dell vostro 3559 la-d071p does not turn on

[Techtiger]

Re: dell vostro 3559 la-d071p does not turn on

PL605 (VCC_GT) and PL603 (VCC_CORE) = 0v
PL601 (VCC_SA) = 1.0v only for 1 sec, pressing power buton is present for 1 sec
PL301 (+ 1VALWP) = 1.0v only for 1 sec, pressing power buton is present for 1 sec
PL200 (+ 1.35VP) = 1.35v only for 1 sec, pressing power buton is present for 1 sec
PL100 (+ 3VALWP) = 3.3v always present
PL101 (+ 5VALWP) = 5.0v always present
PL700 (+ 17.4V_BATT) = 17.4v battery charging voltage always present

Test PL605 (VCC_GT) and PL603 (VCC_CORE) resistance mode not in DIODE
Try and Remove one Leg of PL605 & PL603 to find out if the MB power up with no image

[poweron]

Re: dell vostro 3559 la-d071p does not turn on

I removed the two coils but the mobo does not switch on, the voltages are not present, the resistance to ground is 6 ohms

[poweron]

Re: dell vostro 3559 la-d071p does not turn on

Does it seem to me to be too low or is it acceptable?

[Techtiger]

Re: dell vostro 3559 la-d071p does not turn on

Does it seem to me to be too low or is it acceptable?

Seems to be ok

[Techtiger]

Re: dell vostro 3559 la-d071p does not turn on

take a look at after Page 177 to get a good understanding and Schematic Page 55 power sequence check that out

[poweron]

Re: dell vostro 3559 la-d071p does not turn on

I don't understand it very much I have little experience with datasheets

[poweron]

Re: dell vostro 3559 la-d071p does not turn on

how do you read a power sequence? do the circled numbers indicate the sequence progression?

[mcplslg123]

Re: dell vostro 3559 la-d071p does not turn on

how do you read a power sequence? do the circled numbers indicate the sequence progression?

Hey, you have already started understanding it and you are right in your assumption. Power sequence starts with the lower number and last number is where it should post. Just measure the signal lines and see which signal is missing and then you need to go backwards from that point in sequence as thats where the fault lies. Since your mb doesnt even switches , so its not long list of things to check.

[poweron]

Re: dell vostro 3559 la-d071p does not turn on

are there numbers repeating on different signals, does this mean that these signals must be present at the same time?

[mcplslg123]

Re: dell vostro 3559 la-d071p does not turn on

btw, did you checked the mosfets connected to vrm section. These are a bit complex fets where a single fet is made to replace 2 fets. I found one of those fets faulty on this very mb almost a week back. Symptoms almost similar-it turns on and turns off within few seconds without any display. So do check that part.

[poweron]

Re: dell vostro 3559 la-d071p does not turn on

I will check as you say, but what is the vrm section?

[Techtiger]

Re: dell vostro 3559 la-d071p does not turn on

I will check as you say, but what is the vrm section?

That's for the CPU section and check this out for power Sequence
https://youtu.be/sMES_OuGO80

[poweron]

Re: dell vostro 3559 la-d071p does not turn on

who enables the VCC_CORE and the VCC_GT the signal DRMOS_EN?

[poweron]

Re: dell vostro 3559 la-d071p does not turn on

the signal DRMOS_EN not present,I note that this notebook had shut down by itself while it was working

[Techtiger]

Re: dell vostro 3559 la-d071p does not turn on

the signal DRMOS_EN not present,I note that this notebook had shut down by itself while it was working

trace back IMMP VR ON

[poweron]

Re: dell vostro 3559 la-d071p does not turn on

the IMVP_VR_ON signal is present only for 2 seconds together with the power led lighting up when I connect the power connector, but if I press the power button nothing happens

I have to correct: DRMOS_EN is also present for 2 seconds in the same way as IMVP_VR_ON

[poweron]

Re: dell vostro 3559 la-d071p does not turn on

I did some checks following the power sequence (some signals I can't find on the kbc), these are the results on kbc:
PCH_ALW_ON = ok pin 71
SIO-SLP-SUS = ok pin 96
PCH-RSMRST = ok pin 88
SIO-SLP-S4 # = present only for 2 seconds pin67
SIO-SLP-S3 # = present only for 2 seconds pin70
RUNPWROK = present only for 2 seconds pin48
RESET-OUT = present only for 2 seconds pin73
there is certainly something that blocks the micro-ec, what do I still have to check all the tensions enabled by the PCH?