
X458 L3 Service Manual
19
Cannot power on-current swing instability
YES
NO
NO
YES
YES
NO
YES
NO
NO
NO
NO
26MHZ Check and
replace system
clock
:
26MHz
Make the phone connect the power
supply and find the current swing at
50-100mA
END
Check the power manage
supply output
:
VCCRE 1.8V
VDD 2.8V
AVDD 2.8V
VTCXO 2.8V
VMEM 2.8V
VRTC 1.2V
Replace U101
MT6260
Upgrade the
software
Check and
replace the I/O
connector
Replace or reweld
flash
Replace or
reweld CPU
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Summary of Contents for X458
Page 13: ...X458 L3 Service Manual 13 All manuals and user guides at all guides com ...
Page 14: ...X458 L3 Service Manual 14 Output of SIM Card All manuals and user guides at all guides com ...
Page 17: ...X458 L3 Service Manual 17 Display interface All manuals and user guides at all guides com ...
Page 48: ...X458 L3 Service Manual 48 All manuals and user guides at all guides com ...