Question about System Power Supplies

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E-Machine Computer Sir......... I can not get power to the rest of the system.. I check the power cord, I ran a check of 110 Volts into the cirucut board, good. I stopped there. Is there a fuse? circuit breaker?

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Re: E-Machine Computer

Can some one help me my screen went out on my computter thought it was the screen replaced it and still no power comeing to it....Thank you

Posted on Dec 26, 2007

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Re: E-Machine Computer

You need to test the large connector from the powersupply to the circuit board inside the computer. You should be reading small single volt numbers. More than likely its a bad powersupply though.

Posted on Oct 25, 2007

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My computer did not start when i tryied to turn it on, so i pushed the red butten to the side at my power suply and tryied again ther was a loud bang from the powersuply and ther was smoke comming out from...

The only thing to do at this point is to replace the Power Supply with a KNOWN to be good, compatible unit, and see if the rest of the computer hardware components are okay.

Going by your information stated that the Power Supply is an Enhance ENP-2224B SMPS, (Switched-Mode Power Supply), it is a special shape.

If it wasn't for the Slim Micro-ATX computer case you have, you could use an easy to obtain ATX form factor Power Supply.

From a quick search though it looks like a replacement unit is affordable,

There is simply no way to tell if the motherboard, and/or Processor, and/or Ram Memory, and/or Harddrive, etc., is okay without having power.
Unless you transfer the components on the motherboard to another working motherboard.

If your Power Supply has a rocker switch on the back that lets you use 120 volts, or 220 volts, make SURE it is set to the right voltage.

120 Volts
220 Volts
220 Volts
100 Volts ]

For additional questions please post in a Comment.

Jun 26, 2011 | Enhance Technology ENP-2224B, Enhance 240W...

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Most, if not all power supplies have a little switch at the back near where you plug the power cord into. It will say 110V right now, you can slide it to the 220v position. If you have already plugged the unit to the wall and tried to power up when it was in the 110v position it may be damaged, in which case you may need to buy a new one.
Regards, Chris

May 19, 2011 | Dell L375P00 (KH624) 375Watt Power Supply

2 Answers

Someone gave me an old Sylvania monitor (L15) Model no. PD-70FA but the 12V DC power cord is missing. It is not a standard type of powervcord and none of the stores I've been to (Staples, Office Depot,...

The power chord for this monitor is attached to a power adapter which converts mains voltage to 12 volts.
Check the power label on the monitor for the amp rating of the monitor and get an adapter that has an output of 12 volts and with the amp rating on the label or higher. Make sure the 0.3" power plug fits the monitor.

Feb 26, 2011 | System Power Supplies

1 Answer

How can you tell if a Dell power supply for a PowerEdge 2900 is good? Should the lights at least indicate when power is connected even with the PS is removed from the machine? How do you best determine if...

You cannot test the power supply on the bench just by connecting it to the mains power. You need to know which pins on the connector to activate the power supply and you need to connect a load to the power leads.
The best way to test the power supply is to leave the power unit connected to the computer power up the computer and test a spare 4 wire power connector with a multi-meter. Leave the other power leads connected to the various drivers.
If computer's power LED should light up then test the voltages.
The Red and black wire should read 5 volts.
The Yellow and black wire should read 12 volts.
If the power LED does not light up, check the mains lead in another appliance to see if the mains lead is OK.
If the mains lead is OK then most likely the switch mode power supply has died.

Dec 28, 2010 | Dell 930-Watt Power Supply

1 Answer

Yesterday I bought an STP-120 SIMA power inverter

you inverter was not fully charged because it requires a 110/220 v ac as specified in the manual; to charge it so it is impossible for the aircraft 15vdc to charge it

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Power supply suddenly 'dead'

You check the power supply using multimeter. but before everything make sure the you are getting power from the power outlet.

Here is how you can check the power supply with multimeter

If the wall outlet and the power cord are good, make sure the connection at the motherboard is secure. Then you may have to face the fact that the power supply itself is bad. If you have a multimeter, you can test the power supply output before purchasing a new one. Simply follow these steps:
  1. Turn off the PC, but do not unplug it. Open the system unit. Set the multimeter to read DC volts in the next range higher than 12 volts. Locate a power connector similar to the hard drive (or CD-ROM drive connector that is unused) and turn on the PC.
  2. You can also unplug a drive connector and use it. Turn on the PC and insert the BLACK probe into the power connector on one of the BLACK wires. Touch the RED probe to the YELLOW wire on the power connector.
  3. The multimeter reading should be +12 volts. Now touch the RED probe to the RED wire and the reading should be +5 volts. If no readings or different readings occurred, you’ll have to replace the power supply. If the readings were correct, you should check the P8 or P9 connectors at the motherboard. These connectors may also be named P4 and P5. To check these connectors, perform the following:
    • Insert the BLACK probe into P8 at one of the BLACK wires. Insert the RED probe into the P8 connector at the RED wire. The reading on the multimeter should be +5 volts.
    • Check the power going to the motherboard connections by inserting the RED probe into P8 at the YELLOW wire and you should get +12 volts. Leave the BLACK wire touching the BLACK wire at the P8 connector. Check the BLUE wire and the reading should be a -12 volts.
    • Now move the BLACK probe to the BLACK wire on the P9 connector. Test the WHITE wire by inserting the RED probe and the reading should be -5 volts. Check the RED wires on the P9 connector and you should get +5 volts on each red wire. You won’t get exactly 5 or 12 volts, but the readings will be very close, such as 5.02 volts.
    • If the Power Supply is a couple of volts off in either direction, such as when the RED wire should be reading -5 volts but it reads -8 volts, or if there are no readings, replace the power supply.

Mar 22, 2009 | System Power Supplies

1 Answer

How to assemble the computer

if u want assembled a new machine first of all attach motherboard with the cabinet as per the instruction after that

Jul 28, 2008 | Compaq Refurbished 280WATT POWER SUPPLY...

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