Hi,
I got my second K8055 today. After i carefully assembled and connect it to my laptop, this thing won’t work 
DO8 LED permanently lit, even after i switched the pics (old K8055 to new). The new one won’t work.
As far i can see, there where no short circuits or some ‘dirty’ solderings.
What can i do next?
Luc
If it is not the pic, the problem is probably related to a soldering or assembly error. Make sure that all components get their supply voltage.
Check for interrupted grounds or supply lines, check for short circuits between tracks etc… It is very likely that a mechanical problem is the cause of troubles.
Yes, i found the problem.
There was a short circuit in the usb connector (inside he connector). Thank god it didn’t damaged my laptop.