Advertisement
Cannot switch on
Check and replace
I/O connector
YES
TROUBLE SHOOTING GUIDE
Phone connect current
is about 50-100mA and
cannot switch on
Update software
NO
Check power output：
Centre supply VCORE 1.2V
Logical supply VDD28 2.8V
NO
Audio supply VDD18 1.8V
Memory supply VMEM 1.8V
RTC supply: RTCVDD 2.8V
Check and replace SYS Clock
32.768kHz
26MHz
NO
Replace or
re-solder memory
NO
Replace SC7710
NO
NO
Replace or
re-solder
the BB chip
YES
NO
End
IQ449 service manual
YES
SC7710
YES
YES
Advertisement
