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your symptom is known as Maldischarge. its caused by drifting sustain voltages.
The main power supply creates two main voltages, Vs, and Va. VS is the sustain voltage, and Va is the addressing/buffer voltage.
However, the Y sustain board has a plethora of DC-DC converters that generate various other voltages for each state during the charge/discharge cycle. like -Vy, Vsc, etc...
These can drift around or have ripple from drying out/bad caps and do this.
Hell, I have seen some plasma TVs (I own one) that the DC-DC converters have gotten so bad, that they cycle. tick tick tick causing the picture to pulsate bright/dim/bright/dim where the picture goes into full brightness/perfect, and quickly fades to a screen full of maldischarge to almost an inverted image, and cycles back again. Like a strobe light. All from bad caps.
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