P Board Sos Detection - Panasonic TH-37PX50U Technical Manual

P Board SOS Detection

Figure 43
This drawing is used to verify an SOS condition that may have originated from the P
Board. The connector information should be used for troubleshooting purposes. The
switched voltages of connector P23 and P5 are monitored on the SC and PB boards.
The remaining voltages are monitored for abnormalities directly on the P board. Instead
of using a peak hold voltmeter, the power supply connector of the suspected board
causing the blinks of the power LED may be disconnected to see if the unit remains on
after power up. If it does, this usually indicates that the problem is located in the
disconnected board. If the power LED continues to generate the same amount of blinks,
more troubleshooting is required.
Note: The unit will become totally inoperative if the connector P10 is disconnected. The
system control circuit will be unable to power the unit. The power LED will blink ten
times immediately after connecting the unit to the wall outlet.
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