Hi.
Some time ago I took the photos of the PCB inside the wireless version of XHC WHB04B and then promptly forgot about them.
In hopes someone can make a good use of them in the future I'm gonna post them on the forum.
Unfortunately can't upload them all to the forum cause even at half the size they are to large, nor can I link them all in here so you'll have to follow the URL to view them on imgur. Sorry.