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<blockquote data-quote="Vipersan" data-source="post: 781129" data-attributes="member: 325666">Good point CH ...but generally this applies to all mass produced cheap stuff from the far east ..Not always design problems ..but often the quality or purity of the silicon and various substrates used ..A bad batch is a bad batch ..In this case ..psu failure of the primary side psu was imo brought about by the failure of the double diode dc rectifier on the secondary side ..ie ..a greater demand for power increased load by the diode going s/c ...and the eventual demise of the entire primary..The failure of this double diode in turn ..would most likely be due to changing electrolytic conditions within poor quality caps..etc These too will be changed ..Perhaps&nbsp; I should have said 'in order that the repair is reliable as possible'.As A footnote ..Poor quality elec caps are responsible for about 80% of psu failures ..the rest is usually poor quality silicon ..rgdsVS</blockquote>

[QUOTE="Vipersan, post: 781129, member: 325666"] Good point CH ...but generally this applies to all mass produced cheap stuff from the far east .. Not always design problems ..but often the quality or purity of the silicon and various substrates used .. A bad batch is a bad batch .. In this case ..psu failure of the primary side psu was imo brought about by the failure of the double diode dc rectifier on the secondary side ..ie ..a greater demand for power increased load by the diode going s/c ...and the eventual demise of the entire primary.. The failure of this double diode in turn ..would most likely be due to changing electrolytic conditions within poor quality caps..etc These too will be changed .. Perhaps I should have said 'in order that the repair is reliable as possible'. As A footnote .. Poor quality elec caps are responsible for about 80% of psu failures ..the rest is usually poor quality silicon .. rgds VS [/QUOTE]

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