Hi,
I have an ATX 450w psu that has bad caps(the bigg 200v ones that probably form the half bridge together with the chocke). I have some spares but they are half the nominal value of the original ones.I put them and the psu seems to work fine but the ripple levveles are high :200mv high and switching transients are way higher.
I did the mesurements under slight load at bootup.Is this fix safe or i should relly struggle to find caps of the right value that fit? I don't think i'll push it beyond 200W.My other psu is a 500w model and uses 470u in series....what my new caps are.The old ones were a pair of 820u in series.
Output voltages seem to be in speck or 10mV out.
PS:The new caps are 200V each so the voltage rationg is ok.My concern is about the capacitance.