LG DR165 Service Manual page 20

No 5.2V
YES
Is the VCC (5.3V) supplied to Q151
Emitor ?
YES
Is there about 0V at D153 and Q156
Collector ?
YES
Is there about 5V at R171 and 0.7V at
Q156 Base ?
YES
Check Q156 and Replace
No 5VT
YES
Is the VCC (5.3V) supplied to Q155
Emitor ?
YES
Is there about 0V at D152 and Q152
Collector?
YES
Is there about 5V at R180 and 0.7V at
Q152 Base?
YES
Check Q152 and Replace
NO
Check 5.3VA on SMPS Board
NO
NO
Check the 'PWR CTL H' signal from
µ-COM
NO
Check 5.3VA on SMPS Board
NO
NO
Check the 'TIMER H' signal from µ-COM
3-5
Check Q151 and Replace
Check Q155 and Replace