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Emachines T2893 , will not power on, there is a small green light on inside on a board.

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Suggestion is to bypass the Power On switch, to see if the problem is the Power On switch, or a bad Power Supply.

If upon bypassing the Power On switch, results in the Power Supply coming on, the problem is a bad Power On switch.

If bypassing the Power on switch results in the Power Supply does Not come on, the problem is a bad Power Supply.

I would like to refer you to a previous problem, that I just gave a solution to concerning this,

http://www.fixya.com/support/t4915632-compaq_presario_sr1620nx_desktop_turn


Posted on May 31, 2010

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I have a T2893 model that is probably 10 years old. The hard drive just quit on me and I cannot boot back up. It appears completely dead. I changed power plugs to ensure that it was not the power supply. I...


1) Install the harddrive as a slave drive in a known working computer.

2) Install the harddrive into an economical external harddrive enclosure, and plug the USB cable of the enclosure into a known working computer.
[IMHO the better of the two options]

The eMachines T2893 uses an IDE harddrive, (IDE is also referred to as PATA)
This is an example of an IDE external enclosure,

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=1337265&CatId=2779

As for the T2893 it could be a bad power supply, and worst case scenario, a bad motherboard also.

Granted the power supply may seem to be working, (Bestec 250 Watt), but it may have a weak voltage power rail.

Enough power to light lights, and maybe spin fans, but not enough for the Processor.
1) ALL the lights use less than 1 Watt of power
2) EACH fan uses 2 to 3 Watts
3) A typical Processor can use 51 to a 125 Watts.

The T2893 comes with an Intel Celeron D 330.

http://en.wikipedia.org/wiki/List_of_intel_celeron_microprocessors#.22Prescott-256.22_.2890_nm.29

The Celeron D 330 can use up to 84 Watts. (Under the heading TDP in the chart )

In essence the harddrive may not be bad.

When you press the Power On button, you are closing a circuit that feeds 5 Volts to the Power Supply. Soft Power On function.

[Brought in, to replace the old style of pressing the plastic Power On button, which in turn presses against a steel rod, which in turn presses against a Power On switch, attached directly to the Power Supply ]

Power goes to the motherboard. The first chipset to receive power, and to initialize is the BIOS chip.
[Chip and Chipset are slang terms to represent I.C. Integrated Circuit]

Bios looks to see what devices are installed, does a Ram Memory count, turns the Processor on, and hands the computer over to the Operating System.
[Windows XP is an example of an O/S]

The operating system is located on the harddrive.
You don't have enough power to turn the Processor on, so there is nothing to process information.
Nothing to find the operating system.

Two of the major faults reported for the T2893, are the Bestec 250 Watt PSU, (Power Supply Unit), and the motherboard.
The primary failure is the Power Supply. When the power supply fails, it has a nasty tendency to take the motherboard with it.

What actions to take, to possibly solve the problem with the T2893, provided the harddrive works?
Suggestions:

1) Test the Power Supply. See if the voltages are correct, and specifically the 12 Volt power.
There are three main voltages.
A) Yellow insulated wires are 12 Volts
B) Red wires are 5 volts
C) Orange wires are 3.3 Volts

ANY Black wire is a Ground wire.

Do you have a multimeter? An economical multimeter can be purchased for around $10 to $12.
(Many stores carry them. An auto parts store is one place)

There is also a power supply tester. Economical versions are around $20.
The 12 Volt power can be 11 to 13 Volts. Anything below 11 Volts, and it's time for a new power supply.

Power supply diagnoses to be good, check the motherboard. Visually look for bad Electrolytic Capacitors.
eMachines are known for using cheap quality Electrolytic Capacitors.
Saves the computer manufacturer money, which they use to sell budget priced computers. (All eMachines are budget computers)

http://www.capacitorlab.com/visible-failures/index.htm

If the motherboard is bad, I have seen replacements offered online.
One motherboard offered had the price of $90.

Now you could be looking at $30 to $50 for a decent replacement Power Supply, and another $90 for a motherboard.
Believe it would be best served to purchase another computer, IMHO.

Have any questions concerning this, please post in a Comment.

Apr 20, 2010 | E-Machines eMachines Desktop PC

1 Answer

Does the T2893 have to have an ATX power supply specifically for the emachine? I tried to upgrade to logisys 480w supply and the fans and a few lights come on, but the unit won't boot up.


there are TWO different power cables on the new machines. (not just two parts to the ATX)

one is the ATX like you are used to.

The other is a small four-prong plug (coming off of the power supply - look for yellow and black wires) find the matching receptacle on the motherboard.

good luck

Oct 20, 2009 | E-Machines T2893 PC Desktop

1 Answer

T2893 desktop did not power on when I hit the power button the green light is on the motherboard change power supply


E-Machines are notorious.....I had the same trouble with my T3624, replaced the MB and alls' well. The green light just shows the power is connected.

Oct 14, 2009 | E-Machines T2893 PC Desktop

2 Answers

No boot, New PS, Green light on MB lights, No Fans running


Bottom line: Either your power supply or (hopefully not) the mother board has gone bad.
Replace power supply (remove old one), take to local independent computer shop, ask them for new unit. Should be around $50.00. - no more. After reinstall, if still no fans, boot, etc. Replace motherboard or buy a new machine. MB's installed probably will run you around $250.00-ish.
Good luck.

gurutim

Mar 21, 2009 | E-Machines eMachines Desktop PC

3 Answers

T2893 desktop did not power on when I hit the power button


If you can find someone that has the same model, that is the best way to make sure it fits. Some other motherboards will fit, but you may have to do some work to get them to fit. The best way would be to try to do some research on your particular motherboard (mobo) on the internet. Sometimes it will have a manufacture’s name and model on it, try googling it and see what type it says it is (ATX, mini-ATX, AT, etc). One problem you may have is the power button connectors may not be compatible with your new motherboard if you get something besides an emachine mobo. If you are good at electronics it will not be much of a problem for you.

Unless you get an exact e-machines mobo, your OS will most likely not work at startup. Windows XP does not like wholesale changes like a mobo. When it sees that a major configuration change has happened it sometimes freaks out. Sometimes it will just ask you to re-activate windows other times it gets stuck in a reboot loop. Hard rive and CD rom should still work, provide you do not get too new of a mobo. Older HDD and CD drives were IDE connectors, newer ones have SATA connectors. Unless your mobo and power supply unit (PSU) have the correct connectors you will not be able to use them.

To the poster who asked if it could be anything else besides bad mobo. Yes it can occasionally be a bad power supply unit (PSU). A bad PSU does not necessarily mean no power, just not enough power to run the computer. You can try swapping it out with another one of equal or greater output watts. You can try removing the power connectors from the drives and then remove the memory and see if it changes the boot up procedure of your machine. More beeps, different beeps, no beeps, etc. Add one component back at a time to test. Make sure you get the same results and not just a one-time fluke start up. If a memory stick is bad, it usually is bad. A power supply or mobo can be flaky and fail some times and not others.

Jan 25, 2009 | E-Machines eMachines T3830 PC Desktop

1 Answer

T2893 e machines wont turn on


It sould be as simple as the on/off switch being bad .. the power supply could be bad .. it is powering the 'led' enough but it is faulty and cannot power the machine.

Try disconnecting all the components .. cd, hard drives, floppy ,etc .. but leave the power plugs on the motherboard .. try ...see if the CPU fan or power supply fan spin up..

Jan 04, 2009 | E-Machines T2893 PC Desktop

1 Answer

Will not power on


Hi,
This is a tricky problem. You would be thinking that if green light comes then everything is working fine. But that doesn't satisfy the system. Make the ATX power connector of SMPS(Single Mode Power Supply) is properly plugged in or not. The glowing of green light because of the small power connector (4-pin square connector) beside the processor fan. There is one more power connector i.e., ATX power connector. i guess its 20 pin. plug in properly and then try. If again the same problem occurs then you need to replace the SMPS itself.
Thank you........

Sep 28, 2008 | E-Machines eMachines Refurbished EMA...

1 Answer

Reconnecting power swith, LED light for power and hard drives on emachine


yes that is true if you look at your wires ahnd you will see that one says hdd and one says spkr and so on now look closley at the board and you will see the same thing on the moboard if you are not abloe to read it you should be able to go to the manufacture of the board and there is a section for online manuals that u can download ok i hope this helps out a little bit please keep me posted ok this i can help you out morte if you need ok best reggards mike

Sep 05, 2008 | E-Machines eMachines Desktop PC

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