820-3536 Does not boot

[bighead]

Hi there,

I got this macbook with liquid damage around the eDP connector.
Changed the connector and got backlight.

The problem is that I get the circle with slash the prohibitory symbol everytime during the boot.
I never get the Apple symbol.
I tried El Capitan and the new Sierra OS. I got the same result.
These are on my test external HD.

I tried my SSD with El Capitan and got the same problem so this is
not the USB ports problem.

I tried to tun ASD 3S162 but it says it's not compatible.
This should be a Late 2013 macbook.

I don't have the ASD 3S159 but I never had a problem
with the newer 3S162. I'm only using the EFI versions.

WTF could this be? Someone maybe messed with the BIOS?
I checked the board for corrosion but only I found was around the eDP connector.

Thanks.

 

[dukefawks]

PRAM reset? Should be 3S155 or 162.

 

[bighead]

PRAM reset the first thing I always do.

I'm using 3S162 Through Late 2013 to Mid 2014 for the 13" and 15" retinas.
It's not working with this model for some reason.

3S155 for the Mid 2012 and Early 2013 Retinas if I'm not mistaken.

 

[dukefawks]

Try it. The only thing I can think of is that somehow the EFI or SMC firmware got corrupted.