Looking for advice on the repairing of a hitachi commercial plasma monitor cmd 4201 currently cycling off after power up.Shot gun repair effort so far ,just replacing suspect board x and y substain s. Power supply board .I have repaired it several times before luckily. Want to do a more complete evaluation of my problem. The power supply I assume is cycling because of I believe that the Y substain is bad. Can I test the power supply board to rule out,problems on it. Should the power supply supply vs va for the substain boards with them unplugged,. Will I get the voltages before it cycles off or...

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my name is joe learned my tech in system USAF flight simulator c 141 visual with further work with firearm simulators video conferencing systems and now POS and R/R
contract work. tv repair as a hobby. how to find good advice here' i appreciate the opportunity thanks joe my current nightmare is a CMD 4203 hitachi plasma montor