Panasonic television User Manual

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Power On (2)
Upon receiving the power on command , the “PANEL STB/VCC ON”  pin of the main MPU (IC1100) 
outputs 2.5V to the base of Q4015, turning it on. Q4015 outputs a low to turn off Q4014 allowing pin 20 
of the connector A5/D5 to go high. 
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