Advertisement
7.8 - HORIZONTAL AND VERTICAL DEFLECTIONS
IC601, T701, T702, Q701 and surrounding components.
Vertical deflection circuit uses a TDA9309 (IC601 - vertical deflection booster) and operates with around 24V
and provides output current to drive the yoke. The input signals are vertical drive A and B from the TV signal
processor (VDRA_pin22 and VDRB_pin21 IC101).
Horizontal deflection circuit uses 15.7KHz signal (HOUT_pin33 IC101) to drive the fly back transformer
(T701) and provides the output current to drive horizontal deflection coil (yoke) and others CTR voltages
(HV, focus, screen and etc.).
The vertical deflection circuit has one protection mode (turn-off the power supply if a fault situation is
detected) and the horizontal deflection circuit has two protection modes:
-turn-off the power supply if a HV over voltage is detected (X-ray protection);
-turn-off the power supply if a horizontal drive transistor (Q701) overstress is detected.
33
Advertisement
