Dell E6540 No RAM detected.

[Spider1211]

Re: Dell E6540 No RAM detected.

Correction: SIO_SLP_S4# @PR203 is 5V

Do you mean PR206? 5V would be PR203 which makes sense since it coming from +5V_ALW

SIO_SLP_S4# goes to PR206. But again, as mentioned before measure everything in the power sequence first then post your results.

[Andreasbest]

Re: Dell E6540 No RAM detected.

Correction again: SIO_SLP_S4# @PR206 trace is 0V as there is no PR206 in soldered.
SIO_SLP_S3# @PR607 is 0v (with or without the led blink error)
Next is SIO_SLP_M# and SIO_SLP_LAN#, i translate correctly the schematics?

[Spider1211]

Re: Dell E6540 No RAM detected.

Its SIO_SLP_A# (not M#, otherwise yes), SIO_SLP_LAN# then SIO_SLP_WLAN#.

Not worried about PR206 (for RAM section atleast) since it is no stuff and not used to turn ON the IC (see Item 6 on page 75 of Version change list)

[Andreasbest]

Re: Dell E6540 No RAM detected.

It's a typo? In Schematics i see clearly M.

[Spider1211]

Re: Dell E6540 No RAM detected.

Ahan, I didn't see the M. Looks like a typo, should have been A.

[Andreasbest]

Re: Dell E6540 No RAM detected.

SIO_SLP_A# @PR303 (not present) 0v
SIO_SLP_LAN# @RH80 has 0v one pin and 3.3 on the other (not present too)

[Andreasbest]

Re: Dell E6540 No RAM detected.

Proceeding to rest morning, brain must enter S5 state for at least 8 hours

[mcplslg123]

Re: Dell E6540 No RAM detected.

The case may or may not be solved, but i appreciate the time and effort dedicated by@spider1211. All the best to@andreabest.

[Andreasbest]

Re: Dell E6540 No RAM detected.

Goodmorning and thank you very much @mcplslg123 !!!
SIO_SLP_A# @PR303 (not present) 0v
SIO_SLP_LAN# @RH80 has 0v one pin and 3.3 on the other (not present too)
+3.3V_M @U102 pin 13 & 14 3.3v until the led error occurs, then 0v.
PM_APWROK_R @UH2 3.3v until the led error occurs, then 0v
1.35V_MEM @RD2 1.35v until the led error occurs, then 0v

Want to keep measuring??

[Spider1211]

Re: Dell E6540 No RAM detected.

If 1.35V_MEM is coming on that means SUS_ON is also coming on. Measure SUS_ON and check. After how long does the error come up after turning on? Does fan spin?

Measure the voltages requested in post #4 and report back. Check of there is voltage on all the coils before error occurs.

[Andreasbest]

Re: Dell E6540 No RAM detected.

If 1.35V_MEM is coming on that means SUS_ON is also coming on. Measure SUS_ON and check. After how long does the error come up after turning on? Does fan spin?

Measure the voltages requested in post #4 and report back. Check of there is voltage on all the coils before error occurs.

I'm sorry for the delay i feel so embarrassed, i found the "problem".
The CPU needed resitting and i can't understand why i didn't think about it earlier.
I'm really sorry for all your time i wasted, i promise it will not happen again.
Thank you very very very much and again sorry

[Spider1211]

Re: Dell E6540 No RAM detected.

LOL, it happens. Lesson learnt I hope

Interestingly enough, I recall asking you to check that same thing on another post of yours.

[Andreasbest]

Re: Dell E6540 No RAM detected.

Really? You asked me to resit CPU???

[Spider1211]

Re: Dell E6540 No RAM detected.

Not in this thread, it was another one.