Samsung SGH-T429 Service Manual - Page 49
Key Back Light
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9-10. Key Back Light Main Key LED does not work Yes U300 pin6 = "H"? Yes U300 pin3 = 3.3V ? Flow Chart of Troubleshooting No Check the U300 related to "VDD_KEY" Change U300 END 9-17 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
SAMSUNG Proprietary-Contents may change without notice
Flow Chart of Troubleshooting
This Document can not be used without Samsung's authorization
9-17
9-10. Key Back Light
U300 pin6 = "H"?
Check the U300 related to "VDD_KEY"
END
No
Yes
Yes
Main Key LED does not work
U300 pin3 = 3.3V ?
Change U300