820-01700 Stuck on 20v 0.7A

[2informaticos]

First of all, welcome to the forum!

To enter DFU, no need of S5 voltages.
Be aware, do not choose restore option; as it will erase all your data!

0.7A is high too much for a board in off state; you've said no S5 voltage.
I suppose the battery was not connected.
A thermal cam should show something, in case of such high current.
Some chip should heat more than normal.

 

[Hussamri]

Thank you so much for your reply,
I wish I knew everything you guys are talking about before purchasing my laptop.

I am not sure if it is relevant, by I have 64gb of RAM and 2tb of SSDs.

But to answer your questions: No the 0.7 shows after you connect everything back.

The board is connected to the battery and still shows 20v 0.7

would it be possible that I didn't perform the reviving steps correctly, because it my laptop still shows on the host computer when connecting for reviving.
or does it mean that there is still shorting somewhere?

Thanks.

 

[2informaticos]

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

Follow the exact steps from tutorial...

 

[Hussamri]

Thank you so much,
I've asked the guy to send a discribtion of what he did, step by step and this is what he sent me:

Initially the board was reading 5v and 0.0Am. After diagnostic I found out they ppbus_g3h was short, then I injected voltage to find the short cos I know it will be obvious to find without a thermo cam. Then I found the short around the ssd chip that takes 5v then supply 2.5v. I removed and the short went off completely and the power was 20v, 0.00am but if left for a while the Amp will go from 4-72 then falls back to 0.0amp. I replaced the chip and immediately 5v was restored but the 2.5v wasn’t and I realized that it requires the computer to turn on before the 2.5v can be pushed out. So I decide to go through the power rails as it was still not turning on but was pushing out 20v , 0.72amp but the amps wasn’t stable. So I checked the pmic rails & they are all present, then I checked the first s5 rail which is pp1v8_s5 and it was 0.0. So I check for a short and realize there was a short of 27.45 but I seem not find where the short was coming from.

 

[2informaticos]

"I found out they ppbus_g3h was short, then I injected voltage to find the short"
Common failure for "a good technician" .

I just suppose he talks about U9580.
If was shorted, probably SSD was already fried.
If not, it was killed for sure when injected voltage.
Resistance to ground at L9580/81 can confirm this.

Your data is lost and T2 cannot boot the board, as it can get access to its dedicated SSD partition.

 

[Hussamri]

So it is either I replace the whole board now, or replace the SSD?
If I lost my data already I would go with changing the whole board, I guess.

 

[2informaticos]

Replace the board...