LG KE800 Service Manual page 55

4. Trouble Shooting
TOUCH_EN
TOUCHPAD DRIVER LDO
VBAT
C754
C753
1u
22u
3V3_VTOUCH
U706
BH33FB1WHFV FB704
1 5
STBY NC
2 6
GND BGND
3 4
VIN VOUT
C756
4.7u
Check 3V3_VTOUCH Voltage. It should be
3.3V
When TOUCH_EN = High.
Check "TOUCH_EN" Signal. It should be High
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C755
22u