<div dir="ltr"><div>Oggi abbiamo avuto l'occasione di provare il nuovo "Power supply tester" con un PC che non partiva correttamente. Il tester [¹] in effetti dava allarme sul segnale di "PG" (Power good) con valori di circa 30 ms, mentre le tensioni indicate erano corrette. </div><div><br></div><div>La spiegazione del segnale la troviamo su Wikipedia [2]</div><div><br></div><blockquote style="margin:0 0 0 40px;border:none;padding:0px"><i><span style="color:rgb(37,37,37);font-family:sans-serif;font-size:14px">Power good value is based on the delay in </span><a href="https://en.wikipedia.org/wiki/Millisecond" title="Millisecond" style="text-decoration:none;color:rgb(11,0,128);background-image:none;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;font-family:sans-serif;font-size:14px">ms</a><span style="color:rgb(37,37,37);font-family:sans-serif;font-size:14px">, that a power supply takes to become fully ready. Power good values are often considered abnormal if detected lower than 100ms or higher than 500ms.</span><sup id="gmail-cite_ref-1" class="gmail-reference" style="line-height:1;unicode-bidi:isolate;white-space:nowrap;font-size:11.2px;color:rgb(37,37,37);font-family:sans-serif"><a href="https://en.wikipedia.org/wiki/Power_good_signal#cite_note-1" style="text-decoration:none;color:rgb(11,0,128);background-image:none;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;background-color:initial">[1]</a></sup></i></blockquote><div><br></div><div>Come indicato da altre parti esistono però alimentatori di "bassa qualità" che semplicemente collegano il segnale alla +5V, facendo si che il segnale vada alto subito all'accensione. Questo spiega il tempo PG molto basso.</div><div><br></div><div>Quindi direi che l'alimentatore non è guasto, ma che forse non gestisce correttamente il segnale.</div><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><div style="font-family:arial;font-size:small"><i>Fabrizio</i><br></div><div style="font-family:arial;font-size:small"><i><br></i></div><div><i style="font-family:arial;font-size:small">[1] </i><font face="arial"><i><a href="https://www.amazon.it/Alimentatore-Tester-Display-Computer-diagnostica/dp/B019GQAJCM/ref=sr_1_fkmr0_2?ie=UTF8&qid=1484428396&sr=8-2-fkmr0&keywords=Atx+power+supply+tester+lcd+display+screen">https://www.amazon.it/Alimentatore-Tester-Display-Computer-diagnostica/dp/B019GQAJCM/ref=sr_1_fkmr0_2?ie=UTF8&qid=1484428396&sr=8-2-fkmr0&keywords=Atx+power+supply+tester+lcd+display+screen</a></i></font></div><div><font face="arial"><i><br></i></font></div><div><i><font face="arial">[2] </font><a href="https://en.wikipedia.org/wiki/Power_good_signal">https://en.wikipedia.org/wiki/Power_good_signal</a></i></div></div></div>
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