Both boards have ONE light on them, whether they are green or red...No light means DEAD.
Vs Va and Ve are universal voltages coming off the power supply board to DRIVE the SC board and the SS...without them, No picture or BAD picture.
Usually in MOST if not ALL plasmas -- I have seen Vs AND Va clearly marked on the cable that connects the power supply to the SC board. Easy to read those....
Ve is a little tricky, because SOMETIMES it's labled Vd or even Vsc, it depends on what brand I'm working on.
But...ALL TV sets that are plasma have a sticker on the Plasma Panel -- Rectangular in size and with ALL the critical voltages listed on it.
So you'll always see Va and Vs listed on it -- and if there is no Ve listed, THEN you look for either Vd or Vsc listed on it. Usually it's about 90 volts for Ve.
Now, if you do need MORE info on the Ve voltage, where to find it, I'll help you with that.
But I'm going to leave you with this basic information for one basic reason.
If I teach you the basics that I was taught - then you'll have the most critical information at your fingertips to troubleshoot.
So, if the SC light isn't lit -- Bad SC board.
If you are missing either Vs or Va or Ve....or they are LOW -- bad power supply board.
The sticker on the Plasma Panel lists ALL of them -- one stop for ALL critical voltages.