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Flow Chart of Troubleshooting
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10-23
10-11. Key Back Light
key Backlight does not work
Replace LED
Yes
OK
Not OK
Replace PMU300
Check V_KEY_3.3V
Yes
Yes
No
END
Set BACKLIGHT on Always ON
Is BACKLIGHT set AlwaysON
in the Menu?
LED500
R511
LED502
R513
R512
LED501
LED503
VDD_MAIN_KEY_3.3V
R510