Home Theater Questions? Ask a Technician for Answers ASAP
Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, if all external factors have been checked and ruled out, then the described symptom almost always point to an internal hardware / circuit issue or more particularly, either a low/unstable standby voltage or the system is kicking in early auto-protect mode.
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?
Equally important, could you make use of the repair/Service Manual or at the very least, the schematic diagrams?