Hi. I just remove the power supply board. I found out that the legend next to the connector and the underside legend are not the same. That was confusing to me. And maybe to others. The picture you show of the power board has the same problem with the wrong legend. I know why your voltages do not follow the legend next to the connector.
I am not able to get the 5volts, only 0 volts comes up. The power to the back-lights is 63volts. I will replace the power board.