Switching Element And Isolation Power Transformer - BenQ Q7T4-FP71G Service Manual

Q7T4-FP71G LCD Monitor Service Guide

#3 Switching element and Isolation power transformer

#4 Rectifier and filter
D701 and C703 are to produce DC output. L701 is used to suppress high Frequency switching spikes.
(See Fig.5)
When the Q601 turns on, energy is stored in the transformer.
During Q601 turn-off period, the stored energy is delivered to the
secondary of transformer. R607, C607 and D601 is a snubber circuit.
R615 is current sense resistor to control output power. (See Fig.4)
Fig. 4
Confidential
Circuit Operation Theory
Fig. 5
5