I have asus a42j(MB ver:k42jp),I received this laptop 1 month ago while sometimes did not boot up and fan works in high speed ,I resolded gpu chipset(ATI 216-0772003) but trouble did not solve,so I reballed gpu and solved trouble and laptop worked about 10 days normally without any problem,after 10 days the toruble appeared again and reballing did not solve problem so I changed gpu chipset with new one,trouble solved and laptop worked about 1 month and now again I have the same trouble,I resold gpu and now system did not boot up at all,I hope gpu chipset is intact..i need Thoughts …..
Bios is true.
Voltages on gpu (ATI 216-0772003)- 1.08v ,1.5v , 1.8v.

One of possible reasons of high speed Fan is a BIOS. Next- PCH, next - GPU.

I am sure the bios is true.

if you sure next check

this model pch is BD82HM55,Did you mean would change it for cheking of pch?thanks for supports..

yes,but before try my bios
I sent it to your л.с.

Hi,thanks for your support,system has no change with new bios,Seems that i have to change bd82hm55..

did you change the cpu?
did you see the oscilloscope at the bus lpc?

Hi,yes i changed the cpu.
There are communication and data livery between bios and i/o controller(it8570e),this is only one i saw on oscilloscope.
How can i see and test the lpc bus on oscilloscope?which signals i have to see on oscilloscope and how they would be?
(frame-reset-clock or address/data).i think i can see this signals on i/o pins,am i right?
Thanks for your good support..

when you m\b is working you can see active wave like the adress bus on the memory kbc
you must see it at the adress bus lpc (lad0-lad3)
and lpc frame you must see wave 33rHz
if you see active at the lpc I recommend to you soldering the postcard .
sorry for my bad English/

Thanks,What did you mean of soldering postcard?

I mean that
solder a post card to the bus LPC
like this
http://dx.com/p/3-in-1-mini-pci-e-mini-pci-lpc-2-digit-analyzer-tester-post-card-for-laptop-115004

I used qiguan post card(ver-B) but i think it is not compatible with asus laptops,by the way i have RST light always on,and i check any 7 signals on lpc bus but i did not see any activity on them,that only one signal is RST light olways on(it has 3.3v).
I think system could not start because RST is active all the time,is that true?

no,reset must be 3v after it it will be 1,5-2,5v miliseconds and after it 3v/
look this screen

Is this time sequence global on any systems?

waiting for any help??

for asus - yes!