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Power supply testing

viczulis

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Heres what I got. I have a 500 watt power supply that wont power up two different towers.
The towers are pretty basic ones a P4 with AGP video card one hard drive, the other is a basic board with on board video and one hard drive, each have a DVD burner and thats about it. Nothing special or power demanding.
I have a digital tester and everything test good. 20 pin, 24 pin, 4 pin power, all satas, all molexes.
You turn either computer on fans spin but nothing comes up on screen. I connect my 650 watt supply in and both towers fire up.

How would you test under load it has to be failing there but I dont know how to test.

:banghead:
 

sneekypeet

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connect a fan and a fan controller?

Connect it to anything that draws 12V, 5V and 3.3V so you can check with a DMM whats being pushed. my guess is a weak 5V line.
 

cdawall

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hook some fans up to the molex's big fans work better.
 

viczulis

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Case CM HAF , G-5 mouse, Saitek Cyborg Keyboard
Audio Device(s) Supreme FX 2 Audio Card
Power Supply ABS Tagan BZ Series 900 W Modular
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Will try. Thanks guys :toast:

Okay got five 120 fans running with no problems thats all I have with molex getting reading of 5.2 got to find cables to turn three pins into molex to keep going.
 
Last edited:

sneekypeet

Retired Super Moderator
Joined
Apr 12, 2006
Messages
29,409 (4.46/day)
System Name EVA-01
Processor Intel i7 13700K
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Cooling ASUS ROG Ryujin III 360 with Noctua Industrial Fans
Memory PAtriot Viper Elite RGB 96GB @ 6000MHz.
Video Card(s) Asus ROG Strix GeForce RTX 3090 24GB OC EVA Edition
Storage Addlink S95 M.2 PCIe GEN 4x4 2TB
Display(s) Asus ROG SWIFT OLED PG42UQ
Case Thermaltake Core P3 TG
Audio Device(s) Realtek on board > Sony Receiver > Cerwin Vegas
Power Supply be quiet DARK POWER PRO 12 1500W
Mouse ROG STRIX Impact Electro Punk
Keyboard ROG STRIX Scope TKL Electro Punk
Software Windows 11
daisy chain more fans or add some sort of 12V device to a line to keep a bigger draw on it. See if the line drops out. Something has to be going on near the higher end of the power band.

If you are brave, open it up and see if the caps inside are all good, and maybe clean out anything that may be adding resistance inside the PSU.

I'm guessing each fan is under an amp a piece, so even though they are running it doesn't produce anywhere near the draw of the PC.
 

viczulis

New Member
Joined
Dec 29, 2007
Messages
887 (0.15/day)
Location
Ohio
System Name Bandit 7
Processor Intel I7 920 (Havent OCd yet)
Motherboard MSI X58 Pro
Cooling Air Black Knight
Memory 6 Gbs of something
Video Card(s) 2 - XFX 5770s 1 Gb (waiting for a price drop to go higher)
Storage 1 - TB Sata Seagate
Display(s) 28" LCD
Case CM HAF , G-5 mouse, Saitek Cyborg Keyboard
Audio Device(s) Supreme FX 2 Audio Card
Power Supply ABS Tagan BZ Series 900 W Modular
Software 64 bit Windows 7 Home Premium
One 12 volt line drops have DVD drives on when opening doors with all fans running it goes from 12.1 to 12.0 will have to find more to draw some power. Dam it cant be easy :laugh:
 
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