Another 820 - 00165 A liquid damage, number of issues

[2informaticos]

"Fan High Speed constantly"
Usually trackpad board/flex.
Sometime caused by LIO board/flex.
Their connectors can get problems by corrosion too.

As per schematic, p?ns 1, 2, 5, 6 for Q7706 are tied together.
Check if pins 2 & 5 of Q7707 are steady high.

Do you get steady 3V3 at pins 18/19 of J8300?
Also check pin 14 level.
Image always present, only backlight flickers?

 

[JohnB8812]

These issues all sound like they are related to the IO board and cable. Have you tried new ones?

 

[estelanim416]

JohnB8812 Looks like you were right.
Found some replacement io board and cable, just the high fan speed now
I will remember to always check with another IO board!

Thank you 2informaticos I will see if I can sort this fan issue now

 

[estelanim416]

All sorted now.

Thank you very much for your help!

 

[estelanim416]

Hi again,

Unfortunately the unit is back, high fan and slow performance only this time.
2informaticos I will test the keyboard flex cable, apart of that, any other things I should check?

Kind regards,
Daniel

 

[2informaticos]

I suppose corrosion still affects the board.
Possibly some crap accumulated under SMC/CPU.
You can try heating them untill 180-200 degrees; use only quality flux.
But inspect first for any liquid sign on the board.

 

[2informaticos]

Run HWMonitor, it shows more information...

 

[estelanim416]

thank you

OK, cpu heatpipe, cpu proximity, pch die, memory proximity and airflow report 128 degrees Celcius. I am guessing one or more sensores are broken, yes?

 

[2informaticos]

Start digging around U5800, page 44.
Check all related sensors, traces, resistors...

 

[estelanim416]

2informaticos client is happy to run it with the app ( he just want it asap)
In your experience, would it matter if I left it like that?

 

[2informaticos]

If system run smoothly, then no problem...