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Flow Chart of Troubleshooting
7-11. Key Back Light
Main Key LED does not work
U716 pin 1 = H ?
U716 pin 4 = H ?
typical 3.8V
VBAT
KEYLED_ON
C753
Yes
Yes
Yes
END
+VDD_BL
U716
5
1
STBY
SEL
2
4
GND
VOUT
3 VIN
GND
6
C754
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No
Check the U716 related to "KEYLED_ON"
No
7-20
signal
Replace U716
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