Originally Posted by Extreme_Boky
I've seen your response in the other locked thread.... I suggest you contact authorised Sony service department and tell them exactly what I wrote in the other thread. Explain the previous repair history as well and demand someone with good experience to come and fix the TV... now that I know what demux port is (thanks) I am pretty sure there's problem with local +5V regulation on the AV processor board (this USB port most likely provides a fair bit of current at +5V DC for external units)... or there might be serial USB comms issues with one of the IC's that handle this job.... anyway, it looks like AV processor board fault... the tec who comes to visit you to fix the TV should check the supply rails that are coming from the power supply as well (the AV processor board section in question may have its own regulator and/or decoupling circuit on the power supply board - unlikely, but possible)
I just remembered that there was a documented problem with USB port on one of the Sony models...so ask service department to search Sony database for know issues.
Thank you very much for the response. I did have some more questions, etc., though, before I call Sony.
I am out of warranty (and will ask about the port issues to see if that puts me back in the realm of extended warranties) at this time. Sony will respond by giving me the number of a tech to call who will charge a fee just to come out. They had already stated that I am out of warranty now and, even if the problem had begun at that time, there is nothing they can do. They had already made an offer to replace the TV last year, and I refused.
I would like to know, before I start paying for home service calls, if the particular problem you mention is an expensive one to fix and/or would require new part replacements and costs that would outweigh just simply buying a new TV.
If you live near L.A., maybe I could just pay you.