Trouble with Yamaha TSR-7850

J

Juice88

Enthusiast
Hi All - first time posting here. Pulling my hair out trying to figure out whats going on with my receiver. I bought it 3 years ago as a refurb on Woot. For 2.5 years it was working great with my Front LCR speakers (no sub). Recently it started to act up with the electronics, wouldn't turn on without going into protection mode. Sometimes would take 48 hrs until I could even kick it into the Protection mode, because it didnt want to turn over (faint click, faint red light, almost like there wasnt enough juice to start it up). Well it's been powered on for weeks now, but the new issue is no sound coming from my L and R speakers, only the Center. It's not a speaker issue, as I've tried all three speakers in the Center terminal and they work. When running test tones in settings, I don't hear anything coming from L and R, only C. I tried replacing speaker wires, reset the banana plugs, I did a factory reset on the receiver. Is there a chance those two terminals are faulty? Is there anything I can try to confirm this? At this point I'd rather know if its beyond repair so I can just begin shopping for a new one, unless I can fix it myself. 3 years is too short with a receiver!
 
lovinthehd

lovinthehd

Audioholic Jedi
Generally the factory reset will be the most a consumer can do other than checking for good cables/connections without stray strands of wire or something along those lines, as you've already done. Repairing such an avr may not be cost effective and availability of parts could definitely be an issue, too.

Was it well ventilated? Sounds like the L/R channel amps may have issues, unlikely the terminals themselves are the issue (or do you have reason to think so?)....are the surround channels still okay?
 
J

Juice88

Enthusiast
Generally the factory reset will be the most a consumer can do other than checking for good cables/connections without stray strands of wire or something along those lines, as you've already done. Repairing such an avr may not be cost effective and availability of parts could definitely be an issue, too.

Was it well ventilated? Sounds like the L/R channel amps may have issues, unlikely the terminals themselves are the issue (or do you have reason to think so?)....are the surround channels still okay?
I'm not using Surrounds. Only LCR. Yes well ventilated. I was lumping the terminals into the same overarching problem, whether its them or the channel amps. The terminals look fine to my naked eye, have only plugged and unplugged banana plugs into them. I'm not technical enough to look into each (terminal vs channel amp) separately, but more than willing to try something.
 
TLS Guy

TLS Guy

Seriously, I have no life.
I'm not using Surrounds. Only LCR. Yes well ventilated. I was lumping the terminals into the same overarching problem, whether its them or the channel amps. The terminals look fine to my naked eye, have only plugged and unplugged banana plugs into them. I'm not technical enough to look into each (terminal vs channel amp) separately, but more than willing to try something.
I'd say the amps are blown. That is now a 13 year old receiver. In addition those seem to have had an excess of issues, including amp failures.

So time to recycle that unit and upgrade.
 
lovinthehd

lovinthehd

Audioholic Jedi
I'm not using Surrounds. Only LCR. Yes well ventilated. I was lumping the terminals into the same overarching problem, whether its them or the channel amps. The terminals look fine to my naked eye, have only plugged and unplugged banana plugs into them. I'm not technical enough to look into each (terminal vs channel amp) separately, but more than willing to try something.
I'd still try the surround channels just to see if they're fine or not.
 
J

Juice88

Enthusiast
I'd say the amps are blown. That is now a 13 year old receiver. In addition those seem to have had an excess of issues, including amp failures.

So time to recycle that unit and upgrade.
13 years? I believe the TSR-7850 came out in 2018
 
lovinthehd

lovinthehd

Audioholic Jedi
13 years? I believe the TSR-7850 came out in 2018
Yeah that's the date I saw on hifiengine.com myself plus the features seem to agree....ol' TLS gets a little rant-like with avrs despite some crappy UK gear he has :)
 
J

Juice88

Enthusiast
I'd still try the surround channels just to see if they're fine or not.
Just checked - Surround L and R works. I wish I could somehow use these terminals for the Front L and R instead.
 
lovinthehd

lovinthehd

Audioholic Jedi
Just checked - Surround L and R works. I wish I could somehow use these terminals for the Front L and R instead.
Unfortunately your amp assign setup doesn't do that....otherwise I agree!
 
J

Juice88

Enthusiast
Altho for 2.0 use you can likely use an all-ch stereo mode to get there somewhat....

3.0* (my center works fine), but you're right. I have it on the 'sports' mode all-channel while watching this NFL opener, and it doesn't sound half bad. With my L and R plugged into Surround L/R
 
lovinthehd

lovinthehd

Audioholic Jedi
3.0* (my center works fine), but you're right. I have it on the 'sports' mode all-channel while watching this NFL opener, and it doesn't sound half bad. With my L and R plugged into Surround L/R
Still, just a limited workaround....better to just change avr for more options :) Good luck!
 
TLS Guy

TLS Guy

Seriously, I have no life.
13 years? I believe the TSR-7850 came out in 2018
I looked it up, and the source Iooked at said 2013, but what you find on Google is not always right. Due to the litany of issues I found on line about them I figured 2013 was likely correct. For the rap sheet they have accumulated in five years, then they are likely a problematic model.

The problem is that these majors change models like shirts, and that is NO way to breed good equipment.

Whereas the British equipment that Lovin loves to deride, was designed ethically and with great care. It is for good reasons those units command huge prices, in fact nose bleeding prices of late. However it is deserved and justified.

That equipments has a proud heritage. Every instruction manual contained the circuits and full service manual were available to all at low prices. They were good manuals as well. Now they say it is all a trade secret. Well let me tell you something, no one sane would want to copy and emulate the junk of the majors of today
Yeah that's the date I saw on hifiengine.com myself plus the features seem to agree....ol' TLS gets a little rant-like with avrs despite some crappy UK gear he has :)
You mean that superbly designed and elegant gear that stays working! You really can spout some BS. No I do NOT use AVRs, for good sound reasons and never will use an AVR.
.

I do believe that the Quad range of amplifiers were the finest produced and have not been bested, though some are comparable. When it comes to presentation and elegance of design, they are on a class of their own. So they remain sought after even when a half century or more old.
 
highfigh

highfigh

Seriously, I have no life.
"Turn over"? It's not an engine.

Disconnect the speakers and see if it will turn on. If it doesn't, do a hard reset and try it- if it still doesn't turn on, it needs to be serviced or replaced.
 
AcuDefTechGuy

AcuDefTechGuy

Audioholic Jedi
I bought it 3 years ago as a refurb...
That's the key word = REFURBISHED.

I mean all electronics can malfunction, whether they are made in the UK or China or Vietnam, AVR or AVP.

But Refurbished complex electronics have a higher risk of malfunction.
 
lovinthehd

lovinthehd

Audioholic Jedi
I looked it up, and the source Iooked at said 2013, but what you find on Google is not always right. Due to the litany of issues I found on line about them I figured 2013 was likely correct. For the rap sheet they have accumulated in five years, then they are likely a problematic model.

The problem is that these majors change models like shirts, and that is NO way to breed good equipment.

Whereas the British equipment that Lovin loves to deride, was designed ethically and with great care. It is for good reasons those units command huge prices, in fact nose bleeding prices of late. However it is deserved and justified.

That equipments has a proud heritage. Every instruction manual contained the circuits and full service manual were available to all at low prices. They were good manuals as well. Now they say it is all a trade secret. Well let me tell you something, no one sane would want to copy and emulate the junk of the majors of today

You mean that superbly designed and elegant gear that stays working! You really can spout some BS. No I do NOT use AVRs, for good sound reasons and never will use an AVR.
.

I do believe that the Quad range of amplifiers were the finest produced and have not been bested, though some are comparable. When it comes to presentation and elegance of design, they are on a class of their own. So they remain sought after even when a half century or more old.
LOL you do use avrs, albeit without amps, like your Marantz (asian! oh no!) pre-pros. How do you figure 2013 to 2023 is 13 years? :) If you can dish it out, sometimes you just set yourself up.....and I was thinking of Gerrard.
 
T

Trebdp83

Audioholic Spartan
Unfortunately, as mentioned, refurbished units are a mixed bag. Using All Channel Stereo as work around is not ideal.

You can check to see if it is a front channel processing issue or an amps issue with a few tweaks.The 7850 can bi-amp front speakers. So, if front amps are gone, you do still have two more you can assign to the front speakers.

First, move your front speakers’ wires from the front terminals to the “EXTRA SP2” terminals. Then, go to Setup>Speaker>Power Amp Assign and set it to 5.1 bi-amp. For speaker sizes, set Front at Large, Center at Small and Surround at None. Now, run test tones.
 
J

Juice88

Enthusiast
Unfortunately, as mentioned, refurbished units are a mixed bag. Using All Channel Stereo as work around is not ideal.

You can check to see if it is a front channel processing issue or an amps issue with a few tweaks.The 7850 can bi-amp front speakers. So, if front amps are gone, you do still have two more you can assign to the front speakers.

First, move your front speakers’ wires from the front terminals to the “EXTRA SP2” terminals. Then, go to Setup>Speaker>Power Amp Assign and set it to 5.1 bi-amp. For speaker sizes, set Front at Large, Center at Small and Surround at None. Now, run test tones.
Just to confirm, EXTRA SP2 (Surround Back/Zone2/Bi-Amp) and not EXTRA SP1 (F Presence/Zone2)?

I did that, and nothing from test tones on L and R. Center still working. However, in the configuration, the "Front" option is greyed out, so I cannot set anything (large, small, none). The Center I am able to choose small, the Surround I chose as none. Surround Back and Front Presence are also greyed out like Front, and Subwoofer I chose none.

Also, my L and R speakers have bi-wiring which I've never used. For this bi-amp assignment, does it matter if I'm using the upper terminals (which I've always used) or the lower terminals?
 
T

Trebdp83

Audioholic Spartan
Sorry. Forgot that you cannot adjust Front size when in bi-amp mode. A full signal will be sent to each set of speaker terminals automatically. Surround Back will be greyed out as you are using the amps for the fronts.

It seems no info is being sent for front channels at all. If it were just the front amps, you’d think you’d still get a signal to the two other amps in bi-amp mode. Hmmm….
 
J

Juice88

Enthusiast
Sorry. Forgot that you cannot adjust Front size when in bi-amp mode. A full signal will be sent to each set of speaker terminals automatically. Surround Back will be greyed out as you are using the amps for the fronts.

It seems no info is being sent for front channels at all. If it were just the front amps, you’d think you’d still get a signal to the two other amps in bi-amp mode. Hmmm….
Bi-amp mode should work with this wiring? After some reading, it sounds like I should have 2 sets of wires for each speaker... Front L and R to the top speaker terminals, and EXTRA SP2 L/R to the bottom speaker terminals??
 

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