Flow Chart of Troubleshooting
7-10. Key Back Light
Main Key LED does not work
U700 pin4 = "H"?
VBAT
KEY_LED_ON
Yes
Yes
END
U700
3
VIN
4
VOUT
2
GND
5
NC
1
STBY
GND
6
C701
R701
2.2UF
56
LED701
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No
Check the UCP200 related to
"KEY_LED_ON"
KEY_LED
R702
R703
R705
R706
R707
56
56
56
10
56
LED705
LED703
LED704
LED702
LED706
7-22
R704
R708
R709
R710
R711
R712
56
10
56
56
10
56
LED710
LED711
LED712
LED709
LED707
LED708