akira 21LAS1, Service Manual

Page 1: ...C C Co o ol l lo o ou u ur r r T T TV V V S S Se e er r rv v vi i ic c ce e e M M Ma a an n nu u ua a al l l ...

Page 2: ...2 Model No 21LAS1Bn Version 2 0 M M Mo o od d de e el l l G G Gr r ro o ou u up p p 2 2 21 1 1L L LA A AS S S1 1 1 CHASSIS 8821 MODEL 21LAS1 BN ...

Page 3: ...NERAL DESCRIPTION 4 CONNECTOR VIEW 5 SAFETY INSTRUCTIONS 5 CIRCUIT ADJUSTMENTS 6 FAULT FINDING TREES DIAGRAMS AND OVERVIEWS 12 VARIOUS PARAMETERS OF INTEGRATED CIRCUIT 25 THE BUS DATA FOR TMPA8803 25 ELECTRICAL PARTS LIST 28 CIRCUIT DIAGRAM 37 ...

Page 4: ...h fewer external components which provide much convenience for manufacturing and technical service Figure 1 shows the block diagram of AKTP01 A14T02 Table 1 provides A14T02 mainly ICs and functions Figure 2 shows the whole set power supply system for AKTP01 A14T02 Figure 3 shows the system control circuit of AKTP01 A14T02 Table 1 A14T02 mainly ICs and functions Position Type Function Description N...

Page 5: ...00 V103 V102 IF PRE AMP V101 SAWF Z101 POWER SUPPLY CIRCUIT V512Е V513Е V511Е T501Е VD515 Resistance disturbance C501Е L502 AC150 260V 50 60Hz Bridge rectification VD503 VD506 Filter C507 VIDEO AMPLIFIER V601 V611 V621 FIELD OUTPUT POWER AMP N402 LA78040 HORIZONTAL DRIVE V444 T401 HORIZONTAL OUTPUT V411 FBT T402 BSC23 MEMORY N901 ST24C16 KEY BOARD REMOTE RECEIVER A901 114V HF TUNER A101 146V 24V 1...

Page 6: ...high voltage cap Discharge the anode of the CRT and the chassis in case of electric shock c Wear a 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 opera...

Page 7: ...fter 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 chass...

Page 8: ...it Work 13 13 Ѱ1V Audio Power Out 19 19 Ѱ1V 3 TV 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 AV in output inspection Item AKTP01 02 chassis Measuring Equipment SG w...

Page 9: ...cope Load a 10K resistor to AUDIO output terminal 0 7Vp p audio output signal that is from TV should be observed on the oscilloscope Focus adjustment Item AKTP01 02 chassis Measuring Equipment SG 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 th...

Page 10: ...or B key respectively to adjust the white balance of low light until the white balance of high and low light is good RF AGC adjustment Item AKTP01 02 chassis Measuring Equipment SG and digital multi meter No 5 service remote controller Preparation before Adj 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 6...

Page 11: ...tem press or 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 Equipment SG User remote controller and No Preparation Before Adj The set is turned on Inspection procedure 1 ...

Page 12: ...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 ...

Page 13: ...7 V572 V511 Check VD556 C561 Recover R449 unplug XZ411 for a While then test the voltage of C561 Check V411 T402 T401 Deflection coil Check L414 VD403 C411 Deflection coil Voltage of C507 Check if V501 collect emitter Was broken down Check the voltage of V501 collector Check T501 Test voltage of V501 base Check T501 VD517 C515 C517 V411 VD552 VD555 C415 C418 T402 C412 Check if it get right When cu...

Page 14: ...l 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...

Page 15: ...in 25 9 36 44 of N204 Check N902 L302 N204 Check N902 N204 L901 C914 R327 C307 L201 C209 C230 L230 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 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 Observe if snow noise wave disturbance...

Page 16: ...l 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 ...

Page 17: ...4 Check R202 C202 N204 Check R290 N902 N204 The voltage on pin 9 10 11of N203 Check 9V power supply Hear if there is the voice liking Ka Ka in the loudspeaker via using Signal input way by touching pin 7 of N701 Check VD552 R573 C717 T501 N701 The voltage on pin 16 of N203 Hear if there is the voice liking Ka Ka in the loudspeaker via using Signal input way by touching pin 12 of N203 Check C292 R2...

Page 18: ... 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 ...

Page 19: ... Measuring the waveform on the deflection yoke Check C303 R328 N204 The voltage on pin 2 of N402 Check VD557 R550 V552 N402 Check N402 Measuring the waveform on pin 1 of N402 Check R328 C446 N402 N204 Measuring the waveform on pin 5 of N402 Check R442 C413 VD433 XZ411 deflection yoke Abnormal The deflection yoke on the CRT ...

Page 20: ... holds two conditions as follow 1 The power supply In general it is 5V 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...

Page 21: ...204 with an oscilloscope Check the voltage on the positive pole of C927 NO YES 4 98V 4 98V Check alternant voltage on secondary coil of T501 Check Z901 N204 Check R574 VD922 Check the voltage on the pin 5 of N204 Check T501 VD553 R558 Check N204 Check the voltage on the emitter of V902 Check the voltage on the positive pole of VD902 Check VD902 R947 Check R946 R945 V902 Check R941 ...

Page 22: ...ocated 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 YES NO Check FBT T402 No OSD Check the wave on the pin 4 of FBT Check C452 R462 VD436 R321 N204 ...

Page 23: ...5 TV DVcc Vcc terminal for Digital block 26 V1 in In Input terminal for Video signal 27 ABCL In Input terminal for ABL ACL control 28 AU out Out Output terminal for Audio signal 29 IF Vcc 9V Vcc for terminal for IF Circuit 30 TV out Out Output terminal for detected PIF signal 31 SIF out Out Output terminal for detected SIF signal 32 Ext AU in In Input terminal for External Audio signal 33 H correc...

Page 24: ...n 5V power supply 56 VIDEO1 2 Out Video 1 or 2 selection control 57 SDA1 I O IIC BUS SDA1 58 SCL1 I O IIC BUS SCL1 59 System Out System 60 VT Out VT output 61 MUTE Out Mute Output 62 H SYNC In Horizontal sync signal input 63 REMOTE In Remote controller signal input 64 POWER I O Power control Check On Hi Z input Off L output B Pin functions of N701 LA4266 67 Pin Symbol I O Function 1 NC 2 NC 3 Filt...

Page 25: ...min difference 28 22 ST3 Sub sharp center 3 58NTSC TV 20 23 SV3 Sub sharp center 3 58NTSC AV 20 24 ST4 Sub sharp center OTHER TV 20 25 SV4 Sub sharp center OTHER AV 20 26 SVD DVD sharp center 26 27 ASSH Factory Data 07 28 SHPX Sub sharpness max difference 38 29 SHPN Sub sharpness min difference 15 30 TXCX Text RGB contrast max 1F 31 RGCN Text RGB contrast min 1F 32 ABL ABL Data 37 33 DCBS A part o...

Page 26: ...LAGS 04 63 REFP REF Pulse Position 00 64 RSNS R SENS 00 65 GSNS G SENS 00 66 BSNS B SENS 00 67 MOD Factory Data 30 68 STBY VCD IF STANDBY 00 69 SVM SVM 00 70 VBLK V BLK Start Stop 00 71 VCEN Factory Data 27 72 HSIZ Factory Data 20 73 PRBR Factory Data 20 74 TRUM Factory Data 10 75 ECCT Factory Data 10 76 ECCB Factory Data 10 77 EHT Factory Data 24 78 UCOM Miciom Control 00 79 PYNX Factory Data 2E ...

Page 27: ...tion Type Data 94 CUR STEP Factory Data 02 95 AUSTP When Mute off Vol ATT up step number 04 96 MODE0 Factory Data 9D 97 MODE1 Factory Data 03 98 OSDF OSD width 53 99 OSD OSD position 10 100 OPT Factory Data E7 NOTE The data provided in the form provides to consult only ...

Page 28: ... R206 D10B101J T Carbon resistor RT13 1 6W 100ȍ 5 R207 D10B101J T Carbon resistor RT13 1 6W 100ȍ 5 R208 D10B101J T Carbon resistor RT13 1 6W 100ȍ 5 R210 D10B101J T Carbon resistor RT13 1 6W 100ȍ 5 R217 D10B101J T Carbon resistor RT13 1 6W 100ȍ 5 R218 D10B101J T Carbon resistor RT13 1 6W 100ȍ 5 R219 D10B101J T Carbon resistor RT13 1 6W 100ȍ 5 R220 D10B101J T Carbon resistor RT13 1 6W 100ȍ 5 R231 D1...

Page 29: ...on resistor RT13 1 6W 1Kȍ 5 R603 D10B102J T Carbon resistor RT13 1 6W 1Kȍ 5 R613 D10B102J T Carbon resistor RT13 1 6W 1Kȍ 5 R623 D10B102J T Carbon resistor RT13 1 6W 1Kȍ 5 R902 D10B102J T Carbon resistor RT13 1 6W 1Kȍ 5 R904 D10B102J T Carbon resistor RT13 1 6W 1Kȍ 5 R925 D10B102J T Carbon resistor RT13 1 6W 1Kȍ 5 R115 D10B152J T Carbon resistor RT13 1 6W 1 5Kȍ 5 R480 D10B152J T Carbon resistor RT...

Page 30: ...1 6W 12Kȍ 5 R1003 D10B123J T Carbon resistor RT13 1 6W 12Kȍ 5 R213 D10B153J T Carbon resistor RT13 1 6W 15Kȍ 5 R216 D10B153J T Carbon resistor RT13 1 6W 15Kȍ 5 R293 D10B153J T Carbon resistor RT13 1 6W 15Kȍ 5 R328 D10B153J T Carbon resistor RT13 1 6W 15Kȍ 5 R447 D10B153J T Carbon resistor RT13 1 6W 15Kȍ 5 R607 D10B153J T Carbon resistor RT13 1 6W 15Kȍ 5 R7007 D10B153J T Carbon resistor RT13 1 6W 1...

Page 31: ...istor RT15 1 2W 6 8Kȍ 5 R552 D10D473J T Carbon resistor RT15 1 2W 47Kȍ 5 R520 D10D104J T Carbon resistor RT15 1 2W 100Kȍ 5 R521 D10D104J T Carbon resistor RT15 1 2W 100Kȍ 5 R561 D10D224J T Carbon resistor RT15 1 2W 220Kȍ 5 R413 S10E472J S A Metal oxide resistor RY16 RY21 1W 4 7Kȍ 5 R600 S10F1R0J C Metal oxide resistor RY17 RY21 2W 2 2ȍ 5 R564 S10E471J C Metal oxide resistor RY16 RY21 1W 470ȍ 5 R60...

Page 32: ...F103Z T Ceramic capacitor CT1 08A 2F4 50 63V 0 01uF Z C233 C2FF103Z T Ceramic capacitor CT1 08A 2F4 50 63V 0 01uF Z C304 C2FF103Z T Ceramic capacitor CT1 08A 2F4 50 63V 0 01uF Z C309 C2FF103Z T Ceramic capacitor CT1 08A 2F4 50 63V 0 01uF Z C310 C2FF103Z T Ceramic capacitor CT1 08A 2F4 50 63V 0 01uF Z C574 C2FF103Z T Ceramic capacitor CT1 08A 2F4 50 63V 0 01uF Z C604 C2FF103Z T Ceramic capacitor CT...

Page 33: ...01M T Electrolytic Capacitor CD110 16V 100uF M C704 E20C101M T Electrolytic Capacitor CD110 16V 100uF M C927 E20C101M T Electrolytic Capacitor CD110 16V 100uF M C928 E20C101M T Electrolytic Capacitor CD110 16V 100uF M C209 E20C471M T Electrolytic Capacitor CD110 16V 470uF M C222 E20C471M T Electrolytic Capacitor CD110 16V 470uF M C311 E20C471M T Electrolytic Capacitor CD110 16V 470uF M C571 E20C47...

Page 34: ...0V 63V 3900PF K C305 F20F822J T Mylar capacitor CL11 50V 63V 8200PF K C515 F22F123J T Mylar capacitor CL21X 50V 63V 0 012uF K C517 F20F223K T Mylar capacitor CL11 50V 63V 0 022uF K C514 F20F393K T Mylar capacitor CL11 50V 63V 0 039uF K C447 F20F563K T Mylar capacitor CL11 50V 63V 0 056uF K C460 F20F104K T Mylar capacitor CL11 50V 63V 0 1uF K C461 F20F104K T Mylar capacitor CL11 50V 63V 0 1uF K C70...

Page 35: ...e TVR4N TRM11C VD556 DR0017XX Diode RGP10J VD554 DR0018XX Diode RGP10D VD555 DR0031XX T Diode TJ1010 VD551 DZ0001XX T Diode RD6 2EB3 HZ7A1 VD922 DZ0002XX T Diode RD5 1EB2 HZ5C1 VD501 DZ0006XX T Diode RD3 6L HZ4A2 VD902 DZ0006XX T Diode RD3 6L HZ4A2 VD921 DZ0015XX T Diode RD5 6EB2 HZ6B1 VD216 DZ0011XX T Diode RD9 1EB2 HZ9B2 VD217 DZ0011XX T Diode RD9 1EB2 HZ9B2 VD703 DZ0011XX T Diode RD9 1EB2 HZ9B2...

Page 36: ... RXC945XX T Audion 2SC945 2SC1815 2SC536E V571 RXC945XX T Audion 2SC945 2SC1815 2SC536E V572 RXC945XX T Audion 2SC945 2SC1815 2SC536E V701 RXC945XX T Audion 2SC945 2SC1815 2SC536E V901 RXC945XX T Audion 2SC945 2SC1815 2SC536E V411 RXD2499X Audion 2SD2499 2SD1651 V905 RXD400XX T Audion 2SD400D Z304 FC0007XX Ceramic trap filter XT6 0M Z302 FC0008XX Ceramic trap filter XT5 5M Z101 SAWF 1339 38 9M F50...

Page 37: ...37 Model No 21LAS1Bn Version 2 0 CIRCUIT DIAGRAM ...