Samsung DV316LGW/XAA Service Manual page 73

▶ Function
Generates a required DC power of 12V or 5V in case of supplied or disconnected
AC power.
▶ Description
- When AC 220V is applied to CN3, D17 D20 transforms it to DC 300V.
- DC 300V is generated for the LVT1 secondary source by IC3 and PC1
turning on/off.
- The secondary 12V depends on the ZD1 value.
- The 12V for the LVT1 secondary source is transformed to DC 5V through IC4
13-2