Samsung SCH-i830 Service Manual page 30

Flow Chart of Troubleshooting
PHONE Part
Phone ON
NG
2pin in U302
= High
NO
4pin in U803
= High
YES
31pin in U900
=High
YES
Output Powers
in U405 OK?
YES
Check UCP800 & OSC200
Neighboring Circuits
YES
Check UME300 &
Neighboring Circuits
NO
NO
NO
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
1pin in U803
= High
YES
Check U803
Check UCP800 &
Neighboring Circuits
Check U900
Neighboring
Circuits
7-4
Check U900
NO
Neighboring
Circuits