Key Data Input - Samsung SGH-S500 Service Manual

5-7 Key Data Input

Check Initial operation
one of the keys is pushed,
is it displayed on LCD
one of the keys is pushed,
KBID signal is OK?
5-13
Yes
When
Yes
When
Yes
END
No
Check the Dome sheet & Key Pad
No
Replace the PBA
Flow Chart of Troubleshooting and Circuit Diagrams