Question about Yamaha HTR-5550 Receiver

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HTR-5550 will shut-off after an hour of operation

The protection circuit kicks in after one hour approximatly even if it has been used at very low output power. It is certantly not too much current drawn by the speakers. What electronic components could be at fault. I know a bit the electronics and I could repair the faulty component if I could know what it is. I have no circuit diagram to refer to. Faulty capacitor?

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Hi Guillot

I would be checking about the regulator and power output stages for dry solder joints. With the progressive heating of the unit from operation, failing solder joints may be causing a condition to occur that operates the protection circuit. Careful inspection under good light is required. You may find soldering around outputs, drivers and other devices mounted on heat sinks or other devices that run hot to have circular fractures in the solder about the lead to be commonly responsible for the problems you are facing., if you have a soldering suitable iron, and the time and patience, go for it. I have included a link to a soldering guide here.

Good luck, thanks for using FixYa, and a rating of FixYa would be great for my time to address your problem. Cheers

regards
Graeme

Posted on Mar 16, 2008

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My HTR 5460 won't stay on


try pressing power while holding the 'fm/am' and 'input mode' buttons. This will tell you what part of the circuit is making it shut down. It should show something like I PROTECT, PS PROTECT, etc.

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1 Answer

Speakers work at low volume. Around -39 db, receiver shuts off.(protection mode) Tried moving speaker wires, alternating red and black. No go. When powered back up, display says ck sp wires. Once I...


Decibels correspond to the output voltage being sent to the speakers. In your case, the voltage is reached at -40dB is the threshold that causes whatever is happening to operate the receiver's protection circuit. You might have a bad speaker, with a voice coil that shorts at the higher voltage. Below that level it's okay, but at the magic point the insulation breaks down, and that's when the receiver sees trouble.

You might try connecting only one speaker at a time using a short length of wire other than your current ones. If the trouble occurs on one speaker only, you've found the culprit. If the receiver operates normally on each speaker, try reconnecting one speaker at a time to determine if one of the speaker wires may have a short somewhere. There might be a weak spot in the insulation, not causing any trouble until the voltage is high enough.

If the receiver still goes into protection with just one speaker, there's an internal problem. Some part in the amplifier may be breaking down at that voltage. Or a part value has changed, causing the protection circuit to kick in even though there's really nothing wrong. Bad solder connections may have developed. Unfortunately, this kind of problem usually needs the services of a shop with the equipment and circuit information to figure out what's happening. If you can find a Yamaha-authorized warranty servicer, they might already know some typical causes if they've seen units with the same trouble.

Try the speaker test first. Then let a shop tackle the receiver if it looks like that's where the fault is. Good luck and thanks for using Fixya!

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Sounds like you have a bad amp IC or transistors.
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I would suggest a quick resoldering of the flatcable connectors, both on the display board as well as on the main board. That should fix the problem.

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1 Answer

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Sounds like a possible power short, especially if you have speaker cables connected to the receiver but not to speakers -- leaving the ends more likely to short (even via a single thin copper strand across a millimeter or two, when the voltage peaks). The receiver's message says "Check Spkr Cables," right? (They do mean the Speaker Cables!) Most receivers have a built-in power overload detection/protection shut-off circuit to save you from such mistakes.

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You never want to disable protection circuits. They are designed to detect malfunctions and prevent further damage by shutting down the power. Trying to defeat this may render the unit useless or a fire hazard. Have unit serviced

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1 Answer

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jerry ...
question??? before you stored the unit, was it working fine?

are you using the same sets of speakers like before?

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1 Answer

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Speaker wire contact with each other is the problem. Check the back of ALL SIX speakers including sub-woofer. You should find wires contacting each other. Fix that and your problem will be solved.

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