cromax X458, Service Manual, Page: 34 / 48

X458 L3 Service Manual
34
Stand-by short time
YES
Connect the phone with Voltage
regulator, the current should be zero
Check if the idle current be
normal
（
0mA or little more
）
Replace
CPU
Stand-by short time
Power on the phone, check
the if working current be
normal
（
no exceed 600mA
）
Defective resolved
YES
YES
YES
Check and
replace
RF- PA,
AUDIO-PA,
NO
NO
YES
Check if the components on the
PCB are damaged, capacitor,
power supplier, LDO, etc.
By touch to
find the
component
getting hot,
replace it.
Change battery Re-flash SW
NO
NO
YES
YES
NO
NO
NO
NO
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