LG CM9730 - No Lighting (Woofer Speaker)

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ELECTRICAL TROUBLESHOOTING GUIDE
CD/ USB play
Check Woofer SPK.
Replace IC605.
Check SMPS board.
CN803,
CN804 Pin1 +3.3 V
OK?
NO
NO
Check IC605.
4. NO LIGHTING (WOOFER SPEAKER)
YES
YES
Check SMPS board.
Check IC501.
CN803,
CN804 Pin8 +12 V
OK?
CN803,
CN804 Pin3,7 I2C signal
OK?
NO
NO
YES
YES