July 2009 LCD DV
42LH40
55
FRONT CONTROL (IR and INTELLIGENT SENSOR) SECTION
FRONT CONTROL (IR and INTELLIGENT SENSOR) SECTION
The Front Control PWB (located on the bottom left as viewed from the rear) contains the IR (Infrared
Remote Sensor) and the Intelligent Sensor plus the front Power LEDs.
This board also connects with the Side Key PWB.
This board receives it operating B+ via pin 6 (STBY 5V) and pin 11 (STBY 3.3V) on connector P1.
It is received from the Main PWB via the connector P1200.
The Intelligent Sensor communicates with the Video Processor IC100 via clock and data lines on the
same connector pins 1 and 2.
The IR pulses (5V p/p) are sent to the Microprocessor (same IC100) via pin 9.
The Key board connector P3000 is routed to the Ft control board via P2. Then through the front
Control board and out P2 to the Microprocessor via P1200 pins 4 and 5.
Finally, the front Power LEDs are controlled by pin 12 and pin 8.
