7 VSB from power supply?? - Techist - Tech Forum

Go Back   Techist - Tech Forum > Computer Hardware > Hardware Repairs and Troubleshooting
Click Here to Login
Closed Thread
 
Thread Tools Display Modes
 
Old 05-11-2007, 11:31 AM   #1 (permalink)
Newb Techie
 
Join Date: May 2007
Posts: 2
Default 7 VSB from power supply??

Computer won't turn on. When I push the switch, absolutely nothing happens. Here's what I've looked at so far:

When plugged in, the green led on the motherboard lights up, the motherboard has around 3 volts at the switch pin, the switch tests out ok,(shorting between the switch pins does nothing).

Checking the voltage at the 20 pin connector from the power supply yields the following: 2.4V at the PS_On green wire and 6.5 to 7 Volts at the VSB purple wire. VSB is suppose to be 5V from what I can tell. Is 7 V (or that it's voltage varies between 6.5 and 7) indicative of a PSU problem? Would it hurt the motherboard?

After jumping the PS_On wire to ground the power supply fan comes on and I get voltage that appear to be ok on all the other pins (as well as on the other connectors) 4.9V on red, pink and grey, 3.3V on Orange, 11.6V on yellow, -11.8V on blue and -5V on white.

Does this look like a power supply issue? Any advice on what to do next would be appreciated?

Computer is an emachine T2885 with a Bestec ATX-250-12E Rev P7 power supply, D845EPI/D845GVSR Intel motherboard and Pentium 4.
__________________

GregJ is offline  
Old 05-14-2007, 11:36 AM   #2 (permalink)
Newb Techie
 
Join Date: May 2007
Posts: 2
Default Re: 7 VSB from power supply??

Does anyone here know if a standby voltage of 6.5 to 7 Volts is indicative of a bad power supply?

Thanks,

Greg
GregJ is offline  
Closed Thread

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Can I use ATX Power supply without -5 volt out jar99 Monitors, Printers and Peripherals 2 05-12-2007 02:28 AM
What power supply should i get. jonmon6691 New Systems | Building and Buying 10 05-10-2007 03:47 AM
power AC adapter with PC power supply? samuraiwarrior Hardware Repairs and Troubleshooting 0 04-23-2007 12:54 PM
Test to see if new power supply bad? darsunt Hardware Repairs and Troubleshooting 13 04-06-2007 11:57 PM
just changed power supply, weird harddrive problem (sata) idrisguitar Monitors, Printers and Peripherals 0 03-31-2007 11:47 AM



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 10:53 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.