Long Term Fate of Relatively Hot PCH

[caspian]

Dear Forum members,

I have got a generic question.
Sometime in some Laptops, I see some PCH chip that operates with a temperature between 70'C and 80'C because of weak heat sink. but never gets above 80'C.
If I leave such a PCH chip to work in that condition with a regular laptop usage, what will happen to that PCH chip in long term?
Does this temperature damage the chip?

I have read datasheet of a few PCH models. it was mentioned there that the maximum operating temperature of PCH is about 105'C. But this temperature may be tolerated only for a short period.

thanks

[jasko_jacker]

Re: Long Term Fate of Relatively Hot PCH

From my experience, and from my research, I think we must distinguish two cases:
1 the pch that is in the same chip as the CPU
2 the single pch with or without heat sink
In the first case the heat comes from two separate sources, from the cpu (on some cards the heat sink does not include the pch to avoid this problem) and the heat produced by the flow of the current.
In the second case the heat is generated only from its operation
and to a lesser extent from the temperature of the motherboard.

How much temperature can it withstand and for how long?
It is not easy to answer but I think there is also a problem
of obsolescence programmed in the sense that perhaps the producer
does not use all the technology available to make it work
*as long as possible. I have soldered a very used pch (CM236 with many reballing and wrong solder temperature profile) and after
seven months it works very well. For this reason , I think there is no correspondence between external heat and its damage.
I think it's a matter of luck, it heats up because of a wrong motherboard design and is therefore more prone to internal failures.
I think the cause is always an excess of current (which raises the temperature) and not the temperature itself.

[caspian]

Re: Long Term Fate of Relatively Hot PCH

Thanks,
The PCH chips which I observed were separate from CPU on 6-8 years-old laptops. Probably, those chips may be getting defective and get hotter than expected. But they still work. The temperature is generated by PCH itself.
Now assume we have a new healthy PCH chip, that has no defect. but its heatsink is weak. how many years can it work under a regular laptop usage while PCH temperature be between 70'C and 80'C every time we turn the laptop on?
Any experience please?

[mcplslg123]

Re: Long Term Fate of Relatively Hot PCH

If the pch is really new, it should last atleast 3 years for HM70 Onwards chip. However, i see Older PCH like hm55 lasting longer.