Gordon T

Yes, this was the result of using a cheap port splitter, must have been faulty. It is now in the bin.

Thanks for checking, I will try a web search for any smd with ACD.

I have a Celestron starsense h/c and it is now showing application init Please wait. I re-flashed and factory reset the software etc, eventually I looked at the PCB and it looks like an integrated circuit  U10 has burnt out. Does anyone know what U10 is or what I could replace this with? Thanks.