On July 22, 2015 03:26:48 PM Andrew Deryabin wrote: > I think it's over-voltage (power supply was also broken).
Hiya! Hopefully it was not AC input over-voltage (storm surge etc.) Otherwise if it is a regular box type power supply, and sometimes even server supplies, if you open the power supply cover there is a good chance that you will find bulged capacitors - the number one failure of power supplies everywhere. Although it is somewhat rare to have catastrophic over voltage /output/, I've seen it happen with ugly blackened charred circuit results. Usually as capacitors slowly go bad, a supply simply becomes weaker. But a supply typically uses one of the output lines (say the +5V line) to tap voltage feedback which self adjusts the regulation circuits. Sometimes the capacitors on that line go bad such that they cause too much load on the line or else very weak filtering and high ripple voltage. Then the regulation attempts to compensate by driving harder to put more voltage on that line to make it increase to the correct voltage (say +5V). But in doing so, the supply unwittingly /increases/ all the other supply's output voltages beyond their rating, since all output voltages come from the same output transformer. With catastrophic results. Next supply you buy, if you want to trust it, ask a qualified technician (well, me for example), to check the brands of capacitors in there. If they are crappy brands such as Ltec, OST etc. do not trust it. Ask the tech to install only trusted Japanese brands. My order of preference: 1: Panasonic. The (my) absolute go-to number-one trusted brand, ever! 2: Nichicon, United Chemicon etc. all very fine manufacturers. Tim. ------------------------------------------------------------------------------ _______________________________________________ Lmuse-developer mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/lmuse-developer
