The STBY5V from the power supply board is applied to pin 4 of the regulator, IC9011. During Standby
operation, the regulator does not operate due pin 6 being low.
Upon receiving the power on command , the “PANEL STB ON” high from pin 20 of connector D5 is applied
to the base of Q9044 on the D board, turning it on. Q9044 outputs a low to turn off Q9046. When pin 6 goes
high, IC9011 outputs the reset command at pin 1 and the STB3.3V at pin 3.
The STB3.3V is applied to the VCC pins of the CPU IC9003 (pins 24, 39, 61, 63, 68, and 88). The CPU
then outputs a high (3.2V) at pin 100. The 3.2V is directed to the power supply via pin 11 of connector
D25/P25.
49
Power On (3)
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