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Motherboard taken out by eMachines Bestec power supply

Does anyone know exactly which components on the motherboard are blasted by the infamous eMachines/Bestec 250W power supply when it fails? Is there any hope of a component level repair for this motherboard? I repaired XT and AT motherboards a LONG time ago, way back when chips had pins that went all the way thru the board...

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  • frusto Jan 06, 2008

    Yes, but it didn't work. I actually have two identical eMachines T2862s, one of which didn't boot, the other *was* my only working desktop. I had tested the non-booting machines PSU by jumpering the power on pin to ground, and all voltages were normal, so I took a deep breath and connected it to my good machine, plugged it in, and...nothing. My formerly working mobo is now toast. After destroying it, I googled "bestec power supply fail emachines motherboard" and found that everyone knows that the Bestec 250W supply kills the mobo when it fails, to the point that some are contemplating a class action suit. Wish I'd thought of that before making the fatal connection. Thus, I was wondering if anyone out there knew what got scorched on the mobo. No visible or audible damage.

  • Anonymous Mar 14, 2008

    Same problem with power supply taking out M.B.. I have a few of these boards and just can't seem to locate the failed fuse if a fuseat all.

  • DUCKY711 May 23, 2008

    eMac T2862 mother board dead from PS failure. Has anyone found a easy fix? I am going to replace the PS and Mother board. Does anyone have suggestions on what mother board would be best (for $)?

    THANKS

  • Anonymous Jun 23, 2008

    What do you mean by "tested the non-booting machines PSU by jumpering the power on pin to ground"? Can you describe this method, because I have the same problem as you and I need to test the power supply.

  • mypoodlepals Jul 26, 2008

    I pushed the power button and nothing happens. Replaced the power supply same problem. What do i do now?

  • rahimsheikh Dec 16, 2008

    Bestec power supply not coming on, but comes on when I disconnect the mobo cable. Green light at back of power supply is flashing green 2 x per sec. When I groud the PSU (by connect green wire to black), the fan comes ona nd the green led is solid. No burn marks ont he mobo....Help!!!

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I have not identified the specific components on the motherboard that blow, but I can tell you the defect in the Bestec supply. The +5 VSB, which is the voltage that is on at all times, loses regulation and climbs to 8-11 volts. I believe this "higher than the required" +5V takes out the components on the motherboard involved with the computer/power supply "turn-on" circuitry. The "on" button on the eMachines front panel no longer turns the motherboard on because the "kept alive when the main power is off circuits" - which allow the on/off button to do its job of turning on the machine - no longer work.
Test your Bestec power supply by plugging it in the wall socket and have it not connected to anything. Read the voltage between the purple wire and any black wire. If you see +5.0V, then this wasn't your problem. If, like it did on mine, is closer to between 8, and 11 V, this is what took out the motherboard.

Posted on Oct 08, 2009

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To "test' the power supply; remove the 4-Pin power connector, and the 20-Pin ATX power connector. Jumper the Green Wire (power supply enable) to a Black Ground Wire (there are several to choose from, just pick one). The fan on the power supply should spin up, and you should be able to test the voltage outputs at that point.

Posted on Jul 04, 2008

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Im having the same problem...new power supply and no boot but motherboard liight comes on anyone find out what the problem is

Posted on Jan 15, 2008

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See my Hot Swap solution in title Power Green Light Flashing HP Desk Top PC m7250n

Posted on Sep 19, 2008

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Check it with another power supply, and assure it's propietary. Also check the capacitors on the motherboard, you may need to recapp them.

Posted on Jan 10, 2008

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Did u try new power did it work maby none

Posted on Jan 06, 2008

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  • nick helpap
    nick helpap Jan 06, 2008

    power switch in front bad try using a new switch maby wire in reset switch to the power on 2 pin on mobo test your switch on those k

  • nick helpap
    nick helpap Jan 06, 2008

    do u know what i meen reset switch stick it on the power on 2 pin unplug the 2 pin main switch thats in it to test see if yuor switch is bad

  • nick helpap
    nick helpap Jan 06, 2008

    also is your bios 3 pin cmos clear in the 1 and 2 pin not on 3 if its on 2 and 3 wont boot ok

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Fiend your solution direct from intel. Here is your solution........

Motherboard taken out by eMachines Bestec power su - bb03e0e.jpg

http://www.intel.com/motherboard/prob676ijt65/solution
109

Posted on Mar 13, 2009

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