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Flow Chart of Troubleshooting
9-18
9-10. Key Back Light
Is Backlight Set "Always
On" in the menu?
Set " Backlight" on "Always On"
END
No
No
No
Yes
Yes
Main Key LED does not work
C513 = 3.3V ?
U507 pin6=2.8V?
Replace U507
Replace UCP300(MSM6250A)
Yes
Yes