TH-42PX25U-P Power-On with Switch on Front Panel
Refer to figure 25. When the unit is connected to the AC, the “Standby” powers-up the
microprocessor IC001. As soon as the “Reset” operation of IC001 is complete, its pin
48 goes “High”. The “High” from pin 48 is routed through pins 36 of connector DG2/PA2
and pin 9 of connector PA10/PF10 to the base of the transistor Q909 on the PF-board,
turning it on. This turns on the relay RL901.
Via the relay, AC is applied to the bridge rectifier D920. The DC control circuit (IC 920
and T920) regulates the resulting DC and provides two voltage sources, one is 10V and
the other is 24V. Both sources are routed to the PA-Board. The 10V source is routed
via pins 1 and 2 of the connector PF10/PA10, and the 24V is routed via pin 5 of the
same connector.
Using DC-DC converters, many secondary DC sources are derived from the 10V and
24V sources, on the PA-Board. These secondary sources Main 9V, Main 2.5V, Main
5V, Sub 5V, BT 30V, and VD1 (5V) are all commanded by one on/off line. A “High”
from pin 53 of IC001 turns on all the secondary sources when the TV is turned on by
either the on/off switch on the set or remote control.
Power Detect is accomplished by applying the Main 5V via pins 11 and 13 of
connectorPA2/DG2 to Q030, which applies a “Low “ to pin 52 of IC001.
The on/off switch on the front panel is a momentary switch, located on the K-Board, that
grounds pin 67 of IC001 when pressed.
In addition, the “High” from pin 53 is used to communicate “Power Status” to the
microprocessor IC9709 on the D-Board via pin 5 of connector DG3 and pin 15 of
connector D3.
The microprocessor (IC9709) on the D-board sends a “High” on its pin 45 to pin 18 of
the power control IC, IC501 on the P-Board (power supply board). Accordingly, the
power supply board turns-on and provides the necessary TV run voltages as Vsus, Vda,
the 15V, the 12V, and the 5V.
TH-42PX25U-P Power-On with Remote Control
The sensor receiver on the K-board receives the infrared signal from the remote control.
The signal is amplified and routed through the C2-board. Then it is applied to pin 40 of
the microprocessor (IC9709). The remote control signal is also applied to pin 72 of
IC001 via IC9709, pin 25 of connector D3, and pin 15 of connector DG3. The
microprocessor IC001 sends a “High” on pin 53, repeating the process mentioned
above.
38
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Страница 23: ...Figure 9 H Board Block Diagram 17 ...
Страница 24: ...Figure 10 DG Board Block Diagram 18 ...
Страница 37: ...Figure 23 TH 42PD25U Power on operation 31 ...
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Страница 43: ...DG6 DG3 Figure 24 TH 42PX25U Power on operation 37 ...
Страница 45: ...Figure 25 TH 42PX25U P Power on operation 39 ...
Страница 49: ...4 1 Figure 26 TH 65XVS30 Power On operation 43 ...
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Страница 55: ...49 Figure 28 TH 42PD25U PA board SOS detect ...
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Страница 59: ...Figure 31 SS board SOS Detect 53 ...
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Страница 87: ...IC9709 Figure 36 TH 42PX25U 3 3V_SOS_5V_SOS detect 81 ...
Страница 89: ...Figure 38 SS SOS Detect 83 ...
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Страница 94: ...Figure 40 3 3V SOS and 5V SOS Detect Circuit TH 42XVS30 88 ...
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Страница 101: ...Figure 44 Power SOS and Fan SOS Detect Circuit TH 42XVS30 95 ...
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