Key Back Light - Samsung SGH-E360 Service Manual

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