Started to measure things today, as said earlier board has no any indications except blown fuse that something ain't working.
I measured today secondary side voltage lines and didn't indicate short that could cause primary side fuse to blow. Also tested connecting the main board power connector to unit and see did values change but no problems with that either, so it definitely is PSU which is broken.
So the fault has to be transformer or primary side components. I measured all power resistors, they seem to be fine, measured C1 and C2 1200µF caps with LCR meter and got 1080µF with 120Hz test frequency, so they seem to be fine also. Then I noticed T2 transformer which seemed to be covered in red goo and took it off to measure it also. Used 1kHz to measure pins 3-4: 120.2mH, pins 2-5: 4.220mH, pins 8-9: 1.2µH, pins 9-10 111.1µH
Primary side of T2 is pins 3-4, secondary sides: 2-5 and 8-9-10 where 9 is common for pins 8 and 10. T2 seems to be driving two transistors which seemed to be fine when I measured them. So does T2 values seem odd to you or are those typical?
Well anyway I am done for today.