User Guide

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SGH-C120 Flow Chart of Troubleshooting
2-5
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2-1-2. Initial
Initial Failure
The pin #G11 of U101 =
1.8V and
the pin #J12 of U101 =
2.8V ?
Check the U300
(if it has some problem, it is to be replaced.)
Yes
No
Is the pin #K9 of U101
"Low
→
High" ?
Yes
No
Check the U300
(if it has some problem, it is to be replaced.)
There is 32.768kHz wave
forms at the C216 and
C217
Yes
No
Check the U200
Is the pin #A4 of U300
is "High"
The voltage is "High" at
the C313,C315,C316
Check the U300
Check the U100
LCD display is O.K
No
No
Yes
Yes
Yes
Check the LCD part
No
Sound is O.K
Yes
No
Check the Audio part
END
Yes
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