LG KU950 - Key Sense Trouble

4. TROUBLE SHOOTING
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4.11 Key sense trouble
Key Sense sequence of KU950 is :
Default condition ROW(0-2) is 2.7V → Press the key → Corresponding ROW(x) and COL(x) go to
0V → Key sensing
Side Key
R901R900 R902
Check Metal DOME SHEET
Check the R900,R901
R902 with no key press
Change the Main board
Yes
NO
Change the side key
Check the R900,R901
R902 with key press
ROW(0-4) is
2.7V?
Check R900,R901,R902
NO
YES
Yes
ROW(0-4),
COL(0-4) is 0V?
Work well?
End
NO
START