820-00281 LEFT USBC Charing but No USB funstions. Right side works fine.

Hi All,

This board is not a liquid damaged. Board is clean.

using all 4 usb ports can charge. But only right side ports work for usb funstions.

Left side No light on usb-c adaptors but can the macbook charge.

Can you give a point where to start with?
 

Narek

Member
Inspect area of U3100/3200 chips more closely, maybe there is some corrosion you have missed. I would replace them both too as they are USB-C contollers. Also inspect J3300 and components around for corrosion or damages.
 
HI , Thank you for your quick reply.
My question is as i get 20v and and charging with out any issue, should i touch U3100,3200?
I thought U2800 works dierectly with J3300 in regards to USB functions. Please correct me if im wrong. Thank you.
 

2informaticos

Administrator
Staff member
If the problem is related with U3100/200, then check the voltage at L3500.
You should get 5V there, when an USB device is connected.
 

2informaticos

Administrator
Staff member
Post U3500 voltage, pins 15, 19, 20, 7.
Be sure R3509/39 and C3516 are all good.
You can compare values in diode mode around U3500 with UB700.
 

2informaticos

Administrator
Staff member
You don't need another board.
UB700 area is the same as U3500.
For voltage comparison, you MUST connect USB device to corresponding ports.
Enable signal will come high only if a device is detected.
 
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