NEC LCD1550X Service Manual page 44

• Power management control (FET-SW and regulator ON/OFF control, etc.)
(1) At AC power ON
System reset
Microcomputer initialization
P_ON = ON
P_SUS* = ON
ASIC initialization
ASIC power save mode transfer
(2) Front power switch = ON & power save recovery
P_SAVE = ON (resonance mode)
ASIC power save mode cancel
P_PANEL = ON(black mask)
Delay
P_TMDS = ON
Inverter ON control (P_INVT = ON, PRO_DLY output, DUTYCINV output)
Video buffer ON (SEL_1 = ON or SEL_2 = ON during analog)
(3) Front power switch = OFF
Video buffer OFF
Inverter OFF control
P_PANEL = OFF
ASIC power save mode transfer
P_SAVE = OFF(PRC mode)
P_TMDS = OFF
(4) Power save transfer
Video buffer OFF
Inverter OFF control
P_PANEL = OFF
ASIC power save mode transfer
P_SAVE = OFF(PRC mode)
P_TMDS power save mode transfer
(P_TMDS = OFF when VIDEO DETECT = NONE, and D-SUB Ch is selected)
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