Advertisement
Stand-by short time
Change battery
Connect the phone with Voltage
regulator, the current should be zero
Power on the phone, check
the if working current be
normal（no exceed 1000mA）
Check if the idle current be
normal（0mA or little more）
Check if the components on the
PCB are damaged, capacitor,
power supplier, etc.
Defective resolved
Stand-by short time
Re-flash SW
NO
YES
YES
YES
NO
Replace RF IC、BT IC
、CPU
NO
By touch to
NO
NO
find the
component
getting hot,
replace it.
NO
NO
YES
NO
IQ449 service manual
Check and
replace
RF- PA,
AUDIO-PA
YES
YES
YES
Advertisement
