20 Most Recent RCA Onkyo Integra Dtr-4.6 Av Receiver Wrat - Page 11 Questions & Answers

In order to fix this you will need to replace the whole player, they are not repaired because there is no demand due to the low cost of new.

There are different types of USB port. For instance my computer has two types. One with a blue connector and one with a black connector. It might be that your USB ports are not suitable for that device. You need to check the specifications of the USB ports on your computer and the specifications of the MP3 player. Continuing to use the device might cause damage to the computer.

From where is the signal coming?. If it's a PlayStation, Xbox or bluray player settings may be needed in order for it to operate in the desired way.
Also the content has to support Dolby Digital like a tv show even if the receiver had DD the program also has to be in DD.
A lot of new players such as Fire Tv, Apple TV or Roku now send a Dolby Digital Plus signal which only newer-ish support. It's sort of a blanket signal that covers Dolby Digital but won't read as such. It will display as Dolby Digital Plus.
I can help with settings if you give details on the devices. Receiver type. Media type.