Electricity/Electronics Gurus, help please
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From: w_tom on 23 Apr 2008 15:00 On Apr 23, 11:35 am, "Brian Cryer" <brian.cr...(a)127.0.0.1.ntlworld.com> wrote: > I suggest you follow Kony's suggestion and obtain (or borrow) a differentpower supplyand see if it makes a difference. The better suggestions from Kony were: > 1) Capacitors may be failing. Examine mobo and psu > (leave psu unplugged for a few minutes before opening it). > 2) Multimeter readings of psu voltage are a good start > towards realizing if the regulation is ok (assuming #1, > that capacitors are still viable). Replacing the power supply only creates a maybe answer. Kony's suggestions provide a definitive answer - and requires both less time and less labor.
From: MF on 23 Apr 2008 15:33 "MF" <cheatsandlies(a)spammersbl0w.com> wrote in message news:8bqdnfu9L4aj_5PVnZ2dnUVZ_jWdnZ2d(a)comcast.com... > Running the Socket 7 board it shuts down after 30-40 minutes. And, > again, I am thinking that if the PSU were good, it would run that board > for days. > > Right? Wrong? > > Thanks! > > Mike Thanks to all for the help. I really didn't phrase the question correctly - it was: is the socket 7 board's load so light that the PSU will shut down from insufficient load. The answer is no. So the "yep" answer to the poorly phrased question was right :). Mike
From: kony on 23 Apr 2008 20:11 On Wed, 23 Apr 2008 15:33:13 -0400, "MF" <cheatsandlies(a)spammersbl0w.com> wrote: > >"MF" <cheatsandlies(a)spammersbl0w.com> wrote in message >news:8bqdnfu9L4aj_5PVnZ2dnUVZ_jWdnZ2d(a)comcast.com... > >> Running the Socket 7 board it shuts down after 30-40 minutes. And, >> again, I am thinking that if the PSU were good, it would run that board >> for days. >> >> Right? Wrong? >> >> Thanks! >> >> Mike > >Thanks to all for the help. I really didn't phrase the question correctly - >it was: is the socket 7 board's load so light that the PSU will shut down >from insufficient load. The answer is no. > >So the "yep" answer to the poorly phrased question was right :). Actually that is possible, if the PSU is regulating by 5V rail feedback yet has a very strong 12V rail, a very light loading of that 12V rail could conceivably cause it's voltage to rise high enough that the overvoltage protection kicks in and turns it off. This isn't very common to have happen, but very reproducible on some PSU that otherwise work fine.
From: w_tom on 24 Apr 2008 15:39 On Apr 23, 3:33 pm, "MF" <cheatsandl...(a)spammersbl0w.com> wrote: > Thanks to all for the help. I really didn't phrase the question correctly - > it was: is the socket 7 board's load so light that the PSU will shut down > from insufficient load. The answer is no. Again, to expand on Kony's answer - the only way anyone can answer that question is to read manufacturer specs for that power supply. Some supplies state no problem with zero load. Others state a minimum current must be consumed. These numbers are unique to each design. However, Radio Shack used to (don't know if they still do) sell 50 ohm 10 watt resistors for less than $1. Simple connect one of these to the 12 volts. That should add more than a sufficient load for the 12 volts. If nothing else, that resistor is a simple and informative test.
From: kony on 24 Apr 2008 21:59
On Wed, 23 Apr 2008 15:33:13 -0400, "MF" <cheatsandlies(a)spammersbl0w.com> wrote: > >"MF" <cheatsandlies(a)spammersbl0w.com> wrote in message >news:8bqdnfu9L4aj_5PVnZ2dnUVZ_jWdnZ2d(a)comcast.com... > >> Running the Socket 7 board it shuts down after 30-40 minutes. And, >> again, I am thinking that if the PSU were good, it would run that board >> for days. >> >> Right? Wrong? >> >> Thanks! >> >> Mike > >Thanks to all for the help. I really didn't phrase the question correctly - >it was: is the socket 7 board's load so light that the PSU will shut down >from insufficient load. The answer is no. > >So the "yep" answer to the poorly phrased question was right :). > >Mike One other thing that's important to remember is that you are trying to generalize ideas but with PCs there are often exceptions to the *rule*, and since you never did tell us specifics about the hardware including the PSU make, model, current ratings, any answer that might usually be right is not nearly as appropriate as one that considers the specific hardware you have. |