 14LAANZACDC Version 1 0...

Page 24: ...ded except IF phase locked VCO coil A buss eliminator is also built in the IC Video PLL detector improves video detection characteristic and picture sound quality greatly Video audio switchover switch...

Page 25: ...25 Model No 14LAANZACDC Version 1 0 2 Block diagram...

Page 26: ...IER 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 outp...

Page 27: ...27 Model No 14LAANZACDC Version 1 0 3 Refer to table 5 about functions and data of the LA4285 s Pins...

Page 28: ...ossover 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 f...

Page 29: ...29 Model No 14LAANZACDC Version 1 0 2 Block diagram 3 Refer to table 6 about functions and service data of LA78040 s Pins...

Page 30: ...line 4 55 1560 640 12 I2 C bus clock line 4 55 1542 667 13 Auto brightness control input 3 8 945 577 14 R character signal input 0 9 0 920 714 15 G character signal input 0 94 0 913 701 16 B character...

Page 31: ...0 706 38 4 43MHz crystal oscillator connector 2 8 790 716 39 APC filter 2 5 760 697 40 Video signal output 2 3 730 662 41 Video chroma scan part ground 0 0 0 42 Video signals input from AV terminals o...

Page 32: ...5 1V 10 10 9 Key in port 0 3 6V 10 10 10 AFT signal input port 2 38 49 49 11 SCART detection no used to 1 5V 10 10 12 SECAM detection no used to 0 0 5V 6 5 6 5 13 CPU reset port 5 1V 4 6 4 5 14 OSD f...

Page 33: ...00 3700 34 AV option control port 1 0 5V 3000 3700 35 DVD trigger 50 60 control when no select DVD 5 1V 3000 3700 36 DVD on off UHF select when no select DVD 5 1V 3000 3700 Table 4 Functions and servi...

Page 34: ...9 75 6 Filter 9 28V 14 04 4 94 7 Negative feedback 9 28V 33 5 28 79 8 Power ground 0V 9 Output 10 3V 38 9 38 3 10 Vcc 23 6V 0 49 Table 6 functions and service data of LA78040 STV9302 N451 s Pins DT890...

Page 35: ...9CV N551 s Pins DT890D Multimeter Ground Resistance Pin No Function Description Voltage of Pin V Measure with Red Probe while grounding Black probe Measure with red probe while grounding black probe 1...

Page 36: ...work 13 1V Audio power out 19 1V 3 TV signal receiving a Press MENU key to select PRESET item Press V or V key to select SEMI SEARCH or AUTO SEARCH item press P key to start searching b Press P or P t...

Page 37: ...color should be set in standard 1 Vertical size adjustment a Receive Philips testing PAL system signal b Press PROD factory button to start adjusting mode c Press CH button to select V SIZE option us...

Page 38: ...SG The picture and sound must be normal 3 Press TV AV key to select AV input The picture and sound must be normal 4 AV output inspection Load a 75 resistor to VIDEO output terminal 1 Vp p video output...

Page 39: ...ent 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 Then the focus adj VR is set as clos...

Page 40: ...ectly the option to be adjust 2 Adjustable items table OSD DISPLAY CORRESPONDING LA76818 BUS ITEMS NAME RANGE VARIABLE S BRI Sub Brightness Sub Brightness 0 127 R BIA Red Bias Red Bias 0 255 G BIA Gre...

Page 41: ...signal PAL system 2 Use PROD FACTORY button to enter into adjusting mode 3 Press CH button to select OSD H POSI option Use VOL button to adjust the value of OSD H POSI till the characters appear in t...

Page 42: ...ptions consist of 13 pages from MENU 0 to MENU 12 All the adjusting menus will be available During practical manufacturing most of the options are preset in a mother chip Products of the same batch on...

Page 43: ...5 normally 8 is selected YUV B Y DC 8 B Y DC setting for YUV range 0 15 available only if LA76818 is used YUV R Y DC 8 R Y DC setting for YUV range 0 15 available only if LA76818 is used Page 3 MENU 2...

Page 44: ...LY OPEN 2 ONLY CLOSE 3 BOTH SCREEN TIME Black background time interval before drawing curtain 0 7 seconds SCREEN TYPE Screen mode 0 begin from middle normally 1 wateriness act Page 5 MENU 4 TUNER OPTI...

Page 45: ...de DVD PORT DEF DVD port setting 0 last way AV second way to back Page 7 MENU 6 GAME OPTION Game function option 0 NO 1 YES CALENDER Perpetual calendar option 0 NO 1 YES ZOOM OPTION ZOOM function opti...

Page 46: ...RAB OSD Select ARAB OSD 0 NO 1 YES Page 9 MENU 8 STEREO OPT Stereo option 0 INT 1 one way PWM 2 two ways PWM 3 LV1116 LV1116 GAIN LV1116 gain select 0 6dB 1 4dB 2 0dB 3 4dB 4 7 6dB SUR MODE LV1116 sur...

Page 47: ...PUP option of decoding chip 0 low 1 high normally select 1 VIDEO LEVEL Corresponding to the VIDEO LEVEL option of decoding chip range 0 7 normally 7 is selected FM LEVEL FM LEVEL option of decoding ch...

Page 48: ...to the C VCO ADJUST option of decoding chip 0 1 when select LA76818 C VCO ADJ Corresponding to the C VCO ADJUST option of decoding chip 0 0Hz 1 30Hz 2 60Hz 3 90Hz when select LA76818 Page 13 MENU12 w...

Page 49: ...ected BLK STR GAIN Corresponding to the BLK STR GAIN option of decoding chip range 1 3 normally 2 is selected A MONI SW Corresponding to adjusting option A MONI SW 0 1 of the decoding chip normally 0...

Page 50: ...k whether the line of B1 110V is normal Check VD551 V551 Check V431 waveform normal or not Check filament voltage Check B3 190V line Check horizontal output transformer V431 V432 V902 V922 Check R491...

Page 51: ...gnal of N101 42pin Check C211 Check the video signal of N101 17pin Replace N101 Check N101 T101 A101 N703 Check voltage cross N101 11 13 pins Check N701 Replace N801 Horizontal raster no vertical scan...

Page 52: ...rm on N801 15pin Check waveform of N801 4pin Check C822 R834 R844 Check N101 Check waveform of N601 N602 3 Check voltage of N601 9 Check N601 N602 Check C622 C632 B901 B902 No color Check relevant set...

Page 53: ...W 1K 5 17 R808 812 814 815 819 932 933 RT13 1 6W 1 2K 5 4 R109 202 567 804 RT13 1 6W 1 5K 5 1 R722 RT13 1 6W 1 8K 5 1 R523 RT13 1 6W 2 2K 5 5 R401 408 707 759 831 RT13 1 6W 2 7K 5 2 R705 900 RT13 1 6W...

Page 54: ...W 150 6 1 R400 RT14 1 4W 470 5 1 R582 RT14 1 4W 560 5 1 R581 RT14 1 4W 1 8K 5 1 R453 RT14 1 4W 2 2K 5 1 R526 RT14 1 4W 3 9K 5 1 R565 RT14 1 4W 15K 5 1 R522 RT14 1 4W 22K 5 1 R556 RT14 1 4W 51K 5 2 R55...

Page 55: ...0pF J 2 C901 921 CC1 06A SL 50 63V 470pF J 3 C121 771 772 CT1 06A 2B4 50 63V 1000pF K 1 C123 C102 110 111 112 116 118 119 122 205 245 C274 275 277 279 405 556 568 571 583 607 CT1 06A 2F4 50 63V 0 01uF...

Page 56: ...13 407 713 806 811 CD110 50V 4 7uF M 2 C456 708 CD263 160V 4 7uF M 1 C444 CD110 160V 10uF M 1 C565 CD110 160V 100uF M 1 C561 CD110 250V 10uF M 2 C562 904 CD293 400V 100uF 10 1 C507 CL11 50V 63V 2200PF...

Page 57: ...VD519 HZ9A2 1 VD411 IN4741 11V 1 VD570 upc574J CW574 KA33V 1 N705 LA4287 5W 2 N601 602 TA78M09 9V 1 N551 LC4053B CD4053B 1 N801 LC863532B 54H7 1 N701 LA76818A 1 N101 LA78040 STV9302 1 N451 BR ST24C08...

Page 58: ...58 Model No 14LAANZACDC Version 1 0 Components Name Specification Q TY Parts Location REMOTE RECEIVER HS0038 AT138A 1 A701 TUNER 5V 470M 1 A101 ET 5C1E EV100K A LF011 1 L501 A TX0040 21 1 T431...

Page 59: ...2 1K C805 16V470 C808 16V10 R808 1K R807 10K C806 16V10 C807 16V10 R812 1K R811 10K C810 16V10 R815 1K R816 10K C809 16V10 R814 1K R813 10K XS803 AV1 B9 9V C801 16V220 C802 0 01 R818 100 XS801 2 AVout...

Page 60: ...60 Model No 14LAANZACDC Version 1 0 EXPLODED VIEW...

Page 61: ...61 Model No 14LAANZACDC Version 1 0...

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