LG DR165 Service Manual page 23

No SW_5.3VA
YES
Is the VCC (5.3V) supplied to Q158
Emitor?
YES
Is there about 0V at R179 and R156 ?
YES
Check Q158 and Replace
No 1.8V(SAA7137)
YES
Is the VCC (3.3V) supplied to Q159
Emitor And IC154 pin 1, 2, 8 ?
YES
Is there about 3V ~ 3.3V at Q159 Base
and IC154 pin 3 ?
YES
Check IC154 and Replace
NO
Check 5.3VA on SMPS Board
NO
Check the 'STANBY H' signal from µ-COM
NO
NO
3-8
Check 3.3V power supply
Check Q159 and Replace