Ch.8821_21LAS1 2SC4429 TMP8823CPAN
Contents
1. HITS Vertical amplitude deflection of 60Hz VLIS Vertical line deflection of 60 Hz SECAM R Y Black 0 00 00 00 68 STBY VCDAFSTANDBY O 60 SVM IISYM 00 _ 70 VBLK VBLKStar Stop 00 7 UCOM Miciom Control 00 80 PYNN 9 FacoryDaa B 84 0005 FOR YebCrGCUTOFF 0 86 GDRVS FORYcCrGDRIVE 7 0 87 BDRVS FOR YcbCrB DRIVE 00 899 AKBOPTIIN O 90 AV OPT 06 Model No 21LAS1Bn Version 2 0 26 makes life better Adjustment Function Type Data Factory Data 02 When Mute off VolATT up step number 04 Factory Data 19 Factory Data 03 OSD width 53 OSD position O 1 Factory Data 00 E 02 04 03 53 10 E NOTE The data provided in the form provides to consult only Model No 21LAS1Bn Version 2 0 27 makes life better 28 ELECTRICAL PARTS LIST PRODUCT SAFETY NOTE Products marked with a have special characteristics important to safety Before replacing any of these components read carefully the product safety notice in this service manual Don t degrade the safety of the product through improper servicing NOTE parts that not assigned part numbers are not available Tolerance of Capacitors and Resistors are noted with the following symbols D 405 0 R206 R207 R208 R210 R217 R218 R219 R220 R231 R2922. A14T02 Figure 3 shows the system control circuit of A14T02 Table 1 A14T02 mainly ICs and functions N204 TMPAS803 23 21 Micro controller and small signal processor UOC N901 ST24C16 W EEPROM 701 LA4267 Sound power amplifier N402 LA78040 Vertical scan output stage circuit N203 LC4053B CD4053B AVI AV2 Switch Model No 21LAS1Bn Version 2 0 makes life better Y IN Cr IN AUDIO AMPLIFIER 700 SP701 CN N701 LA426 HA 169 VIDEO IN2 VIDEO or AUDIO Gi AUDIO IN2 AV1 AV2 SWITH AUDIO IN SP702 VIDEO INI S N203 CD4053 VIDEO IN 169 AUDIO INI 12 TRADE VIDEO OUT 444 AUDIO OUT V202 HF TUNER IF PRE AMP CRT A101 V101 TOSHIBA UOC V BANDI BAND2 V Y p TMPA8803 21 23 REMOTE INPUT FIELD OUTPUT POWER AMP REMOTE lots KEY BOARD RECEIVER N901 E A901 ST24C16 8 HORIZONTAL HORIZONTAL FBT T402 DRIVE OUTPUT BSC23 V444 V411 POWER SUPPLY 19V AC150 260V Resistance Bridge CIRCUIT disturbance rectification V512 V513 V511 24V C501 L502 VD503 VD506 T501 VD515 146V 114V Model No 21LASIBn Version 1 0 makes life better 6 SAFETY INSTRUCTION WARNING BEFORE EXAMINING AND SERVICING THIS CHASSIS READ CAREFULLY THE FOLLOWING SAFETY INSTRUCTIONS X RAY RADIATION PRECAUTION 1 The EHT must be checked every time the receiver is serviced to ensure that the CRT does not emit X ray radiation as result of e
3. AGC adjustment Item AKTP01 02 chassis Measuring SG and digital multi meter Equipment No 5 service remote controller Preparation na before Adi Connect a digital multi meter to TP101 point on the chassis Adjustment procedure 1 Receive the color bar signal that is 87 5 modulation and 60dBu level 2 Press RF AGC key on No 5 service remote controller to select RF AGC adjustment press or key to adjust the voltage of RF AGC to 6 2 0 05V that is read on the digital multi meter Vertical height linearity and Hor position adjustment Item AKTP01 02 chassis Preparation before Adj Brightness contrast and color should be set in standard Measuring SG Equipment No 2 and No 3 service remote controllers Model No 21LAS1Bn Version 2 0 makes life better 11 Adjustment procedure l Receive the 5 circles pattern signal that is 50HZ vertical frequency 2 Press V LINE V SIZE V CENT and H CENT key on NO 2 service remote controller respectively to select the vertical linearity height center position and horizontal center position adjustment and then press or key to adjust the value of them respectively according to factory s specification 3 Receive the 5 circles pattern signal that 15 60HZ vertical frequency 4 Press V LINE V SIZE V CENT and H CENT key on NO 3 service remote controller separately to adjust the vertical linearity height center and horizontal center as above item 3 OSD position adjustme
4. L 5mm PUSH SW L 5mm PUSH SW L 5mm 8 0M 20P 37SX110Y22 DC05 36 AKIRA makes life better CIRCUIT DIAGRAM ups 21004 NSDI 101 TUNER am OB BR 25 AUDIO NO LI Lp unn fra 16V 470L 6104 5 fon 5946 gt xo lev saw E a 247 16V 47u T 5010 1 x ves 16 4 2 Z BESE R553 25 945 de cae CC45 R249 SSEK AV BDARD alc gt vesa gt nov 9502 mes 1500 pps K 22 ES E ZA cl 9903 gt i EZB R913 caps T908 prali 5 945 33K 2000 62908 10K JOK pe SET ISK iz 01001 LEDRED X71001 1001 5 1 z REJE 270 C242 vios 25 945 51 Pa REMIS 48 RAMEkE ROM correction 055 R 6 3 Ys 1 FontdExig 125010 VI3 CX1CL Color P Chrono Proc RGE switch PAL NTSC Brightness TINT HaiF tone Transparent 1 8 15 1 6 port l4 blt xi Charnctenri3B4 Fees Haif tone swa s Transparent sesta swa 4 D SEK V de MEN ADE Poet aa ABBCICPNGARJI Bass Band Proc Black strectch PAL NTSC demod R707 Ronote preprocessor DL Int Ext switch Y gomme UTE VE 5 4 15K int tner xE 879X CPU core tcn Colo
5. 5 5V Deflection coil CPU has sent the Check if V572 Model No 21LAS1Bn Version 1 0 Power off signal is broken down makes life better 14 2 B Two None no picture no sound The failure shows that the set does not display the picture but it has noise wave or blue background or OSD on the screen This means that the circuits of power supply horizontal scanning vertical scanning and video amplification are normal and they are not considered in the repairing The failures are mainly in the small signal processing circuits Before checking these circuits a kind of practical test method is introduced It is called Signal input way The detail is described as follow We can use the resistance function of an analog multimeter connect the red pole negative in ohm scope on the circuit board ground then touch softly the test point with another pole black pole in ohm scope meanwhile observe the reactivity on the output device Note In the TV test we mainly observe the noise wave on the CRT and listen to the noise voice liking as Ka Ka from the loudspeakers a No picture see the diagram on next page Model No 21LAS1Bn Version 2 0 Test the voltage on pin 17 29 4901 M204 NO Check if A101 has input signal Check R553 N904 C926 YES Out of 0 33V range 33V Check RF signal input and adaptor Check the VT voltage when auto searching The voltage on the C926 In the 0 33V range 33V Un No v
6. NO Check R236 R237 R238 V601 V611 V621 N204 makes life better Model No 21LAS1Bn Version 2 0 16 No sound In this kind of failure first of all we should observe if there is the picture on the CRT It proves the small signal circuit to work correctly with the picture on the CRT and we only check the sound signal processing and sound amplification circuit The repairing method B1 may be referred without picture The detail checking and repairing steps are as follow Note Before repairing assure that the volume is on and the state of set is in TV Please see the diagram on next page makes life better YES Hear if there 15 the voice liking Ka Ka in the loudspeaker via using Signal input way by touching pin 31 of N204 YES Hear if there is the voice liking Ka Ka in the loudspeaker via using Signal input way by touching pin 28 of N204 Check R202 C202 N204 NO Check C103 R706 C703 N204 XES Hear if there is the voice liking Ka Ka in the loudspeaker via using Signal input way by touching pin 13 of N203 Check C292 R293 N203 NO Check 9V power supply YES YES Hear if there 15 the voice liking Ka Ka in the loudspeaker via using Signal input way by touching 12 of N203 9V Check W214 VD216 R216 R294 N203 NO The voltage on pin 16 of N203 Hear if there 1s the voice liking Ka Ka in the loudspeaker via using Signal input way b
7. 0 A WESSE m esini 583 7 C535 BE RGPI5D 2927 SA JE EN C2 PSUVAC IQU0p 16V 100u 3 rou i D 1 1 24W 9449 gt sra ES Vars T M902 1 R 50 7 Bu 5w 3 5 C56 gt 929 25C54 470 160W 10 I 1690 C571 VPS21 cope visez 16V 476u 6871004 BW NOTICE SINCE THIS IS A BASIC CIRCUIT DIAGRAM THE VALUE DF COMPONENTS ARE SUBJECT TO BE CHANGED FOR IMPROVEMENT CAUTIDN THE COMPONENTS WITH A IN THE SCHEMATIC DIAGRAM WHICH HAVE SPECIAL CHARACTERISTICS IMPORTANT FOR SAFETY SHOUD BE REPLACED ONLY WITH TYPE IDENTICAL TO THOSE IN Model No 21LAS1Bn Version 2 0 vens 25 945 1364 Pr THE OGIGIAL 95607 L LI 25 C603 iu f u ibW Hv __ E E us OK R424 Y 15Kk CIRCUIT 100 RSDB 15K R616 y 1 ponis K RED 2SAI DIS Re25 Li 172W ASK Rees Ti 71 REDE 1 C M OK 9595 C 1W712K A Pol wnelj Z3 XEEN 101019 A MAIN BDARD Er IM Clo IN VIDED IN AUDIO INCL AUDIO INO A VERT EDIL 37
8. AKIRA makes life better Colour TV Service Manual makes life better Model Group 21LASI CHASSIS 8521 MODEL 21LAS1 BN makes life better 3 CONTENT GENERAL DESCRIPTO U ts 4 RS 5 lt lt _ _ _ _2232232 2 222 2 23 2 ___ CIRCUIT ADIUSTNIBINTS 6 FAULT FINDING TREES DIAGRAMS AND OVERVIEWS 12 VARIOUS PARAMETERS OF INTEGRATED CIRCUIT 25 DATA FOR TIMP AS S03 25 ELECTRICAL P RE E 28 NI 37 Model No 21LAS1Bn Version 2 0 makes life better 4 GENERAL DESCRIPTION 1 02 chassis series are applied A14T02 A14T02a respectively which uses mainly TOSHIBA advanced UOC ultimate chip TMPA8803 8821 and controlled IC With combination of micro controller and small signal processor the TMPA8803 8821 series feature high integration high performance to price ratio and high reliability and advanced functions with fewer external components which provide much convenience for manufacturing and technical service Figure 1 shows the block diagram of 01 A14T02 Table 1 provides A14T02 mainly ICs and functions Figure 2 shows the whole set power supply system for AKTP01
9. G to RF input terminal of the set Model No 21LAS1Bn Version 2 0 makes life better ADJUSTMENT PROCEDURE 1 Turn RP551 potentiometer to adjust B to specified voltage 2 Check voltages for video out vertical out circuit work and audio power out as follow Voltage volt Tolerance 14 14 inch o 21 21 a ACUM EA 3 signal receiving a Press MENU key to select POS MEMORY item Press V or V key to select SEARCH or AUTOMEMORY item press P key to start searching b Press P or P key to inspect the set if there is channel skipped if so searching again by SEARCH as above described TV system adapting amp AV 1n output inspection Item AKTP01 02 chassis Measuring SG with NTSC3 58 User remote controller Equipment Dual trace oscilloscope Preparation before Adj Input TV and AV signal Model No 21LAS1Bn Version 2 0 makes life better 9 Inspection procedure 1 Input the TV signal which system is designated in technical specification 2 Switch TV system to the set by pressing SYS key on user remote controller according to the TV system in 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 75Q resistor to VIDEO output terminal 1 Vp p video output signal that is from TV signal should be observed on the oscilloscope Load a 10K resistor to AUDIO output terminal 0 7Vp p audio output si
10. II VSS GND connection 14 HAFCI Terminal To be connected capacitor for AFC filter V saw Terminal To be connected capacitor to generate V saw signal _ 17 HVee Vec terminal for DEF circuit 18 NC SECAM o 22 TVGND GND terminal for Digital block 25 TVDVce Vec terminal for Digital block 29 IFVec9V Vec for terminal for IF Circuit S SIF Det output 35 PIFPLL Terminal to be connected with loop filter for PIF PLL M mo PI VCO gem 36 IFVec5V Vec terminal for IF circuit Supply SV U 37 RegFil Terminal to be connected capacitor for stabilizing internal bias 38 Deempha Terminal to be connected capacitor for SIF Det De Emphasis 39 IFAGC Terminal to be connected with IF AGC filter LU 40 IEGND GND terminal for IF circuit 00 2 Input terminals for IF signals 43 Output terminal for RF control leve 44 TVYCVcc Vec terminal for Y C circuit Supply5V U Model No 21LAS1Bn Version 2 0 makes life better 24 Pin Symbol 10 Function gt I 46 BlackDet Terminal to be connected with Black Det filter for black stretch 47 Chroma PLL Terminal to be connected with APC filter for chroma demodulation 48 49 RGB Vec Voe terminal for RGB circuit Supply5V 50 51 52 53 TV AGND GND termin
11. R301 R305 R306 R323 R609 W214 R201 Model No 21LAS1Bn Version 2 0 makes life better 29 R205 R240 Model No 21LAS1Bn Version 2 0 makes life better 30 Model No 21LAS1Bn Version 2 0 makes life better 3 R247 R531 GlassrGlazed Fixed RES RI40 1 2W 24MQ 5 Model No 21LAS1Bn Version 2 0 makes life better 32 Model No 21LAS1Bn Version 2 0 makes life better 33 Model No 21LAS1Bn Version 2 0 makes life better 3 1501 LMXX0002 Degausingcol J Model No 21LAS1Bn Version 2 0 K makes life better 3 N24 lc TMPASROCPANGGV Model No 21LAS1Bn Version 2 0 makes life better Ref No V552 V101 V601 V611 V621 V444 V512 V501 V102 V103 V201 V202 V203 V231 V551 V571 V572 V701 V901 VALI V905 Z304 7302 ZI SAWF F501 41001 101 SW1001 sw1002 sw1003 SW1004 sw1005 SW1006 Z901 Model No 21 LASIBn Version 2 0 Specification 2SB892 2SB985T 28C2216 28C2482 28C2482 28C2482 28C2383 O 28C3807 28C5070 2501710 25 4584 5586 28C945 28C1815 28C536E 28C945 28C1815 28C536E 28C945 28C1815 28C536E 28C945 28C1815 28C536E 28C945 28C1815 28C536E 28C945 28C1815 28C536E 28C945 28C1815 28C536E 28C945 28C1815 28C536E 28C945 28C1815 28C536E 28C945 28C1815 28C536E 28C945 28C1815 28C536E 28D2499 28D1651 25D400D XT6 0M XT5 5M 1339 38 9M 2 5A 250V HS0038 TDV 357 9 470M PUSH SW L 5mm PUSH SW L 5mm PUSH SW L 5mm PUSH SW
12. al for Analog block 54 VSS comection o Z SSS O 60 VT VTouput B Pin functions of N701 LA4266 67 Pin Symbol WO 2 3 Filter Muteimput 4 PREGND I 6 INE 8 PowrGND 9 Powersupply C Pin functions of 02 1 478040 Pin Symbol 10 Function O 2 VCC Powersupply 202 3 PUMPUP Pumpupot 0 A GND oo o vv v O 6 VCC Output stage VCC Model No 21LAS1Bn Version 2 0 makes life better THE BUS DATA FOR TMPA8803 No Adjustment Adjustment Function Type Data Item 1 5L 72 7 3E TF 7 40 40 40 10 I 40 12 07 13 14 50 15 COIN Subcolormn 00 34 CLTO The data when TV mode amp Sound SYSI M 0B 3 AKB 90685X 00 4 HPOS Horizontal center of 50 Hz Vertical centering of 50 Hz 06 Vertical amplitude of 50 Hz Horizontal centering difference of 60 Hz Vertical centering difference of 60 Hz Model No 21LAS1Bn Version 2 0 22 makes life better Item 47 VI Vertical line of 50 Hz 0B i 0 50 VSS Vertical S correction 60 Hz 00 Sl SBY SECAMB YBlak 08 08 55 BRTS Sub bright difference 00 55 HAEC X j AFCgin 09 59 MUTT Y MUTE SOFT START 00 60 STAT CONTORASTUPFORSOFTSTART 00
13. ariation Check N902 A101 Check the 9V voltage on A101 Check the voltage on the C923 0 33V SV Check R102 C104 A101 Check V102 V 103 R928 R930 si The voltage between VL and BH vary from N204 A101 0V to 9V or not when auto searching Check V901 N204 R909 R902 2V R903 R913 C912 C908 C909 Exam the voltage of on A101 without antenna Check R119 R213 RIOLCIOLAIOLN204 pun C230 L230 9V Check L305 C311 L302 C302 L204 C238 0V Check N902 M204 L901 C914 R327 C307 Test the voltage on pin 25 9 36 44 of N204 L201 C209 5V YES Observe if there is snow noise wave disturbance on the CRT via using Signal input way by touching pin 41 and pin 43 of N204 Check N902 L302 N204 YES Observe if there is snow noise wave disturbance on the CRT via using Signal input way by touching pin 30 of N204 NO YES Observe if there is snow noise wave disturbance on the CRT via using Signal input way by touching pin 35 of N204 Check R211 R201 C203 C204 NO Observe 11 snow noise wave disturbance on the CRT via using signal input way by touching pin 26 of N204 YES NO YES Test 1f there 1s the sync signal on the pin 12 of N204 Check V203 V302 L304 Z304 C301 NO Check R321 VD436 T402 R462 C452 Check if voltage on pin 39 of N201 is 1 7V Check C205 A101 N204 Observe if these is snow noise wave disturbance on the CRT via using Signal input way by touching pin 50 51 52 of N204
14. e of the screen This is a dangerous failure It probable causes flashover and smoking inside the set Don t let your TV work for a long time as this failure appears Because the electron beam can not move in the horizontal orientation the failure should be in the horizontal deflection circuit We mainly check the open circuit fault in horizontal deflection circuit The detail checking and repairing steps are as follow The horizontal yoke is opened or not NO Whether XZ411 is opened NO Check 1f there 1s bad solder between XZ411 and the main board Check L414 VD403 C412 C415 especial in inductive components and connector YES Repair CRT e UOC does not work In television remote control system 1s similar with the computer system In theory it can work if it holds two conditions as follow 1 The power supply In general it is SV the error is not above 10 and the disturbance pulse is as small as possible 2 The clock pulse In TMPA88XX circuit the clock pulse is generated by pin6 pin7 of N204 and 8M crystal oscillator Television s remote control system also needs reset circuit that can preset the values in internal register The circuit around pin6 of N204 is called auto reset circuit If UOC detects errors in resetting it will come to the state of programme protected The detail checking and repairing steps are as follow Model No 21LAS1Bn Version 2 0 makes life better 21 N204 does not work The
15. gnal that is from TV should be observed on the oscilloscope Focus adjustment Item AKTP01 02 chassis Preparation before Adj Brightness contrast and color should be set in standard Equipment 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 Then the focus adj VR 15 set as close low voltage side as possible Stop the focus adj VR at the point that focus 15 a bit worse at once turn back to the left and then turn back to the right a little again gt d To be fine H line V line Magnified dravving 01 part O Model No 21LAS1Bn Version 2 0 makes life better 10 White balance adjustment Item AKTP01 02 chassis Preparation Warm up the set for more than 30 min before Adj Brightness contrast and color should be set in standard Measuring SG and white balance meter Equipment M0 1 service remote controller Adjustment procedure 1 Receive the monoscope pattern signal 2 Press G G DRIVE key and B B DRIVE key on M0 1 service remote controller to select G DRV and B DRV respectively then press or key to adjust the white balance at the directed value which is according to the specification of factory s adjustment 3 Press R or R G or G and B or B key respectively to adjust the white balance of low light until the white balance of high and low light is good RF
16. nt Item AKTP01 02 chassis Measuring No 1 and No 5 service remote controller Equipment Brightness contrast and color should be set in standard before Adj Adjustment procedure 1 Press D MODE key on No 1 service remote controller to set the set into design mode adjustment 2 Press 4 key to select OSD item press q key to adjust the OSD to the center position on the screen or press RF AGC key on No 5 service remote controller and press or key to adjust the OSD position 3 Press D MODE key again to quit design mode adjustment The functions of the set inspection Item TD46 chassis Measuring SG Equipment User remote controller and No Preparation Inspection procedure 1 Receive the Philips pattern signal 2 Press PIC key on user remote controller to call the menu as adjusting picture quality Adjust color brightness contrast sharpness and tint in NTSC respectively and all adjustment should be right 3 Press V key to increase the sound volume no distortion heard at maximum level press V key to decrease the sound volume no sound heard at minimum level 4 Press POWER key to switch the set into standby status at mean time the manufactory adjustment mode is cancelled 5 Press POWER key again the set should work in normal receiving mode 6 Press K mute DISP display PP and SLEEP key respectively the relevant function should be normal 7 Press S OUT key on No 5 ser
17. ny tester for the sake of safety The power of the separation transformer should be beyond rated overall power 4 Whenreplacing a burnout fuse use the one with the same specifications as the original 5 When replacing old wire wind new one round the shaft to weld When replacing components with safety in performance use the same type as that specified by AKIRA and install it in the former way 6 Never place wire near high temperature or high voltage components SAFETY CAUTIONS FOR PRODUCTS Many electric and mechanical components in AK TP01 02 chassis have special safety performances which are always neglected Even if replacing them with some components with the same voltage and power you can not get effective protection to X ray In the circuit diagram these special electric components are indicated by the special mark N and on the shadow When replacing any of them use the one with the same specifications as the original s Otherwise it may cause X ray radiation and damage to overall safety Model No 21LAS1Bn Version 2 0 makes life better 7 CIRCUIT ADJUSTMENTS GENERAL INFORMATIONS All adjustment are thoroughly checked and corrected when the receiver leaves the factory Therefore the receiver should operate normally and produce proper color and B W pictures upon installation However several minor adjustments may be required depending on the particular location in which the receiver is operated This receiver is ship
18. ped completely in carton Carefully draw out the receiver from the carton and remove all packing materials Power cord into a convenient 220 volts 50 Hz AC two pin power outlet Turn the receiver ON Check and adjust all the customer controls such as BRIGHTNESS CONTRAST and COLOUR Controls to obtain natural color or B W picture AUTOMATIC DEGAUSSING A degaussing coil is mounted around the picture tube so that external degaussing after moving the receiver is normally unnecessary providing the receiver is properly degaussed upon installation The degaussing coil operates for about 1 second after the power to the receiver is switched ON If the set is moved or faced in a different direction the power switch must be switched off at least 30 minutes in order that the automatic degaussing circuit operates properly Should the chassis or parts of the cabinet become magnetized to cause poor color purity use an external degaussing coil Slowly move the degaussing coil around the faceplate of the picture tube the side and front of the receiver and slowly withdraw the coil to a distance of about 2m before disconnecting it from AC source If color shading still persists perform the COLOUR PURITY ADJUSTMENT and CONVERGENCE ADJUSTMENTS procedures ADJUSTMENT MODE 8 adjustment TV signal receiving Item AKTP01 02 chassis Measuring TV SG Signal Generator Equipment Digital multi meter Preparation The set is turned on Before Adj Connect the TV S
19. r Uni colpr Sharpness allgnnent 4 B bit int timer STOP IDEL mode RGB Matrix v C Watchdog timer nia Sw O 65254 HC bus Interface Extxi Her Proc Vert Proc vn sepa VED TV AV C Hor 1 H shift R953 rive ME SA gt og k c C913 C914 L 1 18V 47u 50V 3900 VID436 102 402 1 78040 OUT STAGE Vce 701 165 pa SP702 Ct C708 Roca gt 85 05 160hm 1 3900p 2 7K 15V 180 OS vnesi o ee E 1N4148 2700 SEK C705 1H4148 Re45 47 N BK 5 C444 C555 35v 100u VISIS HE ZA prej7a 0505 IKV 1000p R450 R447 47K ISK 2 2u Casa 3 page 185V 10004 TT RAS C563 9565 RESEN LX 37 unaoa pera V D505 TVRANZA 160v 100n 556 Ne mm DEGAUSSINS COIL 5 470p N o 47K 6 RSS II 5559 RP Fe n SKU TT 35V7330V eS ae con hi dria NRS57 Zee 200V 0 29u ESDVAC O BBUF BIK FR105 RESO 84 HORIZONTAL 3 rsot 1 ziv V444 ESDP439 n SASA 2SOV 2SC2383 T401 R320 ie at m ER biu c ES pm K case 407 i 415 172 0 47 150 nev 403 16KV 5100p gt s ESV 4706 74 505 9437 C43
20. vice remote controller to set default value that stored in EZPROM on the chassis for product shipment Model No 21LAS1Bn Version 2 0 makes life better 12 FAULT FINDING TREE DIAGRAMS AND OVERVIEW 1 Three None no raster no picture no sound This failure is mainly caused by big power circuit such as power supply horizontal scanning vertical scanning The detail checking and repairing steps are as follow Model No 21LAS1Bn Version 2 0 makes life better 13 130V 0V Test the voltage of C561 50V 115V 300V Voltage of C507 Cut off R449 N204 pin17 voltage Check NO R552 V551 VD551 OV NO 9V VD515 V511 Check if V501 collect emitter Test other voltag ee V512 R555 146V 24 and 12V Was broken down N204 pin13 voltage LOW Others Check R502 F501 power Check the voltage V551 VD551 RP551 V552 2V YES Check Z901 C901 Swich AC cord and plug of V501 collector VD517 V572 V511 C902 N204 OV V444 pin C voltage 300V IV Check Test voltage of V501 base 115V Recover R449 unplug Check R320 V444 V0553 0559 0 CV na XZ411 fora While then m 1R437 C430 T401 test the voltage of C561 thers 415 411 Check Check if it get right No variation T501 VD517 When cut off V572 Check V 501 Check V411 pin C voltage C515 C517 V411 Check V411 T402 T401 221 YES Deflection coil 115V C415 C418 T402 Test the voltage of N204 pin64 CAL pin Check T402 V411 R449 Check T402 Check L414 VD403 C411 4 5
21. voltage on the pin 55 of N204 Observe 1f there 1s sine wave on the pin 6 or pin 7 Check the voltage on the positive pole of C927 5V SV Of N204 with an oscilloscope 5V Check 7901 N204 YES Check alternant voltage on secondary coil of T501 YES NO TOM Check the voltage on the pin 5 of N204 oo Check T501 VD553 R558 Check R574 VD922 Check N204 Check the voltage on the emitter of V902 4 08V 4 98V Check R941 Check the voltage on the positive pole of VD902 4 98V 3 6V Check VD902 R947 Check R946 R945 V902 Model No 21LAS1Bn Version 1 0 makes life better NO Model No 21LAS1Bn Version 2 0 Check FBT T402 22 No OSD On Screen Display This failure is usually cause by the circuit of character generated and located Most of reasons are that the horizontal and vertical flyback pulse signals do not come to UOC We can judge this failure by measuring the wave of the character in an oscilloscope The detail checking and repairing steps are as follow Check the wave on the pin 4 of FBT Check C452 R462 VD436 R321 N204 makes life better 23 VARIOUS PARAMETERS OF INTEGRATED CIRCUIT A Pin functions of N204 TMPA8803 23 21 Pin Symbol BANDI BAND data output 1 4 1 98 connection 05 6 8MHzoscillatorconnecting U U 8 TEST GNDeoonnection 9 VDD In 5 0 10 vss GND connection ______________________
22. xcessive EHT voltage The nominal EHT for this receiver is 22KV at zero beam current minimum brightness operating at AC 220V The maximum EHT voltage permissible in any operating circumstances must not exceed 25K V When checking the use the High Voltage Check procedure in this manual using an accurate EHT voltmeter 2 Theonly source of X RAY radiation in this receiver 19 the CRT To prevent X ray radiation you should use the same type of CRT when replacing it 3 Some components used in this receiver have safety related characteristics preventing the CRT from emitting X ray radiation For continued safety replacement component should only be made after referring the Product Safety notice below SAFETY PRECAUTION 1 The high voltage in the TV reaches to 22K V when the TV is in operation Be more careful during opening the back cover a The high voltage existing in the TV is very dangerous Refer servicing to qualified personnel only b Before removing the high voltage cap Discharge the anode of the CRT and the chassis in case of electric shock c Weara pair of goggles when handling the CRT to avoid broken pieces damaging your eyes d Do not hold the CRT neck in case of causing damage to the CRT 2 When the power cord needs replacing use the same one as that provided by AKIRA factory 3 Voltage exists between the hot and cold ground when TV is in operation Install a separation transformer during repairing or connecting to a
23. y touching pin 5 of N701 OV NO Check V701 C703 R706 ahd The voltage on pin 9 of N701 The voltage on pin 9 10 1 lof N203 Check VD552 R573 C717 T501 N701 24V YES 9V Hear if there is the voice liking Ka Ka in the loudspeaker via using Signal input way by touching pin 7 of N701 NO Check SP301 SP302 N701 Check R290 N902 N204 Model No 21LAS1Bn Version 1 0 makes life better 18 Only horizontal line in the middle of the screen If vertical deflection circuit does not work this kind of failure will happen In deflection yoke there only has horizontal sweeping the electron beam in the CRT only moves in the horizontal orientation so form this failure While checking horizontal and vertical deflection circuit s failure we have better to use an oscilloscope Please see the diagram on next page Model No 21LAS1Bn Version 2 0 makes life better 19 Abnormal The waveform on the pin 16 of N204 Check C303 R328 N204 Normal 0 The voltage on pin 2 of M402 V 24V Measuring the waveform on pin 1 of M402 Check VD557 R550 V552 N402 N I The deflecti k he CRT Check R328 C446 N402 N204 e deflection yoke on the C Abnormal Abnormal Measuring the waveform on pin 5 of N402 Normal Check N402 Measuring the waveform on the deflection yoke Abnormal Check R442 C413 VD433 X7411 deflection yoke Model No 21LAS1Bn Version 1 0 makes life better 20 d Only vertical line in the middl
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