Front (Ir, Intelligent Sensor And Moving Led) Section - LG 47LX9500 Service 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 Soft Touch
Key Board and the Center LG Logo board. The Center LG Logo lights after power on and the picture
appears. Then dims down in about 2 seconds. At power off, it does the reverse.
The IR board receives it operating B+ via J1 pin 6 (STBY 3.5V).
The IR (Infrared) remote receiver can be measured (1.57V) at pin 9 of connector J1 or P8200 on the
Main board in Stand-By. During run pin 9 reads (1.54V).
The IR pulses (1.6V p/p) J1 pin 9 are sent to P8200 on the Main board and on to the Microprocessor
(IC8101) via pin 16.
The Intelligent Sensor communicates with the Micro/Video Processor IC900 BCM Chip via clock and
data lines SCL1 and SDA1 arriving on connector J1 from P8200 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 on the IR board.
The Key board is routed to the IR board via CON2 and output on J1 Key 1 and Key 2 lines, (Key 1 pin
4 and Key 2 pin 5). Arriving at P8200 pins 4 and 5 on the Main Board.
Then to the Microprocessor 25 and 26 lines.
NEW: This TV also has a Motion Remote which allows the customer to manipulate a pointer by
pointing the Motion Remote at the screen. The Sensor for the Motion Remote is on the Front IR
board.
September LCD TV 47LX9500
110