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