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Message body Emoticons View more Emoticons	Font colour: Default Dark Red Red Orange Brown Yellow Green Olive Cyan Blue Dark Blue Indigo Violet White Black  Font size: Tiny Small Normal Large Huge Close Tags [quote="Pacovich"]Don't you love the term flyback, minnie? No problems with the name we give it. I refer to the transformer of the first switching power supply of the system who is sometimes called also flyback, position 5500. It is on all the time the plug is connected. Also while the main switch is off. Its quality aspect is not very good in my opinion but in the photographie in an official document its aspect is very good. I think they made any bad ones in the beginning and after some defaillances they changed the design or the level of quality (I say I think). I have tested severals capacitors next to the supply and they seem to be ok. I change the voltage reference IC TL431 and it's not the problem. The optocoupler seems to be ok. The TNY256 is capable to autolimit itself and I think it is doing due to any primary coils in short-circuits that overload it. I think in a problem in the primary of the transformer. The external coils are not isolated and I don't expect a better situation internally. I envisage a solution that I don't love very much: installing extra supplies in order to provide 24V, 9V and 3V3 external to the mainboard, adjust the voltages to simulates the original situation. It's also necessary to nullify the original supply. If anyone does it, it will be absolutely at his own risk.[/quote]
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