LG 42PW350 - FRONT IR, POWER LED and SOFT TOUCH KEY PAD SECTION

FRONT IR, POWER LED and SOFT TOUCH KEY PAD SECTION
The following section gives detailed information about the Front IR and Soft Touch
Key Pad. These boards contains the Infrared Receiver, Intelligent Sensor and Power
Key
Pad.
These
boards
contains
the
Infrared
Receiver,
Intelligent
Sensor
and
Power
LEDs section.
The Soft Touch Function Keys is actually a thin pad adhered to the front protective
shield and actually underneath (as viewed from the rear) the Front IR Board.
shield
and
actually
underneath
(as
viewed
from
the
rear)
the
Front
IR
Board.
The Power LED is driven by LED_RED pin from the Micro IC101. Sent to the base of
Q901 and then to P902 pin 4. Then sent to the Ft. IR board connector pin 5 P100.
This board has
no
adjustments other than the Soft Touch Key board sensitivity from
This
board
has
no
adjustments
other
than
the
Soft
Touch
Key
board
sensitivity
from
the Customer’s Menu.
The Front Control Board (IR and Intelligent Sensor) receives its operational B+ from
t
h
e
M
a
in B
oa
r
d
.
3
.
3
V
S
T P1
00
p
in 1
0
fr
o
m
t
h
e
M
a
in B
oa
r
d
. Thi
s
v
o
l
tage
i
s
ge
n
e
r
ated
te a
oa d 3 3
_
S 00 p 0 o t e a oa d s o tage s ge e ated
on the Main Board by the 3.3V_ST Regulator (IC500)
The Intelligent Sensor IC communicate with the Main Board Microprocessor
(IC101) via Clock and Data lines out P100 to P902 pins 7 and 8.
The IR signal is routed back to the Main Board via pin 1.
Also, the Soft Touch Key Pad is routed through out P100 to P902 pins 3 and 4.
June 2011 42PW350 Plasma
15 5