Onkyo/Integra DBS-50.2 Blu-Ray Player - Won't turn on or shuts off immediately.

[Rolin]

I have an Integra DBS-50.2 Blu-Ray Player that I haven't used in a while. Tried to turn on and it turned on for a brief moment with "hello" on the display then shuts off. Dead from that point on unless I unplug it and try again. Took it apart and checked a few well labeled voltages on the Power Supply board and found the 3.3V isn't measuring on the board (unless I'm misunderstanding what I'm measuring). I have a few pics of the board and schematics. There's a 4 PIN voltage regulator at location IC1301 with a part number 070XFC1 by Sharp that I believe should output 3.3V on PIN2, so maybe that's the problem? I found what I think is the correct part at https://www.digikey.com/en/products/...ampaign=buynow


I'm a novice at this and really don't have a lot of experience. But with some luck I've fixed a few things in the past - also received some great help from this forum as well. Really would appreciate some advice and guidance. Thanks

[lotas]

These regulators are controlled, that's why they have 4 pins.
The controller must give a command to turn them on (PWSW) - Power Switch and then the output voltage will appear.

[Rolin]

Thanks for that info. I had the other boards disconnected to help isolate whether this board was the issue. Reconnected CN1003 to CN6101 (main board) and reconnected the front panel connector for the power button (left connectors to other boards disconnected). Pressed the power button and 3.3 volts is momentarily present then drops off. Looks like the problem is elsewhere. Too bad, hoping for a simple fix. I'll dig deeper and see if I can find anything obvious - but I welcome any suggestions.