Level 3 Repair
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8-5
8-3-1. Power On
Check the TACT500
(soldering crack, open, etc)
Mobile phone does not power on.
Change the TACT500(Power-key switch)
And retry to the power-on operation.
END
No
Yes
Check the U403 output voltage
(C416 > 1.8V, C418 > 1.2V)
If the output voltage is not satisfied with normal
condition, Change the U406.
※
Each voltage level has ±10% margin.
No
Yes
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 OSC400
Is that frequency 32.768Khz?
Change the OSC400.
If OSC400 does not still work, Change the U406
This problem is internal oscillator of U406.
※
Test condition (Oscilloscope setting)
: 20.0us.div (time division)
No
Yes
Yes
Change the FRONT-LCD ASSY
Power-on the phone and
check the power-on sound
or motor Vibration.
Yes
No
Summary of Contents for GT-I8190
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