BenQ Q7C3 Service Manual page 45

Q7C3 LCD Monitor Service Guide
Circuit Operation Theory
3.2 PWM Control circuit
TL1451 is a dual PWM controller.C765 and R765 decide the working frequency.BLT_ADJ signal is
from control board, control pulse width then decide how much energy delivery to CCFL also decide
CCFL brightness. Q741 and Q742 be the buffer to rise the drive capability and the totem poles circuit
can improve a capable of driving for Q743.C770 decide the striking time delay.
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