Sharp SGH-F250 - Manual (Page 48)

SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting
9-20
9-9. Key Back Light
Main Key LED does not work
Yes
No
Reconnect the key FPCB
Check the key FPCB
connector on PBA
Yes
Change key FPCB IS key FPCB ok?
END