"New" dead CPU.

[Emanuel.macina]

We all know about the fact that a CPU Chip can die. We all know few scenarios that could bring it to it's death. But how do you identify exactly what's wrong with one?

Like, was it overclocked and got fried? Was it droppedon the ground? 

What symptoms could present and is there any way to revive one?

[Princess Luna]

Considering when a CPU does die there is no fixing it any ways, knowing the exact cause is rather meaningless aside satisfying curiosity.

[rcmaehl]

You can verify a dead CPU by testing it in multiple motherboards and that's about it. Unfortunately, I'm unaware of any way to determine the cause of death of a CPU without tools worth several hundred dollars... unless it's obvious like the top is ripped off or huge scratches of course.

[Turtle Rig]

Also could be a bent pin, let me add that lol

[BobVonBob]

If it didn't work right away, you're basically SOL on repairs, not even Intel or AMD could revive a chip that's died, unless it was an old chip that had pins on the chip itself and they were bent or missing, then a repair might be possible with steady hands.

 

This being said, if it was fried from an overclock, unless it was really fried, you won't see any signs. If it was dropped you'll probably see a dent on the substrate. If it was anything else, you probably won't see anything, except if a surface mount component was missing, but some are missing intentionally, so you would need to compare with a working one to tell.

Edited January 21, 2019 by BobVonBob
Oh hey, Ryzen has pins too

[Emanuel.macina]

I'm kinda a novice when it comes to dead cpu's. 

For example, when you put one into a motherboard, a dead CPU would start heating, as you start it? 

 

Edited January 21, 2019 by Emanuel.macina

[BobVonBob]

1 minute ago, Emanuel.macina said:

I'm kinda a novice when it comes to dead cpu's. 

For example, when you put one into a motherboard, a dead CPU would start heatingas you start it? 

 

Yes, a dead chip will likely still be receiving power, just not doing the right things with that power. It will still heat up.

[Emanuel.macina]

4 minutes ago, Turtle Rig said:

Also could be a bent pin, let me add that lol

On lga1151 the only pins that could bend, are the ones inside the motherboard's soket

 

[Emanuel.macina]

Just now, BobVonBob said:

Yes, a dead chip will likely still be receiving power, just not doing the right things with that power. It will still heat up.

Right. 

I've got an I5 6400 that keeps rebooting but I'd does in a weird manner. 

I mean that: usually you expect to do it every few seconds, or you expect to reproduce the same effect every time you power it on.

When I do power it on, the by first it starts, everything spins alright but no post, no beeps, nothing for maybe one minute or less. And after it starts rebooting continuously 

[BobVonBob]

2 minutes ago, Emanuel.macina said:

Right. 

I've got an I5 6400 that keeps rebooting but I'd does in a weird manner. 

I mean that: usually you expect to do it every few seconds, or you expect to reproduce the same effect every time you power it on.

When I do power it on, the by first it starts, everything spins alright but no post, no beeps, nothing for maybe one minute or less. And after it starts rebooting continuously 

Dead chips are unpredictable, but unless you also have a known good chip to test the motherboard don't rule out the possibility of it being the faulty piece of the system.

[Brooksie359]

When I see a system that is not posting or boot looping the cpu is about the last thing I consider when trying to find the cause. Ram is a huge one that is often a culprit when a system fails to start and is boot looping. 

[Emanuel.macina]

20 minutes ago, Brooksie359 said:

When I see a system that is not posting or boot looping the cpu is about the last thing I consider when trying to find the cause. Ram is a huge one that is often a culprit when a system fails to start and is boot looping. 

I have another CPU for testing. The RAM modules are alright. The motherboard it's alright. 

The CPU it's faulty. However I'll buy another one soon and that should be alright.

[Emanuel.macina]

Just now, Emanuel.macina said:

I have another CPU for testing. The RAM modules are alright. The motherboard it's alright. 

The CPU it's faulty. However I'll buy another one soon and that should be alright.

My point it was that the system has a weird behaviour for a non functional CPU. 

[Brooksie359]

1 hour ago, Emanuel.macina said:

I have another CPU for testing. The RAM modules are alright. The motherboard it's alright. 

The CPU it's faulty. However I'll buy another one soon and that should be alright.

If a cpu has a particularly bad mcu it can have a hard time with higher clocked memory. You should also see if resetting the bios fixes the issue as that is another thing that can cause this issue. I mean it could even be something as simple as an incompatible motherboard. 

[Emanuel.macina]

16 minutes ago, Brooksie359 said:

If a cpu has a particularly bad mcu it can have a hard time with higher clocked memory. You should also see if resetting the bios fixes the issue as that is another thing that can cause this issue. I mean it could even be something as simple as an incompatible motherboard. 

I've done the cmos reset and nothing changed.

[Brooksie359]

2 minutes ago, Emanuel.macina said:

I've done the cmos reset and nothing changed.

What cpu did you test with that worked?

[Emanuel.macina]

1 hour ago, Brooksie359 said:

What cpu did you test with that worked?

It is Celeron g3900. I only bought it for testing 1151 motherboards. That one posts just fine.

[Emanuel.macina]

Just now, Emanuel.macina said:

It is Celeron g3900. I only bought it for testing 1151 motherboards. That one posts just fine.

And the motherboard its a gigabyte ga-z270p-d3