How To Determine Whether The D Board Or Ss Board Is Defective - Panasonic TH-37PX50U Technical Manual

How to determine whether the D board or SS board is defective?

Figure 61
Note:
All SUSTAIN CONTROL PULSES are located at pins 3, 4, 5, 6, 7, and 8 of one
of the C (see the table above) and SS44 connectors. A missing waveform at one of the
pins with the exception of pin 4 will cause the power LED to blink.
78