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Panasonic Generation Plasma Display Television Technical Manual Page 60

Panasonic generation plasma display television technical guide.
SOS Circuit Overview
Protection circuits are incorporated in the unit to prevent the failure of a single circuit or component
from creating catastrophic damage.
1 Blink SOS: This shutdown operation is usually caused by a lack of communication between the A
and the D boards.
1 Blink SOS: This shutdown operation may be caused by the improper connection of a SS board
connector to the panel.
2 Blinks SOS: Pin 87 of the MPU IC9003 monitors the 15V line. During normal operation, the
transistors Q9053 and Q9054 output a high to pin 87. If the 15V line is missing or shorted, a low is
provided to pin 87. As a result, the unit shuts down and the power LED blinks 2 times.
3 Blinks SOS: IC9807 is a 3.3V regulator located on the D board. Its output is monitored by IC9003.
If the 3.3V is not present at pin 86, the MPU shuts down the unit. The power LED blinks 3 times.
5 Blinks SOS: Pin 85 of the MPU IC9003 monitors the 5V line. During normal operation, the
transistors Q9051 and Q9052 output a high to pin 85. If the 5V line is missing or shorted, a low is
provided to pin 85. As a result, the unit shuts down and the power LED blinks 5 times.
6 Blinks SOS: Pin 90 of the MPU IC9003 monitors the status of the SC board. During normal
operation, the transistor Q6581 and IC6581 output a low to pin 90. If the SC board becomes
defective, a high is provided to pin 90. As a result, the unit shuts down and the power LED blinks 6
times.=
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