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Installed New Power Supply but no full power


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#1 novaklone

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Posted 01 October 2010 - 11:42 PM

So a lightning strike causes my computer to not turn on and I immediately realise its an issue with the power supply.
I replace the power supply to my Dell Dimension 4600 desktop. Now when I press the button the only things that turn on are the PSU Fan, CPU Fan, and my CD drive Light. I tripled checked to make sure all cables and pins are connected to the motherboard and googling the issue didn't help much... How can I restore full power to my PC?

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#2 MrBruce1959

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Posted 02 October 2010 - 12:12 AM

There may be a strong possibility that your motherboard has suffered some damage as well from this lightening strike.

My reasons for saying this includes the possibility that your motherboard may have sustained damage from your connection to the Internet as well.

Since we do not know how this lightening strike made its way to your computer in the first place, it is hard to determine what may have sustained the most damage, the PSU or your Ethernet NIC or your modem.

Bruce.
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#3 novaklone

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Posted 02 October 2010 - 02:50 PM

Well the strike also destroyed my wireless router which doesn't work any more. I plug that that thing in and only 2 lights come on. So... I don't even know what to ask any more.... shouldn't the motherboard be fine since the fans work? and since the router doesn't work could it be the NIC card?

#4 MrBruce1959

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Posted 02 October 2010 - 05:00 PM

Your fans are working because they are being powered by the power supply, which you said you replaced.

There is a circuit which is on the motherboard that the power button on the computer case activates to send a signal to the power supply, that activates the cooling fans, this circuit allows 12 Volts from the power supply to power up the cooling fans.

There are voltage sensitive components located through out the motherboard, that have an association with earth ground and chassis ground. It is through this circuit that electronic parts can be damaged from a high voltage such as lightening.

Parts such as diodes, integrated circuit chips (IC chips), electrolytic capacitors, voltage regulators and transistors can be damaged if voltage higher than their rating passes through them, thus burning open the circuits built into them.

If your Ethernet NIC is built into the motherboard and has sustained damage, your whole motherboard would have to be replaced. If even in the event, you were able to replace the chip, the chances are very good there are other components on the motherboard which have also sustained damage as well.

To diagnose your motherboard for failure, you would need the proper test equipment along with flow charts and circuit voltage charts to do a successful analysis, then have the ability of replacing surface mount components, which require the use of soldering tools used for micro circuitry repair. The use of a microscope or electron microscope is needed in some cases.

This is why todays electronics are known as disposable devices. The cost of repair far exceeds the price of a new one.

Bruce.
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#5 Layback Bear

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Posted 03 October 2010 - 05:47 AM

I have never known of a computer hit by lighting to live. Once a few parts have been replaced to get it to work in a short time it dies again. Check with your insurance company and see if a full replacement is covered.

#6 novaklone

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Posted 04 October 2010 - 07:02 PM

no insurance. ill just have to replace the board.... off to amazon i go. Thanks for the input.




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