Initial - Samsung SGH-E790 Service Manual

Flow Chart of Troubleshooting

3-1-2. Initial

Initial Failure
The pin #A6 of U101 =
1.8V and
the pin #D6 of U101 =
Is the pin #P5 of U100
"Low → High" ?
There is 32.768kHz wave
forms at the C106 and
The voltage is "High" at
the C120,C121,C122
LCD display is O.K?
Sound is O.K?
Yes
2.8V ?
Yes
Yes
C105
Yes
Yes
Yes
Yes
Yes
END
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①
No
Check the
(if it has some problem, it is to be replaced.)
①
No
Check the
(if it has some problem, it is to be replaced.)
①
No
Check the U100
①
No
Check the U100
No
Check the LCD part
No
Check the Audio part
3-4
U100
U100