820-00850 stays at 5v

[2informaticos]

Use very tiny wire for this job.
0.01-0.02mm magnet wire can be found on Aliexpress.
You can also use broken iMac video cable to get fine wires too.

Consult schematic and boardview; some pads may not be needed.

 

[Blackmambo90]

Yes, some was not needed, but the wire i used, is it too big? Should i replace it? (I am not sure what is the size of this one

 

[Blackmambo90]

Okay tried to solder in a mew chip today - dame behavior as with no chip... wonder if its my soldering or if the chip is not the right one (order online)... any thoughts?

 

[2informaticos]

Can be solder problem, or fake chip (if chinese new)...

 

[Blackmambo90]

Long time long time...
After more than a year i finaly had some time to work on this one againe.

Ended up fixing most of the pads and installing another chip (ub300)
The mother board does boot and work now

How ever i have a couple questions:

1. I ended up not restoring 11, 22, and 26 (PP5V_S4_T_USBC) since they are all internaly related in the chip to pads 34 and 69 and those pads are still ok, also i have not fixed the pad 24 (UPC_TA_GPIO1) it look like it does not go anywhere
Is it critical?

2. I might damage the CB212 and C7006 in the procces. They look to be still connected but i am not sure. How crutial they are?

3. The usb ports on the side of the board where the ub300 is are not working, not sure if its related to the issue #4 there is power output but no data( ex mouse recive power but does not work)
But it does charge the mac itself if connected to charger with those ports

4. The mac does not wake up from the sleep. I am not yet sure why. Touchpad does click but black screen/no backlight. I run the diagnostic (D key) and there is no issues found


Pram reset did not help and it is freshly reinstalled os

Thank you!

 

[2informaticos]

Posibly broken traces when machine was dropped.
I recommend to inspect JB500 area and compare readings with J3300 side, for adjacent components.