Bad CPU? All New Parts

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phoenixcomputek7

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Jul 9, 2013
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Im trying to determine if I have a fried CPU. Customer brought the Gateway NE Series laptop in for repair. I start with the simple first replacing the DC Jack and testing the power adapter. I then replaced the power switch, and finally replaced the Motherboard and still no power, no LED lights at all completely power dead. So now I'm thinking they send a new mb and it's DOA, so I send it back and still same issues, no Powers, no lights . Now the final replacement part would be the CPU?, but I'm a little puzzled, I thought that even if the CPU were bad, you would have at least one LED power indicator on the MB light up, showing that the board is receiving power. I just don't think its the CPU, but what elce can I diagnosis to continue.

Thanks
 
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Eggz

Eggz

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Sep 3, 2013
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Oh, that's pretty fancy!

I am stumped too, then. Here are the things I can think of, but it's mainly to brainstorm with you, and I'm just following the power from the wall to the CPU. Sorry if some of it seems basic. I know you know your stuff, but it's just running through everything.

Wall plug
Wire from plug to power brick
Power brick
Wire from power brick to laptop
Tip of wire from power brick to laptop
Insert hole on laptop that accepts the wire tip
Soldered connection from insert hole to laptop's motherboard
Laptop's motherboard
Jumper settings on the motherboard
CPU socket on motherboard (and all associated pins)
CPU and all associated pins
Power button connection to the motherboard
Power button itself

That's all I can think of for a list to run through, process of elimination.

It almost certainly has to be one of those things, so ruling them out would likely leave the culprit (as you know). Good news is that you ruled some out already. Maddening, I know. I feel lucky I don't have to solve that myself. You're a better man than I. Good luck!!!

 
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Eggz

Eggz

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Sep 3, 2013
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Sorry, I can't say. It seems that finding proof that a CPU is dead is actually difficult. Here is something I found, but it really just says that it's hard to tell for certain whether the issue is a CPU or not.

http://forums.anandtech.com/showthread.php?t=2165441

The only other thing I could think of would be to put that CPU into another working laptop of the same model, but getting your hands on one of those might be hard. Short of that, I don't know.

Good luck!
 
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