You should start for the Vs & Va voltages itself. The details to these voltages will be marked on the panel label itself. These two voltages should be more specific than other voltages, especially to Plasma displays. More variations; say; + or - 1%, can effect the display drastically. To get more details about this, you have to download the repair manual to this set, and refer its schematic diagram. If you wish to get some details, check the site linked here.
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