820-3332 Green led fan but no display no chime

[raainxx]

Hi,
i have this board, no liquid very clean board. when i press power button, fan spin and nothing more.
When i make smcbypass, fan goes to full speed nothing more.
I check some power informations:
PPBUS_G3H 12.8v
SMC_ADAPTER_EN 3.38v
PM_BATLOW_L 3.38v
ALL_SYS_PWRGD 3.38v
PM_DSW_PWRGD 3.38v
PCH_DSWVRMEN 3.22v
PM_SLP_SUS_L 3.34v
Do you have some idea?
thanks

 

[2informaticos]

Do you get VCORE?
Did you resolder U8900?
Check pin 3/U7950 for high level.
Also check PLT_RESET_L and PLT_RST_BUF_L presence.

You can also try new BIOS file.

 

[raainxx]

I clean me with the medusa, nothing change.
PPVCORE_S0_CPU=0,920
i resolder U8900 in the first time.
SYS_PWROK_R=3,34V
PLT_RESET_L=3,33V
PLT_RST_BUF_L=3,34V

 

[2informaticos]

Cleaning ME doesn't help; try full new BIOS...

 

[raainxx]

ok but if i try a new bios, i loose the ME, no?

 

[2informaticos]

Not if you do a backup first.
And Medusa can clean ME from the new BIOS too...

 

[raainxx]

Ok i try it, but same problem.
i clean me with the new BIOS.
do you want file?

 

[raainxx]

hi, i need your help please. i don't know what can i do?

 

[2informaticos]

Monitor VCORE from the start.
Do you get 0.92V from the beggining, or note a little drop from initial over 1V?
Test it at L/R7510.

Try this BIOS.
https://drive.google.com/open?id=1snG09gmpNiHPV43TyfxLEogX29iVVfZt

 

[raainxx]

ok good with your file ,the mac work.
but it's not clean me, no? how can i do if my file is corrupt?
i upload my bios https://drive.google.com/file/d/1zZp...ew?usp=sharing
thanks

 

[2informaticos]

Uploaded file is clean.
You can use it as is, if do not need to change serial number.
If you have Medusa, then change serial, upload to MacBook and fix Fsys checksum onboard.

 

[raainxx]

yes i have medusa but i have the keyboard, can i change the serial without keyboard?

 

[2informaticos]

Use its keyboard, or change the serial with HxD; in your PC, directly on the file downloaded from Internet.
Do NOT forget to fix the checksum!

 

[raainxx]

ok problem solved thanks 2informaticos. i fix the checksum by medusa.
the mbp work fine now.