Home Theater Questions? Ask a Technician for Answers ASAP
Hi and welcome to JustAnswer, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.
Initially, unplug both the bar speaker and the subwoofer for an extended period of time. Thereafter plug back in but into a different outlet bypassing any power strip. Even if just for test purposes, move the two close together while performing links/connections.
Still and if not corrective, then the described symptom of "...LED display doesn't stay on..." is indicative that the Sony has kicked in auto-protect mode. It would almost always be an internal hardware issue..
Would the unit be still under warranty?
Or are you then considering a DIY (do-it-yourself) repair approach? If yes, do you have access to and familiar with a multi-meter and even a soldering iron?