820-3330 no image

Alan.L

Member
It chimes with backlight. no image. i also have tried external display and nothing, even with LCD cable unplug.


PPvcore_gpu = 0.9v
L8360 = 0v (should be 1.36v) - resistance to GND on L8360 is 172 ohms
PP3V3_S0GPU = 3.3v
GPUVcore_en = 3.3v
P3V3GPU_EN = 3.3v
PPVIN_S5_HS_GPU_ISNS = 12.58v

I've already replaced U8900, I've reflowed the old and its still same,

yes. there seems to be USB activity. I've tried other bios from a donor board for testing and its the same.
 
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2informaticos

Administrator
Staff member
You are missing vRAM voltage; can't get GPU working.
Check U8350 voltages; pins 15, 19, 20.
Be sure R8359 and C8355 are OK.
Also check all traces and resistors aroun U8350.

You may need to change U8350 and/or Q8360...
 

Alan.L

Member
OMG, you are right.

PP5V_s0 is missing on the U8350

i couldnt see it because fan cable was in the way.

 

Alan.L

Member
hi 2informaticos, testing this today, booting to osx is super slow. serial is unavailable. ASD EFI doesnt show any sensor. its all empty.

do you have a Clean ME bios for this 3330 board?
 

2informaticos

Administrator
Staff member
"ASD EFI doesnt show any sensor. its all empty."
Can you explain better?

Upload original BIOS somewhere...
 

Alan.L

Member
You know when you load ASD EFI, left side has all the available options you can tick to test. This one only has fan, cpu, memory. No sensor.
 
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Alan.L

Member
I've tried the 1st one and sensors test is still missing.

booting to macos is super slow.

do you think i have a missing component?


 
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