Huawei Y511-U030 - Page 41

XXXX The basic version Repair ManualV1.0
internal public
2013-09-25
华为机密，未经许可不得扩散
第 41 页，共 79 页
Boot failure using external
power to supply PCBA,
observe the change of the
current
Current is too
small, about
10mA
Current basic
normal, about
20mA
Current large
hundreds of mA
Check the 26MHz
master clock signal
are normal
To replace or re
welding of 26MHz
crystal, CPU
Check the
32.768Khz clock
signal are normal
replace or re weld
the side the clock,
CUP
Check VDD-CORE, VDDIO,
VDD MEM, VRF the voltage
is normal
Check CPU, Flash has no
weld and damage
Re download the software
END
Inspection of all
VBAT related
circuit device,
change adverse
replace or re
welding of CPU
replace or re
welding of
CPU. FLASH
Unable to download
click download bad
repair process
Y
N
Y
N
Y
N
N
Y
Y
N