A dead RCA Pro Logic stereo receiver model RV9978A. Will not power up

SOURCE: RCA RT2280 surround sound mode button wont select 5.1 dolby digital mode.

I had the same problem and this is what I did to fix it. Assuming that all of your equipment is powered on, (tv, blu-ray/dvd, rca receiver) you'll need to go into your dvd players audio menu and select the dolby digital audio.
Once you do this, the digital signal is sent to your receiver from the dvd. The receiver should automatically set itself to the dolby digital preset. If it doesn't, press the surround button until you reach it. I found part of this information here. And the rest was personal experience.
Also, it depends on if the disc format is in dolby 5.1. I hope this helps you.

SOURCE: Stereo Amplifier fades out. My Sansui dolby pro

No that's how to describe a problem, folks - with details. Using internal FM as the source is always the preferred way of troubleshooting system-wide receiver audio problems (no cables or setting in the way).

Does the sound come on immediately with power and then fade or is there a small delay while the electronics stabilize, a click and then sound that fades?

The fizzle probably means something is rapidly overheating or a capacitor is malfunctioning. If both channels do it, I'd suspect a common power supply problem. Can't help much more than that.

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SOURCE: how to hook up sharp dolby surround pro-logic

The source of your program will determine how you hook things up, and if you want to (if it's possible) route the video through the Sharp as well. Some systems have video switching, so you can run all sources through the system, and have a single video cable running to the TV.

If you are using a DVD player, typical Pro-Logic requires a red/white RCA cable from the DVD player to the amplifier unit. The video cable, either a 4-pin S-Video or a yellow composite cable, will run to the amplifier unit for switching purposes, or ditect to an input on the TV.

You can also run red/white RCAs fron the HDTV to an input on the Sharp. You likely have to set the TVs audio output to "fixed" or "external", which will disable the TVs speakers, while putting out sound to the Sharp.