Samsung SGH D900i Service Manual - Page 54
Key Back Light
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9-10. Key Back Light Main Key LED does not work Yes U402 pin50 = "H"? Yes U402 pin50 = 3.3V ? Flow Chart of Troubleshooting No Check the U402 related to "VDD_KEY" Change U402 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
Main Key LED does not work
Yes
No
Check the U402 related to "VDD_KEY"
U402 pin50 = "H"?
Yes
Change U402
U402 pin50 = 3.3V ?
END