820-3115 b screen white

[brunomotter]

Does it chime?

 

[andrespi]

not chime.

 

[brunomotter]

try flashing bios first

 

[andrespi]

not

 

[brunomotter]

Reset SMC and PRAM, see if it chimes

 

[andrespi]

no reset pram, yes reset smc, persist problem

 

[2informaticos]

Put back original BIOS.
If pure white, missing 3v at TFT matrix.
Voltage at pins 2/3 of J9000?
If no voltage, check L9004 first.

 

[andrespi]

Are these measurements l9004 and pins 2/3 with the screen connected?
you have bios original functional?

 

[2informaticos]

Do NOT touch the BIOS again; write back the original.

Of course, LCD must be connected when measure there.

 

[andrespi]

excuse me, I don't understand " Do NOT touch the BIOS again; write back the original" what do you mean "write back the original"? It refers to erase bios that it has and write another file good of the same board reference?

 

[2informaticos]

You don't have a BIOS problem; original board BIOS is good, put it back.

 

[andrespi]

l9004=3.2v pin2/3=3.2v

 

[2informaticos]

With 0.78V board boots.
Are you sure there is no USB activity?
Did you check both ports?
If yes, try BIOS...

 

[andrespi]

yes both ports, you have file bios good for this board

 

[2informaticos]

820-3115-B DTY3 Clean ME - OK.rar

drive.google.com

 

[andrespi]

yes it is bios, you are genius!!