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The Vs (160-180V depending on the actual panel/set) supplies from the PSU are normally connected by pretty heavy cables and plugs to each of the SUS boards.
Remove one at a time and re-test if the set will stay on.
This will at least tell you which board is faulty. Not sure on that actual model, but there's modules/hybrids with large heatsinks on, used in those SUS boards.
--These are 'IPM's' have MOSFETS inside that go short.
There's in fact, Loads of MOSFETS generally in both the YSUS and ZSUS boards, some of which will kill down the PSU, others just seriously upset the picture--or remove it completely!
The IPM faults sometimes blow the SUS board fuse--sometimes not, but will kill the picture/illumination of screen completely in most cases...
Generally speaking, there's very little info or schematics for the 'panel' side of things around for plasma--They expect you to replace the entire board if it faults....
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