Sony STR-DN840 power button shows solid green light but not powering ON

jay sony

My 5 years old Sony STR-DN840 AVR suddenly became dead and stopped responding (both remote control and onboard switches) but shows solid green light over power button.
Every time a solid green light is shown after unplugging and plugging the power cable back to wall power outlet. The LED display doesn't work and no clicking sound.

I tried the following but I find same solid green light with AVR completely dead:
1. Changing power outlets.
2. Removing all speaker cables and AM/FM cables. Only the power cable is connected.
3. Resetting by pressing power button for 5 seconds. Not sure AVR responded to reset.
4. Checked the glass fuse is okay on the stand-by board.

Please let me know whether there is any steps to follow to root cause the issue and fix the problem based on the above the symptom.


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