LG LAS855M - Portable

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ELECTRICAL TROUBLESHOOTING GUIDE
6. PORTABLE
Signal should be flow
(C203, C204).
L207 should be 3.3 V.
Check cable.
YES
YES
YES
YES
NO
NO
L204 should be 5 V.
Check CLK
(R215, R216, R220).
Check power.
Check MPEG (IC501).
Check AMP.
Replace IC200.
NO
NO
‘Portable’ should be displayed, when portable cable is connected well.
Even though all of above things are OK, there is no sound.