Explanation For Micom Circuit; Explanation For Pwb Circuit - LG LRSC26960TT Service Manual

EXPLANATION FOR MICOM CIRCUIT

1. Explanation for PWB circuit

1-1. Power circuit
The power circuit consists of a Noise filter (SUB PWB) which plays the role of noise rejection and an SMPS (Switching
Mode Power Supply) power. The SMPS consists 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 secondary side and a feedback part (IC3, IC4) transferring it to the primary side Linear Compressor driver SMPS
consist of two (+,-) output power source.
Caution: The linear compressor drive circuit (IC201) and the general circuit (IC1) have separated supplies and grounds.
Therefore, when checking voltages be sure to use the correct ground when checking each circuit.
Voltage of every part is as follows:
Part CM3
Voltage 120 Vac
Caution: High voltage (160 VDC) is maintained at the power terminal. Wait at least 3 minutes after removing power cords,
for capacitors to discharge, before taking measurements.
CE1 CE203
160 Vdc 12.5 Vdc
- 21 -
CE204 CE3
-12.5 Vdc 15.5 Vdc
CE4
12 Vdc