Re: A "nice" YoungYear unit?
Check your multimeter batteries. Some multimeters, when they get low batteries, they tend to show higher voltage.
Most likely not, even though some of your voltages are outside of ATX spec. But modern motherboards can cope a little better with voltage variations (especially higher voltages), since most chips are behind some type of voltage regulator (be it buck or linear).
Yeah, totally understandable. If there is one thing I don't like to do, it's repeat repairs. Had an LCD monitor like last week - big input filter CapXon cap started going bad (leakage from the bung on one lead.)
+1
ATX spec calls for +/-5% on 3.3V, 5V, and 12V rails, IIRC. So that's:
3.135 - 3.465V
4.75 - 5.25V
11.4 - 12.6V
But like I mentioned above, modern motherboards can cope a little easier with voltage variations, especially higher voltages. Back in the days though, some of these rails were used directly to power certain chips. For example, SDRAM was often powered directly from the 3.3V rail and any TTL chips from the 5V rail. So going outside of that specs on voltage (and also ripple) meant potential trouble.
Nowadays, I think only the LPC SIO is powered directly - typically the 5VSB... if not a 3.3V STBY rail generated from the 5VSB. So in any case, most chips have some type of regulator behind them.
The only hardware that is still vulnerable are mechanical HDDs. In particular, their spindle motor is often controlled by a chip+FET combo. When ripple is really high or voltage outside of spec, they tend to run hotter and may shorten the lifespan of the HDD.
Originally posted by bauto601
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Originally posted by bauto601
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Originally posted by bauto601
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Originally posted by Drack
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ATX spec calls for +/-5% on 3.3V, 5V, and 12V rails, IIRC. So that's:
3.135 - 3.465V
4.75 - 5.25V
11.4 - 12.6V
But like I mentioned above, modern motherboards can cope a little easier with voltage variations, especially higher voltages. Back in the days though, some of these rails were used directly to power certain chips. For example, SDRAM was often powered directly from the 3.3V rail and any TTL chips from the 5V rail. So going outside of that specs on voltage (and also ripple) meant potential trouble.
Nowadays, I think only the LPC SIO is powered directly - typically the 5VSB... if not a 3.3V STBY rail generated from the 5VSB. So in any case, most chips have some type of regulator behind them.
The only hardware that is still vulnerable are mechanical HDDs. In particular, their spindle motor is often controlled by a chip+FET combo. When ripple is really high or voltage outside of spec, they tend to run hotter and may shorten the lifespan of the HDD.
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