Th-42Xvs30 Power Sos Detect; Th-42Xvs30 Fan Sos Detect - Panasonic GP6DU Technical Manual

TH-42XVS30 Power SOS Detect

Pin 94 of the Microprocessor IC9003, monitors the Vsus, the DC12Vand the 5V
lines. A short circuit on any of these lines is detected by the transistors Q509,
Q424, Q508, or Q511.
If there is a short circuit on the DC12V line or the 5V line, Q508 turns on
grounding pin 20 of IC501, making pin 15 go high.
When pin 15 goes high, it turns off Q544 and a low condition is applied to pin 94
of the Microprocessor IC9003 on the D board
If there is a short or excessive load on the Vsus line, Q511 turns on, grounding
pin 17 of IC501, thus making pin 15 go high.
When pin 15 goes high, it turns off Q544 and a low condition is applied to pin 94
of the Microprocessor IC9003 on the D board.

TH-42XVS30 Fan SOS Detect

The two ventilation fans are monitored to be sure that they are operating
properly. If one of the fans opens or increases resistance, the resulting current
change is applied to pin 89 of the Microprocessor IC9003.
93