Question about Intel D845GVSR Motherboard
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...
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
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
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
See my Hot Swap solution in title Power Green Light Flashing HP Desk Top PC m7250n
Posted on Sep 19, 2008
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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Posted on Jan 02, 2017
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