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| اعلانات |
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| اعلانات اضافية ( قم بتسجيل الدخول لاخفائها ) | |
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التعديل الأخير تم بواسطة : omar hkim بتاريخ 15-12-2011 الساعة 04:25 AM |
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56 57 58 جهد الفيديو الخارج من اللاين في حدود 160 فولت تغدية الابروم 3.3 فولت بعد كتم الجهاز هل يومض ليد الواجهة وما عدد الومضات اسي الفرتكال يشتغل بالجهدين -*13 و +13 فولت تخرج من اللاين يمكنك الاستعانة بعدد الومضات للكشف عن العطل Via this procedure, you can make the contents of the error buffer visible via the front LED. This is especially useful when there is no picture. When the SDM is entered, the LED will blink the contents of the error-buffer. Error-codes  10 are shown as follows:– a long blink of 750 ms (which is an indication of the decimal digit), – a pause of 1.5 s, – n short blinks (n = 1 - 9), – when all the error-codes are displayed, the sequence finishes with a LED blink of 3 s, – the sequence starts again. Example of error buffer: 12 9 6 0 0 After entering SDM: – 1 long blink of 750 ms followed by a pause of 1.5 s, – 2 short blinks followed by a pause of 3 s, – 9 short blinks followed by a pause of 3 s, – 6 short blinks followed by a pause of 3 s, – 1 long blink of 3 s to finish the sequence, – the sequence starts again. ======================== عوامل الحماية Protections If a fault situation is detected an error code will be generated and if necessary, the set will be put in the protection mode. Blinking of the red LED at a frequency of 3 Hz indicates the protection mode. In some error cases, the microprocessor does not put the set in the protection mode. The error codes of the error buffer can be read via the service menu (SAM), the blinking LED procedure or via ComPair. The DST diagnose functionality will force the set into the Service-standby, which is similar to the usual standby mode, however the microprocessor has to remain in normal operation completely. To get a quick diagnosis the chassis has three service modes implemented: • The Customer Service Mode (CSM). • The Service Default Mode (SDM). Start-up of the set in a predefined way. • The Service Alignment Mode (SAM). Adjustment of the set via a menu and with the help of test patterns. See for a detailed description Chapter 9 paragraphs Deflection and Power Supply. ====================== الاعطال Repair Tips Below some failure symptoms are given, followed by a repair tip. • Set is dead and makes hiccuping sound ‘MainSupply’ is available. Hiccuping stops when de-soldering L5561, meaning that problem is in the ‘MainSupply’ line. No output voltages at LOT, no horizontal deflection. Reason: line transistor TS7460 is defective. • Set is dead, and makes no sound Check power supply IC7520. Result: voltage at pins 1, 3, 4, 5 and 6 are about 180 V and pin 8 is 0 V. The reason why the voltage on these pins is so high is because the output driver (pin 6) has an open load. That is why MOSFET TS7521 is not able to switch. Reason: feedback resistor 3523 is defective. Caution: be careful measuring on the gate of TS7521; circuitry is very high ohmic and can easily be damaged! (first connect measuring equipment to ground, then to the gate). • Set is in hiccup mode and shuts down after 8 s. Blinking LED (set in SDM mode) indicates error 5. As it is unlikely that μP ‘POR’ and ‘+8V protection’ happen at the same time, measure the ‘+8V’. If this voltage is missing, check transistor TS7480. • Set is non-stop in hiccup mode Set is in over current mode; check the secondary sensing (opto coupler 7515) and the ‘MainSupply’ voltage. Signal ‘Stdby_con’ must be logic low under normal operation conditions and goes to high (3.3 V) under standby and fault conditions. • Set turns on, but without picture and sound The screen shows snow, but OSD and other menus are okay. Blinking LED procedure indicates error 11, so problem is expected in the tuner (pos. 1000). Check presence of supply voltages. As ‘Vlotaux+5V’ at pin 5 and 7 are okay, ‘VT_supply’ at pin 9 is missing. Conclusion: resistor 3460 is defective. • Set turns on, but with a half screen at the bottom. Sound is okay Blinking LED (set in SDM mode) indicates error 3. Check ‘Vlotaux+13V’ and ‘+50V’. If they are okay, problem is expected in the vertical amplifier IC7471. Measure with a scope the waveform on pin 17 of the UOC. Measure also at pin 1 of IC7471. If here the signal is missing, a defective resistor R3244 causes the problem. |
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اخي العزيز / عمر
بالاضافة الى ما تفضلوا بذكره اساتذنا الكرام...بدوري انصحك اولا و قبل اي اجراء اخر بضبط جهد السكرين VG2 و السبب انه على حسب بعض المعلومات فان هذا الشاسيه يعمل حماية للVG2 و تكون قيمة هذا الجهد بين 135 و 145 فولط :  و دائما على حسب هذه المعلومة فيكون محور مفتاح السكرين في اتجاه الساعة ال11 :  اما اذا اردت ان تعرف ان كان الجهاز عامل حماية فقم بقياس الجهد على الطرف 34 لمتكاملة العمليات : * في الحالة العادية للتشغيل = 2.1 فولط * في حالة الحماية = 8 فولط. اخيرا...لقد نسيت بان اضع لك المخطط...هههههههههه...تفضل من هنا : http://www.sendspace.com/file/vobd47 |
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السلام عليكم اخي العزيز ياسين كيف الحال اتمنى ان تكون في تمام صحة والعافية ارجو منك طلب بسيط بعدما كنت اقوم بقياسات خروج فولتيات وقعة في مشكلة وقع لي تماس واصبح مخرج فولت عوض 95v اصبحا في تزايد 120v تم تنزل الى 115v وكدالك عوض خروج 12v اصبح 4v تم يصعد الى 8v يعني غير تابتين قمت بتغيير مكتف داخل البور 16v33uf ومراقبة كل القطع بعد شوبر كلها جيدة ماعدا وجدة مقاومة منفصلة سعتها 68 اوم وغيرتها ارجو توضيح سبب في المشكل 
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