no display the cpu core does not come on .all voltage ok 3.3v 5v 1.8v,1.05v all okay changed clock and cpu core chip max8736a.no shorts in mosfets driver for cpu high side and low side.what could be the problem .

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repairs of laptops and selling of components

Normally southbridge turns on CPU power. So that can be not fully initialisation by many reasons...
Which southbridge is there? Write platform please

the sb is nh82801gbm.one signal which i dont understand is the imvp_ok should go low when all is well but does not happen.thats why the clock does not function the 14mhz has no osc at all nothing on the scope.
sb nh82801gbm
nb qg82945gm
power is tps51120
max8743a
max8736a cpu core

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repairs of laptops and selling of components

And what is a platform? Please look on labels on mainboard...

Aslo look at powergood (PWGD) maybe that can help... And recheck about RST signal on KBC, iif it's lo you can try to disconnect reset pin of KBC from other to detect which one SB or KBC pulls it down

i am going crazy with this stupid laptop i changed the sb still same problem i found out the the vgate(vrmpwrgd) is low .i have changed so many chips like clock gen all power ics max8743 tps51120 apl for .90v and 1.05v .also changed the cpu core ic again and logic gates llike 74hc08 etc
the only thing left in this b-t-h is graphic controller and kbc3910sf or so stupid track in the pcb must be gone. hehehe what a lesson

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akita hp dv2000 intel 945gm graphic

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repairs of laptops and selling of components

Did you tried to do that I said with reset pin of 910?

And also, have you tried to install another CPU? Flash bios?

i have tried another cpu but not flashed the bios i dont think the bios will be a problem if it was the laptop would be dead.but i will try the reset in 910 what you said tomo

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