LG SPH7B-W - Portable Function Doesnt Working

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ONE POINT REPAIR GUIDE
16. PORTABLE FUNCTION DOESN’T WORKING
16-1. IC200
16-1-1. Solution
Replace IC200 on MAIN board.
16-1-2. How to troubleshoot (Countermeasure)
1) Check VCC_5V of L200. If VCC_5V is abnormal, follow the stage 3-1 (IC306).
2) Check D_3.3V of L201. If D_3.3V is abnormal, follow the stage 6-1 (IC304).
3) If VCC_5V and D_3.3V are OK, check the PTB_DET is high state when portable cable connected (pin7
or 8 of R115).
If it’s Low, follow the stage 9-1 (IC100).
4) When you followed above step but It doesn’t work, check the around parts. (Resistor, Capacitor, Bead).
If it still doesn’t work, replace the IC200.
16-1-3. Service hint (Any picture / Remark)
< MAIN board top view >
JK200
JK200
IC200
IC200