Speaker pops when AV receiver turned on

ScoobyDoo

ScoobyDoo

ScoobyDoo

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I've got a yamaha rx 675 av receiver and 5.1 surround speakers.
I've had this for approx 6yrs.
For the past few days when I turn on the yamaha I get a loud pop through one speaker. If I leave the yamaha on for say 5mins, turn it off and then back on, I don't get a pop.. Its only when the yamaha has been turned off a while.
Nothing else in my setup has changed.
I've tried changing the speakers around and unplugging one or two but I still get a pop through a different speaker.
Any ideas?. Is the yamaha on its way out?
Could I leave it tuned on constantly so I don't need to power it down?
 
First thoughts would be the output capacitors.

As long as nothing else has changed in your system and with the surrounding bits of hardware such as new devices or a change of wiring, then the fact that this has only recently started would suggest something is wearing out.

Add to that the nature of the way the fault manifests: It happens when the amp is cold but not when warm, that is often the first sign of capacitors starting to fail. A warm capacitor that's a bit dicky will still behave okay, but when cold it will look like it has failed. It's a useful trait to remember when fault-finding in circuits. A can of freeze spray and a hair dryer can often help track down bad caps.

Does the amp live in an enclosed cabinet or have some other gear on top of it?
 
Thanks for the reply.
Yes the amp is in an enclosed cabinet but ive taken the rear of the cabinet out to give it some airflow.
Theres nothing sitting ontop of it blocking the air vents. Its been like this for the past 7yrs.
Looks like it may be failing like you say and its time for a new receiver.
 
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