LG GS290 - Touch Trouble

- 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
T
ouch Signal
(If not replace front touch
p
anel
)
Yes
Yes
Replacd Main Board
U400
CN400 Solder
check
STAR
T
CN400
KQ13L-4R
CN400
4
3
2
1
VBT_2V65
TSC2007IYZGR
U400
D3B3
D2B2
D1B1
C3A3
C2A2
C1A1
AUX SDA
VDD_REF A1
X+ X-
PENIRQ- SCL
A0 GND
Y+ Y-
VA401
EVLC14S02050
EVLC14S02050
VA408
C425
0.1u
EVLC14S02050
VA409VA410
EVLC14S02050
C426
1u
TP419
TOUCH_INT
I2C_SDA
I2C_SCL
X+
X+
Y+
Y+
X-
X-
Y-
Y-
Touch IC
ENZY0020701
Touch Connector