Changhong rear projection TV CHD4379 after the fire black screen audible fault repair example - android - Phones Developers

DFN1006 TP-RCLAMP3321P ESD Diode Low Capacitance

Maintenance case:
Changhong CHD4379 rear projection, the original fault is the high-voltage line in the middle of the high-voltage package with the fire, quickly shut down, told the user to change the high-voltage package ..., after switching on, hearing the high voltage (and a slight high-voltage discharge sound, in fact, The top of the high-voltage cable of the high-voltage package is perforated at the top of the hat. The filament is also lit. The black screen has a sound. Check the ABL circuit and find that the 10K resistor is broken. Then check and find that the -217V power supply resistor R419 provided for field scanning is open. The VD312 is also worn, and the -414V resistor R414 supplied to the pillow school is also open, and all are replaced. The boot is still black, there is sound, and the characters are normal. Then follow the ABL line to check back, find another board, and then find that the C211 chip capacitor has resistance. After picking up the capacitor with a soldering iron, the boot is normal. Finally, in order to prevent the fire from getting wet in the future, after processing the top with 704 glue, a 20V Zener diode was connected to the ground on the ABL line. The repair is over.