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Flow Chart of Troubleshooting
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7-21
7-10. Key Back Light
U700 pin6 = "H"?
Check the U200 related to "KEY_LED_ON"
END
No
Yes
Yes
Main Key LED does not work
Typical 3.7V
KEY_LED
R711
56
LED709
LED703
R709
56
LED701
56
R700
R707
56
LED706
R704
56
VDD
VOUT
3
VBAT
6
CE
2
GND
GND
5
4
NC
1
U700
LED710
R701
56
R703
56
LED711
AOT-0603P-W03-X
LED708
C700
56
R705
LED707
56
R702
56
R706
LED705
LED700
LED702
R708
56
LED704
R710
56
KEY_LED_ON