hp 8710w / 8710p cpu stuck at 100mhz, need help

hello guys,

I bought a 8710w and 8710p cheep and in non working condition as i needed cheep 17 inch lcds with a good resolution for a totaly different project.

Both laptops did not want to start when i got them ao i started a complete disassembly. Once i got basicyl down only to the mobo beeing inside of the case and everythin else was unplugged i tried just for the hell of it to power them on. And remarkably both of them turned on. So i started plugging back in all the parts and they both stoped powering one omce i plug in tje fingerprint scaner.

So leaving that off i went on and booted from a hdd that was left in the 8710p and wouldn you know it win 7 booted up. It worked suprisengly nice. I changed the resolution from 800 x 600 to 1920 x1200 and work fine for few minutes then it started to slow down as i ran a HD video that was left on by previous owner. The machine started to stutter. As i was only teating things out i had installed only 1gb of ram. Turned it off, replaced the 1gb stick with the 4gb that came with the 8710w and i never made it back to win 7. After the loading screen it all wnt black.

Figured that maybe it was the HDD so i put in a ssd and tried to install te latest Ubuntu from a dvd. The install way painfully slow and clicking next in the setup it would take over 15 min or more to show the next set of options. Eventually when it came to the keyboard layout options i selected it and 30 min after did not advance the screen so i turned it off. Put the Ubuntu install on a USB and did not make it past the 2nd selection screen. Tho the installer it self did initilize faster the the dvd version.

So i tried win 7 and after 3 painstaking hours it finnaly installed.

Came to win 7 and installed the chipset drivers, and at the end a pop up came saying ATM options disabled.

After that went and installed the gpu drivers that took over 20 minutes. And in all that time i was also looking in the task manager that cpu is at 100% all the time, once i restarted i never came back into win.

Went to safe mode uninstalled gpu drivers and managed to instal cpu z and hw monitor and got back into win 7. Opend up cpu z and saw the cpu is at 100mhz. The multiplier is at 0.5 the clock speed is at 200 and the boltage shown is 0.9V. Ill try to upload a picture of that as well.

The problem is same on both machines now. Even if i swpa the cpu , ram or hdd in between the 2 laptops.

I have tried:

-Unplugign the cmos battery over night
-Flashing the latest fios f.20
-Putting the power settings in win7 to performance
-Swaping out cpu ram hdd/ssd
Disconecting every possible peripheral
-Holding power button down for 1min to discharge the power
-and what not...

The bios dose not have any power setting to speak of where i would be able to turn off / on anything that would be related to cpu speed.

As my intent was never to use the laptops as isni only needed the lcds now when they are working i want to fix them up, but this is a real strange problem that in my 23 years using and repearing pcs i never saw.

Only thing i can not try out as i dont have another one is the power brick. As only 0.9V on the cpu seems a bit low to me... ill need to aks around if i can borrow a power brick from anybody and try it then as this one mayBe is not powering the laptop sufficiently. But i measure it and its outputting 19.6V vs the 18.4 that is written on the brick it self for output

Id appreciate any help if anybody had the same issue

 

The only thing that comes to mind is some sort of Thermal Throttling ?

 

Found on some other forum a guy saying he had a faulty power brick cavble that it has a short in it. When he cut one cable the cpu went back to normal.

The power brick and cable i got with this laptop is all taped up and also just right at the connector also all taped up. So i started to jiggle th£e cable and on one location the cpu jumepd up to 2.4 so i just have to keep the cable straight and it all works fine

 

Thanks for the update.