Main Key El Sheet Part - Samsung SGH-E780 Service Manual

Flow Chart of Troubleshooting

9-11. Main Key EL sheet part

Main key LED does not work
Yes
No
Check the 4 pin of U707
Check the U707
is high
Yes
No
Check the 6 pin of U709
Check the U709
and C754
Yes
Is it working?
Yes
END
9-17
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