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Flow Chart of Troubleshooting
7-22
7-10. Key Back Light
U606 pin3 = H ?
Check the U200 related to "VDD_KEY"
END
No
Yes
Yes
Main Key LED does not work
KEY_LED
LED604
75
R613
2
6
GND
NC
5
1 STBY
VIN
3
VOUT 4
U606
GND
R616
75
R611
75
LED601
LED603
LED606
75
R615
C622
LED602
R607
75
R612
LED600
LED605
75
R618
LED607
R619
75
75
R614
VBAT
KEY_LED_ON