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A1286 2012 820-3330 Graphic issue

V

VinceLx

Member
Hello,
I have this board with a graphic issue, see examples attached. When I play a video it's worse, I see just a blinking white display with some colour spots.
Do you have by any chance A BIOS which use only the internal graphic? Maybe the internal is still good?
 

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V

VinceLx

Member
Woow... thank you, this sounds interesting to do! I will try.
I also noticed that on internal display the image is ok, even with video playing; it starts to distort when I force dedicated GPU.
When I look at the block diagram page 2, I understand that mini display port should also use internal and dedicated GPU, through U9390 DP/T29 MUX. Why I don't have a clear image on external display then? Is it possible that this MUX is blocked to dedicated GPU?
 
V

VinceLx

Member
Thanks for the information.
I completed the mod today, it was perfect for a rainy Sunday! I passed my microsolderer exam, it works :D Thanks again for the information.
Just to clarify about this mod: it was originally for 2011 820-2915 (I see L8920)? Then can I use these pictures to modify a 820-2915 board, or there are some steps differents/ to add?
 
N

Narek

Member
For 820-2915 remove u9600 and use solution from this photo + remove R8911 after soldering wires. Some say you can leave u9600 but I always remove it.

For High Sierra you will also need to make jumper between pin 2 of R9704 and pin 1 of C9711, otherwise after closing and opening the lid there will be no image.
 

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2informaticos

2informaticos

Administrator
Staff member
Too much work, disable 2915 in BIOS with Medusa, or flash GMUX.
Best way, use Tiresias GPUkiller; that preserves real backligh adjust.

BTW, flashing GMUX is the fastest; no need to remove MLB from case.
 
V

VinceLx

Member
Thank you both.
I never flashed GMUX, I saw another post about that, so I will first get a Lattice HW-USBN-2A programmer, then I will open another post because for sure I will need you support!
 
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