LG DR1F9H Service Manual page 24

No SW_12VG
YES
Is VCC (14V) supplied to Q165
Collector ?
YES
Is 12.5V at ZD152 & Q165
Base ?
NO
Is VCC (33V) supplied to Q160
Emitor ?
YES
Is there 0V at Q160 Base ?
NO
Is 5.3V at Q166 Base ?
YES
Check Q166 and Replace
NO
Check D124 on SMPS Board and Replace
YES
NO
Check D126 on SMPS Board and Replace
YES
NO
3-9
Check Q165 and Replace
Check Q160 and Replace
Check SW_5.3VA