LG SJ9 Service Manual page 43

NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE OR
"HELLO" ON FRONT PANEL
When you turn on your set, it will blank / no message on front panel, and stand-by LED doesn't work.
1-2. IC303 System 3.3 V (No 3.3 VA)
1-2-1. Solution
Replace MAIN/ FRONT board.
1-2-2. How to troubleshoot (Countermeasure)
1) Please check 3.3 VA of IC303 pin3.
2) If 3.3 VA is abnormal, replace MAIN board.
3) If 5.1 VA is OK, replace FRONT board.
1-2-3. Service hint (Any picture / Remark)
ONE POINT REPAIR GUIDE
< MAIN board top view >
 
IC303 IC303
 
3-6
 
L304 L304