In post #12, careful high voltage, if it's around 400 v, powered on then your ffc is working correctly, about 160 when tv not powered on, measured in vdc mode, one probe on each leg of cap.
Thinking you should have the same boosted voltage when powered on, should find it on one of the transformer legs if they are exposed to get at from the top.
If you can get at the transformer leg and it's on the primary/hot side, you can use the negative leg of the bridge rectifier for ground becuz you are in the hot side.
Maybe try if you didn't already, leave everything else hooked up as would be normally, unhook the inverter from powerboard, turn tv on and recheck voltages on all connector pins on the powerboard like you did before, check them all.
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