I'm working on a N149a p/s, s/n 703536, 2-pin ac jack. The v2 and V3 voltages are measuring +30v and -30v with pins 2 and 5 bridged, V1 is 14.2v. The converter is outputting 12v. Would the fault be in the IC LT1172 switcher or should I look for other parts? A board layout would be helpful to identify the SMDs, I have the schematic.