Samsung PLK405WX/XAC Service Manual page 37

Troubleshooting
6-2 No Power
6-2
Timer LED, lamp
LED, or abnormal temperature
LED on?
No
Press
the power switch
Check IC901
micom pin 37:LOW(0)
Yes
Check Connector
AP1 pin 3: HIGH
Yes
Check REL801
Yes
Check the AC
voltage of D803, IC801
Yes
Check the voltage on
each pin of power circuit
Yes
See LED
Display Check
No
Check/Replace
IC901
No
Check /Replace
Q908, R961, R747
No
Check/Replace Q804,
R838, R835, REL801
No
Check /Replace
F801,Line Filter
Samsung Electronics