Samsung SGH-E390 - Key Data Input

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Flow Chart of Troubleshooting
9-12
9-7. Key Data Input
When any key input is
given,
is there something on LCD
(display)?
Check the Dome sheet & Key Pad
END
No
Yes
Yes
Check Initial Operation
When one of the keys is
pushed,
KBIO signal is OK?
Replace the PBA
No
Yes