You really want to get a schematic/service manual, which seems to be available from a few places online.
Yes, I
really wanted to get one except for the minor point;
there aren't any!
I have searched three times and the best I managed to find is a training guide for their top end set (in that series) that has the same panel, but a different chassis. It's a help, but there are no schematics for either the PS, or the Y or Z boards which comprise 90% of the circuity of the set. I might add I have three similar service manuals and all they have are schematics of the "Control" board and the "Main" board.
I wanted to avoid removing that board since that is the main TV and I don't know the discharge time for all of those caps.
It could be worse, it could be a Vizio and I would have neither. There are no service manuals (let along schematics) available for
any of their models in the past 3 or so years, just the older sets.
Here is the board;