can u pls help me point out the trouble in the atx psu i am trying to repair. it powers up but its voltage is lower than its specifications. yellow wires- (only +7.5 volts, should be +12v, red wires - only 2 volts, should be +5 v). what could be the problem and where do i start?
how about if the atx psu does not turn on when the green wire-black wire is shorted? should i direct my troubleshooting on the controller circuit for PS# ON or should i check first the primary side of the PSU?