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Panasonic TH-65PX600U Service Manual page 44

Panasonic 9th gen. plasma display television
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PA-Board_Loss of Sub-Voltage Protection
The transistor Q5641 monitors the FSTB14V, SUB3.3V, SUB9V, and SUB5V lines.
If any of these supply lines develop a short circuit, transistor Q5641 goes into
conduction and applies a high to pin 209 of the MPU, IC1103, triggering an SOS
condition.
44

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