Key Sense Trouble - LG U310 Service Manual

4.11 Key Sense Trouble

Key Sense sequence of U310 is :
Default condition ROW(0-4) is 2.7V -> Press the key -> Corresponding row(x) and col(x)
go to 0V -> Key sensing
Side Key
Start
Change the side key
PCB
Work well?
NO
Check the RA600,
R606 with no key press
ROW(0-4) is 2.7V?
YES
Check the RA600,
R606 with key press
NO
Change the Main board
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4. TROUBLE SHOOTING
Yes
End
NO
Check RA600,R606
R606
RA600