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A1989 820-00850 - slow and full fan speed

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dudipupan

Member
Hey,

Im struggling with another 820-00850 Board.
The MBP ia very slow. I received it with formatted SSD and I can't even install MacOS. It stucks on status "Less than one minute..." with progress Bar at ~25%
I already tested the Board in a Known working case - without luck. I recognized that the LVDS connector Was damaged. Replace the LVDS cable and the screen Connector of the display Assembly.
Now i'm out of Ideas what could cause this Problem ?

Thank you and best regards
DudiPupan
 
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dudipupan

Member
And the Macbook doesn't Start from Known good battery. But stays on if I Start it with charger and unplugged the charger afterwards
 
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dudipupan

Member
I just sah that i was not the first one working on this Board. Looks like a water damage on the lvds connector. There is a coil missing (L8504) für PP5V_G3S_ALSCAM. Could this be the reason? Missing connection to the cam sensor?
 
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dudipupan

Member
I just replaced the coil but same Problem. Tried also with disconnected Webcam... also without success. Currently I don't have a second woking T2 macbook for DFU restore ??
 
2informaticos

2informaticos

Administrator
Staff member
You don't need another T2 machine.
Run Apple Configurator 2 in other machine, which supports it.

Read here, for more info...

HOW TO collection

I hope this "How to" collection will help our members. I will possibly modify this post in time, if updates available. Trigger SMC_ONOFF_L (PMU_ONOFF_L): It reffers to simulate power button function, when the keyboard is not connected. We need to do this when we work with the board...
boards.rossmanngroup.com boards.rossmanngroup.com
 
2informaticos

2informaticos

Administrator
Staff member
Did you try Internet recovery mode?

Possibly some data lines of T2 affected.
I saw something similar into 01521 board, damaged by liquid spill on audio board.
However, in that case couldn't even complete DFU...
 
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dudipupan

Member
When trying to connect to a WIFI nerwork it stucks connection to it. If I use my Wifi Hotspot without WPS key it connects but breaks with an error while loading (displaying 1h 40 min as remaining time)
The MacBook seemed to work when I bought it (very slow but macOs was installed on the pictures of the offer).
 
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dudipupan

Member
I think it might be the battery flex connector on the Logicboard... I did some continuity measurements and recognised most of the pads arent connected to the battery board. I will try to replace the connector tomorrow... This will be fun :-D I hate soldering those connectors...
 
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