Tynetec Advent xt - Main CCU Board Power and LED Status

NO Disconnect ‘Power Out’, ‘Power in’ & ‘Battery’ leads from XT A00380 Main CCU Board
& test to see if 27.5v DC present at Output of SMPSU Module?
If not, then possible faulty SMPSU
 Is 27.5v DC present at ‘Power In’ connection?
YES continue