Alienware 17 R3 LA-C912P missing voltages

[2informaticos]

Try these two files from Vinafix.
Do not expect too much, I don't trust their BIOS files in general...

Dell 17 R3 LA-C912P REV 2.0 ECROM KB9022.bin.zip

drive.google.com

 

[Biggtechman]

Thanks, tried them both but same results. Could the EC IC itself be bad?

 

[2informaticos]

I doubt, but you can change and try.
You should check basic signals for power on sequence.
Any reaction pressing power button?

 

[Biggtechman]

Are they the signals from post #3?

Only the intel chipset lightly warms up, then about 30 seconds or so later the power light goes from nothing to solid red. They are the only two reactions it does.

 

[2informaticos]

Yes, check again what I've mentioned there...

 

[Biggtechman]

Sorry for such a late reply, all the voltages are the same from post #3.

 

[2informaticos]

Please, do not quote an entire post visible few centimeters above.

Pin 115/KBC should have 3V before pressing power button.
If not, desolder UH5 and try to start again.

Pin 114 must drop to 0V when power button is pressed.

 

[Biggtechman]

Pin 115 has 3V before and after powering on.

Pin 114 has 3V before and after powering on, so it does NOT drop to 0V after pressing the power button, if I hold the power button down then it drops to 0V only while holding it down.

 

[2informaticos]

Correct, it must drop ONLY when the button is pressed.
And other reactions must be checked at same time.

You can try new KBC, just in case.

 

[Biggtechman]

No worries, I'll get a new one on order.

 

[Biggtechman]

New KBC has finally arrived, just need time to swap it.

 

[Biggtechman]

New KBC installed and programed but there is no difference in the way it behaves.

 

[2informaticos]

Which EC ROM file did you flash on it?

 

[Biggtechman]

I tired both posted in our thread, I tried KBC.bin first, then when it didn't work I tried ENE_17r3.bin, same results.

 

[piernov]

Voltage on PCH_DPWROK, PCH_BATLOW# and PM_SLP_SUS#?

 

[Biggtechman]

PCH_DPWROK - 3.32V
PCH_BATLOW# - not sure where to test this one.
PM_SLP_SUS# - 0.418V

 

[piernov]

Check voltage on PCH_RTCRST# and PCH_SRTCRST#.
Use component placement diagram to find and measure voltage on RH515, RH83 and RH84.

Requesting Alienware 17 R3 schematic LA-C912P - Badcaps

 

[Biggtechman]

Awesome, I never knew there were board views for Alienware boards, thanks.
RH515 - 3.3V
RH83 - 3.033V
RH84 - 3.019V

 

[2informaticos]

Let's check some basic things for KBC again.
Post levels at pins 67, 124, 125, 37, 100, 106, 107, 110, 115.
Also check AC_PRESENT and +3V_PCH_DSW.

Trigger ON/OFFBTN# and check for drop pulse at PBTN_OUT# at same time.

 

[piernov]

I'm not sure of the exact power sequence requirements but I think at this point PM_SLP_SUS# should be coming up. What's the resistance to ground on this line?