Samsung SGH-E340 - Key Back Light

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Flow Chart of Troubleshooting
7-18
7-10. Key Back Light
U604 pin1 = H ?
Check the U200 related to "VDD_KEY"
END
No
Yes
Yes
Main Key LED does not work
LED603
LED613 LED612
LED610 LED605
LED614
VBAT
56
R61 9
R610
56
56
R62 0
LED601
R621
56
LED602
56
R615
56
R622 R616
LED606
56
R633
56
LED616
LED609
R618
56
R61 3
56 56
R609
56
R614
LED604
LED617
LED60 7
R612
56
LED615
LED608
R617
56
R623
56
56
R611
C613
R624
56
CE
6
GND
2
5
GND
NC
4
VDD
1
VOUT
3
LED611
U604
KEY_LED_ON