820-01958 A2179 dead only Fan Spin from time to time

[Sn0w3y]

As i mentioned above - the only Problem is i aint got a Schematic or Board View.

Could you please help me out where to chekc or to measure.

Thanks in advance !

 

[Sn0w3y]

Just for you guys.

 

[2informaticos]

Thanks, schematic and boardview already posted on the forum.
You should read more threads, not only personal ones.
Is the way to save time on your job...

 

[Sn0w3y]

As i am relatively new to this Forum i want to kindly ask you if you can tell me where to start looking for a fault on this Board..

 

[2informaticos]

As always for T2 machines, start with DFU mode.
More information available here:

HOW TO collection

I hope this "How to" collection will help our members. I will possibly modify this post in time, if updates available. Trigger SMC_ONOFF_L (PMU_ONOFF_L): It reffers to simulate power button function, when the keyboard is not connected. We need to do this when we work with the board...

boards.rossmanngroup.com

Be sure to follow all the steps in the linked DFU tutorial.

 

[Sn0w3y]

Tried to boot in DFU mode and tried to Restore as well as Repair - only got an Error saying that the Device was either disconected or connected twice.

Edit: Now tried Recovery Mode - Error 4010 but the Error Text is the same.

 

[2informaticos]

PPBUS_G3H is stable?
Check it in both cases, when fan spins and not.

 

[Sn0w3y]

PPBUS_G3H is stable at 12.89V Fan did not spin since DFU and Recovery mode.

 

[2informaticos]

You should check if doesn't drop at the time you get the error.

 

[Sn0w3y]

It "drops" to 12.69V shortly before the Error appears.

But I don't think this has to be the Error right ?

 

[2informaticos]

That could be the sign of T2 communication problem.
May be T2 internal issue, or something else blocks it.
Check if any AWAKE, or SLPS2R voltage drops at same moment too.

 

[Sn0w3y]

All of the SLPS2R Voltages drop 1 sec. before it fails. I also observed that the Recovery Mode is only Possible if battery is connected. Is this normal?

 

[2informaticos]

The voltage drop explains the DFU error.
Do you note dropping voltage with battery connected too?

 

[Sn0w3y]

Yes it only starts in DFU or Recovery with Battery connected. If Battery disconnected, the Board only shows this LED lit up but not in Recovery or DFU mode.

 

[2informaticos]

Without battery, only charger, what voltages can you find on the board?

 

[Sn0w3y]

PPBUS_G3H = 12.58V
PPBUS_HS_CPU = 12.58V
PP5V_G3S = 5.10V
PPVIN_G3H_P5VG3S = 12.57V
PPVIN_G3H_P3V3G3H = 12.57V
PP3V3_G3H_RTC = 3.29V
PP3V3_G3H = 3.3V
PP1V8_G3S = 1.804V
PPVCC_S0_CPU = 0V
CPU_VR_EN = 0.189V
PP1V05_PCH_CPU = 0,00V

 

[2informaticos]

"Do you note dropping voltage with battery connected too?"
Or voltages drop only with charger alone?

 

[Sn0w3y]

no voltage drops with both of them plugged in

 

[2informaticos]

Did you try DFU with both charger and battery connected?

 

[Sn0w3y]

Yes i tried both - without Battery it is not possible to Detect recovery on the Healthy Device