Panasonic TH-65PX600U Service Manual page 69

50PX60 Sustain Operation
After the video signal is processed on the D board, the sustain and erase
pulses are output to the SS board. The erase pulse is output at the
beginning of each scan period. The pulse is applied to the SS2 and SS3
boards to remove the previous charge from the the display panel.
The sustain pulses are also developed on the D board and are applied after
the address periods.
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