BenQ Q7T4-FP71G, Service Manual

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Q7T4-FP71G LCD Monitor Service Guide
Circuit Operation Theory
5
Confidential
#3 Switching element and Isolation power transformer
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
#4 Rectifier and filter
D701 and C703 are to produce DC output. L701 is used to suppress high Frequency switching spikes.
(See Fig.5)
Fig. 5