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Panasonic gp8du gph8du th-37px50u th-42pd50u th-42px50u th-42px500u th-50px50u th-50px500u troubleshooting Service Manual

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How to determine whether the D board or SC board is defective? 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Figure 58 
 
 
Note: All SCAN CONTROL PULSES are located at pins 2, 3, 4, 6, 7, 8, 9, 13, 17, 18, 
19, and 20 of connector SC20-D20. A missing waveform at one of the pins with the 
exception of pins 8, 9, and 13 will cause the power LED to blink.
 
 
 
 
 
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