- 85 -
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
GS290 Operational Description Revision B
LG Electronics
86/136
LGE Property
4.11 Touch trouble
Check Points
- Touch driver IC soldering`
- Touch connector Crack
U400 Solder
check
Resolder U400
Resolder or Replace
CN400
Yes
No
No
Check Touch Signal
(If not replace front touch
panel)
Yes
Yes
Replacd Main Board
U400
CN400 Solder
check
START
CN400
KQ13L-4R
CN400
4
3
2
1
VBT_2V65
TSC2007IYZGR
U400
D3
B3
D2
B2
D1
B1
C3
A3
C2
A2
C1
A1
AUX
SDA
VDD_REF
A1
X+
X-
PENIRQ-
SCL
A0
GND
Y+
Y-
VA401
EVLC14S02050
EVLC14S02050
VA408
C425
0.1u
EVLC14S02050
VA409
VA410
EVLC14S02050
C426
1u
TP419
TOUCH_INT
I2C_SDA
I2C_SCL
X+
X+
Y+
Y+
X-
X-
Y-
Y-
Touch IC
ENZY0020701
Touch Connector