LG CM8440 Series - Page 52

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ELECTRICAL TROUBLESHOOTING GUIDE
USB play
Replace IC300.
NO
IC300
USB power +5 VU
OK?
YES
A
A
When insert USB,
IC501 PinU7,U8,A7,A8 USB_D
signal OK?
NO
YES
YES
YES
YES
AUX
Check audio cable.
Replace IC202.
Check IC501.
NO
NO
NO
IC202
Pin7, 8 AUX input signal
OK?
IC202 Pin41
ADC/MIC_data output signal
OK?
IC202
Pin42,43,44 I2S input signal
OK?