F+15V, DTV9V, SUB5V SOS Detect Circuit
The F+15V, DTV9V, and SUB5V are monitored for over-voltage and over-current conditions by the SOS
circuit on the A board.
Under normal condition, pin 114 of the main CPU (IC1100) is low. When a short circuit or an over-voltage
condition occurs, the SOS detect circuit is triggered causing pin 114 to go high. When pin 114 goes high, the
TV shuts down and the power LED blinks 10 times.
When the F+STB15V line is shorted, the base of Q3503 goes low turning it on. When Q3503 is on, a high is
applied to pin 114 of IC1100 triggering the shutdown operation.
The same will happen if a short circuit develops in the DTV9V line and the SUB5V line.
The transistor Q3505 monitors the SUB5V and the DTV9V lines. If any of these supply voltages becomes
excessive, the inline zener diode (D3505 or D3506) goes into conduction and turns on transistor Q3505. As a
result, a voltage drop appears at the base of Q3503, causing it to turn on and output a high to pin 114 of the
MPU, IC1100. The MPU shuts down the unit.
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Содержание TH-37PX60U
Страница 5: ...2007 Panasonic Plasma Line up 5 ...
Страница 6: ...Models Comparison 6 ...
Страница 7: ...Models Comparison 7 ...
Страница 8: ...Models Comparison 8 ...
Страница 10: ...10 ...
Страница 11: ...10th Generation Plasma Television 11 Board Layout ...
Страница 12: ...12 ...
Страница 14: ...TH 42PX75U Board Layout Pictorial 14 ...
Страница 16: ...Overall Block Diagram 16 ...
Страница 18: ...18 ...
Страница 19: ...10th Generation Plasma Television 19 Power Supply ...
Страница 20: ...20 ...
Страница 21: ...Standby Circuit 21 ...
Страница 23: ...Standby Circuit 23 ...
Страница 28: ...Main CPU VCC Supply A Board 28 ...
Страница 30: ...TV_SUB_ON TUNER_SUB_ON 30 ...
Страница 32: ...TV_SUB_ON F_STB_ON 32 P P Board ...
Страница 34: ...TV_SUB_ON Relay Drive Circuit 34 ...
Страница 37: ...ACFB Active Clamp Full Bridge Switching Circuit 37 ...
Страница 39: ...MAIN SUB Voltages 39 ...
Страница 41: ...F 15V DTV9V SUB5V SOS Detect Circuit 41 ...
Страница 43: ...Power On Operation 43 ...
Страница 45: ...Power On 1 45 L H ...
Страница 48: ...48 Power On 3 ...
Страница 51: ...P15V P5V Circuit 51 ...
Страница 53: ...Vsus Vda Circuit 53 ...
Страница 57: ...10th Generation Plasma Television 57 Shutdown Circuits ...
Страница 58: ...58 ...
Страница 59: ...SOS Circuit Overview 59 ...
Страница 63: ...DRV_RST SOS 63 ...
Страница 65: ...Location of Q9302 65 ...
Страница 66: ...Close up View of Q9302 66 ...
Страница 67: ...5 Blinks SOS 1 67 ...
Страница 69: ...SOS Drive reset 69 ...
Страница 71: ...12 Blinks SOS 71 ...
Страница 73: ...10th Generation Plasma Television 73 Signal Processing ...
Страница 74: ...74 ...
Страница 75: ...Signal Circuit Overview 75 ...
Страница 77: ...Video Process Block Diagram 77 77 ...
Страница 79: ...D Board Block Diagram 79 ...
Страница 83: ...Audio Process Block Diagram 83 83 ...
Страница 85: ...85 ...
Страница 86: ...10th Generation Plasma Television 86 Adjustments ...
Страница 87: ...87 ...
Страница 90: ...Self Check Menu 90 ...
Страница 91: ...Check point 91 ...
Страница 94: ...Adjustment Sub Menu 94 ...