Samsung SGH-E250D W Service Manual page 41

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Flow Chart of Troubleshooting
9-10. Key Back Light
Main Key LED does not work
Yes
No
Check the U401, U404 related to
U401, U404 pin6 = "H"?
"VDD_KEY"
Yes
U401, U404 pin3 = 3.3V ?
Change U401, U404
END
9-16
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