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
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HP EliteBook 8760w - No CPU VCore
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Re: HP EliteBook 8760w - No CPU VCore
Check enable signal on U1010 pin 7.OpenBoardView — https://github.com/OpenBoardView/OpenBoardView
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Re: HP EliteBook 8760w - No CPU VCore
Originally posted by Francisco.s View PostThen check PWR_GOOD_3. Pin 4 U1012 should be 3 volts.
pin 1 is 3.3V
pin 2 is 1.4mV
pin 3 is 0.0mV
pin 4 is 0.0mV
pin 5 is 3.3VLast edited by Johndill; 06-21-2018, 05:36 AM.
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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).OpenBoardView — https://github.com/OpenBoardView/OpenBoardView
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Re: HP EliteBook 8760w - No CPU VCore
Originally posted by piernov View PostApparently 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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Re: HP EliteBook 8760w - No CPU VCore
Originally posted by piernov View PostApparently 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 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, 02:26 AM.
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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.OpenBoardView — https://github.com/OpenBoardView/OpenBoardView
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Re: HP EliteBook 8760w - No CPU VCore
Originally posted by piernov View PostIs 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.
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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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.OpenBoardView — https://github.com/OpenBoardView/OpenBoardView
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Re: HP EliteBook 8760w - No CPU VCore
Originally posted by piernov View PostCheck 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.
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, 06:58 AM.
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Re: HP EliteBook 8760w - No CPU VCore
Originally posted by piernov View PostCheck 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.Last edited by Johndill; 07-13-2018, 09:24 AM.
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Re: HP EliteBook 8760w - No CPU VCore
Great!
Could you take pictures of the dead MXM card?OpenBoardView — https://github.com/OpenBoardView/OpenBoardView
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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, 12:23 PM.
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Re: HP EliteBook 8760w - No CPU VCore
Its MXM3.0b . http://forum.notebookreview.com/thre...581056/page-72
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Re: HP EliteBook 8760w - No CPU VCore
Originally posted by SMDFlea View PostIts MXM3.0b . http://forum.notebookreview.com/thre...581056/page-72
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