Wx-dc12003 Schematic
If the output is "noisy" or the 12V rail is sagging, the electrolytic capacitors on the output side have likely dried out.
But the story of was just beginning.
Through visual inspection of dozens of boards, these ICs appear most frequently: wx-dc12003 schematic
: You can find 3D renderings and CAD files on GrabCAD and 3D ContentCentral . If the output is "noisy" or the 12V