User manual

Power-on Operation (TH-65XVS30U)
Refer to figure 26. On the Onyx line of Plasma TV, power can be turned on whether the
tuner box is connected or not. This is done to isolate defects when troubleshooting this
TV.
The power switch is of the latch type, and is located on the side of the TV.
When the power switch is pressed, the TV comes on and it displays “NO SIGNAL” on
the upper right hand corner of the screen. Also, the power LED turns blue.
If the power is turned off using the remote control, the unit goes off and the power LED
turns red. If the power is turned off using the power button on the TV, the LED goes off.
Note: If the TV is connected to a receiver and the signal cable (with a DVI-like
connector) is left disconnected, the TV turns on with no OSD and then shuts off, a few
seconds later.
Power-On with Switch on Front Panel
The following circuit operation discussion applies to the plasma monitor only, with the
tuner (receiver box) disconnected.
Refer to figure 26. The AC from connector P9 is applied to a bridge rectifier (D404). The
DC voltage from D404 is then applied to the stand-by circuit (IC409, IC408, IC504, and
T410).
This circuit supplies 12V and 5V(7V on schematic). The diode D511 rectifies the 12V,
and D510 rectifies the 5V(7V on schematic).
The 5V is connected to a 5V regulator (IC700) on the Power Control board (PC) via pin
12 of the connector P700/PC700. The regulated 5V serves as the VCC source for IC
701 on the PC-Board.
The 12V is routed through the sustain (SS) board to the power on/off switch on the S1-
board. When power is turned on, the 12V is applied to one side of the coil of the power
relay RL403 and to the gate of Q538. The 12V is also used to turn on the switching
transistor Q712 on the PC-Board applying a “Low” to the Standby Power-Detect pin 7 of
the microprocessor IC701.
When pin 7 of IC701 goes “Low”, pin 16 goes “Low”, turning Q708 off. The “High” on
collector of Q708 is applied to the gate of Q537 via pin 11 of the connector
P700/PC700. Q537 turns on and since the gate of Q538 is already at a “High”, the two
transistors conduct the Standby 5V to pin 4 of the connector P27/D27. On the D-Board,
the Standby is regulated down to 3.3V and supplied to the VCC pin of IC9003. IC9003
send a “High” on pin 20, which is applied via pin 2 of connector D27/P27 and pin 15 of
connector P700/PC700 to pin 18 of the microprocessor IC701 on the PC-Board. In
response, pin 9 of IC701 goes “High”. This “High” turns on Q713, which applies a
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