Front (Ir, Intelligent Sensor And Moving Led) Section - LG 42LH90 Manual

FRONT (IR, INTELLIGENT SENSOR and MOVING LED) SECTION

FRONT (IR, INTELLIGENT SENSOR and MOVING LED) SECTION
The Intelligent Sensor and IR board (located on the bottom left as viewed from the rear) contains the
IR (Infrared Remote Sensor) and the Intelligent Sensor. This board also connects with the Side Key
Board and the Moving LED board which contains the 10 front Power LEDs.
The IR board receives it operating B+ via P101 pin 6 (STBY 5V) and pin 11 (3.3V) from connector
P1200 on the Main board.
The Intelligent Sensor communicates with the Micro/Video Processor IC100 Mstar Chip via clock and
data lines SCL1 and SDA1 (AA17 and AA18) arriving on connector P101 from P700 pins 1 and 2 on
the Main board.
The Front Power LEDs are controlled by these same Clock and Data lines which communicate with
the LED Driver IC U1 on the Moving LED board.
The IR pulses (5V p/p) P101 pin 9 are sent to P1200 on the Main board and on to the Microprocessor
(IC100) via pin C4.
The Key board is routed to the IR board via P100 to P102 on the Key 1 and Key 2 lines, (Key 1 pin 1
and Key 2 pin 3). Then out P101 pins 4 and 5 to P1200 on the Main Board.
Then to the Microprocessor A4 and B4 lines.
82 February 2010 LCD DV 42LH90