LG SJ7 - Primary Unit

3-6
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Only for training and service purposes.
ONE POINT REPAIR GUIDE
PRIMARY UNIT
NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE OR “HELLO” ON
FRONT PANEL
1-2. IC301 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 IC301 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)
< MAIN board top view >
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IC301
IC301
L301
L301
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