LG -T300 Service Manual page 107

4. TROUBLE SHOOTING
CIRCUIT
X+
1
2
X-
3
TP05
4
TP05
TP06
CN301
C340 C341
TP04
X+
Y+
X-
Y-
C314
0.1u
LGE Internal Use Only
Touch & Haptic Driver Ckts
Y+
TP06
TP07 TP08
Y-
TP07
TP08
C342
C343
X+
Y+
X-
Y-
VBAT
C314
TP03
0.1u TP02
C313
2.2u
U301
4
VDD VDDP
SDA
18
XP SCL
1
YP SADD
2
XN LEN
3
YN INTB
PWM/CLK
HEN
19
PGND VDP
VDN
GAIN
R10
ACD
P11
AGND
T10
VREF
A16
VSSRF2
T16
NC2
A1
VSSCORE4
T1
NC4
F9
VDDFS
TP1
VBAT 1V8_VDD
TP01
PWRON
C313
2.2u
U301
4 9
VDD VDDP
7
SDA
18 8
XP SCL
1 6
YP SADD
2 17
XN LEN
3 5
YN INTB
10
PWM/CLK
16
HEN
1V8_VDD 19 14 1V8_VDD
PGND VDP
12
VDN
13
GAIN
TP01
C315
2.2u
9
7
8
6
17
5
TP306
10
TP307
16
14
12
13
R310 DNI
C310 10n
R332
100K
- 108 -
Copyright © 2010 LG Electronics. Inc. All right reserved.
C109
220n
TP106
TP
1V8_VDD
TP02
1V8_VDD
R311
DNI
C315
2.2u
R312
4.7K
TP04 TP0
I2C_SDA
I2C_SCL
TOUCH_EN
TP306
TOUCH_INT
TP307
VIB_PWM
VIB_EN
R310 DNI
R311
C310 10n
DNI
R332 R333
100K 100K
R312
4.7K
I2C_SDA
I2C_SCL
TOUCH_EN
TOUCH_INT
VIB_PWM
VB301
VIB_EN
1
2
C339
1u
R333
100K
Only for training and service purposes
I2C_SDA
I2C_SCL
VB301
1
2
C339
1u