820-3115-b

djdblaster

New member
Computer works really slow. It is able to boot however, it can even play HD videos. History is: no history. Haven't opened the computer yet.

Any thoughts?
 

djdblaster

New member
So finally back to this one, I've ran ASD EFI and it shows no errors.

Everything works except fan spinning high and computer being slow. Board looks very clean.

Fanny Software reports CPU temperature as -128C.
 
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2informaticos

Administrator
Staff member
First of all, try known good trackpad board/flex.
Also test it disconnecting camera cable.
Check resistance between pins 9/10 of U5511 too.
You can also try new BIOS, with clean ME...
 

djdblaster

New member
I'll try later new trackpad flex.
As for U5511:
pin 9 - 0.450
pin 10 - 0.469
R5260 measures 3.6kOhms on pins 2 (instead of 4.7kOhms). Taken off and it measures 4.7kOhms. Then I took U5511 off too, but same resistance.
 

2informaticos

Administrator
Staff member
I didn't ask to check diode mode (nor ohm scale) to ground.
"Check resistance between pins 9/10 of U5511"
I recently found one 2936 with 70 ohms between these lines...
 

djdblaster

New member
Sorry, I?ve read your post too fast (might have been late too, eyes closing).

I will do it in the morning. Low resistance means SMC could be faulty?
 

djdblaster

New member
I tried new clean BIOS from Internet too, no change.

If you have another file, I'd be more than glad to try it out.
 
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2informaticos

Administrator
Staff member
I had somehow similar case with 820-2936 MLB.
Finally fixed it isolating PCH SMLink1 bus.
That was easy, removing two resistors (R5222/23).
Unfortunatelly no serie resistors present in your case.
You can try cuting off corresponding traces to PCH...
 
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