A1706 3 ports work, 1 fails

[Proteus2188]

HI All,

I have this A1706 with a strange issue.
1 USB port wont work.

3 others keer working with no issues.
replaced the ports, but same problem.

Replaced both CD3215 with known working ones. no result.

What am i missing?

[mon2]

Re: A1706 3 ports work, 1 fails

What fails? USB power negotiation of 20v or USB function for data transfers?


1) review the mechanical fit of the non-working connector. Maybe the contacts are damaged on the USB paddle board?

2) check the ldo rails on each ACE controller. Compare the voltage ldo rails of working vs. non-working ports.

3) remove all power. Meter in diode mode. Check the diode mode reading of the USB pins to compare working to non-working.

Red meter probe to ground (yes red).

Black meter probe to point to test.