Samsung SGH-X640 Service Manual page 36

Flow Chart of Troubleshooting
7. Key Data Input
Check Initial Operation
Yes
No
When one of the keys is
Check the Dome sheet & Key Pad
pushed,
is it displayed on LCD?
Yes
No
When one of the keys is
Replace the PBA
pushed,
KBIO signal is OK?
Yes
END
7-12
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