Samsung SGH-Z500 Anycall Service Manual page 47

6. Key Data Input
Check Initial Operation
When one of the keys is
pushed,
is it displayed on LCD?
When one of the keys is
KEY_IO signal is O K?
Yes
Yes
pushed,
Yes
END
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No
Check the Dome sheet & Key Pad
No
Replace the PBA
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F low Chart of Troubleshooting