BenQ Q7C3 Service Manual page 46

Q7C3 LCD Monitor Service Guide
Circuit Operation Theory
3.3 Oscillator Circuit
Royer circuit uses the characteristic of transformer saturation to oscillate. When the DC power inject,
Q759 or Q760 will turns on, and the current Ic increases. After a period, the transistor will leave the
saturation status and Vce increase. The result causes the voltage of primary coil get lower. Finally the
transistor turn off, and another transistor turn on. These statuses are repeated and the pin7 and pin8 of T751
will get a Sin Wave to turn on CCFL.
12