Repairing Xoceco TZ2939.
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Symptom: The normal display of the image is normal with the sound. In less than a minute, the speaker makes a squeaking sound and then stops.
Disassemble inspection, The high voltage package has been dismantled, the field block has been dismantled, and the super chip soldering is only so ugly. AFC has a resistance burnt and has been directly shorted by the used wires.
Overhaul: Banana water cleaning circuit board, B+130V is normal, other power supplies are basically normal, and the analysis may be caused by abnormal work. Replace the field 50V/100UF bootstrap boost capacitor (depending on pregnancy), repair the welding field block, restore the AFC resistance (10K--R457) test machine is normal, unfortunately the normal less than 10 minutes failure again! Shut down and then turn on the test machine to monitor the B+ voltage until the fault occurs. Repeatedly switch the test machine--observing the image change, the amplitude of the image field changes when the speaker makes a strange call, the monitoring field is positive, the negative power supply has been normal, and the LA78041 generation is used. For the original 8177A test machine, the sound of the waves is still the same, and then repair the super chip test machine. After more than 30 minutes, it is still normal, and my heart is secretly self-satisfied. But I still don't dare to deliver the user! Continue to test the machine without paying attention to how long the time has passed. NND is down again! I don't dare to neglect. Disconnecting the sound supply test machine is still faulty, monitoring the super chip power supply 3.3V, 5V, 3.3V unchanged, 5V voltage slowly drops to 4V after the test machine for a period of time, the fault occurs. The power supply is controlled by V502. When the fault occurs, the C pole input voltage does not change, and the B pole voltage does not change. It is decided to replace the C2383 transistor with C2482 and C2068, and the E voltage is 4.2V. Then use the original C2383 to boot, it is not long, can not find the same model of the C2383 test machine, the test machine yesterday afternoon normal, this morning test machine, has been normal. I feel very confused! Can you help me analyze what is special about this C2383?