LG CM9530 - Lighting (Front; Woofer Speaker)

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ELECTRICAL TROUBLESHOOTING GUIDE
CD/ USB play
Check Front / Woofer SPK.
Replace IC204.
Check SMPS board.
CN100 ~ CN103
Pin3 5V OK?
NO
NO
Check IC204.
4. NO LIGHTING (FRONT/ WOOFER SPEAKER)
YES
YES
Check SMPS board.
Check IC501.
CN100 ~ CN103
Pin1,2 +12 V OK?
CN100 ~ CN103
Pin6,7 I2C signal OK?
NO
NO
YES
YES