Question about Sony STR-DB780 Receiver

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Protect problem Whilst the unit was connected to all inputs and outputs we were getting a Protect warning and then no sound. I have opened the unit up cleaned out any dust (Blown and vacuumed) removed any loose foreign debris. I then powered it up without any inputs or outputs connected, it worked for 10 seconds then a clipping sound and Protect warning again. It can't be short as no speakers were attached. Any suggestions or help?

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  • Sony Master
  • 33,294 Answers

Cold solder joints can cause this problem

Posted on Jul 20, 2017

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

Duncan
  • 218 Answers

SOURCE: Protect mode

You may have loosened a solder joint on one of the components inside with your air blast. A repair tech would monitor the outputs DC offset voltage and he will probably see one that is not zero volts and while wiggling various things he should see a sudden change in the DC offset voltage on the bad channel when he touches the bad connection. Then it's just a matter of resoldering the connection. Good luck on this one.

Posted on May 02, 2007

  • 1 Answer

SOURCE: No output on main speakers

I have experienced a similar problem with my Sony STR-GX57ES and took it to a certified tech only to find it needed the power supply replaced. I opted to hunt down a compatible power supply but have been unsucessful thus far. That being said I picked up an STR-D665 for next to nothing and found the power supplies to be quite different (you would hope so any, with the ES meaning Elivated Standard and all) but with the D665 working flawlessly I'd rather have something working than nothing. Good luck!

Posted on Aug 17, 2007

welcomejee
  • 10594 Answers

SOURCE: You Just Responded to my STR-DG820 Issue..........

Its internal problem of receiver and as you said, its brand new so it would have warranty cover. Simply return it and get replacement. I have all tech info including schematics of this particular model and can guide you to resolve this problem but I receommend to askSony for warranty replacement.

Posted on Jan 02, 2009

  • 652 Answers

SOURCE: Sony STR DE-445 unit powers up but no sound

Check the fuse, Sony is known for its random problems with sound. The one I have you must tap it on the side. Its a flicker switch inside.

Posted on Feb 14, 2010

smarthome2
  • 1114 Answers

SOURCE: No sound , display shows digital protect

The most common problem found on FixYa for Audio Video2_bing.gif Receiver's is:

My receiver say's "Protect" or turns on then off. What's wrong? Seven times out of ten it is a shorted speaker or speaker wire. To determine your exact problem, the first step is to disconnect all speaker wires "at your receiver" Next: Turn the receiver back on. If your receiver still says "protect" or turns off, it needs to be serviced. If your receiver stays on; reconnect your speakers one at a time and power back up after each speaker. You may find that after reconnecting all speaker wires it works! Most commonly the small braids of wire from the + to the - have touched and have caused the problem. In some instances, you noticed the problem only when turning the volume up. either way, make sure the exposed wires to your receiver are no longer than 1/2" long and are completely under the screw down terminal or slide in. When you've found the wire or speaker with the problem, your receiver will go back into "protect" At this point, disconnect the wire from the speaker at the speaker that may be causing the problem then test again.* Note* Make sure speaker wires do Not touch each other as this Will cause a short! If you turn the receiver back on and it stays on, you now know the problem is in your speaker itself. To test your speaker, you will need a multimeter. Set it to ohms resistance and touch the speaker terminals, if there is a short internally the meter will read "1......" If it's an analog meter, it will peg to the right. There's your problem. Now, within any speaker there are quite a few possibilities as to what could be causing the problem. Most common is a blown coil and the speaker needs to be replaced. Some speakers have internal crossovers (usually floor standing speakers) and may have a shorted or burnt board (usually very visible brown burn marks on the board) and can possibly be repaired if your handy with a soldering iron. Now, if you disconnect the speaker wire at the speaker and it still says "protect" Check your wire for the obvious cut or nail thru the wire if possible. If your system has wiring that runs behind walls, you may need to use your meter again. Disconnect the wire at both ends, keep the ends separated, put your meter on ohms resistance and touch probes to the + and - wires at one side. If the meter pegs to the right or reads "1...." the wire is shorted and needs to be replaced or repaired at the short. Hope this helps.

Posted on Jun 13, 2010

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Hello i have a clarion vrx785bt head unit it is stuck on amp protec mode i have tried the headunit in my other automobile is there a bulit in amp in this radio? if so what steps can i take to resolve this...


sounds like the IC amp in the head unit is shorted and the unit is in protect mode.
you would need to send it into clarion for replacement or repair unless you can find a local tech to replace the IC for you and reset the unit

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check the fuse output line in the speaker! or maybe you are in protect mode! checkout the speaker, maybe you have defective speaker, thats why your unit in protect mode, thats why no sounds coming out!

Oct 06, 2007 | Marantz SR-6300 Receiver

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Some DVD's sound fine whilst others have background sounds but no voices. I do have an old model TV that has mono sound.Would that cause it?


" Some DVD\'s sound fine whilst others have background sounds but no voices. I do have an old model TV that has mono sound.Would that cause it? "
Hi,
I wrote a short article for someone who had a similar problem a few days ago.
I will edit it for you so that it fits. Here it is.
Your DVD player should have output connectors in the back of it to plug your amplifier or receiver into. If you have a Stereo system (no surround sound speakers, or front center speaker) connect the DVD Audio Cables on the back of the DVD player to the STEREO (or MIXED ) Output Jacks. If it is connected to the Left Front and Right Front jacks of the "Surround Sound" output jacks instead of Stereo(or MIXED) then the dialog will be sent to the CENTER channel output. If you have no center channel speaker you will not hear it. Thus no dialog.
NOTE: In your case for the TV that is mono, here is the solution.
1 Connect a stereo pair of RCA cables (red and white "male" connectors at each end) to the Mixed or Stereo Output of the DVD player (NOT ANY SURROUND OUTPUTS).
2 Purchase an RCA type "Y" connector that has 2 female to a single male connectors on it. Walmart about 3 dollars.
3 Plug the single male plug of the Y connector into the back of the TV set's single mono audio input.
4 Connect the stereo RCA pair from the MIXED output of the DVD player into the Y connector that is now on the back of yourTV.
5 Run your yellow Video output from the DVD into the Back of the Set's yellow input.
That should do it. The sound should be clear and correct with dialog, effects and music.
Hope this helps,
Best,
Mark

Jan 27, 2011 | Audio Players & Recorders

1 Answer

We have just re-connected our KRF-V5300D after moving it and the system comes on for a second, message "Auto Detect" and Mute, goes off after a second and the red light flasges. DOn't have a...


Hi

It sounds like the unit is going into a 'Protect' mode, if this is the case, it is detecting a short circuit on the Output stage. The first thing you should do is disconnect all the speaker wires whilst the unit is un-plugged and then re-test, if it then starts up ok there must either be a problem with one of the speakers or the speaker wires were short circuit down the the casing of the unit, i.e frayed wires of one of the positive cables touching the casing. If the unit still goes into protect then it is posible the output device inside the amplifier has been damaged in which case it will need to be serviced.

Regards

TechSupp12

Dec 12, 2010 | Kenwood Audio Players & Recorders

1 Answer

How do i use it so my tv programming is in surround sound?


if the Comcast cable box has an HDMI output, it should connect directly to one of the TV HDMI inputs. Then connect the LG DVD unit HDMI output to the second HDMI input of the TV. Use two HDMI cables. Do not buy the expensive Monster HDMI cables. If you have already done so, I recommend you take it back for a refund, then buy the low cost HDMI cables which will work just as good and then you can bank the savings toward a new Porsche Boxter!! Now we have the video connected from both the cable box and the LG system.

Now--what do you do if the cable box does not have an HDMI output--just use its component output and your component cable (red, blue and green) to connect to the TV component input. This will still get the video to the TV and good HD pictures. Hum--do you have an HD cable box? You did not say and I just assumed that you did since you got the HDTV. If not, let me know with a follow up question and I will assist in that area further.

Now for the audio connections--The DVD player will not need any connections since it in the LG unit. The sound will come out the speakers when you start playing the DVD. The cable box is where we get the TV audio to feed the LG unit. If the cable box has an optical output, use an optical cable (again the low cost one)and connect to the optical input on the LG.
This will get the TV audio to the surround system. If no optical output, use the red and white (left/right) audio connections and connect to one of the two the LG audio inputs. To hear TV audio on the LG speakers, just switch to that input or the input associated with the optical input.

To watch DVDs, switch the TV to the HDMI input to which you connected the LG unit. For TV, go to the other HDMI input (or component input).
Switch the LG to the audio input to which you connected the cable box to get TV sound.

Hope this gives you food for thought. If so, and you have more questions, just come back in with a follow up.

Sep 11, 2009 | Audio Players & Recorders

1 Answer

Ultimate dd1-1300s why have noise to output


Hello, could you be a little more specific and also please tell me what happend when this problem occured. If noise on the output and amp is'nt going into protect mode, then it sounds like you may have a problem in the power supply section or the output section of the amp. If you have checked all connections and all your power and ground connections are fine and also your head unit is'nt causing the problem then it's definately internal. Sometimes the ground on the rca inputs can cause this. That's why you need to check your rca cable and the rca output of your head unit. Check all that and let me know. I do amp repairs for a living. I own a car audio installation and amp repair business and i'm the cheapest you will find for amp repairs anywhere, all with a warrant if interested. Hope this helps, let me know what you find so I can assist you further. Good luck

Aug 12, 2009 | Ultimate Sound DD1-1300S Car Audio...

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RCA CABLES


RCA cables are the best way to get the audio from your head unit to the amp. If your head unit doesn't have RCA outputs, you might be able to use the speaker outputs of the head unit to connect to the "high power" or "high level" inputs of the amp, if the amp has such inputs (check your manual).

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Help fixing a sound problem with our receiver


You should be able to find all the instructions for these connections in your products owners manuals. The procedure should be straight forward. all the connections to the receiver should be input and output connections. The Receiver is basically just a switch box and amplifier with extras.You must make sure you know which input and output you are using for each of the components. You must have all the remote controls set-up to work with each other. The receiver is the master switch. From it you will control all input sources to the various output sources. Here is a possible set-up . Television output sound and video to the first input/ output section of the receiver. from here you can use the first audio/video output to your dvd/vcr input. This will allow you to record the television programs video and audio to your recording media.The audio/video output of the dvd/vcr will be connected to the second input /output of the receiver.With the second input you can view all the dvd/vcr materials on the television while listening to the sound through your receiver.The master output of the receiver's audio/video output is connected to the television input circuit. This will allow viewing and sound from all the units connected to the receiver. The receiver sound system will receive sound from all the input units as long as the connection are right and the input/out selections from the remotes controls are correct. That is the reason the owners manuals are so important for this purpose. They give these instructions and diagrams to show you the correct procedures for setting them up.They also give you information about customer support either with website help or a call in line for technical assistance.I hope this helps you with your problem.

Feb 09, 2008 | Audio Players & Recorders

2 Answers

PROTECT Mode issue


Here you can get the owners manual for the unit if you need it; http://www.onkyousa.com/download/own_manuals.cfm?cat=Receiver For the protect mode to kick in only for some input sources, then there would have to be a fault in one or more of the pre-amp circuits - there will be a separate one for the radio tuner. Probably the solution for such a good unit is to contact the manufacturers and see what they have to say - probably they will suggest you send it in for service and i suspect they would be right - here are the contact details if you happen to be in the US; http://www.onkyousa.com/support/ or through this link if not; http://www.onkyo.com/ Hope this helps and you get an answer from them - it is probably fixable relatively easily and shouldn't be expensive for parts :)

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1 Answer

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Ok This is a two channel High Current amp. It is stable to one ohm. If the Subs are single voice coil at two ohms the they have to be wired in Parallel that means (Red +) (Black -) are connected to the + and - of another sub and then the (RED +) (Black -) from both go to one output channel of the amp. You pair the other two in the same fashion on the other output channel. If you are getting no output (sound) at all first check if the amplifier is going into protect. (Usually indicated by a red led on the unit. If it is connect only one Sub to each output and see if the protect LED goes out. If it does then you should have sound at the subs. If not check that you have the sub output enabled on the HU some head units do not come with the sub output enabled on the HU. If every thig is enabled, with only one sub connected to each output and the protect LED is not on then your amp is probably blown and needs repair. Nice thing is that MA has a great warrenty policy. Check and make sure the protect LED is off. If it is on you probably have the SUBS wired wrong

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