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SAMSUNG Proprietary-Contents may change without notice
SGH-i300 Flow Chart of Troubleshooting and Circuit Diagrams
2-12
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2-8. Key Matrix Part
Check key initial
operation
Yes
END
Check the
Pin 3,5,7,9,11 of
CN602 is High
Check the R126,
R127,R128,R129,
R142,R143
No
Yes
No
Replace the main key
PCB
Yes
When one of the
main keys is pushed
one of pin 3,5,7,9,11 of
CN602 is High?
No
Replace the main key
PCB
Yes
When one of the
side keys is pushed
one of pin 3,5,7,9,11 of
CN602 is High?