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File name AK19 Problem solving guide.pdf

ARIZALAR1 Seite 1 von 5 Product Circuit Diagram Circuit Description Change Bulletin Hardware & Software Opt. Service Manual Problem Solving Guide Exploded Views PROBLEM SOLVING GUIDE OF THE 11AK19 MAINBOARD : From the "Problem Solving Guide" menu you select a chassis and see the "Problem Solving Guide" page designed for that chassis. In these pages, you can see some well-known and mostly faced problems and some hints to detect the source of the problem. If the conditions in the "Descriptions" parts are the situations that you face up with, then beside that description , you can see the "Defected components" to be replaced for solving the problem. NR PROBLEM 1 No sound (mono) DESCRIPTIONS 1-Speakers 2-IC100 pin 5: -12.5VDC 3-IC100 pin 7: +12.5VDC 4-IC100 pin 2: +12.5VDC 5IC100 pin 9: Sound signal (Scop) 6-IC401 pin 15: Sound signal (Scop) 7-IC401 pin 55:Sound signal (Scop) 1-Speakers 2-IC100 pin 5: -12.5VDC 3-IC100 pin 7: +12.5VDC 4-IC100 pin 2: +12.5VDC 5IC100 pin 9: Sound signal (Scop) 6-IC100 pin 1:Sound signal (Scop) 7-PL404 pin 4: Sound signal (Scop) 8-PL404 pin 5: Sound signal (Scop) 1-IC501 pin 9 :0V 2-IC501 pin 18 :5V 3-IC401 pin 2: Sound signal (Scop) 4-IC402 pin 8: Sound signal (Scop) DEFECTED COMPONENTS Speakers,IC100,IC502,IC401, Q402 2 No sound (stereo) Speakers,Sound Board,IC100,IC502 3 No sound (Secam L mono) 4 No sound in the Nicam mode 5 Sound level is 1-IC401 pin 55: 3V DC 2-500mVpp audio low (mono) (Scop) 3-100mVpp RF signal (Scop) IC402 IC502 Q401,IC100 https://www.vestelservice.com/service/problem19.asp 10.09.2002 ARIZALAR1 Seite 2 von 5 6 Not working (Supply is defective) 7 Not working (Supply is working) 8 There is not Light (when the increase the screen voltage, to be seen flyback lines.) 9 Picture is wide 1-Cathode of D816 : 115VDC (For 110° models:150VDC) 10 Picture is 1-The voltage on the cathode of D816 must narrow be 115VDC for 90 degree models (It should be 150VDC for110 deg. Models) 11 There is not 1-The voltage between the pins F1 and F2 of light (Flaman tube socket must be 6.3V RMS or 20Vpp is not working) (Scop) 12 Faults of 1-Pin 30 of IC501 : Video signal level must be teletext part. 1.2 Vpp (Scop) 13 Vertical is not 1-Pin 3 of IC701: +15V 2-Pin 1 of IC701: 1-An isolation transformer should be used while measuring the voltages on nthe primary side. 2-Driving signal must be exist on the gate of Q802 (Scop). 3-There should be +12V DC supply voltage on the pin 1 of IC802. 4Are all of the secodary voltages O.K? 5-Pin 41 of IC501 must be +5V in normal working mode and it must be 0V in ST-BY. 1-Disconnnect the pins 4 and 5 of IC502. If TV works, replace IC502 with the new and the right prorammmed one) 2-Horizontal drive signal should included on the 40 of IC401 (Scop) 3-IC401 pin 40:1.1V (on mode) 4IC401 pin 40:+8V (st-by) 5-D602 : 1V 6D607 : 12.5V 1-Pin 22 of IC401: The vertical pulse amplitude level must be 5Vpp (50Hz) (Scop) 2-Pin 18 of IC401: The black current signal level must be 7 Vpp.

File name AK19_Circuit Description.pdf

PTC DEGAUSS COIL D 811 IC 804 S + 5V D 801,802,803,804 + 12V 220V/AC IC 805 + 8V + 14V D 806 D 812 D 813 IC 807 + 5V D 814 + 300V R 806 START UP D 815 - 14V IC 802 9 10 11 12 13 14 15 16 8 7 6 5 4 3 2 1 PROTECTION SENSE + 14V Q 802 D 816 + 115 / 150V OPTOCOPPLER Q 810 IC 801 REG-SENSE R 819 I-SENS Q809 Q 807 STAND-BY = LOW ON = HIGH STAND-BY = HIGH ON = LOW D 819 S C H A L T N E T Z T E L E N S C H A L T E N D E S G E R A E T E S W E N N D A S F S G M T D E M N E T Z S C H A L T E R E N G E S C H A L T E T W R D B E K O M M T D A S IC 8 0 2 Ь B E R D E M W D E R S T A N D R 8 0 6 A N P IN 1 E I N " S T A R T -I M P U L S " .D A S I C 8 0 2 E R Z E U G T N U N A M P N 3 D A S A N S T E U E R S G N A L F Ь R D E N T H Y R S T O R .D I E V ERSO RG U N G SSPAN N U N G DES T H Y R IS T O R S ERZEUGEN D E G L E IC H R IC H T E R D IO D E N D 8 0 1 ,D 8 0 2 ,D 8 0 3 U N D D 8 0 4 .D I E S E G E L A N G T Ь B E R D I E W I C K L U N G D E S S M P S -T R A F O S A N DEN G A IN DES T H Y R IS T O R S .S O B A L D D A S I C 8 0 2 D A S A N S T E U E R S IG N A L L E F E R T ,B E G I N N T D E R T H Y R I S T O R Z U A R B E IT E N U N D A M S M P S T R A F O S I N D N U N A L L E S E K U N D A E R S P A N N U N G E N V O R H A N D E N .D IE S P A N N U N G S V E R S O R G U N G D E S I C 8 0 2 E R F O L G T N U N Ь B E R D E D O D E D 8 0 5 . S T A N D -B Y Z U S T A N D W ENN AM CONTROLLER IC 501 D IE V ERSO RG U N G SSPAN N U N G S +5V A N L IE G T ,B E F I N D E T S IC H D IE S E R Z U N A E C H S T I N S T A N D -B Y Z U S T A N D .I N D IE S E M F A L L W R D D E R T R A N S I S T O R Q 8 0 7 L E I T E N D ,D IE Z E N E R D I O D E D 8 1 9 L E G T A N M A S S E ,A M I C 8 0 2 P I N 1 5 L IE G T E I N E G L E I C H S P A N N U N G V O N C A .1 0 V A N .D A S N E T Z T E I L A R B E I T E T N U N I M B U R S T M O D E S O D A S A L L E S E K U N D A E R S P A N N U N G E N A U F C A .1 0 % I H R E S N O R M A L W E R T E S F A L L E N .IM S T A N D -B Y Z U S T A N D IS T D E R T H Y R IS T O R Q 8 1 0 L E IT E N D , D A S S T A B I IC 8 0 4 B E K O M M T S E IN E G L E IC H S P A N N U N G V O N D E R B + W IC K L U N G U N D S O M IT W IR D G E W A E H R L E IS T E T D A S IM S T A N D -B Y Z U S T A N D D IE S + 5 V S P A N N U N G E R H A L T E N B L E IB T . REGELUNG D I E N E T Z T E I L R E G E L U N G E R F O L G T D U R C H D E N A U S T L 4 3 1 ,I C 8 0 1 U N D I C 8 0 2 G E B I L D E T E N S C H A L T K R E IS . I C 8 0 1 I S T E I N O P T O C O P P L E R ,D U R C H D E N D IE G L E I C H S P A N N U N G D E S I C 8 0 2 P I N 1 5 B E S T M M T W I R D .M I T D E M W E R T D I E S E R G L E I C H S P A N N U N G W IR D D A S N E T Z T E I L G E R E G E L T .D I E L E IT F A H I G K E I T D E S O P T O C O P P L E R S I C 8 0 1 W I R D D U R C H D I E R E G E L B A R E Z E N E R D I O D E T L 4 3 1 G E S T E U E R T .D IE R E G E L B A R E Z E N E R D I O D E T L 4 3 1 B E K O M M T D A S A N S T E U E R S IG N A L D IR