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Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
Main key PCB
Main board
TP08_BB
CN1
TP05_BB
Side key
TP06_BB
RA101
TP07_BB
VA101
~ VA108
TP08_BB
CN603
①
②
③
④
④
VDDG_2V85 : N.C (REV.B)
1800
R104
R103
1800
VB
A
T
17
18
19
2
20
3
4
5
6
7
8
9
G1
G2
G3
G4
CN1
1
10
11
12
13
14
15
16
VDDE_1V8
MIC1N
CCO1
KEYIN3
KEYIN2
KEYIN1
KEYIN0
MIC1P
KEYOUT4
KEYOUT3
ACC_GP15_FLIPSENSE
KEY_LED1
KEY_LED2
KEYOUT1
KEYOUT2
3
5
7
1
4
8
HOT4
6
9
NUMBER_KEY
0
HOT5
2
109
108
2
4
6
8
1
3
5
7
RA101
10K
103
102
101
105
107
HOT102
104
VDDE_1V8
106
HOT101
110
KEYIN2
KEYIN0
KEYIN1
KEYOUT1
KEYOUT3
KEYOUT2
KEYOUT4
KEYIN3
REV
.C
REV
.C
REV
.C
EVLC14S02050
VA
1
0
4
V
A
106
EVLC14S02050
V
A
103
EVLC14S02050
INSTP
A
R
ZD105
ESD9X5.0ST5G
ESD9X5.0ST5G
INSTP
A
R
ZD104
ESD9X5.0ST5G
INSTP
A
R
ZD103
V
A
102
EVLC14S02050
V
A
108
EVLC14S02050
KEYIN3
KEYOUT3
KEYOUT2
KEYIN2
KEYIN1
KEYIN0
KEYOUT1
KEYOUT4
20 pin CONNECTOR_Female
VBAT
5
6
7
8
9
G1
G2
G3
G4
1
10
11
12
13
14
15
16
17
18
19
2
20
3
4
CN603
VDDE_1V8
KEY_LED2
KEYOUT1
KEYOUT3
ACC_GP_FLIPSENSE
KEYOUT2
KEYIN3
KEYIN2
KEYIN1
KEYIN0
KEYOUT4
CCO1
MIC1N
MIC1P
KEY_LED1
Main board