Dell E6540 No RAM detected.

[Andreasbest]

Re: Dell E6540 No RAM detected.

It is greyed out when i open it, can't type of tick anything.
In your computer is working?

[Spider1211]

Re: Dell E6540 No RAM detected.

Yes, working fine on mine. You seem to have other layers turned on as well. Maybe try disabling a few?

[Andreasbest]

Re: Dell E6540 No RAM detected.

In Visibility i enabled only what you told me now, still the same. Can you please check where R23 is and upload it? it will be easier than fixing the program.

[Spider1211]

Re: Dell E6540 No RAM detected.

There you go.

[Andreasbest]

Re: Dell E6540 No RAM detected.

Unfortunately is missing and trace is solid, no cut.

[Spider1211]

Re: Dell E6540 No RAM detected.

That's fine, R23 is supposed to be a short anyway. In this case a trace is used instead of a jumper resistor. Check the schematic, its an underline resistor.

[Andreasbest]

Re: Dell E6540 No RAM detected.

So i measure voltage to the trace?

[Spider1211]

Re: Dell E6540 No RAM detected.

Yes, black probe on ground and red on any of the 2 sides of R23.

[Andreasbest]

Re: Dell E6540 No RAM detected.

No voltage on position where R23 should be according to boardview.
0v

[Spider1211]

Re: Dell E6540 No RAM detected.

You are measuring with laptop turned on, correct?

Check all the stage 5 signals, SIO_SLP_S5#, SIO_SLP_S4#, SIO_SLP_S3#, etc.

Also make a list of which signal you measured and what its voltage was (after you are done).

[Andreasbest]

Re: Dell E6540 No RAM detected.

Just noticed there are 3.3v but only until the error occurs, then turns to 0v.

[Spider1211]

Re: Dell E6540 No RAM detected.

Which error? The blinking LED thingy?

[Andreasbest]

Re: Dell E6540 No RAM detected.

Yes exactly

[Spider1211]

Re: Dell E6540 No RAM detected.

Thats ok for now, just check the rest. Keep restarting the device if needed to measure the voltage. If you get proper signal till atleast stage 7, we might be able to rule out potential PCH issue.

Additionally, check resistance to ground on all coils. Just in case.

Post your results when done.

[Andreasbest]

Re: Dell E6540 No RAM detected.

Can you please show me PR206 location?
Also please tell me which version of Allegro Free Viewer you work?

[Spider1211]

Re: Dell E6540 No RAM detected.

Am using version 16.6

https://www.alisaler.com/category-laptop-boardview/

Try this: after setting your layers, click on "Show Element" in the upper taskbar, that should enable the "find" menu. (see attached edit from your previous post).

[Andreasbest]

Re: Dell E6540 No RAM detected.

Ok got it enabled now

[Andreasbest]

Re: Dell E6540 No RAM detected.

SIO_SLP_S4# @PR203 is 5V

[Spider1211]

Re: Dell E6540 No RAM detected.

SIO_SLP_S4# has nothing to do with PR203, are you sure you are measuring the right component?

[Andreasbest]

Re: Dell E6540 No RAM detected.

Correction: SIO_SLP_S4# @PR203 is 5V
Also 0v for SIO_SLP_S3# @PR607 (with or without the led blink error)