20 Most Recent Optimus 12-1978 Seven Band Stereo Graphic Equalizer/sub Woofer Questions & Answers

Looks like a rebadged Pioneer if it is, one of the output channels has probably been damaged and it shuts down to protect the rest of the system. Time for service at your local HiFi dealer.

well mixing old AVR with newer TV (non told) or the reverse does that,! early AVR (mines packed in box attic) has no digital ports only has RCA analog and no hdmi ports. (retired it ,just like me) see there, that is progress. (1/2 joking) just looked at 3770 is all analog a sea of white/red/yellow RCA jacks on the rear.. OLD tech. no TV told but the the best TVs like LG and SAMSUNGS have both. analog and HDMI digital jacks. mine does. LG55xxxxxx there are only 3 choices new AVR, (best choice with a future) buy older TV (hah) buy LG with both on the rear. se this? D = digital A = analog RCA pin jack inputs. video and audio too. a far better TV has both not just HDMI.

google Optimus STAV-3770 remote several offers on line. eBay has several starting at $6.00

It is possible that the solder connections on those transistors are bad and need to be re-soldered. This is common with components that get hot. I would also check any capacitors that are close to them since heat can dry out the capacitors. Other than that, it could be a number of other things.

https://www.remotes.com/optimus-p/optimus%20sta825.htm https://www.google.com/search?q=replacement+remote+for+a+Optimus+STA+825 ..

1. Verify the Unit Isn't in Protect Mode.
2. Check the Fuses.
3. Check the Pigtail Connector.
4. Check for Power at the Head Unit.
5. Check for Ground at the Head Unit.
6. Bench Test the Head Unit and Replace if Needed.

this should work on your model

http://www.amazon.com/OPTIMUS-Replacement-Remote-Control-12070397/dp/B009H5LWKG

I found the plastic button plunger on the front becomes too short to actuate the tiny on/off switch inside. Remove the cover and insert a piece or two of thickish paper (like file-folder thickness) between the plastic plunger and the switch. Let it hang back over the circuit board so it will stay in place.