LG KF690 Service Manual page 78

SPM0204LE5-QB
G4
6
PWR
5
G3
4
G2
3
G1
2
OUT
1
MIC100
T15
MICBIAS
AA18
AUXOUT
AA19
HPH_VREF
AC22
LINE_L_IP
AC21 1u C215
LINE_L_IN
AC19
LINE_R_IP
1u C216
AC20
LINE_R_IN
AF19
AUXIN
AE19
AUXIP
0.1u C211
AF21
MIC2N
0.1u
C212
AF22
MIC2P
AF20
MIC1N
AE20
MIC1P
AA20
CCOMP
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
MICBIAS
C103 C104
10u 47p
C105 0.1u
MIC1N
C106 0.1u
MIC1P
1u C205
1u C206
C204 10p
MIC1N
MIC1P
- 79 -
4. TROUBLE SHOOTING
+VPWR
CN100
G1
1
2
FOLDER_DETECT_N
3
KEY_ROW(3)
4
KEY_ROW(2)
5
KEY_ROW(1)
6
KEY_ROW(0)
7
KEY_COL(4)
8
MIC1P
9
MIC1N
10
MICBIAS
G2
KEY PCB TO MAIN PCB
+VPWR
CN302
G1 G2
1 20
2 19
FOLDER_DETECT_N
3 18
KEY_ROW(3)
4 17
KEY_ROW(2)
5 16
KEY_ROW(1)
6 15
KEY_ROW(0)
7 14
KEY_COL(4)
8 13
MIC1P
9 12
MIC1N
10 11
MICBIAS
G3 G4
MAIN PCB TO KEY PCB
VREG_MSMP_2.7V
20
19
18
KEY_COL(0)
17
KEY_COL(1)
16
KEY_COL(2)
15
KEY_COL(3)
14
KYPD_LED_EN
13
PM_ON_SW_N
12
UART_RX
11
UART_TX
VREG_MSMP_2.7V
KEY_COL(0)
KEY_COL(1)
KEY_COL(2)
KEY_COL(3)
KYPD_LED_EN
PM_ON_SW_N
UART_RX
UART_TX
LGE Internal Use Only