Sharp SGH-J200 - Manual (Page 54)

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Flow Chart of Troubleshooting
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9-23
9-13. Key Back Light
Key Backlight does not work
Yes
Is BACKLIGHT set
AlwaysON in the Menu?
No
Set BACKLIGHT on AlwaysON
Yes
VKEY_3.3V ≒ 3.3V?
Yes
No
Replace or Resolder U600
END