Flow Chart Of Troubleshooting - Samsung SCH-i830 Service Manual

7. Flow Chart of TroubleShooting

7-1. Logic Section
7-1-1. Power On
PDA Part
4pin = 3.0V , 23pin = 1.3V
25pin = 1.1V , 33pin = 1.4v
Insert Power
NG
2pin in U400
NO
> 3.4V
YES
4pin in U401 NO
= High
YES
3pin in U405 NO
= High
YES
34,35pin IN U405
= High
YES
In U405
YES
Check
Other Power Circuit
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Change Batt.
Check U401 &
Neighboring Circuits
Check U405 &
Neighboring Circuits
NO Check U429,UCP201
& Neighboring Circuits
NO
Neighboring Circuits
7-1
Check U401 &