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Have I blown my CPU??

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9 replies

by graham1.westwood

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A few months ago, I was working with my laptop, and carelessly placed the power plug into the USB port, the system instantly stopped working.

After many reboots and people looking at it, we pronounced it dead. Then one day, I was about to throw it out, and I thought I would try one more time, and it worked.

Now, sadly, I am back to square one, nothing working.
Can anyone suggest what I can do. The system will not even load the BIOS splash screen!

Any comments gratefully received!

Rgds
Graham

9 replies

by ken

Well.... not much to lose now. If by chance you can get into the bios again try disabling the USB ports if it allows you to. You might be able to flash the bios which might repair the problem.
Most likely though it is dead. The only holpfull part is that it worked a few times.
You might find another main board on ebay. Maybe some broke their screen but has a good base or something.

by graham1.westwood

I have thought about a BIOS flash, but cannot get the system to boot this far!

May try a new laptop!

by thechas

Odds are that you backfed a high voltage into the 5 volt power supply in the laptop.

The regulator output transistors and any related filter capacitors have been over-stressed.

It worked a little after setting for a period of time because the parts are walking wounded.

Th problem is that until the power supply circuits are rebuilt, there is no way to know if there is any damage to the CPU or other components.

How to proceed depends on the age of the laptop, and how much you are willing to invest in repairs.

If the internal power supply is a separate module, it would be worth having it changed.

If the internal supply is part of the mainboard, then, changing out the mainboard should fix everything.

Chas

by graham1.westwood

Chas,

I agree with you here, I do think that it was just coincidence that it started to work.

The laptop is 2.5 years old, and can buy a new decent-ish spec for 400. Think I may do this!

Thanks again
Graham

by willcomp

Try removing battery for a few minutes just for drill. You may have a capacitor that is not fully discharging due to damage from voltage backfeed. Removing battery could allow cap to discharge.

by graham1.westwood

I have tried to power on with no batt, with only batt, and batt + power and nothing seems to make this bootable!

Graham

by oh smeg

If the unit is not worth repairing or whatever you can pull the HDD and fit it to a USB Enclosure and use it as a Backup Device.

That way you wouldn't be in a position of loosing all your Data which when everything is said and done is the most valuable bit of any computer. You may even be able to recover your Data as well using the USB Caddy.

Just something to think about.

Col

by graham1.westwood

Smeg,

I have already conciddered this, and am lining up a caddy with my potential order for the laptop!

Graham

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