LG NP8540 - One Point Repair Guide; If Not Booting When You Turn on the Set. and Led Doesnt Turn on

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ONE POINT REPAIR GUIDE
1. IF NOT BOOTING WHEN YOU TURN ON THE SET. AND LED DOESN’T TURN ON.
1-1. IC903 (NO 5.2 VA)
1-1-1. Solution
Replace IC903 on main board.
1-1-2. How to troubleshoot (Countermeasure)
1) Please Check 18 VA of IC903 Pin2(IN)
2) If 18 VA is abnormal, check the parts. (JK900, F900, C905, D901, L902, C917, C922, C919).
And then change the weird one.
3) If 18 VA is OK, but 5.2 VA is abnormal at the L906 replace IC903.
1-1-3. Service hint (Any picture / Remark)
< Main board top view >
IC903
IC903