Touch Screen Trouble - LG KF700 Service Manual

4. TROUBLE SHOOTING

4.11 Touch Screen trouble

Touch Initial sequence of KF700 is :
VREG_LDO_TOUCH_2.8V(C102) goes to 2.8V
TOUCH_I2C_SCL(R304) & TOUCH_I2C_SDA(R305) go to high.
Touch operation of KF700 is :
A finger is touching on the screen
took off from the Screen
LGE Internal Use Only
→
→
TOUCH_PENIRQ_N is low
→
TOUCH_PENIRQ_N is high
- 102 -
TOUCH_PENIRQ_N(C104),
→
I2C is connected
→
I2C is not connected.
Copyright © 2008 LG Electronics. Inc. All right reserved.
→
A finger is
Only for training and service purposes