Explation For Micom Circuit; Explanation For Pwb Circuit; Power Circuit - LG SxS Service Manual

EXPLATION FOR MICOM CIRCUIT

1. Explanation for PWB circuit

1-1. Power circuit

Power circuit consists of SMPS (SWITCHING MODE POWER SUPPLY) power. The SMPS consist of the rectifying part
(BD1, CE1) converting AC voltage to DC voltage, the switching part (IC2) switching the converted DC voltage, transformer
transferring energy of the primary side of the switching terminal to the secondary side and the feedback part (IC3, IC4)
transferring it to the primary side.
Caution : Since high voltage (DC310V) is maintained at the power terminal, please take a measure after more than 3
minutes have passed after removing power cords in the abnormal operation of a circuit.
Voltage of every part is as follows:
Part VA1
Voltage 230 Vac
<GW-B/C227: 88-LED>
<GW-B/C227: Bar-LED>
CE1 CE2
inspection Vdc 13~16 Vdc
- 26 -
CE3 CE4
12 Vdc 15.5 Vdc
CE5
5 Vdc