Dock USB Ports not working when Switch is in TV mode.

Hello everyone.

Today I realized that all 3 USB ports on the dock are dead. I went online to find out this tends to happen frequently, and apparently all you have to do is power cycle the console and the dock. I followed all the tips, but none worked. Thanks to this, however, I noticed that the USB ports DO provide power, but only when the Switch itself is un-docked! The moment the Switch is docked, all power to the ports is killed off (tested with a USB ampmeter).

My nephew also has a Switch, so I borrowed it to troubleshoot what could be faulty. I tested my Switch on his dock first, with the HORI Ethernet adapter and the Pro controller with its cable, and my Switch had no issues on his dock. I also checked his Switch on my dock, but everything was the same, no power on the ports as long as a Switch is docked. At this point I am sure my dock is faulty. I took it apart to inspect the PCB, but I could see nothing wrong with it. I visually inspected it with a digital microscope, and I checked the capacitors on it. It doesn’t appear to have any shorts. Maybe one of the chips is faulty, but there aren’t any schematics to check and see if anything is out of the ordinary.

The last thing to check was the Power Adapter, but after checking its Output, it seems to work fine (also used my nephew’s to rule out the possibility of a fault). I connected the Switch to a separate power outlet but that didn’t do anything either.

Maybe its a simple fix, or maybe not, but I would rather try and fix this myself than get a new dock. Any ideas of what I could do?