LG 50PJ340 Training Manual - Page 121

Front Ir, Power Led And Soft Touch Key Pad

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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 LEDs section. The Soft Touch Function Keys is actually a thin pad adhered to the front protective shield. The Power LED Driver and Intelligent Sensor IC communicate with the Main Board Microprocessor (IC1) via Clock and Data lines. These boards have no adjustments. The Front Control Board (IR and Intelligent Sensor) receives its operational B+ from the Main Board: • 3.3V_ST from the Main Board. This voltage is generated on the Main Board (IC302) • 3.3V_MST generated on the Main Board (IC303). The Front Power LEDs are driven by 2 separate pins from the Main board SCL/SDA 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 the Front IR board and out P100 to P704 pins 3 and 4. 121 July 2010 50PJ350 Plasma

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121
July 2010
50PJ350
Plasma
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
LEDs section. The Soft Touch Function Keys is actually a thin pad adhered to the
front protective shield.
The Power LED Driver and Intelligent Sensor IC communicate with the Main Board
Microprocessor (IC1) via Clock and Data lines.
These boards have no adjustments.
The Front Control Board (IR and Intelligent Sensor) receives its operational B+ from
the Main Board:
•
3.3V_ST from the Main Board. This voltage is generated on the Main
Board (IC302)
•
3.3V_MST generated on the Main Board (IC303).
The Front Power LEDs are driven by 2 separate pins from the Main board SCL/SDA
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 the Front IR board and out P100 to
P704 pins 3 and 4.