LG GN-B492Y*C, Service Manual

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7-2 PCB FUNCTION
7-2-1 POWER CIRCUIT
The power circuit consists of the noise attenuation part and the SMPS (Switch Mode Power Supply) part. The SMPS
consists of the rectifier (D1,D2,D3,D4 & CE1) to convert AC voltage to DC voltage, switching part (IC2) to switch the
converted DC voltage, transformer to transmit energy of the first side of the switching end to the second side, the secondary
power to supply power to MICOM and IC, and the feedback part (IC3) to feedback the secondary voltage to the first side of
the transformer in order to maintain the secondary voltage constant.
Caution: High voltage (DC 310V) is maintained in this circuit. Wait at least 3 minutes after unplugging to allow the
current to dissipate. There is a danger of electric shock.
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