em análise Dell Optiplex 9020 AIO

[warsztat]

Hi friends, I have a case - Dell Optiplex 9020 AIO ipplp-az revA00,PCH = SR137, CPU = I5-4670S.  After power on, system like boot (led hdd blinking) but no display. 
When I press button power + menu, dell test dispaly ok, on screen green, red, blue & another test pictures but normal start display black. 
I programm new bios  but no sukcess.
I moved old bios ME Region to new bios still bad, I tested RAM seems ok. 

I have not found a diagram, which pins of the display connector are transmit for identification?

no screen on lvds or hdmi or vga

 

the bios file I used :

 

 

I used another bios but the same effect.  

Both bios, before I move ME Region an error code appears 3 & 7 flashes orange, on the dell website, the identification of this error is RAM configuration or RAM replacement.

i tried to use other ram error the same.

If i move ME Region from old bios the computer returns to its original state.

 

 

 

Editado: 2 de Junho de 2021 por warsztat

[warsztat]

any solutions ? after a long time with the new bios the diode stopped blinking orange, it is possible that the board has configured the RAM because it does not exist anymore this sygnal. still no picture.