Question about Yamaha HTR-5550 Receiver

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Receiver is automatically switching back and forth between 6ch input and NON 6ch input audio mode/radio.

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This is most likely due to an IC, and could be a heat related problem, or a relay being switched on and off, or both in unison.
You can take the unit apart, and try spraying electronic cold spray on parts, until the unit stabilizes, and then you'll know which part is heat sensitive. Concentrate on spraying the ICs, transistors, and discrete components. Go slow, and allow the cooling to take effect.
Other than that, it's going to be a signal fault, and could be due to a cracked or cold solder joint, worn relay contacts, or some other tricky thing that will have to be troubleshot with specialized equipment.
Also check your connections to your speakers, and the internal solder joints on the jacks, rca connectors, etc.
Good luck, hope this helps, and thanks for using FixYa.

Posted on Sep 07, 2010

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Posted on Jan 02, 2017

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Pioneer vsx-454 not working propley.radio not even hissing,managed to get whisper sound via pc aux,i have cleaned inids?


It sounds like you're not in the right input source (mode) or you have a external source selected. I show your unit as a 1995 model and so check your Tape 1, Tape 2 selection buttons. These "Tape" selection button get dirty contacts that will kill the audio. To clean, with the volume low, press them on and off around 20 times each. This works the contacts back-n-forth and will help clean them.

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We are having the same issue for the past few weeks. The system worked fine for a few months before hand. Were you able to get it resolved?

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Hi,your TV automatically switches to Stereo mode and a pilot lamp comes on most TV sets.
If you want to listen your TV on your Stereo system thru your receiver, you need to connect "Audio Output " RCA jacks of your TV to "AUX input " or "Any input" of your receiver ( except Phone ) than just switch to respective mode corresponding your RCA connection..
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If you have sound from one channel it is probably not a catastrophic failure of the output stages. 

First isolate the problem. Does it occur with all inputs? If so, it is at a common stage after the input switch. Otherwise, it is before the input switch. 

Do you have  anything patched into the signal path between the pre-amp and amplifier, such as a recorder or equalizer? If so, bypass it or remove it and see if that solves the problem.

Also, sometimes the metal contact surfaces in switches oxidize and collect contaminents, causing and interuption to the signal path. Make sure the volume isn't cranked, and then work the controls back and forth - if the channel comes back, even briefly, there's a good chance you can either clean it sufficiently by working the control or better, getting a can of contact cleaner from Radio Shack or the equivalent, removing the covers of the receiver (after pulling the plug), and spray the cleaner into each control before working the control back and forth a half-dozen times. With really bad controls, this can even cause the sound quality to improve.

If this doesn't isolate the problem, its time to take it to a qualified tech.

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check sub setting some radios can select between non fading sub output or aux input

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Connect the DVD player audio with digital coax into the digital audio connection as you described and the DVD video directly to the TV. Now switch the input mode on the receiver to DVD. Then switch the video output mode on the TV to correspond to the input you plugged into. Any source in 5.1 dolby digital or dts should now work properly and have picture too.

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However, if you don't have the HDMI connection, then the Video-In on the TV would have to be switched back-n-forth between Composite / S-Video, depending on how each device is connected to the receiver. [If the TV has 'auto-sensing' Video-In then it should automatically detect the incoming signal from the receiver whether S-Video or Composite or Component.]

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If you still have a problem then check the 'Input mode' setting; leaving it on Coax-1/2 (Auto) would be the better option. This is on pg. 50 of my manual "Specifying the Digital Signal Format".

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I have the same receiver with the same problem. I fixed it by using a cleaning spray on the inside of the input switch. Deoxit 5 is the cleaner and it took care of the problem.

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1 Answer

No sound on DVD mode


Make sure when you select DVD mode that it's not set to "6 ch". (The display will say "DVD 6CH") If you are in the 6CH mode, Use the remote to switch out of this mode by hitting the DVD button again. Hope this helps.

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