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How to Test Power Supply

By Casemaker ·
Hi,
I need to test the power supply on a customers computer. The power supply is a Elan Vital model # evn-1355a. In one of my manuals it said to change the cmos battery and then try power, has anyone heard of this before. I am going to do that but have not yet. It is a workstation and is very compact and I need to figure out how to get in to the battery.
When I use the digital meter, what are the steps to test the power supply, how do I go about them and what should I see. Where do I put the wires from the meter etc... This is my first time trying to test a power supply.
Thank you.
"Have A Great Day And Look Both Ways"
Mark

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How to Test Power Supply

by cpratt In reply to How to Test Power Supply

I think the easiest way to test the power supply would be to swap into another machine and see if that machine show the same problems.

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How to Test Power Supply

by Casemaker In reply to How to Test Power Supply
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How to Test Power Supply

by Casemaker In reply to How to Test Power Supply

Hi,
The system is dead and will not boot. The fan does not spin at all and indicates to me it is dead. My question is related to testing the supply to see if it is dead. I swapped th PS with a known good supply and the system boots. But this still does not tell me if the system is dead or how to test it.
Thanks

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How to Test Power Supply

by xj0 In reply to How to Test Power Supply

The fan should be running , and on the power connectors to the disk drives,
it should be putting out around 12 volts dc between the yellow and black
wires and around 5 volts dc between the red and black wires.
If it's an ATX unit, it will appear dead until connected to a
motherboard and the power switch pressed. goto http://www.pcmech.com/powersup.htm for full details how to test it

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How to Test Power Supply

by Casemaker In reply to How to Test Power Supply
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How to Test Power Supply

by geroxx In reply to How to Test Power Supply

Mark

Well I have to agree with the above posting. It is the easiest way providing you have another P.S. you can use.

The best way to check a P.S. is with an O-scope as you will be able to see any AC ripple on the DC voltages. The ripple can cause real flackey problems sometimes.

What kind of P.S. is it? AT or ATX

AT P.S. Voltages (+/- 5% tolerance)
P8-1 Power_Good (+5v) Orange
P8-2 +5 Red
P8-3 +12 Yellow
P8-4 -12 Blue
P8-5 Ground Black
P8-6 Ground Black

P9-1 Ground Black
P9-2 Ground Black
P9-3 -5 White
P9-4 +5 Red
P9-5 +5 Red
P9-6 +5 Red

Drive/Peripheral Plugs
pin 1 +12 Yellow
Pin 2 Ground black
pin 3 Ground Black
pin 4 +5 Red

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How to Test Power Supply

by geroxx In reply to How to Test Power Supply

for and ATX P.S. Motherboard connector

Pin 1 3.3v (optional)
Pin 2 3.3v (optional)
Pin 3 Ground
Pin 4 +5
Pin 5 Ground
Pin 6 +5
Pin 7 Ground
Pin 8 Power_Good (+5)
Pin 9 5v_Standby
Pin 10 +12v
Pin 11 3.3v (optional)
Pin 12 -12v
Pin 13 Ground
Pin 14 Pwr_on
Pin 15 Ground
Pin 16 Ground
Pin 17 Ground
Pin 18 -5v
Pin 19 +5v
Pin 20 +5v

The Drive/peripheral cables are the same as the AT P.S.

I would suggest that you purchase a general PC TS book. I found that Scott Mueller's book Upgrading and Repairing PC's is pretty good.

HTH
Gary

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How to Test Power Supply

by Casemaker In reply to How to Test Power Supply
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How to Test Power Supply

by geroxx In reply to How to Test Power Supply

Mark

Well I have to agree with the above posting. It is the easiest way providing you have another P.S. you can use.

The best way to check a P.S. is with an O-scope as you will be able to see any AC ripple on the DC voltages. The ripple can cause real flackey problems sometimes.

What kind of P.S. is it? AT or ATX

AT P.S. Voltages (+/- 5% tolerance)
P8-1 Power_Good (+5v) Orange
P8-2 +5 Red
P8-3 +12 Yellow
P8-4 -12 Blue
P8-5 Ground Black
P8-6 Ground Black

P9-1 Ground Black
P9-2 Ground Black
P9-3 -5 White
P9-4 +5 Red
P9-5 +5 Red
P9-6 +5 Red

Drive/Peripheral Plugs
pin 1 +12 Yellow
Pin 2 Ground black
pin 3 Ground Black
pin 4 +5 Red

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How to Test Power Supply

by Casemaker In reply to How to Test Power Supply
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