Key Back-Light Illumination - LG KG110 Service Manual

VMEM VMEM VMIC
C231
39p
R232
0
3
GND
2
VCC
R233
1
IN
C233 0
39P
U204
NLAST4599DFT2G
R238
NA

3.3.9 Key Back-light Illumination

In key back-light illumination, there are 6 Blue LEDs in Main Board, which are driven by
KEY_BACKLIGHT signal from AD6720.
VBAT
VMEM VMIC_N VMEM
R231
100K
VMIC_ON
R235
R234
NA
1M
R236 R237
1K 2.2K
+
C234 C235
10u
39P
C236 10u
HEADSET_SPK_P
R242
JACK_DETECT
R243
HEADSET_MIC_P
C237
39P
Figure 3-11: Headset Jack Interface
KEY BACKLIGHT
(6 LIGHT)
Figure 3-12: Key Backlight Illumination
25
EAR JACK
VMEM
C232
39P
VIN-
4
-
VCC R239 0
1
HOOK_DETECT
VIN+ OUT
GND
+
3
U205
LMV7291MGX-NOPB
R240
510K
R241 4.7
0
4.7
R244 C238
39P
33K
3. TECHNICAL BRIEF
J200
5
1
3
4
2
. .
KEY BOARD_BACKLIGHT