BenQ Q7T3-FP737S Service Manual page 27

Q7T3-FP737S Dual function LCD Monitor Service Guide
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.
Circuit Operation Theory
Confidential
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