Question about Powmax ATX Power Supply Tester Power Supply

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I have a Power Judge ATX power supply tester. I put it on several power supplies that I believe to be good and the RED OVERVOLTAGE light comes on along with all the GREEN LIGHTS except (-5V). I have 2 testers and both do the same thing. Are my power supplies bad or are my testers bad? Do I need to worry about damaging motherboards with these power supplies?

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Try to measure voltage on power supply with a more acurate tester and you will see if your power tester is good or not. This is the easy way to control acuracy of your tester.

Posted on Apr 04, 2011

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Does a solid green light mean the power supply is ok when disconnected from motherboard and drives, ATX-300-12Z


Not necessarily. The green light usually just signifies power to the power supply. Amazon sells a cheap power supply tester that can verify everything on a power supply from old to new.

Jul 21, 2014 | HP ATX-300-12Z, ATX-300-12Z Rev. CDR, HP...

1 Answer

How do I know if the power supply is bad on gateway gt5676 computer? I push power button and nothing happens. I unplug it and the green light flashes on the power supply( Bestec ATX 300 12 EB3). Plug it...


u can buy power supply testers, just a device you plug the power supply into, or try a new power supply. but if nothing is happening no fans etc theres a good chance its just the power supply.

Jun 17, 2012 | Computers & Internet

1 Answer

Power supply compitable for cac-to5-uw?


ATX is a standard.
Any case described as ATX should accept any ATX powers supply.

The only thing you need to decide is how many watts the power supply needs to provide.
To find this out, put "Computer power supply calculator" into Google.
Pick one, or several, and enter the details of what you are going to put in the case.
Enter what you would like to put in the case finally, not just the bits you have to start with.
Like that second internal hard drive, and double the memory, Two DVD drives.
Extra cooling fans?
Then pick a pick a power supply that provides more than that.
No-one has ever run into problems with a power supply running too cool.

Feb 10, 2011 | Cooler Master Elite ATX Midi Tower Case...

1 Answer

During a recent storm our power went out and a family member was on our Gateway 504GR. Since the power came back on, the computer will not turn on. It was plugged into a surge protector and all other items...


Suggest the Power Supply took a 'hit' from the storm. Hopefully this is all that received the power surge.

Surge protectors are a necessary item, but in reality it takes an Expensive surge protector, for defense against a lightning storm, and even that isn't a sure bet.
(Lightning strikes can produce over a Million volts)

Also, I have had three surge protectors where just THAT receptacle was bad.

"Hmmmm, surge protector power on LED is lit. Printer has power, monitor has power, and router has power. Surge protector must be good."

NOT.
Just THE receptacle the computer was plugged into was bad.

Past this test, I would suggest diagnosing the Power Supply.

A) Test the Power Supply voltages

B) Use a KNOWN to be Good, Compatible power supply, for a test unit.

C) Buy a power supply, and replace it.
Granted, not a professional approach, and could result in a waste of money.
Some do approach repair in this manner, however.

Going backwards.

C) The Gateway 504GR desktop computer uses an ATX style of power supply, and is rated at a maximum Wattage rating of 300 Watts.

(ATX case is approximately 6 inches Long, 6 inches Wide, and 3-1/2 inches Tall)

Gateway Support > 504GR desktop computer > Support Documents main page,

http://support.gateway.com/s/PC/R/3724/4365nv.shtml

If you Left-click on - Components, you will see a list of components used in the 504GR.
Scroll down to the heading - Power Supplies

Left-click on the blue -
102015 - 300 Watt Power Supply, heading.

It's just a generic ATX power supply with a,

1) 24-pin ATX main power cable,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain24

2) 4-pin ATX +12 Volt power cable,

http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4

[ Power for the Intel Pentium 4 processor. Plugs into the motherboard ]

3) (1) SATA power cable

http://www.playtool.com/pages/psuconnectors/connectors.html#sata

[Power for the SATA harddrive ]

4) At least two 4-pin Peripheral power cables,

http://www.playtool.com/pages/psuconnectors/connectors.html#peripheral

[Power for the CD drive, and the DVD drive ]

This is just one example of a decent, reliable, economical Power Supply, that will fit the bill,

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=1389575&CatId=1078

B) The above explains the minimum Wattage needed for the test unit, the size, and shape of the case, and the needed power cables, in case there is a power supply around to use for a test unit.

(Some have an older unused computer sitting in a closet, or what have you. The computer can be temporarily cannibalized for the power supply)

1) That SMPS (Switched-Mode Power Supply) puts out three DC voltages.

A) 3.3 Volts
B) 5 Volts
C) 12 Volts

(Two C cell flashlight batteries produce 3 Volts DC)

The test is done for the 12 Volt power rail.
ALL Yellow wires in the various power cables, are 12 Volt wires.
They all go back to one 12 Volt power rail inside the Power Supply.

[Orange insulated wires are 3.3 Volts.
Red wires are 5 Volts ]

11 to 13 Volts indicates a good Power Supply.
Less than 11 Volts means it's time to replace.

You can use a multimeter to check the 12 Volt power rail, or a power supply tester.
One example of a power supply tester,

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=5250576&CatId=5471

An economical multimeter good enough for this test, can be purchased from $5 to $12.

The Power Supply is unplugged from power.
The Positive (Red) probe lead of the multimeter, is connected to ANY Yellow wire.

The Negative (Black) probe lead is connected to ANY Black wire.

(ALL Black wires are Ground wires. They all go back to one central Ground source inside the PSU.

{Power Supply Unit. Another term for Power Supply. Also another term for the SMPS, used in personal computers)

To reply just Left-click on Comment. (Believe upper right of your page )

Jun 20, 2010 | Computers & Internet

1 Answer

E Machine ATX 250 -12E replacement PS


With emachine MOBO's you have to make sure you plug in the 20 pin plug from the power supply to the mobo. Also make sure all hard drives, cd/dvd roms, floppy drives, etc are turned on. Make sure the red switch on the PS is set to 115. Make sure the PS is plugged into a known working outlet. Make sure MOBO is properly in place with all grounds/screws in place and nothing metal near or touching board which may short it out.

You can review the E Machines PS replacement guide here for further instruction.

Good Luck,

Jesse

Jan 11, 2010 | Gateway Emachine Bestec ATX-250-12E PS...

1 Answer

Bad power supply?


Do yo have a volt meter or an atx psu tester?
you can check voltage to see

If a power supply is bad, your pc will turn off or/and turn on and turn off. As long as your system is running without and shut downs your good.

However if your pc is turing off, I would change it as soon as you can. basically what is happening, when you unplug everything there isn't much of a draw on power so the light remains steady, but when you plug devices in there is a draw and the PSU cannot deliver.

I hope this helps.

Sep 07, 2009 | HP ATX-300-12Z, ATX-300-12Z Rev. CDR, HP...

1 Answer

No Power out put.


short the color green and black of your atx... use a metal wire.. don't wory it won't harm you... just unplug all the connection that is connected from you ATX.... short the said wire then plug your ATX to the outlet.. if fan is running then there's no problem on your ATX.. if not then you need to replace a new one...

Jul 20, 2009 | HP Bestec ATX-1956D 200w HP Part No...

1 Answer

Computer won't boot up


Have you tried a higher rated ATX power supply? Preferably a 350w.

Apr 22, 2009 | ASUS SiS Chipset TUSI-M Motherboard

1 Answer

Power supply wont come on


I've check and that board uses an ATX power supply. that is your problem. slap in an ATX and you'll be good to go. Please be so kind as to rate this answer thanks and good luck.

Jan 28, 2009 | ASUS A8N-SLI Premium Motherboard

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