Touch Trouble - LG GX500 Service Manual

4. TROUBLE SHOOTING
GX500 Operational Description

4.10 Touch trouble

Check Points
- Touch driver IC soldering`
- FPCB_Folder Crack
Figure 4-26. Touch driver IC Circuit
Checking Flow
START
Pin1 of Touch driver IC(U802)
is high(2.9v)?
Yes
Pin6 of U802 is
high?
Yes
FPCB_Key is
Crack?
Yes
Replace FPCB_Folder and
Assemble
LGE Internal Use Only
LG Electronics
TOUCH IC
2V7_VTOUCH
2V62_VIO
C819
C820
0.1UF
10U
U802
A1
AUX
A2
VDD_REF
A3
TS_XP
X+
B1
TS_IRQ
PENIRQ-
B2
TP802
A0
B3
TS_YP
Y+
C821 C822
DNI DNI
Check Fpcb_Key and
No
replace
No
Resolder U802
No Check and Replace
Fpcb_Key
- 92 -
92/143
2V62_VIO
TSC2007IYZGR
C1
I2C2_SDA
SDA
C2
A1
C3
TS_XM
X-
D1
I2C2_SCL
SCL
D2
GND
D3
TS_YM
Y-
C823 C824
DNI DNI
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