The **Official** Yamaha RX-V779 Thread(2015 HDMI 2.0a HDCP 2.2 Receiver) - Page 22 - AVS Forum | Home Theater Discussions And Reviews
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post #631 of 634 Old 04-15-2019, 09:03 PM
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Has anyone had an issue with Yamaha's protection circuitry activating?


I've got a three-year-old TRS-7790BL that for a while has been turning off and on randomly. I always assumed it was just a minor quirk -- maybe related to a malfunctioning universal remote -- until just recently when I got the dreaded blinking red light indicating the protection circuitry had activated. Thankfully, I was able to reset the system by holding down the Info and Tone Control buttons and then pushing Main Zone. I initially thought a loose speaker wire connection was probably the culprit, but it happened again last night after I'd tightened all of them.



Any ideas of a possible cause? Could a failing HDMI cable trip the protection circuitry?


(I should note that I'm using the receiver with a Sony XBR 900E, which has had some issues since the last Android TV update. In what is apparently a known issue, the sound doesn't work when I first turn on the TV. I have to turn the system off and on again to get it to work. That got me thinking that the protection circuitry problem could be ARC related but that's just a guess.)






Last edited by ryewhiskey; 04-15-2019 at 09:07 PM.
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post #632 of 634 Old 04-15-2019, 09:59 PM
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Quote:
Originally Posted by ryewhiskey View Post
Has anyone had an issue with Yamaha's protection circuitry activating?
The self protection circuit usually engages itself if it senses the speaker load is too difficult to drive
Examples:
- Low impedance speakers
- driving more than one pair
- a speaker which reaches a low impedance at a specifc frequency even though the manufacturer rates it much higher
- a partial short such as when a single strand of the speaker wire accidentally touches over to the other side. This may happen at the ends of the wire but sometimes even happens along the length especially if the wire gets physically worn.

Or from over heating:
Examples:
- playing music loudly even for just a short time
- playing music at a medium to loud level for an extended period of time
- not giving the receiver enough ventilation such as putting it inside a cabinet or placing another component on top of it which impedes the air flow needed by the ventilation slots
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Last edited by m. zillch; 04-15-2019 at 10:05 PM.
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post #633 of 634 Old 04-16-2019, 12:53 PM
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Quote:
Originally Posted by m. zillch View Post
The self protection circuit usually engages itself if it senses the speaker load is too difficult to drive
Examples:
- Low impedance speakers
- driving more than one pair
- a speaker which reaches a low impedance at a specifc frequency even though the manufacturer rates it much higher
- a partial short such as when a single strand of the speaker wire accidentally touches over to the other side. This may happen at the ends of the wire but sometimes even happens along the length especially if the wire gets physically worn.

Or from over heating:
Examples:
- playing music loudly even for just a short time
- playing music at a medium to loud level for an extended period of time
- not giving the receiver enough ventilation such as putting it inside a cabinet or placing another component on top of it which impedes the air flow needed by the ventilation slots
Thanks for the reply. I'm using the receiver with five Athena bookshelf speakers, so I don't think it's the speaker load. I'll have to recheck all the speaker wire to make sure a random strand of wire didn't accidentally get loose. As for ventilation, it's on a table so it's sides and rear are open but we do sometimes leave books or other objects on top of it. I'll make sure the top is clear.
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post #634 of 634 Old 04-17-2019, 02:54 PM
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Yep, leave the top vents clear for cooling, always. Warm air rises. If the receiver has been exposed to dust, try unplugging it and taking a gentle vacuum to the cabinet vents to clear any dust.

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freezing , RX-V779 , tsr-7790 , unresponsive , yamaha tsr-7790

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