SGH-P730 Flow Chart of Troubleshooting and Circuit Diagrams
2-
11
7. Key Data Input
Check soldered status of
CN302 and connecting
status between KEY-FPCB
and PBA
Check the Initial Operation
END
Yes
When "#"pad pressed,
Pin 11 of
CN302=2.8V(high)?
Yes
Resolder CN302 or change FPCB
No
Check U401
No
Yes
Check the Keypad &
Dome Sheet
Replace or Adjust
the Keypad & Dome Sheet