LG KU950 - Keypad Backlight

3.10.7. Keypad backlight
There are 10 White LEDs on Top side of Main PCB and 6 White LEDs on Top side of key PCB in
board backlight circuit and, which are driven by KEYBD_BACKLIGHT line form PM6650. Key Pad
backlight controlled by PM6650.
3. TECHNICAL BRIEF
- 58 -
Figure. Schematic of main PCB keypad backlight circuit
8
1
KEY MATRIX
(JAVA)
47
*
25
39#
(MENU)
(VT CALL)
6
0
906
907
902
51KR902
905
st
51KR901
sh
901
908
900
HOT901 904
51KR900
HOT900
HOT902 909
903
VREG_MSMP_2.7V
KEY_COL[3]
KEY_ROW[0]
KEY_COL[0]
KEY_COL[4]
KEY_COL[1]
KEY_COL[2]
KEY_ROW[1]
KEY_ROW[2]
KEY BACKLIGHT LEDs
VA908
EVL14K02200
68R916
R914 68
SSC-TWH104-HLS
LD904
68R918 68R911
+VPWR
LD910
SSC-TWH104-HLS
LD905
SSC-TWH104-HLS SSC-TWH104-HLS
LD900 LD901
SSC-TWH104-HLS
R910 68
LD902
SSC-TWH104-HLS
R917 68
R919 68
R912 68
LD906
SSC-TWH104-HLS SSC-TWH104-HLS
LD907
LD908
SSC-TWH104-HLS
68R915
R920 68
SSC-TWH104-HLS
LD909
KYPD_LED_EN
Figure. Schematic of key PCB keypad backlight circuit
ON_SW
VA100
EVLC18S02015
SND
EVLC14S02050VA104
R100
51K
VA106 EVLC14S02050
END
VA105 EVLC14S02050
HOT100
VA103 EVLC14S02050
VREG_MSMP_2.7V
CLR_BACK
EVLC14S02050VA102
HOT101
EVLC14S02050VA107
KEY_COL[2]
KEY_COL[0]
KEY_COL[3]
PM_ON_SW_N
KEY_ROW[3]
KEY_COL[1]
KEY_COL[2]
KEY_COL[0]
KEY_COL[3]
KEY_ROW[3]
KEY_ROW[4]
KEY_COL[1]
KEY PCB BACKLIGHT LEDs
+VPWR
R107 68
SSC-TWH104-HLS
LD101
EVL14K02200
VA101
R108 68
LD103
SSC-TWH104-HLS
R106 68
SSC-TWH104-HLS
LD102
SSC-TWH104-HLS
LD100
R126 68
68R125
SSC-TWH104-HLS
LD105 LD104
SSC-TWH104-HLS
68R105
KYPD_LED_EN