Jump to content


Photo
- - - - -

power supply 12volt drops

psu low voltage

  • Please log in to reply
5 replies to this topic

#1 SpikeSoprano

SpikeSoprano

    Total Nerd

  • Members
  • PipPipPipPipPip
  • 2164 posts
  • Gender:Male
  • Location:Cape Breton,Canada

Posted 12 November 2017 - 08:54 PM

When I game with hardware monitor running I've noticed my 650 watt psu's 12 volt reading drops to 11.53 volts at times and the highest it reads is 11.97 volts. It has been like this almost since new which is 4 years ago. It's a LSP Ultra psu.The reason I'm asking about this now is sometimes when I oc only to 4.3 the pc goes into a no boot mode (fans start then stop  but wont enter bios until I reset cmos ).  Any opinions on this or could it be another problem ???


CPU>I7 2600K  -MB>GIGABYTE  Z68X-UD3H-B3-MEM>16 GB KINGSTON 1600 MHZ-COOLER> HYPER 212 EVO
VIDEO>NVIDIA GTX-1070-SSD>VERTEX 3 120 GB-HD>WD 2TB- G500 MOUSE
CASE>ROSEWILL CHALLENGER W/4 120MM FANS-PSU> 750WATT-MONITOR>24 INCH BENQ

#2 Braegnok

Braegnok

    Nimrod

  • Folding Member
  • 1377 posts
  • Gender:Male
  • Location:Colorado USA

Posted 13 November 2017 - 02:38 PM

Try confirming power supply is OK with a meter first,.. by measuring Voltage,..Figure 3.18  "Back probing the power supply connectors"  http://www.informit....31105&seqNum=12


Intel Core i7-8700K  

Asus Maximus X Apex

MSI  GTX 1080 Ti  

G.SKILL DDR4 4133MHz

SeaSonic SSR-1000PD

Corsair Hydro Series H115i

 


#3 paulktreg

paulktreg

    Member

  • Members
  • PipPipPipPipPip
  • 3996 posts
  • Gender:Male
  • Location:Clitheroe, UK.

Posted 13 November 2017 - 02:50 PM

The ATX specification permits the 12V rail to be anywhere between 11.4V and 12.6V so technically 11.53V is acceptable.

 

The LSP Ultra is let's say at the lower end quality wise and regardless of your problems I'd replace it with a branded unit.


i7 920/GA-X58A-UD3R/3x2GB Corsair/XFX HD7950/Seagate 1TB/Fractal Design Define R3 Case/Seasonic X-Series 760W/Acer H235H Monitor/Windows 10


#4 SpikeSoprano

SpikeSoprano

    Total Nerd

  • Members
  • PipPipPipPipPip
  • 2164 posts
  • Gender:Male
  • Location:Cape Breton,Canada

Posted 13 November 2017 - 03:18 PM

Try confirming power supply is OK with a meter first,.. by measuring Voltage,..Figure 3.18  "Back probing the power supply connectors"  http://www.informit....31105&seqNum=12


I did the back probe a while ago on the 12 volt sata connector and it read fine so it may be another problem, I wonder is it possible the bios got wanky because if I bump the memory up to 1600 mhz (which it is rated at ) or xmp profile it also won't boot, goes into boot loop.
CPU>I7 2600K  -MB>GIGABYTE  Z68X-UD3H-B3-MEM>16 GB KINGSTON 1600 MHZ-COOLER> HYPER 212 EVO
VIDEO>NVIDIA GTX-1070-SSD>VERTEX 3 120 GB-HD>WD 2TB- G500 MOUSE
CASE>ROSEWILL CHALLENGER W/4 120MM FANS-PSU> 750WATT-MONITOR>24 INCH BENQ

#5 SpikeSoprano

SpikeSoprano

    Total Nerd

  • Members
  • PipPipPipPipPip
  • 2164 posts
  • Gender:Male
  • Location:Cape Breton,Canada

Posted 13 November 2017 - 03:21 PM

The ATX specification permits the 12V rail to be anywhere between 11.4V and 12.6V so technically 11.53V is acceptable.
 
The LSP Ultra is let's say at the lower end quality wise and regardless of your problems I'd replace it with a branded unit.


I have a good Cosaire 750 I could put in it but the wires are like 10 feet long, how are Cosaire psu in ratings ?
CPU>I7 2600K  -MB>GIGABYTE  Z68X-UD3H-B3-MEM>16 GB KINGSTON 1600 MHZ-COOLER> HYPER 212 EVO
VIDEO>NVIDIA GTX-1070-SSD>VERTEX 3 120 GB-HD>WD 2TB- G500 MOUSE
CASE>ROSEWILL CHALLENGER W/4 120MM FANS-PSU> 750WATT-MONITOR>24 INCH BENQ

#6 Braegnok

Braegnok

    Nimrod

  • Folding Member
  • 1377 posts
  • Gender:Male
  • Location:Colorado USA

Posted 13 November 2017 - 06:28 PM

 

Try confirming power supply is OK with a meter first,.. by measuring Voltage,..Figure 3.18  "Back probing the power supply connectors"  http://www.informit....31105&seqNum=12


I did the back probe a while ago on the 12 volt sata connector and it read fine so it may be another problem, I wonder is it possible the bios got wanky because if I bump the memory up to 1600 mhz (which it is rated at ) or xmp profile it also won't boot, goes into boot loop.

 

 

It's the +3.3v and +5v of power you want to check,.. first test pin-8 on the 24-pin ATX connector. If not within range,.. the system never sees the Power_Good signal and therefore does not start or run properly. 

 

24-pin connector pin-out :  https://www.lifewire...-pinout-2624578


Edited by Braegnok, 14 November 2017 - 06:23 AM.

Intel Core i7-8700K  

Asus Maximus X Apex

MSI  GTX 1080 Ti  

G.SKILL DDR4 4133MHz

SeaSonic SSR-1000PD

Corsair Hydro Series H115i