Dead laptop

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computergeek1

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I have a laptop in that is dead, it has been took apart so we are left with the motherboard, cpu and fan, it is still dead so has to be the motherboad.
My questions are how can you tell if the cpu is nacked, I now I can replace it but that wastes money if thats not the problem, is there a way to tell if it's bad.
My other reason why i think it to be the motherboard is the customer stated that one of the usb's does not work, so had a look and is very lose, so could this of caused a short and nackerd the motherboard.
 
Unfortunately, there's no way to check a CPU unless you have another known-good system that uses, or will accept, the same CPU. Even with a desktop, that's a bit of work to pull the good CPU, plunk in your suspect CPU, reapply thermal paste and the HSF, fire it up and see if it works or not. With laptops, it's even more difficult, and most tech shops don't have a bunch of known-good laptop motherboards laying around.

As replacement parts go, it's usually cheaper to buy a laptop CPU than a laptop motherboard, so you could build up a small stock of common laptop CPUs that you know are good. If the motherboard is bad, you do run the risk of frying your previously-good CPU, but usually it's either going to work or not. If it doesn't work with the known-good CPU and you've already eliminated everything else, then you are left with the conclusion that the motherboard is knackered.
 
Doctor Micro said:
Unfortunately, there's no way to check a CPU unless you have another known-good system that uses, or will accept, the same CPU. Even with a desktop, that's a bit of work to pull the good CPU, plunk in your suspect CPU, reapply thermal paste and the HSF, fire it up and see if it works or not. With laptops, it's even more difficult, and most tech shops don't have a bunch of known-good laptop motherboards laying around.

As replacement parts go, it's usually cheaper to buy a laptop CPU than a laptop motherboard, so you could build up a small stock of common laptop CPUs that you know are good. If the motherboard is bad, you do run the risk of frying your previously-good CPU, but usually it's either going to work or not. If it doesn't work with the known-good CPU and you've already eliminated everything else, then you are left with the conclusion that the motherboard is knackered.
Click to expand...

Cheers for that, how common are cpu failures.
What common Laptop cpu's are good to stock .
 
This is the cpu in question, it sits there on it's own, where is the best place to apply the paste, in the middle or on the cpu, reason i ask is because all tech have there own methods.




Photo001.jpgPhoto002.jpg
 
Last edited:
Hey!!!!! I asked a similar question about types of thermal compounds on CPUs without spreaders. Its relevant.

Re-read your other post about thermal paste computergeek1 the answer is there.
 
computergeek1 said:
Cheers for that, how common are cpu failures.
What common Laptop cpu's are good to stock .
Click to expand...

Motherboard failures are much more common.

For CPUs to stock for testing, go by socket type and pick one in the middle range, as those are most likely to work in most of the motherboards you encounter. All you're going to be using them for is to find out if the motherboard is knackered anyway. Check out Techarps Mobile CPU Comparison Guides Don't worry about the older CPUs, like AMD Socket 7 and Socket A. One or two Turions should do you nicely for the more recent laptops. For Intel boards, mobile celerons, and one or two of the T-series would be a good start.
 
You put it in the "middle", otherwise known as the die. It won't do you any good to put it anywhere because that is the only spot that will maintain contact with the heatsink.

Note: If any tech is putting it anywhere but the die on a processor like that; they are doing it wrong.
 
volatile said:
You put it in the "middle", otherwise known as the die. It won't do you any good to put it anywhere because that is the only spot that will maintain contact with the heatsink.

Note: If any tech is putting it anywhere but the die on a processor like that; they are doing it wrong.
Click to expand...


This processor just sits there on its own, if you look at the picture that i posted, that is how it sits, the fan is next to the processer and the heatsink next to the fan, this is a old laptop, build around 2001.
 
Doctor Micro said:
Motherboard failures are much more common.

For CPUs to stock for testing, go by socket type and pick one in the middle range, as those are most likely to work in most of the motherboards you encounter. All you're going to be using them for is to find out if the motherboard is knackered anyway. Check out Techarps Mobile CPU Comparison Guides Don't worry about the older CPUs, like AMD Socket 7 and Socket A. One or two Turions should do you nicely for the more recent laptops. For Intel boards, mobile celerons, and one or two of the T-series would be a good start.
Click to expand...

WHAT ABOUT THIS ONE CHEAP AND NEW
http://cgi.ebay.co.uk/Intel-Celeron...CPUs?hash=item3ca44da4f4&_trksid=p3286.c0.m14
 
computergeek1 said:
This processor just sits there on its own, if you look at the picture that i posted, that is how it sits, the fan is next to the processer and the heatsink next to the fan, this is a old laptop, build around 2001.
Click to expand...

I am not saying anything about that. You were asking where to put the thermal paste. I'm saying the thermal paste should only cover the middle portion of the processor which is raised from the rest of the silicon. Usually, there is some sort of heat pipe, if that should make contact with the die and transfer the heat to the heat sink or fan.
 
volatile said:
I am not saying anything about that. You were asking where to put the thermal paste. I'm saying the thermal paste should only cover the middle portion of the processor which is raised from the rest of the silicon. Usually, there is some sort of heat pipe, if that should make contact with the die and transfer the heat to the heat sink or fan.
Click to expand...


On this one there is no heatpipe, mite be because its old, The processor is own its own, first time i had seen that because i don't deal with many old laptops, and then the fan and heatsink are in one unit, as you can see from the picture the thermal paste needs adding again.
 
computergeek1 said:
On this one there is no heatpipe, mite be because its old, The processor is own its own, first time i had seen that because i don't deal with many old laptops, and then the fan and heatsink are in one unit, as you can see from the picture the thermal paste needs adding again.
Click to expand...

I guess I don't know what you are trying to say. The picture just shows a processor and you asked where the thermal paste should go and I said the middle part only...none of the green part. I don't know how much more layman I can get. But, you keep telling me that the heatsink/fan sits on it's own and has no contact with the processor. So why would you need to put on thermal paste if there is going to be nothing in contact with the "middle"?
 
The motherboard come today for this laptop, so I swap then and then connected just the cpu and the fan, still dead, do u guys think it could be the cpu or the fan now.
 
Is it just me or are we two pages into this and we still do not know the make, model, cpu, etc of this machine ?
 
computergeek1 said:
The motherboard come today for this laptop, so I swap then and then connected just the cpu and the fan, still dead, do u guys think it could be the cpu or the fan now.
Click to expand...

Just to be sure, you did check the AC adapter for correct voltage. Also when you say it's dead, is it that the fan is not spinning or that you get no beeps or any lights where there should be some?
 
NYJimbo said:
Just to be sure, you did check the AC adapter for correct voltage. Also when you say it's dead, is it that the fan is not spinning or that you get no beeps or any lights where there should be some?
Click to expand...

The motherboard is dead, no fans spinning, no beeps, no lights, nothing. The power pack is 19v and checked that on the meter is is saying 19v, so power pack is fine, i thought it might of been the motherboard, all the signs were there to be the motherboard so got a another one, and it is still dead so we are left with the CPU or fan.
 
NYJimbo i just disconnected one of the boards from the motherboard, it powered up, fan spinning, no beeps , no lights then shut down, now it is dead.
 
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