Key Sense Trouble - LG L602i Service Manual

4. TROUBLE SHOOTING

4.10 Key Sense Trouble

Key Sense sequence of L602i is :
Default condition ROW(0-4) is 2.7V -> Press the key -> Corresponding row(x) and col(x)
go to 0V -> Key sensing
Start
Change the side key
pcb
Work well?
NO
Check the RA600,
R617 with no key press
ROW(0-4) is 2.7V?
YES
Check the RA600,
R617 with key press
NO
Change the Main board
- 98 -
Yes
End
NO
Check RA600,R617