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Flow Chart of Troubleshooting
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7-21
7-12. Sub Key Back Light
U823 pin 1 = H ?
Check the U823 related to
"SLIDER_KEY_ON" signal
END
No
Yes
Yes
Main Key LED does not work
U8236 pin 4 = H ?
No
Replace U823
Yes
Typical 3.8V
KEY_LED
L
E
D
8
0
1
R801
91
VR810
91
R807
R837
R806
91
C853
VIN
4
VOUT
U823
2 GND
GND
6
SEL
5
STBY
1
3
L
E
D
8
0
7
L
E
D
8
1
0
91
R802
L
E
D
8
0
5
VBAT
SLIDER_KEY_ON