Dell XPS 15z DASS8BMBAE does not detect battery

[hazardus]

Hello,

I need help with this dell motherboard.
It does not detect the battery. I changed the charger IC PU5 (BQ24765RUVR).
It does not detect the battery but it runs off battery. Also it does not charge the battery.

on PR81 on pin2 I've 2.7V the other side nothing.
I removed PR78 and I got 3.3V on PR81.
So I measured short to ground on PR78 at pin2. It's shorted to ground.
I checked this line goes to the EC. Probably a bad EC?

Thanks for any help!

[hazardus]

Re: Dell XPS 15z DASS8BMBAE does not detect battery

Edit: If I disconnect the battery no more short on PR78 at pin2.
No communication on SMBCLK0 and SMBDAT0.

[hazardus]

Re: Dell XPS 15z DASS8BMBAE does not detect battery

I checked PR2 and one side has 3.3V the other 0V.
SMBCLK0 and SMBDAT0 are shorted to ground.
Is this normal?