LG KU950 Service Manual page 51

3. TECHNICAL BRIEF
3.10.4. Keypad
KU950 has 20 buttons, 5 tact switches and 3 side keys. Figure shows the Keypad circuit. 'END' Key is
connected to PM_ON_SW_N to PM6650 and GPIO76 of MSM6275.
COL0
HOT900
ROW0
(DVB-H)
HOT901
ROW1 DVB-H)
HOT902
ROW2
(MENU)
ROW3 SEND
ROW4 LEFT
VREG_MSMP_2.7V
HOT900
(VT CALL)
KEY_ROW[0]
HOT901
(JAVA)
KEY_ROW[1]
HOT902
(MENU)
KEY_ROW[2]
KEY_COL[0]
KEY_COL[1]
KEY_COL[2]
KEY_COL[3]
KEY_COL[4]
KEY MATRIX
R111 680 A
LEFT KEY_COL[0]
R123 680
E
SELECT KEY_COL[4]
R114 680
B
DOWN KEY_COL[3]
TACT SWITCH
COL1
1
2
3
HOT100
UP
Table. Key Matrix Mapping Table
900 901 902 st
1 4 7 *
903 904 905 906
2 5 8 0
907 908 909 sh
3 6 9 #
VREG_MSMP_2.7V
R110
51K
SW100
C R112 680
KEY_COL[1] UP
COM1
R113 680
D
KEY_COL[2] RIGHT
R115 680
KEY_ROW[4]
Figure. Schematic of keypad
COL2 COL3
4 7
5 8
6 9
HOT101 SEND
RIGHT DOWN
VREG_MSMP_2.7V
R100
51K
KEY_ROW[3]
KEY_COL[0]
KEY_COL[1]
KEY_COL[2]
KEY_COL[3]
KEY_ROW[4]
KEY_ROW[3]
KEY_COL[0]
KEY_COL[1]
KEY_COL[2]
KEY_COL[3]
CN900
5
4
3
2
1
- 52 -
COL4 COL5
SIDE
*
VOLUME UP
SIDE
0 VOLUME
DOWN
SIDE
#
CAMERA
CLR_BACK Side Key
SELECT
SND HOT100 HOT101 CLR_BACK
END
PM_ON_SW_N
VA100
EVLC18S02015
ON_SW
R903 100ohm
SIDE_VOLUME_UP_KEY
KEY_ROW[0]
R904 100ohm
KEY_ROW[1] SIDE_VOLUME_DOWN_KEY
R905 100ohm
KEY_ROW[2] SIDE_CAMERA_HOT_KEY
R906 100ohm
KEY_COL[5]
SIDEKEY KEYPAD