Samsung SGH-i560V Service Manual page 57

9-1-4 : Abnormal 3X4 KEY operation
Press the key
KBR# level
goes high to low?
YES
KBC# level
goes low to high?
END
KBC0
KBC1
KBC2
VCC_KEY_3.3V
HEA800
1 1 2
2
34 3
4
5 5 6
6
78 7
8
9 9 10
10
11 11 12
12
13 13
14 14
15
15 16 16
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Check idle state level
NO
and neighboring circuit
NO
Check idle state level
and neighboring circuit
9-13
Flow Chart of Troubleshooting
KBR0
KBR1
KBR2
KBR3