820-2330 No S3

[2informaticos]

Now remain ISL6259 and SMC, no more things connected there...

Remove ISL6259 first and wait for board to cool down.
You will get higher values, but should be equals.
If not, SMC need to be changed.

 

[Bouba148]

OK i'll do that i'm out for the moment.
Regarding the board cool down, i've already noticed that thanks for confirmation

 

[Bouba148]

So I guess that in your previous post you wanted to write ISL6258 right?,
So with the ISL out and the board cooled down more thatn 5 min with a fan, I have the following values:
SDA: 0.544V
SCL: 0.649V

As you said it's "highers" values.
So could you please explain me why we check the values: If I understand correctly ( correct me if I'm wrong please) we are trying to see which component is making "trouble" on the SCL line right? Because on a ggod working board we should have the same values for SDA and SCL right?
In my case the only one left it's the smc, as U7000, the battery and the BIL board are not in the "loop" anymore right?
Also I've forgot to mention that I've replaced the ISL6258 and it's still the same and the values in diode more are
SDA: 0.482V
SCL: 0.498V

In SMC Byass mode both line have a solid 3.41V : no communication
My last chance is to re assemble everything and try an SMC Reset......will let you know later....
Thanks So far

 

[2informaticos]

You're right, ISL6258...
You've correctly understood ; some component blocks the SM Bus Battery.
SMC must be changed now.
If you already solder another ISL6258, don't forget to measure again whitout SMC.

 

[Bouba148]

Hi 2Informaticos,
I removed the SMC and here are the mesurements in diode mode with red probe to gnd after 20min cooling down:

SDA: 0.502V
SCL:0.504V
Resistance beetween Pin3 of J6955 and pin 100 of the SMC pad on the board: 2.7 Ohms , I was expecting a lower value, but as they're not closed from each other i think value is acceptable.
And Resistance to gnd (something starnge that i don't really understand):
sometimes both are around 3.9KOhms, sometimes both are around 21KOhms and sometimes it's a mix of those 2 values ( sda has one value and scl the other or the opposite ). Maybe I should check the battery of my fluke.......

@ 2Informaticos: no pb if I use soldering paste instead of ball which i don't have......?

 

[2informaticos]

When you measure very low values, leads resistance is important.
Bad contacts of probes can give you 0.5-1ohm even more, when shorting probes.
You must ad this value to the measured circuit...

Be sure all the lines are good before soldering new components.

Data lineas read good now.
You can reball SMC with paste, of course.
But could be very dificil; check Louis channel.