Panasonic gp8du gph8du th-37px50u th-42pd50u th-42px50u th-42px500u th-50px50u th-50px500u troubleshooting Service Manual
Voltage Distribution of the PA board and SOS Detection
Figure 44
This diagram depicts the distribution of the PA board voltages to the DG, H, DT, DV, Z,
and K boards. A high input at pin 111 of IC4005 will cause the unit to shut down and
generate ten blinks of the power LED. This SOS condition is created when there is an
abnormality of any of the voltages shown in the diagram.
Instead of using a peak hold voltmeter, the power supply connector of the 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.
and K boards. A high input at pin 111 of IC4005 will cause the unit to shut down and
generate ten blinks of the power LED. This SOS condition is created when there is an
abnormality of any of the voltages shown in the diagram.
Instead of using a peak hold voltmeter, the power supply connector of the 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.
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