DELL INSPIRON 15-3567 (15341-1) not turning on

[tech_guru]

Hello.
I have a DELL INSPIRON 15-3567 with motherboard VEGAS/TURIS SKL/KBL 15341-1 91N85 which is not turning on.
When connected to psu it draws 0.011A and led lights up for a second. When power button is pressed it goes to 0.027A for 15-20 seconds without led and goes to 0.011A again.

According to the power sequence of the schematics I test it OK until stage 3 where SIO_SLP_S4# needs to enter PU5151 (APL5930KAI) to get the 2D5V_S3, VCCST and so on. SIO_SLP_S4# gets grounded almost 24ohms straight when power is connected. If power is not connected, it goes to 42k.

I don't know in this stage if BIOS programming would help, I did program it anyway with no luck.

I must say that X1802 32Khz crystal does not show anything on the DSO.

As it seems SIO_SLP_S4# gets generated from the PCH which is integrated in the cpu chip.
Am I doing something wrong or do I miss something? Any help would be appreciated. Thank you.

[Techtiger]

Re: DELL INSPIRON 15-3567 (15341-1) not turning on

uplode the link of the BIOS you programmed , Did you flash both EC + Main ?

[tech_guru]

Re: DELL INSPIRON 15-3567 (15341-1) not turning on

uplode the link of the BIOS you programmed , Did you flash both EC + Main ?

I only flashed BIOS (attached is the original bin it had and the one i tried after). i cannot flash EC (if you mean the SIO program) since i dont have a programmer for it. i only have SPI programmer at the moment.

If the EC program is corrupted it wouldn't even turn on without image or have crystal clock available?

[tobbyhush]

Re: DELL INSPIRON 15-3567 (15341-1) not turning on

SIO_SLP_S4# is probably shorting through a semi-conductor. Either because something is wrong, or because a semiconductor component has failed. I'd take a close look at PQ4415 and PQ4416, or something that has to do with it. I.e. PU5151 and U4005. Try injecting some voltage to that board and see if anything gets hot. Obviously don't inject the voltage into SIO_SLP_S4# though. Note that this is the rail that should then enable +1.00V_CPU(VCCST), 2D5V_S3, and in turn enables DGPU_PWR_EN.

I don't think it is a BIOS issue if it wasn't touched. That rail shouldn't be pulled down unless something in the hardware was wrong.

Attached the schematic.

[Spider1211]

Re: DELL INSPIRON 15-3567 (15341-1) not turning on

SIO_SLP_S4# gets grounded almost 24ohms straight when power is connected. If power is not connected, it goes to 42k.

Are you measuring resistance while the board is powered? If yes, you will get erroneous readings. Measure its voltage instead and report back.

SIO_SLP_S4# is active low (denoted by the #), which means that if this signal is 0V, laptop S4 rail will be inactive.

Do not blindly inject voltage, it may cause more harm.

[tech_guru]

Re: DELL INSPIRON 15-3567 (15341-1) not turning on

Are you measuring resistance while the board is powered? If yes, you will get erroneous readings. Measure its voltage instead and report back.

SIO_SLP_S4# is active low (denoted by the #), which means that if this signal is 0V, laptop S4 rail will be inactive.

Do not blindly inject voltage, it may cause more harm.

Thank you both for your answers!

U4005 is omitted.
What voltage should I expect on SIO_SLP_S4#, in order to figure out what voltage to inject? Shouldn't be high around 1.8-3v since it is EN signal of PU5151?

I noticed that when connecting to power I can measure a voltage around 0.3v for a millisecond like a fluctuation, it seems like it gets dropped.
I also tried lifting up the SIO_SLP_S4# "legs" of PU5151, PQ4415 and SIO chip to see if the signal gets high but nothing.

Is there any chance that PCH is shorted internally and drops it?
I didn't understand what you mean with "SIO_SLP_S4# is active low (denoted by the #), which means that if this signal is 0V, laptop S4 rail will be inactive".
The resistance to ground measurement is 42k without power and goes to 24ohms when mobo gets powered.

[SMDFlea]

Re: DELL INSPIRON 15-3567 (15341-1) not turning on

uplode the link of the BIOS you programmed , Did you flash both EC + Main ?

Bios requests go here - https://www.badcaps.net/forum/forumdisplay.php?f=40

[Spider1211]

Re: DELL INSPIRON 15-3567 (15341-1) not turning on

Measuring resistance while the board is power does not provide any useful reading. Measure voltage instead!

Typically the signal would be 3 to 3.3V.

I didn't understand what you mean with "SIO_SLP_S4# is active low (denoted by the #), which means that if this signal is 0V, laptop S4 rail will be inactive".

SLP_S4# basically means put S4 rail to SLEEP (in other words, disable it). The # means that the signal is active LOW. This means that when the SIO 'see' that the voltage of SIO_SLP_S4 is 0V it will turn off the S4 rail (any other chip that relies on SIO_SLP_S4# will also turn off).

When you turn on the laptop, you don't want it to 'Sleep' anymore and therefore the PCH will change the SLP_S4# voltage level from 0V to a HIGH state (3.3V usually).


When you press the power button, there is a sequence of events/checks that happen before the rails are activated. In your case, measure the SIO_SLP_S4# voltage and NOT its resistance when you power the board. I assume the 42K ohm you mentioned is measured before connecting any kind of power to the board. If that is the case, then you definitely do not have a short on that line.

Rather than blindly injecting voltage, there is a sequence/timing diagram on page 102 of the schematic (assuming the attached schematic on post #4 is the one you are using). Follow it from top down and measure the VOLTAGE of the respective signals and report back.

Hope this helps.

[Spider1211]

Re: DELL INSPIRON 15-3567 (15341-1) not turning on

Out of curiosity, did you try to 'reset' the BIOS?. Remove the CMOS battery and all power adapters. Press and hold power button for about 30seconds, release button and connect AC adapter and try to boot normally.

[piernov]

Re: DELL INSPIRON 15-3567 (15341-1) not turning on

Just to clarify, SLP_S5# is the enable signal for S4 rails, SLP_S4# is the enable signal for S3 rails and SLP_S3# is the enable signal for S0 rails. When SLP_Sx# is low it means it is in the Sx state or below. If it is high it means it's in a higher power state.

[lapfix]

Re: DELL INSPIRON 15-3567 (15341-1) not turning on

Hello friends ,
I ve got same motherboard with same issue ..but SIO_SLP_S4# is not shorted.

Try to follow power sequence ; with multimetre all voltage try to rise up for second than nothing = 0.002/0.050/0.001 etc..

With every button trigger the fan turn half , led powr light up , than off.

consumption is from 0.006 without trigger power button , once trigger 0.219 than off.

Until 8a ( power sequence ) VR_ready stay with 0mv.

What should measure too !!
thank you

[ravi_1617]

Re: DELL INSPIRON 15-3567 (15341-1) not turning on

Vegas/Turis 15341-1
board doesn't turn on.
bench power 0.01 reading/when power switch pressed 0.03 reading

At PWR1 (PIN 2) 3.035 Volts present .
Also found at pin 2 of PWR1 2.8 volt coming from RTC cell. without adaptor or mains battery ,is this normal.

at PL4502 3.3volts / at PL4501 5 volts
any time mode PL5301 power present 1.011 .is it ok

board starts when once RTC battery removed/install.
once board starts problem will no occur for many days to months .
But problem the remains .user is in hurry i return it 2-3 months back.

Thanks

[mcplslg123]

Re: DELL INSPIRON 15-3567 (15341-1) not turning on

PWR1,Pin2 behaviour is normal. It has a pulupfrom ECVBAT via R2451. So voltage is expected there without adapter/battery.

Pl5301 at 1V is ok as its always on rail. You should get 3V/5V/1V without turning on on this platform.

This mb is known to have issues in RTC section. So do check this