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EMachine T2958 - No power

EMachines T2958 at my house. It's my brother's. He may have taken a power surge last week. The unit was on a protector but I'm not sure if it was protection enough. Anyway, all plugged in, hit the power button in front, no lights, no camera, no action. There is no power switch on the back.

I have this now and he's asked me to try and fix it. I've had no experience with eMachines but from my reading they appear to be of inferior quality. My guess is I'm looking first at the PSU. I wonder if there are others out here with more experience with eMachines that would like to work along with me to see if we can get this thing restarted. I have some level of electronic skills.

Thanks.

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  • whftherb
    whftherb Nov 05, 2008

    Thanks - quick reply!!! Wow!



    OK, test PSU. I've been looking at those testers for around $20-$25.

    http://www.affordablesurplus.com/ps-powe... I might grab one because you never know when you might need it again.



    Is it your experience that they are worth it? I'm trying to think how these work i.e. leave the PSU in the case, undo the 24pin, and insert into tester. Then the power switch isn't in the circuit is it? Or is the PSU powered on because the tester simulates the power switch?



    H

  • whftherb
    whftherb Nov 12, 2008

    OK, I have the tester. See this: http://www.affordablesurplus.com/atx-pow... The documentation is nil - just some funky basic instructions on the unit and repeated on the little box it came in.



    Now more questions. If you have the 24-pin ATX connector inserted and the AC applied to the PSU, how does it get the necessary signal from the on/off switch? The PSU has no on/off switch of its own on the rear. When I plug in the tester and attach the 110V AC, I get nothing. No PSU fan, no lights on the tester, no sound from the tester - zero. It could be the sign of truly a dead PSU with no hope of going anywhere. I've stopped right there and not tested the HDD, SATA, floppy connectors etc.



    So with the tester in place - how do you tell the PSU to turn on (or attempt to turn on)???



    Thanks.

  • whftherb
    whftherb Nov 13, 2008

    OK, got it! Perfectly understood.



    Now just for my own info, if you have a moment, on these testers - the on/off connection-signal to the PSU through the ATX connector (I think they're the black and green wires) - is probably being genereated INSIDE the tester - IOW the two leads which are momentarily connected upon pressing the front panel power switch. Am I right?

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Yea that's right.Once the PSU has power the tester is powered on too.

Posted on Nov 13, 2008

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You are right about checking PSU first. Check PSU by using a PSU tester. If you don't have a PSU tester you can go to any computer reapir shop and have them check out the PSU for you.In case PSU, is fine there is a possibility that motherboard may be shot.

Posted on Nov 05, 2008

  • Sam Hagin
    Sam Hagin Nov 05, 2008

    They are worth buying if you have to constantly troubleshoot PCs. You test the PSU by inserting the 24pin connector into the connector of the tester then connect the PSU to a known good electrical source. Make sure the PSU is turn on (switch is one 1). PSU tester will show green lights if PSU is good, yellow or orange light if PSU is faulty, no light if PSU is completely dead.

  • Sam Hagin
    Sam Hagin Nov 13, 2008

    No lights or fan spinning indicates the PSU is completely dead and you need to replace it.

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1) Check THE receptacle in the surge protector the computer is plugged into.

I have found more than once that One bad receptacle in the surge protector is bad.

"Hmmm, surge protector power on light is lit." "Monitor has power, amp for the speakers has power, and the router has power."
All plugged in to the same surge protector.

Tried a table lamp into the receptacle the computer was plugged into, Nothing.
Replace surge protector.

2) Bypass the Soft Power On of the Power Supply, and see if the problem is the Power On switch, or the Power Supply.

If you bypass the Soft Power On of the Power Supply, and the Power Supply comes on, the problem is a bad Power On switch.

If you bypass the Soft Power On of the Power Supply, and the Power Supply does Not come on, the problem is the Power Supply.

If you wish to know how to perform this simple test, just state so in a Comment.
(Believe upper right of your page)

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eMachines doesn't give out this kind of info, and I don't have one in the shop.
eMachines also had the habit, of using a few different manufacturer's of motherboards. Intel, TriGem, MSI, Asus,and FIC to name five.

Plus eMachines would use whatever was available at THAT moment, when they were producing that particular model line. (Not stating the T2958 specifically. Whatever model line they were making at the time)

Plus at the time the T2958 was made, Gateway had bought out eMachines. (eMachines later bought themselves back)

However all is not lost here. At the time the T2958 was made the motherboards were manufactured by Intel.

The Intel D845GVSR
Uses the Intel D845GV MCH, and the Intel ICH4 southbridge chipset

(MCH. Memory Controller Hub. Intel's naming for their Northbridge chipset)

http://www.emachines.com/support/product_support.html?cat=Desktops&subcat=T%20Series&model=T2958

You are looking to see where the wires go, on the Front Panel header of the motherboard, from the Front Panel of your computer.

(Front Panel header on a motherboard, is essentially where the wires go that come from the Front Panel of the computer. When referring to a connector on a motherboard, a connector is a Header.

The Power On switch wires, HDD Activity Lamp, Reset switch, {If used}, and Power On Lamp, are located in the Front Panel, for your computer)

{Front Panel = 'Face'}

As stated, eMachines does not give out this info.
I just need your patience, and your eyes. I need you to compare a photo of a motherboard to yours.

When you open your computer case, the side cover should come off of the Left side.
The back of the computer will be to the Left, the front to the right.

The Processor will be at the top of the motherboard, and the Ram Memory slots will be to the right.

Observe the motherboard photo at the top of this page,

http://www.dexplor.com/phpBB2/viewtopic.php?f=13&t=7747553&sid=8fa7e78bbadfbd6fde083b28641248cc

Orient in your mind so that the motherboard in the photo will have the Processor to the top, and the Ram Memory slots to the right.

Should you have no idea of what I'm referring to here, please come back, and state so in a Comment.

The Front Panel header is composed of three individual headers, (Connectors) for this motherboard.

J9F2, J9G1, and J8H3

The J9F2 is for the USB ports used in the Front Panel. We won't be concerning ourselves with this header.

J8H3 is located to Right side of the CMOS battery. It has two pins sticking up.
This is where the Power On LED light plugs into, IF, the Power On LED light has Two wires, and the light is one solid color when lit up.

J9G1 is located below the CMOS battery, and is located on the bottom edge of the motherboard.

There are two rows of pins sticking up.
The rows are parallel to the edge of the motherboard.

The top row has 4 pins.
The bottom row next to the edge of the motherboard has 5 pins.

The pins are numbered from the Left, going to the Right. There MAY be a number 1, or 2, stamped on the motherboard.
I wouldn't count on it.

The top row of pins, going from the Left towards the Right are,
2, 4, 6, and 8.

The bottom row of pins going from the Left towards the Right are,
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There is no Pin 10.

1) Pins 1 and 3 are for the Harddrive Activity light. (HDD)
2) Pins 2 and 4 are used for a Power On LED also.
3) Pins 6 and 8 are for the Power On switch

Should you have more questions concerning this, please state so in a Comment.


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Hi hearalso, down to the basic's. Replace power cord.
No help there than, remove the case's side panel to expose the motherboard. (Normally it is the left side panel while facing the front of the PC.)
Look closely for a small (green in color) led light. The power cord must be connected to the PC & connected to you're power strip but do not press the power on button on the PC.
The green led tell's you the board is receiving 5volts. Check all connections. Un-plug & reconnect every data & power connector in your PC. (Double check). There is a fuse inside your power supply that may have blown. Check you're manual page, Approva Statements B-1. Fuse Warning Instruction Caution.
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