Key Data Input - Samsung SGH-E740S Service Manual

9-7. Key Data Input

Check Initial Operation
When one of the keys is
pushed,
Isn't it displayed on LCD?
When one of the keys is
KEY_ROW(0,4),
KEY_COL(0,4)
signal is OK?
Yes
Yes
pushed,
Yes
END
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No
Check the Dome sheet & Key Pad
No
Replace the PBA
9-15
Flow Chart of Troubleshooting