Level 3 Repair
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8-7
8-3-1. Power On
Mobile phone does not power on.
Check the ANT7000,ANT7001
(soldering crack, open, contact,
etc)
and Check PHONE_ON_N =
low
Change the ANT7000(Power-key)
And retry to the power-on operation.
If it't doesn't work, check the power key FPCB
END
No
Yes
Check the C7018(VPH_PWR) =
3.8~4.3V
Yes
Check the Battery Voltage.
Is it more than 3
.
8V?
Charging the battery by TA.
If its voltage level is extremely low(under 3.0V),
Change the battery.
check the initial operation
Abnormal
Check the Clock OSC7000
Is that frequency 19.2Mhz?
1) Change the OSC7000.
※
Test condition (Oscilloscope setting)
: 20.0us.div (time division)
2) Check the output voltage of U7001
(C7040 = 0.95V, C7043 = 1.3V, C7047 = 1.8V,
C7051 = 2.15V)
If the output voltage is not normal, Change the
U7001.
※
Each voltage level has ±10% margin.
No
Yes
Yes
Change the FRONT-LCD ASSY
Power-on the phone and
check the power-on sound
or motor Vibration.
Sound or Vibration is ok?
Yes
No
1. Check the V_BAT voltage(3.8~4.3V)
2, If the output voltage is normal, Change the
U7000.
No
Yes
