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