IQ449 service manual
TROUBLE SHOOTING GUIDE
Cannot switch on
Phone connect current
is about 50-100mA and
cannot switch on
Update software
NO
Check and replace
I/O connector
NO
YES
NO
Check power output：
Centre supply VCORE 1.2
V
Logical supply VDD28 2.8V
Audio supply VDD18 1.8V
Memory supply VMEM 1.8V
RTC supply: RTCVDD 2.8V
YES
Check and replace SYS Clock
26MHz
32.768kHz
NO
Replace or
re-solder memory
NO
Replace SC7710
End
YES
NO
Replace or
re-solder
the BB chip
SC7710
YES
NO
YES
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Summary of Contents for IQ449
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Page 10: ...IQ449 service manual SYSTEM BLOCK DIAGRA All manuals and user guides at all guides com...
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Page 15: ...IQ449 service manual BT WIFI circuit All manuals and user guides at all guides com...
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