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Flow Chart of Troubleshooting
7-10. Key Back Light
Main Key LED does not work
U700 pin6 = "H"?
Typical 3.7V
U700
1
6
KEY_LED_ON
CE
VIN
2
5
VSS
NC
3
4
NC
VOUT
7
Yes
Yes
END
VBAT
C701
C700
R700
R701
R702
LED705
LED706
LED702
KEY_LED
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No
Check the UCP200 related to
"KEY_LED_ON"
R703
R705
R706
R707
LED700
LED703
LED707
LED708
7-20
R704
R708
R709
R710
LED701
LED704
LED709
LED710
R711
LED711
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