over heating issues after motherboard replacment

[scrambler400]

Hello,

i have a 15-P393NR. i recently replaced the motherboard with this part 826947-601 - MBD UMA A10-7300 which is what hp calls for and is the same as the mbd that was in it. I have gone through several mbd, heatsinks and fans. The mbd still over heats. It will be fine at first then all of a sudden it's like the fan goes into turbo mode and starts to spin out of control this usually takes about 40-60 seconds after turning the unit on. Does anyone know if these mbd have a known problem with over heating or am i using the wrong thermal paste. The paste i am using is shin-Etsu-MicroSI. I have used this paste on everything i have ever done and have never had this issue.  It's to the point i am ready to pull my hair out because i don't know why it's doing it. this is the second time. The first time i went through about 7 motherboards before i told the customer there was nothing i could do for them.This is also the unit i went through about 3 heat sinks and 4 fans. Now i have another one with the same problem and i would lke to know why this is doing it. I find it hard to believe it's all bad motherboads and other then over heating they work fine. Any help would be appreciated.

Thank you,

Ben

[mdklassen]

> this usually takes about 40-60 seconds after turning the unit on.

Yikes!  That is far too quick.

Can you touch the heat-sink (not the fan!) after booting it, to see how fast the temperature rises?

Is the heat-sink actually touching the CPU (through the heat-paste) ?

Is the CPU-fan actually working?  (It must be, when it starts to "roar")

Dead fan inside the power-supply not helping move the heated air?

Blocked air-intake vents?  Blocked exhaust vents?

Computer placed too close to solid walls, so that the exhausted air cannot go anywhere?

[mdklassen]

Did you use the same CPU (not an identical CPU) in each of the 7 motherboards?

P.S. How in heck does overheating wreck a heat-sink? 

After all, they are metal, not plastic, and they are designed to be "heat-tolerant".

You can (carefully) drop a heat-sink into a pot of boiling water (100 Celsius) without hurting it -- just don't reach in, and try to remove it!  Your CPU (and heat-sink) should never get as hot as that water.

[scrambler400]

New fan new heat sink new paste new mbd after about 30-60 seconds the CPU gets to hot to touch even picking up the heat sink will burn ya. I'm at a lost my assumption is bad mbd in these models.

[scrambler400]

Same part number orderd. I may try to find an alternative mbd that would be equal or better to put in. I'm assuming the CPU is the same as the part numbers were the same

[mdklassen]

Edit to the following ...

I checked: http://www8.hp.com/h20195/v2/GetPDF.aspx/c04853117.pdf

and my guess that it is a "desktop" is incorrect.

So, the following two pictures are NOT relevant, but still slightly interesting.

The specifications say "AMD quad-core".

Do you have any other fans (back-side of case):

or a "high-performance" heat-sink:

Not shown is a "X-shaped" bracket that has 4 posts and screws to connect down to the motherboard.

It centers on that "hump" in the middle.

Have you been moving the CPU from one motherboard to the next, or changing CPUs each time?

I'm guessing a defective CPU.

Is there a BIOS-update for the motherboard, to properly recognize the CPU, and to supply the correct voltage (not enough to "cook" it)?

Defective power-supply, giving out the "wrong" voltage/amperage?

Is there a 4-wire connector power-lead that should connect to the motherboard, near the CPU?

[scrambler400]

no this is a laptop.  Here are the cpu specs from cpu world. http://www.cpu-world.com/CPUs/Bulldozer/AMD-A10-Series%20A10-7300.html.

there is also another chip on the mbd which is an amd graphic chipset  number on the chip is 218-0844012

this morning i pulled the rtc battery out for about 30 minutes.  to see what this does. i will update in a few hours with what i did and let you guys know. i just find it hard to beleave that every mbd is doing the same thing new and used. i wish i could put a video up here. 

[scrambler400]

ok update:

i took rtc battery out for 30 minutes but mbd in hit power button 4x. i covered the heat sink in a coating of thermo just to be sure none of the heat sink was touching anything (just an idea as i'm out of them) unit was turned on and bios stated it was reset  after about 30 sec cpu was becoming hot after about 60 sec it became almost to hot to touch which then led to the unit powering off due to heat. at this point im thinking i am going to call hp as i am out of idea and want to get there input on it.

[scrambler400]

i spoke with hp and they were NO HELP they wanted 60 bucks to talk about the mbd.  i am going to order another brand of thermo and see where that leads me.  if that don' work then im going to chulk it up to bad mbd 

[mdklassen]

>  i wish i could put a video up here. 

It is possible.

At the top of this "reply" window are icons:

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> after about 30 sec CPU was becoming hot after about 60 sec it became almost to hot to touch.

I want to be very clear about this.

Are you really touching the CPU itself, or are you touching the copper "heat-pipe" that should be sitting on top of the heat-paste, which itself is on top of the CPU?

The copper should be conducting the heat to the "radiator", and the fan should be moving air through the radiator, and the warm air out through the exhaust vent.  So, it is "reasonable" that the "rectangle" (see the picture) itself will be hot, as the heat is being transferred to the radiator.

[Sometimes, it takes a while for a "moderator" to "approve" that the picture be visible.]