820-02020 problem with the touchbar

Kappy

Member
I have an 820-02020 which had liquid damage around the touchbar connector JT700 - I've replace this and also order a new touchbar due to the flex connector being corroded. Before taking the damage TB off I thought I would try using both my test rig (not sure if the TB works on it) and also on a brand new one. Both are doing weird things. To best describe what is happening I done a short video which can be viewed here:


I've checked the JT700 (which seems to be the touchscreen connector of the touchbar) using diode mode and they all seems to give a value which Is the same as my donor board. I can't test the voltages as they are located underneath the logicboard and it won't show a display on an external screen (not sure if the M1 work without the screen connected)

I've also swopped screens for a brand new one and it's doing the same thing.

Can anyone shed some light on this?
 

2informaticos

Administrator
Staff member
There are many components interposed between SPI_DFR and SPI_1V8_DFR lines.
Check all related resistors and the chips found on schematic.
 
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