On Wed, 21 Jan 2004 04:23:30 GMT, "techforce"
wrote:


Didn't anyone read my post about the keyboard being enabled for power
on/off? I'm saying, - I had three systems that burned out more than
one power supply, and each time the cause was due to the constant draw
of power for the keyboard. The problem was solved by changing the
jumper on the MB to disable this function. A special power supply is
needed to avoid having problems if keyboard power is enabled.

The first supply was probably designed for the unit, subsequent
supplies probably had inadequate 12v standby current.

Make certain that keyboard switching is disabled in both the BIOS and
via jumper. If necessary consult the manual for the MB.

I've repaired and built hunderds of computers, and this has been the
only situation I've ever encountered which caused multiple power
supply failures. While dirty AC is a worry, it's more likely to cause
damage to the MB than to the power supply.

.Steve .

They have Overload Protection on the DC side to protect it against a Short
on a DC line.


Sounds like his AC power is Dirty on that outlet. Have seen alot of weird
stuff happen to PC Power Supplies when the Freq and voltage fluxuates on the
Input - say because of a Downed arcing power line somewhere. Smaller Cities
and remote villages dont have exorbidant Power Protection for their electric
power sources, basicly du to lack of funding....so this is becoming more
common since power Demand is greater then ever before - WORLDWIDE , because
of the Number of PC's and people using Electricity etc.

A Power Surge protector "MAY" help, but theres always the possibility
something may happen where it was not designed to see. A UPS wil definately
solve the problem, but the dirty power will probably take out the UPS sooner
or later....


"James Sweet" wrote in message
news:GZlPb.91901$Rc4.520400@attbi_s54...

"jbr" wrote in message
m...
No 2 power supplies were the same. Here are the specifics of the ones
I used.

1st supply: L&C Technology Inc. LC-250ATX; believed to be original 2.5
years

2nd supply: No name wholesale (historically their parts are reliable)
- 350 Watt; lasted 6 days

3rd supply: QMAX LC-B300ATX; lasted 5 seconds but had been running for
2 weeks in a different machine.

FYI - The +5vsb light on my ATX power supply tester still lights when
hooked up to all three power supplies.


That's really weird, I thought almost all supplies had thermal shutdown.