Sir pharaon . . .
UNISYS techno info ain't easily / readily available . . .especially when they source it out of Korea, from the back door of Hyundai.
REFERENCING:
Your very first photo, with the dominating large BLACK canned main filter capacitor for the AC line supply, being just left of top center.
There is a folded around alum metal heat sink for the HEATSINKING of the POWER FET of the SMPS.
Me thinks that I see a hole where the screw used in mounting it used to be.
Was it someone else . . . . or you . . . . . that pulled that part ?
I think that it might be labeled as Q801 on the board area near it.
Also, is it being fed by a nearby 8 pin mini IC . . . .IC801 . . .with it being a KA3842 ?
ABOVE . . .
I'm just testing to see if I have a like Hyundai schematic . . . . and how many miles per gallon that it gets.
73's de Edd
.....