Key Data Input - Samsung SGH-E890 Service Manual

Flow Chart of Troubleshooting

9-7. Key Data Input

Check Initial Operation
When one of the keys is
pushed,
is it displayed on LCD?
When one of the keys is
pushed,
KEY_ROW(2)~(4)
KEY_COL(2)~(4)
signal is OK?
Yes
Yes
Yes
END
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No
Check the Dome sheet & Key Pad
No
Replace the PBA
9-14