LG CT815 Service Manual page 50

3.12.4 Touch Interface
In CT815, 4-wire touch screen panel is used for user input method. Two resistive layers make up a 4-
wire touch screen panel and are separated by insulating dots. The inside surface of each layer is
coated with a transparent metal oxide coating that generates a gradient across each layer when
voltage is applied.
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Only for training and service purposes
Table. MSM7200 Touch screen connections
Table. Recommeded operation conditions
TOUCH SCREEN CONNECTOR
CN501
1
2
3
4
Figure. Touch screen circuit
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3. TECHNICAL BRIEF
R527 100ohm
TOUCH_X1XR
R528 100ohm
TOUCH_Y2YU
R529 100ohm
TOUCH_X2XL
R530 100ohm
TOUCH_Y1YD
LGE Internal Use Only