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BT+FM chip cannot work normally
BT、FM can't open，
Can't work normal
Software update and check
the function is OK or not
Check U7100 Pin6 have
2.8V supply voltage or not
Check C7103 have 1.8V
supply voltage or not
Check C7100 have 26MHz clock
signal output or not by
oscilloscope (OSC)
Re-solder or Replace U7100
Re-solder or Replace SC7710
END
YES
YES
NO
NO
YES
NO
YES
NO
YES
YES
IQ449 service manual
Software update
Measure U0100 PIN
M10 is 2.8v or not
Replace C7103
Replace R7102
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