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LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
TP10_BB
U503
Main Board
TP11_BB
U501
②
③
④
The output must be 3.1V DATA or Clock signal
Multikey
⑤
The output must be 3.1V DC.
U503
CE
6
GND1
2
GND2
5
4
NC
1
VDD
3
VOUT
TP505
R1114D311D
1u
C513
VBAT
C512
1u
VDD_LDO_3V1
ACC_GP_LDO_3V1_EN
TOUCHSCREEN Level Shifter
REV.F
TP501
C507
smd_0603h_3_r
0.1u
A3
A3
A4
A4
C1
B1
C2
B2
B3
C3
B4
C4
B4
GND
B3
OE
VCCA
B2
B1
VCCB
U501
TXS0104EZXUR
A1
A1
A2
A2
R501
2K
VDD_LDO_3V1
VDDE_1V8
TP503
2.2K
R502
smd_0603h_3_r
C510
0.1u
R503
2
.2K
APP_GP_TOUCH_SCREEN_INT
TOUCH_RST
IN_TOUCH_SCREEN_SDA
ACC_GP_LDO_3V1_EN
IN_TOUCH_SCREEN_SCL
TOUCH_SCREEN_INT
APP_GP_PAD_SDA
APP_GP_PAD_SCL
APP_GP_TOUCH_RESET
R906
TP12_BB
R907
②
③
④
⑤
Change Multikey PCB
TOUCH_CONNECTOR
Rev.1.0
R906
4.7K
TOUCH_3.1V
4.7K
R907
13
14
2
3
4
5
6
7
8
9
15
16
17
18
CN901
1
10
11
12
ICVN0505X150FR
VA907
TOUCH_SCREEN_INT
TOUCH_SCREEN_SCL
TOUCH_SCREEN_SDA