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8-3-1. Power On
Cell-phone can`t power on.
Check the Battery Voltage.
Is it more than 3.4V?
Check the PWR key-FPCB
(open, etc)
Power-on the phone and check
the power-on sound.
Sound is ok?
Check U7002 output voltage
(C7017>0.8V, C7064>0.8V,
C7045 ≥ 1.8V, C7005 ≥ 1.2V)
Check the Clock
OSC7000(C7042)
Is that frequency 32KHz?
check the initial operation
END
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Yes
Yes
No
Yes
Yes
Yes
No
Charging the battery by TA.
Abnormal
Change the key - FPCB
And retry to the power-on operation.
Yes
Change the FRONT ASSY
If the output voltage is not satisfied with normal
No
condition, Change the U7002
Change the OSC7000
If OSC700 does not still work, Change the U7002
This problem is internal oscillator of U7002.
No
※ Test condition (Oscilloscope setting)
: 20.0us.div (time division)
8-5
Level 3 Repair
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