Cedar_Intel_MB 13269-1 5V_S5 0V

[James Mi]

Hello colleagues, good morning, it is a pleasure to greet you.
Could you help me? First of all I want to tell you that this forum has been very helpful to me, here I find diagrams and clarify the doubts I have since I am new to this, but I find the subject of plate repair. interesting
I have a dell board, model

Cedar_Intel_MB 13269-1
PWM FX3MC REV: AOO

It is off, with a consumption of 0.034
reviewing the diagrams that I leave attached so that you can help me
I have all the signs

+ RTC_VCC
RTC_RST #
DCBATOUT
3D3V_AUX_S5
3D3V_AUX_KBC
S5_ENABLE

up to S5_ENABLE of KBC pin 14 which is in high voltage without pressing the button,
I replaced the PU4503 giving the same result, ping 6 and pin 20 on voltage 0, it receives voltage through pin 12 with 19.0 V, pin 3 VREG3 3.30 V, I do not get VREG5, nor do I have voltage on pin 18 which I understand gives output to 5V_PWR to become the next 5V_S5 signal

I would like to know where I can find the error or if I need any conditions to enable them.

PWR_5V_LL1 -> 5V_PWR -> 5V_S5
PWR_3D3V_LL2 -> 3D3V_PWR -> 3D3V_S5

which are the following signs.

[mcplslg123]

Re: Cedar_Intel_MB 13269-1 5V_S5 0V

Replace Q2402 first and check again. You can remove Q3004 and replace it for Q2402. Leave Q3004 unsoldered for the time being. Q3004 is located near lan connector.

[James Mi]

Re: Cedar_Intel_MB 13269-1 5V_S5 0V

But the voltages in the Q2402 apparently are fine, I receive in S - 3.30 V and in D - 3.30V for this to happen the G has to have low voltage and if it does
the strange thing is that in Q2403 I do not receive voltage in D - 0 V, I think that in D I should have a high voltage that comes from S5_ENABLE and 3D3V_AUX_KBC and in G I have 0V from Q2403

[Techtiger]

Re: Cedar_Intel_MB 13269-1 5V_S5 0V

PSL_OUT# should be 0V to switch on Q2402 and for Q2403 since SOURCE is GND with 0V on GATE it will not get switch on DRAIN 0V is correct what is the voltage on R2436

[James Mi]

Re: Cedar_Intel_MB 13269-1 5V_S5 0V

in R2436
PIN1 3D3V_AUX_KBC - 3.3V
PIN2 S5_ENABLE - 0V - which are the go to the DRAIN of the PQ2403

The weird thing is that on pin 14 of the KBC - S5_ENABLE I receive 3.3 V

R2436 is not shorted because I injected voltage into it and if it passes to the DRAIN of the PQ2403

[Techtiger]

Re: Cedar_Intel_MB 13269-1 5V_S5 0V

Remove PQ2403 and test again this is a common pro in this MBD

[James Mi]

Re: Cedar_Intel_MB 13269-1 5V_S5 0V

I am going to try replacing Q2403, but before I have verified that the 3 and 5 v
They are enabled as long as 3V_5V_EN is at a high level to be able to reach the PU4503 with pin6 and pin20 at 3.3V but this 3V_5V_EN signal is 0v measuring from the pad

PR4504
PR4506

so pin6 and pin 20 are at 0v

according to the scheme this would be the sequence of S5_ENABLE

KBC -> PAG. 36> PAG. Four. Five

At what point would it arrive at q2403? when exiting the KBC through pin 14?

[James Mi]

Re: Cedar_Intel_MB 13269-1 5V_S5 0V

friends the problem was in the PU4404, it was generating voltage problems
consumption is over 0.034
now I have another problem and I have noticed that the signal PM_SLP_S4 # I have it in 3V
According to the diagram, pressing the button goes down to 0v but immediately goes up to 3v
where could i check?

[Sametbey]

Re: Cedar_Intel_MB 13269-1 5V_S5 0V

1 AC_IN plugs in and PU4404 opens, sends AC_OK.
2 PU4503 sends 3VREG signal to the IO chip.
3 KBC 14 pin S5_ENABLE signal sends to PU4503. 6 20 + 3V
4 PU4503 3V_PWR and 5V_PWR generates
5 KBC power button. It starts with
and other steps.

[James Mi]

Re: Cedar_Intel_MB 13269-1 5V_S5 0V

I found a video on youtube, which has the same problem and he fixes it like the attached image,
right on pin 21 where the PM_SLP_S4 signal from the KBC comes out

https://www.youtube.com/watch?v=hOTahvbWTcI

[Sojke]

Re: Cedar_Intel_MB 13269-1 5V_S5 0V

Where do RED and YELLOW wire go to??

[Sojke]

Re: Cedar_Intel_MB 13269-1 5V_S5 0V

Why the hell did he connect a wire to NC??

[James Mi]

Re: Cedar_Intel_MB 13269-1 5V_S5 0V

Hello colleagues, I relive the issue because I have exactly 3 boards of the same model with the same problem.


the problem is that the signal that comes out of the CPU PM_SLP_S4#
It must be in low voltage in state S5 but it is not, and following the diagram this signal comes from the PCH, will the CPU be shorted?