LG 50PJ340 Training Manual - Page 125

SOFT TOUCH KEY PAD Board Layout and Identification

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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 IC1. IC100 P101 static sensitive key press decoder Front the static sensitive key pad c Button Identification for the Front the static sensitive key pad 125 July 2010 50PJ350 Plasma

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125
July 2010
50PJ350
Plasma
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 IC1.
IC100
P101
static sensitive
key press
decoder
Front the static
sensitive key pad
Button Identification for the Front the static sensitive key pad