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Old 01-15-2018, 08:21 PM   #21
FrozenHaxor
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Default Re: Alienware M17x R3, LA-6601P is missing +VCC_GFXCORE_AXG CPU voltage

I've found an SLJ4M chipset. Its a QM67, still Cougar Point, I believe it's going to be a better one to test instead of the HM67 currently there.
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Old 01-16-2018, 01:05 AM   #22
atsio
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Default Re: Alienware M17x R3, LA-6601P is missing +VCC_GFXCORE_AXG CPU voltage

I suppose, yes.
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Old 01-20-2018, 01:45 PM   #23
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Default Re: Alienware M17x R3, LA-6601P is missing +VCC_GFXCORE_AXG CPU voltage

PCH changed to QM67. Same behavior.

I have noticed that capacitor PC93 was damaged and measured almost open. Unsure if this was like that before or after the rework. Changed to a good one, no change.

I have a brand new exactly the same KBC on hand, perhaps I could give it a try.
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Old 01-20-2018, 10:39 PM   #24
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Default Re: Alienware M17x R3, LA-6601P is missing +VCC_GFXCORE_AXG CPU voltage

After changing the KBC, board behaves in the same way.
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Old 01-21-2018, 05:07 PM   #25
FrozenHaxor
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Default Re: Alienware M17x R3, LA-6601P is missing +VCC_GFXCORE_AXG CPU voltage

I've traced the LPC bus lines and wired up my debug card.

Looks like it's not even rolling any codes, does that mean the BIOS is not right?

Here's a quick video of how it behaves:
https://youtu.be/n1eh1221UOY
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Old 01-23-2018, 06:31 AM   #26
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Default Re: Alienware M17x R3, LA-6601P is missing +VCC_GFXCORE_AXG CPU voltage

KBC should not be related to this kind of issues except if it disturbs BIOS data lines, but given you get to an S0 state with CPU reset de-asserted it should be fine.
Not having POST codes could mean various things : communication issue between PCH and BIOS ROM, communication issue between CPU and PCH, clock issue, corrupted BIOS, BIOS itself doesn't output any code. You can check the signal on the BIOS CS# pin to at least see if it is being activated.
I've got a older desktop board with the same symptoms, I replaced northbridge/southbridge/clock generator/BIOS ROM/Ethernet IC and it still doesn't want to read the BIOS even though the CPU reset signal is de-asserted.
Not sure what to troubleshoot going from there.
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Old 02-05-2018, 03:24 PM   #27
FrozenHaxor
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Default Re: Alienware M17x R3, LA-6601P is missing +VCC_GFXCORE_AXG CPU voltage

Yeah I recall that I did check the SPI Flash lines for the BIOS and it was talking just fine. Tried 2 more BIOS dumps with no result. I'm stuck at this point.
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