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Old 06-16-2018, 04:09 PM   #1
Johndill
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Default HP EliteBook 8760w - No CPU VCore

Hi, I've got a HP EliteBook 8760w with no CPU VCore, L6, L7, L8 all have no Vcore voltage. VCCSA is present. What should I check next? thanks

Last edited by Johndill; 06-16-2018 at 04:10 PM..
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Old 06-16-2018, 05:13 PM   #2
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Default Re: HP EliteBook 8760w - No CPU VCore

Check enable signal on U1010 pin 7.
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Old 06-17-2018, 02:20 AM   #3
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Default Re: HP EliteBook 8760w - No CPU VCore

Quote:
Originally Posted by piernov View Post
Check enable signal on U1010 pin 7.
If I counted right, U1010 pin 7 is 0.0mV
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Old 06-18-2018, 08:55 AM   #4
Francisco.s
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Default Re: HP EliteBook 8760w - No CPU VCore

Quote:
Originally Posted by Johndill View Post
If I counted right, U1010 pin 7 is 0.0mV
Then check PWR_GOOD_3. Pin 4 U1012 should be 3 volts.
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Old 06-21-2018, 05:32 AM   #5
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Default Re: HP EliteBook 8760w - No CPU VCore

Quote:
Originally Posted by Francisco.s View Post
Then check PWR_GOOD_3. Pin 4 U1012 should be 3 volts.
According to the data sheet for pin arrangement, U1012
pin 1 is 3.3V
pin 2 is 1.4mV
pin 3 is 0.0mV
pin 4 is 0.0mV
pin 5 is 3.3V
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File Type: jpg Screenshot_20180621-213028_Drive.jpg (611.6 KB, 12 views)
File Type: jpg 20180621_213254.jpg (387.2 KB, 15 views)

Last edited by Johndill; 06-21-2018 at 05:36 AM..
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Old 06-26-2018, 02:24 AM   #6
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Default Re: HP EliteBook 8760w - No CPU VCore

Bump
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Old 07-03-2018, 03:08 PM   #7
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Default Re: HP EliteBook 8760w - No CPU VCore

What should I check next?
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Old 07-03-2018, 03:27 PM   #8
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Default Re: HP EliteBook 8760w - No CPU VCore

Apparently PGOOD_MXM is needed for PWR_GOOD_3 to go high and get the CPU power regulator to turn on. PGOOD_MXM comes from the MXM connector apparently, and has a pull-up resistor to +V3S.
Is there a graphics card plugged in in the MXM connector? If there is, remove it, it may be pulling down the line (for an unknown reason right now).
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Old 07-07-2018, 05:03 PM   #9
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Default Re: HP EliteBook 8760w - No CPU VCore

Quote:
Originally Posted by piernov View Post
Apparently PGOOD_MXM is needed for PWR_GOOD_3 to go high and get the CPU power regulator to turn on. PGOOD_MXM comes from the MXM connector apparently, and has a pull-up resistor to +V3S.
Is there a graphics card plugged in in the MXM connector? If there is, remove it, it may be pulling down the line (for an unknown reason right now).
Yes the MXM GPU was connected, I'll check again without it
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Old 07-12-2018, 02:18 AM   #10
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Default Re: HP EliteBook 8760w - No CPU VCore

Quote:
Originally Posted by piernov View Post
Apparently PGOOD_MXM is needed for PWR_GOOD_3 to go high and get the CPU power regulator to turn on. PGOOD_MXM comes from the MXM connector apparently, and has a pull-up resistor to +V3S.
Is there a graphics card plugged in in the MXM connector? If there is, remove it, it may be pulling down the line (for an unknown reason right now).
With MXM GPU in, L6, L7 and L8 are 0.0mV, cold CPU.

With MXM GPU removed, L6, L7 and L8 are open line, hot CPU, PWR_GOOD_3 pin 4 U1012 is 3.3 volts.

Last edited by Johndill; 07-12-2018 at 02:26 AM..
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Old 07-12-2018, 02:53 AM   #11
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Default Re: HP EliteBook 8760w - No CPU VCore

ceck slo enable single
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Old 07-12-2018, 03:35 AM   #12
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Default Re: HP EliteBook 8760w - No CPU VCore

Is the computer booting without the MXM graphics card? Try to see if there is any HDD activity, any sound coming out from the speakers, if caps lock/num lock trigger the associated LED.

This MXM graphics card seems to be pulling down the PWRGD line so try with another graphics card if you have one.
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Old 07-13-2018, 06:23 AM   #13
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Default Re: HP EliteBook 8760w - No CPU VCore

Quote:
Originally Posted by piernov View Post
Is the computer booting without the MXM graphics card? Try to see if there is any HDD activity, any sound coming out from the speakers, if caps lock/num lock trigger the associated LED.

This MXM graphics card seems to be pulling down the PWRGD line so try with another graphics card if you have one.
If I remember correctly, the caps lock was flashing 5 times with the GPU in.

The caps lock stays solid lit without the GPU connected so would it be right to say the motherboard is fine and the issue would be with the GPU?

I have a GTX 675M in my Alienware but don't really want to take it out :-)
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Old 07-13-2018, 06:41 AM   #14
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Default Re: HP EliteBook 8760w - No CPU VCore

Check if you can turn off/on the caps lock light. Put an hard drive with an operating system and check if it's being read. (you should hear the heads moving at least)

You'd have to try with another graphics card to make sure it is indeed the issue.
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Old 07-13-2018, 06:56 AM   #15
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Default Re: HP EliteBook 8760w - No CPU VCore

Quote:
Originally Posted by piernov View Post
Check if you can turn off/on the caps lock light. Put an hard drive with an operating system and check if it's being read. (you should hear the heads moving at least)

You'd have to try with another graphics card to make sure it is indeed the issue.
Thank you in advance for your help :-)

The caps lock was solid lit and did not turn off when pressed.

I'll clean it out and reassemble it for easier testing of your suggestions and replay back some time soon when I have completed your tests and maybe bear it and try out the GTX 675M from my Alienware as it's the only working MXM card I have and unfortunately HP didn't enable the intel integrated GPU on this board.

Last edited by Johndill; 07-13-2018 at 06:58 AM..
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Old 07-13-2018, 09:22 AM   #16
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Default Re: HP EliteBook 8760w - No CPU VCore

Quote:
Originally Posted by piernov View Post
Check if you can turn off/on the caps lock light. Put an hard drive with an operating system and check if it's being read. (you should hear the heads moving at least)

You'd have to try with another graphics card to make sure it is indeed the issue.
Problem solved! I put my Alienware GTX 675M in it and it now boots and displays, is there a way of troubleshooting the MXM card or could I heat it up with a hot air reflow station and see of that will work?
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File Type: jpg 20180714_011716.jpg (690.9 KB, 2 views)

Last edited by Johndill; 07-13-2018 at 09:24 AM..
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Old 07-13-2018, 09:35 AM   #17
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Default Re: HP EliteBook 8760w - No CPU VCore

Great!
Could you take pictures of the dead MXM card?
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Old 07-13-2018, 10:19 AM   #18
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Default Re: HP EliteBook 8760w - No CPU VCore

Quote:
Originally Posted by piernov View Post
Great!
Could you take pictures of the dead MXM card?
It's a Quadro 3000M
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File Type: jpg 20180714_021621.jpg (864.9 KB, 2 views)
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File Type: jpg 20180714_021644.jpg (830.0 KB, 2 views)
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Old 07-13-2018, 12:22 PM   #19
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Default Re: HP EliteBook 8760w - No CPU VCore

MXM graphics cards has 3 different versions which are probably not compatible. In addition, if you buy a MXM card, it can not be trusted. Thus, finding and buying a compatible MXM card takes time.
to test the old card, first check whether the tantalum capacitors or the coils are shorted or not. but probably, the gpu chip should be failed.

Last edited by caspian; 07-13-2018 at 12:23 PM..
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Old 07-13-2018, 12:30 PM   #20
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Default Re: HP EliteBook 8760w - No CPU VCore

Its MXM3.0b . http://forum.notebookreview.com/thre...581056/page-72
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