Macbook Air 820-3437-B no chime no image

[ielectron]

Hi everyone,
We got an MacBook Air main board 820-3437
laptop was after liquid damage, smc area, bios and Backlight IC
I reball SMC fix all traces, I getting now green orange light but laptop didn't shows image and no chime, fan spinning, cpu gets hot.
Power is on all rails, CPU have Vcore voltage too.
I tried Flash bios with clean dump from forum but no luck still same.
I have removed backlight IC at this moment because I want try would may be cause this issue but is not.
Any Ideas?

 

[2informaticos]

Confirm USB activity, if possible.
Use pendrive with OSX (internal SSD disconnected).
If Link LED flashes, USB OK.

 

[ielectron]

Thanks for response, I tested that and mouse flashed once and no more activity I tried with another ssd with preinstalled OSX no luck and I tried boot it up from external USB same no luck.

 

[2informaticos]

Check all SPI Bus Serie Termination resistors and their traces.
Try new BIOS, with clean ME.

 

[ielectron]

SPI resistors are fine I checked and measured traces they are ok. I tried old bios with clean ME from forum no luck, I have replace bios IC and put same dump into it still no luck. Any more ideas ? I was 100% sure that bios will resolve this issue but it didn't..