LG KE990 Service Manual - Page 125
Touch Screen trouble
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4. TROUBLE SHOOTING 4.15 Touch Screen trouble Touch Initial sequence of KE990 is : LCD_VDD_2.8V(C701) goes to 2.8V → TOUCH_PENIRQ_N(R702),TOUCH_I2C_SCL(R703) & TOUCH_I2C_SDA(R704) go to high Touch operation of KE990 is : A finger is touching on the screen → TOUCH_PENIRQ_N is low → I2C is connected → A finger is took off from the Screen → TOUCH_PENIRQ_N is high → I2C is not connected. Start Touchpad Cal ibr ation Yes Work well? No NO Conne ctor Is in sert? YES Replace t he Folder End Inser t Connector, again Yes Work well? End No Replace t he Main board C701 (LCD_VDD_2.8V) U700 Touch Window Con nector R702 (TOUCH_PENIRQ_N) R704(TOUCH_I2C_SDA) R703 (TOUCH_I2C_SCL) LGE Internal Use Only - 126 - Touch F PCB Connector Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes