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Hi, from Mark in England, UK. I have a background in electronics servicing working on the old crt based analogue tv sets and vcr’s as well as pro audio and automotive and industrial electronics and I’ve got a good working 203 watt x-box psu and I want to increase the 12 volt output to about 14.4 volts so I can use it to charge big lead-acid batteries and I’ve dismantled the psu as far as removing the little sub panel inside which carries the error detection and control electronics but I’m having trouble trying to figure out which components to change in order to increase the 12 volt output as there appears to be so many feedback circuits, all made with tiny little surface mount components. And there’s three opto-couplers, presumably one for 12 volts, one for 5 volts and one for standby switching. So does anyone here have a circuit diagram (schematic) of the 203 watt psu or does anyone here know where I might be able to get one? Any help most appreciated, thanks in advance, Mark.
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