820-00923-A Only one power port out of 4 work and only if I plug it in upside down.

[KC Micro Tronix]

I know that no schematic exists for this model but I am using 820-00293

I am looking at the USB-C signals off of J3300 and there are top and bottom. Both go to the same CD-3215 depending on the port used. All 4 ports are dead but one works if I plug the charger in upside down.

Would it be safe to assume I need to replace all the CD3215's on this LB?

 

[2informaticos]

Start with the port which works one direction only.
Check diode mode to ground for CC1/2 pins.

 

[KC Micro Tronix]

CC1 is basically a short
CC2 is 0.02

I have been poking around on these. Lots are shorted. Some are fine when I slide the surge diodes off others are not

 

[2informaticos]

Change the affected CD3215 chips...

 

[KC Micro Tronix]

I changed them. Still had problems. replaced the LB