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Product
Circuit Diagram
Circuit Description
Change Bulletin
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Problem Solving Guide
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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
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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. (Scop)
Q802,IC801,IC802,R806,R817, D801,D802,D803,D804,D807, D812,D823,Q810,TR802,F801, R813,R814,Q805,Q806,Q807, Q809
IC502,IC501,IC701,Q605,IC401, IC100,Q603,TR601,D603,D609, IC901,R605
D609,IC901,IC401,IC701,IC502, IC501,Q601,D608,D701,C903, C708,Q701,Q426,D603,PL402 Kablosu
C611 C611,TR602,Q809
R611,PL602 Kablosu
IC501,L501,IC502,Q702,R547, D506,D507,Q702 IC701,IC401,IC901,IC502,
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working. 14 Vertical is folded 15 There is not station (PLL Tuner) 16 There is not station (VST Tuner)
Vertical drive signal must to be (1Vpp scop) 1-Pin 6 of IC701: +45V
R702, R703,D606 IC701,R704,IC502,C632,C702,
17 Led is on, but some late 18 Led is off 19 Led is blink
R704,D605 1-Pin 4 of Tuner: SCL 4.5Vpp (Scop) 2-Pin 5 IC502,TU201,IC501,IC401, of Tuner: SDA 4.5Vpp (Scop) 3-Pin 9 of Tuner : +20V DC 4-Pin 7 of Tuner : +5V DC D604,Q407 5-Pin 1 of Tuner : +2V DC (aproix.) 1-Pin 3 of Tuner: +5V DC (UHF) 2-Pin 4 of IC502,TU201,IC501,IC401,D604, Tuner: +5V DC (VHF3) 3-Pin 5 of Tuner: +5V DC (VHF1) 4-Pin 6 of Tuner: +5V DC 5-Pin 1 Q502,Q510,Q508,Q501,Q407 of Tuner: +2V DC (aproix.) 6-Pin 2 of Tuner: From 0' to 33V DC variable Q810 Q810,Q512,IC801 IC501,Q810,CRT,D605,IC801, IC401,IC901,D811,D812,Q605, IC100,Q805,Q806,Q807 MD501,IC100,IC501,IC502
20 Remote control is not controlling to TV. 21 Vertical lines 1-CRT aqua cable maybe snap. are broking in the picture
1-There may be a short-cut or overcurrent situation on one of the supplying voltages. E.g: +5V, +8V etc. 1-Pin 15 of IC501 : +5VDC 2-Pin 2 of MD501 : +5VDC 3-Pin 3 of MD501 : IR signal level must be 5Vpp.
D420,Q810,D402,D601,IC401, C618, AQUA CABLE,C604,R717,C435,C436 IC401,IC502 IC401,X401,IC502
22 Coloured snowy 23 There is no
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colour in the picture 24 High voltage spark 25 No OSD
CRT,TR602
1-Pin 45 of IC501 : Sandcastel input signal IC501,IC502,IC401,R486,Q420, level must be 4Vpp (Scop) 2-Pin 38 and 39 of R554,R488,L501,C511,C512 IC501: 4.5Vpp osc. signal (Scop) 3-Pin 26 of IC401 : Fast-Blank signal level must be +4Vpp when OSD is activated.(Scop) 26 Faults of OSD D506,IC501,D507,D508,IC401, IC502 27 Light is little R615,D608,D701,IC901 28 Light is much D408,IC401,IC502 29 East-West D612,L604,R629,Q603,IC401, geometry D611,R606,C626 adjustment is fault 30 Sync. is 1-IC401 pin 13: Video signal input pals must IC502,Q407 sliding. be1.3Vpp. 31 Folding from C611 left and right sides 32 No picture in IC050 PIP 33 No screen 1-Screen cable may be defected. IC901,D609,C903,TR802 adjustment 34 Spot in the Q601,C902,IC901 middle of the screen 35 Blue opicture C415 in Secam
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36 Raster is O.K (picture is milky)
1-IC401 pin 13: Video signal input 1.3Vpp.
IC401,IC701
Hazirlayan: Ercan ÖZ
Last Updated on 11.02.1999 By VESTEL
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10.09.2002