Qwerty Key Trouble - LG LG511C Service Manual

LN510

4.3.7. QWERTY Key Trouble

U5001
BU1851GUW
B3
+2.6V_MSMP2 VDD1
B4
VDD2
C2
VDD3
D2
VDD4
A1
TESTM0
F1
TESTM1
F6
TP5001
TESTM2
A6
TESTM3
C1
QKEY_INT/
KINT
E1
QKEY_I2C_SCL
KSCL
D1
QKEY_I2C_SDA KSDA
A2
QKEY_RESET/ XRST
C4
PORENB
C3
VSS1
D3
VSS2
D4
VSS3
TP1
LG Electronics Inc.
+2.6V_MSMP2
F5002
ICVE10054E250R101FR
A3
XO
A4
XI
1
IN1 OUT1
B2
CLKSEL
2
IN2 OUT2
E5 3
COL0 IN3 OUT3
F5 4
COL1 IN4 OUT4
E4
COL2 GND
F4
COL3
E3
COL4
F3
COL5
E2
COL6
F2
COL7
A5
ROW0
B6
ROW1
B5
ROW2
C6
ROW3
C5
ROW4
D6
ROW5
D5
ROW6
E6
ROW7
F5006
ICVE10054E250R101FR
9
OUT1
8
OUT2
7
OUT3
6
OUT4
GND
1
Circuit Diagram
Circuit Diagram
F5005
ICVE10054E250R101FR
1
9
IN1 OUT1
2 8
IN2 OUT2
3 7
IN3 OUT3
4
6
IN4 OUT4
GND
9
SW5001 SW5008
8
1 2 1 2
7
1 2
6
COL7
SW5002 SW5009
1 2 1 2
8 9
SW5003 SW5010
F5007
1 2 1 2
ICVE10054E250R101FR
T Y
1
9 SW5004
OUT1
IN1
SW5011
8 2
OUT2 IN2
1 2
1 2
7 3
OUT3 IN3
S D
6 4
OUT4 IN4
GND
SW5005 SW5012
1 2 1 2
L BACK
SW5006 SW5013
1 2 1 2
N M
1
IN1
SW5007 SW5014
2
IN2
1 2 1 2
3
IN3
SMILE SOCIAL
4
IN4
VOL_DOWN VOL_UP
Test point
Test point
1 /168
SW5015 SW5022 SW5029 SW5036
1 2 1 2 1 2 1 2
3 4 5 6
SW5016 SW5023 SW5030 SW5037
1 2 1 2 1 2 1 2
0 Q W E
SW5017 SW5024 SW5031 SW5038
1 2 1 2 1 2 1 2
U I O P
SW5018 SW5025 SW5032 SW5039
1 2 1 2 1 2 1 2
F G H J
SW5019 SW5026 SW5033 SW5040
1 2 1 2 1 2 1 2
Z X C V
SW5020 SW5041
SW5027
1 2 1 2 1 2
UP ENTER SHIFT
SW5028 SW5035 SW5042
SW5021
1 2 1 2 1 2 1 2
SPACE LEFT DOWN . RIGHT
SIDE_CAM
SW5050 SW5051
1 2 1 2
SPACE2 ENTER2
SW5043
1 2
BACK
7
ROW1
SW5044
1 2
HOME
R
ROW2
SW5045
1 2
SEND
A
ROW3
SW5046
1 2
K
SW5047
1 2
B
SW5048
1 2
FN
SW5049
1 2
?
SIDE_COM
1
TP1