LG 50PK950 Training Manual page 156

SOFT TOUCH KEY PAD SECTION (Board Layout and Identification)
SOFT TOUCH KEY PAD SECTION (Board Layout and Identification)
The Soft Touch Key Pad is a thin "Static" sensitive pad that is adhered to the front protective shield.
The Soft Touch Key Pad requires a static sensitive key press decoder IC to change the key press
data into R2 Ladder (Resistive data) which the Microprocessor can understand. This IC is on the
Front IR board IC100 which receives key press data from P101. The output from this IC simply
selects the appropriate resistor to inject into the Key 1 or Key 2 line which is then interpreted by the
Microprocessor in the Main board IC701.
IC100
P101
static sensitive
Front the static
key press
sensitive key pad
decoder
Button Identification for the Front the static sensitive key pad
156 October 2010 50PK950 Plasma