Testing PS Question(s)

  • Thread starter Thread starter SpeeDTraP
  • Start date Start date
S

SpeeDTraP

My PC died the other day and I ordered a new ATX PS for it ... after
installation and making sure all the proper connections have been
made, I press the power_on button and ZIP ... NADA ... nothing ... no
lights no fans , nothing.

My question is can I remove the power supply and jumper the
motherboard connector pins 14 and 16 to test the PS voltages ... and,
will running the PS unloaded harm it in any way ?? TIA
 
SpeeDTraP said:
My PC died the other day and I ordered a new ATX PS for it ... after
installation and making sure all the proper connections have been
made, I press the power_on button and ZIP ... NADA ... nothing ... no
lights no fans , nothing.

My question is can I remove the power supply and jumper the
motherboard connector pins 14 and 16 to test the PS voltages ... and,
will running the PS unloaded harm it in any way ?? TIA
Click to expand...

you can do that

i sometimes connect the power pins to a harddrive to put osme kind of load
on the power supply

if your new supply checks out ok
be sure to ckeck your old one as it may also be good

additionally...be sure to see if you can reset the bios
it;s possible your board just lost it's settings
....many boards have a jumper for doing so
 
you can do that

i sometimes connect the power pins to a harddrive to put osme kind of load
on the power supply

if your new supply checks out ok
be sure to ckeck your old one as it may also be good

additionally...be sure to see if you can reset the bios
it;s possible your board just lost it's settings
...many boards have a jumper for doing so
Click to expand...
Okay, thanks philo, I'll test both supplies this afternoon ... this is
a PC Chips MB for which I don't have a manual ... have heard of the
BIOS clear jumper but have no idea whether or not this board has such
a thing ... if both supplies checkout good, any other ideas about a
possible problem .... cooked MB or CPU ?? I have a new Biostar
M7NCD Pro to put in it but have not yet gotten the new processor,
memory or video board for it yet . TIA
 
The bios jumper is on most modern boards is located near the battery....you could pull the plug and remove the battery to clear the
CMOS.
 
The bios jumper is on most modern boards is located near the battery....you could pull the plug and remove the battery to clear the
CMOS.
Click to expand...
Okay ... I tested both supplies and they both test good while loaded
with a spare CD Rom I have ... I pulled and reinserted the EPROM
battery and still have the same thing ... nothing ! Anyone have any
suggestions what to do next ?? TIA
 
you pulled battery pulled plug and waited 20 minutes or so?
Click to expand...
Well, actually it was about 5 minutes before re-inserting the battery
.... is it necessary to have it removed for 20 minutes ? TIA
 
SpeeDTraP said:
My PC died the other day and I ordered a new ATX PS for it ...
after installation and making sure all the proper connections
have been made, I press the power_on button and ZIP ... NADA ...
nothing ... no lights no fans , nothing.

can I remove the power supply and jumper the motherboard connector
pins 14 and 16 to test the PS voltages ...
Click to expand...

Yes, but why not connect pin 14 (green wire) to either pin 13 or 15
(black wires), right next to it, since this is easier to remember?
and, will running the PS unloaded harm it in any way ??
Click to expand...

No, but some supplies won't run without a load on the +5V line, which
can be provided by connecting an approximately 10-20 ohm, 10 watt
resistor between any red and black wires.

Other things to check are the +5V standby line (pin 9, purple), which
should always have about +5V on it whenever the power supply is
plugged in and any rear switch on the supply is turned on (not all
supplies have such a switch). If your motherboard has an LED to
indicate standby power, it should light, or you can connect a voltage
meter's leads (a cheap digital volt-ohm meter is a very good
diagnostic tool) to the purple wire and any black wire. If this line
is within 5% of 5V but the fans still don't run, then check the
voltage on pin 14 because it should be less than 0.8V after the power
button on the front is pressed. If it stays above about 3.3V, then
the motherboard isn't sending a proper signal to this pin, either
because the button isn't connected to it properly, the button or its
cable is bad, or the motherboard is bad.
 
on some systems the power to the board remains for some time...others its immediately. If I'm not able to short the jumper and use
the battery technique I wait a while to make sure. You would normally see a 'Checksum error' when the job is done right.
 
Okay .... pulled the CMOS battery for about 45 minutes ...
re-installed it and up it came !! It stated that the memmory amount
was being reported incorrectly and did I want to load defaults to
start system ... I chose to load default settings and it loaded
windows like a charm ... I did have to go into the bios and reset the
amount of memory used for the onboard video and reload the drivers for
the audio, video, and LAN ... but other than that, it seems to be
working fine .... thanks much to all those who resopnded !!! Now I
have a spare power supply !! <BSEG>
 
to clear your cmos look to see if there are three pins near the cmos
batery
with a jumper between two of them

with no power to the board

put the jumper on the other position
then move it back


another thing to try is ...
remove all hardwate but the RAM and video card and see if anything happens

try substituting RAM if possible

but if it still does not work then it;s pretty hard to tell if it;s the
board
or the cpu

you could remove the cpu and inspect it for signs of burning ....
 
to clear your cmos look to see if there are three pins near the cmos
batery
with a jumper between two of them

with no power to the board

put the jumper on the other position
then move it back


another thing to try is ...
remove all hardwate but the RAM and video card and see if anything happens

try substituting RAM if possible

but if it still does not work then it;s pretty hard to tell if it;s the
board
or the cpu

you could remove the cpu and inspect it for signs of burning ....


I got the system to bootup and got all the drivers reinstalled but there are still some
Click to expand...
issues with the whole thing .... for one thing there is still a
herringbone pattern in the video ... can I put the 1.4 ghz Thunderbird
on the M7NDC Pro MB and use PC3200 Ram in case I ever want to upgrade
the CPU ?? TIA
 
issues with the whole thing .... for one thing there is still a
herringbone pattern in the video ...
Click to expand...

it could be the video card or drivers

*or* the cable

also, do you have anything nearthe monitor such as speakers or a clock???
 
it could be the video card or drivers

*or* the cable

also, do you have anything nearthe monitor such as speakers or a clock???
Click to expand...
Nothing to speak of near the monitor ... the physical setup has been
the same for more than a year now with no previous problem ... the MB
is an integated unit with onboard video, audio, lan, and modem ...
I've been looking to improve the performance of the system and this
present problem is accelerating the project ... I was going to wait
until I could afford to get a new processor, memory sticks and a new
video board but I could swing the new memory and mid-range video board
right now if I could use the T'bird 1.4 ghz on the M7NCD Pro MB I
already have.
 
Back
Top