Mac mini Server Mid 2011 A1347 820-3017-A Schematic

[Baludoki80]

The upper ram slot memory 3x beeps the lower ram slot works.The motherboard is 820-3017-A,i looking shematics for my mac mini.the soldering on all the connector legs of the upper ram slot is perfectly good,motherboard failure i think. :/

Thank you for help.