I too have this exact same problem, I purchase a faulty switch from ebay and replaced the p13usb chip and the switch works perfectly now in handheld mode but will not dock, my next option is to replace the USB C port as I have seen this done for other issues and wondered if it may be a faulty connection to one of the hidden pads underneath. But as the switch is working I am reluctant to replace it at this stage, especially with that awful screen connector, nearly bent a pin the last time I had it apart
crwdns2934105:0crwdne2934105:0
crwdns2934113:0crwdne2934113:0
crwdns2915270:0crwdne2915270:0
crwdns2889612:0crwdne2889612:0
0