The Sony STR-D665 Receiver sat on a shelf for about a year in a clean environment (no dust, sealed bag) and now it has no sound output from the main front speakers (A & B), from the center speaker or from the headphone jack. Interestingly, the rear speaker output is just fine. The unit powers on and receives input from all the audio input sources. The speaker selection buttons (A & B) click when toggled, but do not bring sound to the speakers. Speaker wiring has been checked and works just fine with another receiver. Likewise, the only fuse in the unit is OK. Any ideas -- probably need to get it to a repair shop??
I have experienced a similar problem with my Sony STR-GX57ES and took it to a certified tech only to find it needed the power supply replaced. I opted to hunt down a compatible power supply but have been unsucessful thus far. That being said I picked up an STR-D665 for next to nothing and found the power supplies to be quite different (you would hope so any, with the ES meaning Elivated Standard and all) but with the D665 working flawlessly I'd rather have something working than nothing. Good luck!
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Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.
Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.
You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.
If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.
If it protects immediately on a cool power up you should disconnect the speaker connections and try it '*****'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.
The most common problem found on FixYa for Audio Video Receiver's is:
receiver say's "Protect" or turns on then off. What's wrong? Seven
times out of ten it is a shorted speaker or speaker wire. To
determine your exact problem, the first step is to disconnect all
speaker wires "at your receiver" Next: Turn the receiver back on. If
your receiver still says "protect" or turns off, it needs to be
serviced. If your receiver stays on; reconnect your speakers one at a time and power back
up after each speaker. You may find that after reconnecting all speaker
wires it works! Most commonly the small braids of wire from the + to the
- have touched and have caused the problem. In some instances, you
noticed the problem only when turning the volume up. either way, make
sure the exposed wires to your receiver are no longer than 1/2" long and
are completely under the screw down terminal or slide in.
When you've found the wire or speaker with the problem, your receiver
will go back into "protect" At this point, disconnect the wire from the
speaker at the speaker that may be causing the problem then test again.*
Note* Make sure speaker wires do Not touch each other as this Will
cause a short! If you turn the receiver back on and it stays on, you now
know the problem is in your speaker itself. To test your speaker, you
will need a multimeter. Set it to ohms resistance and touch the speaker
terminals, if there is a short internally the meter will read "1......"
If it's an analog meter, it will peg to the right. There's your problem.
Now, within any speaker there are quite a few possibilities as to what
could be causing the problem. Most common is a blown coil and the
speaker needs to be replaced. Some speakers have
internal crossovers (usually floor standing speakers) and may have a
shorted or burnt board (usually very visible brown burn marks on the
board) and can possibly be repaired if your handy with a soldering iron.
Now, if you disconnect the speaker wire at the speaker and it still
says "protect" Check your wire for the obvious cut or nail thru
the wire if possible. If your system has wiring that runs
behind walls, you may need to use your meter again. Disconnect the wire
at both ends, keep the ends separated, put your meter on ohms resistance
and touch probes to the + and - wires at one side. If the meter pegs to
the right or reads "1...." the wire is shorted and needs to be replaced
or repaired at the short. Hope this helps.
Protet mode is a special diagnostic mode that starts when a fault is detected.
When in protection mode the unit is prevented from starting by protection circuit, so to prevent further damage.
Check the speakers and speakers wiring, a contact in speaker wires, or faulty speakers can send the unit in protection.
Try unplugging power cable for one hour or so. then connect cable back
and see if you get rid of protect state. Sometimes accumulation of
electrostatic charges inside circuit capacitors can kick in protect
mode. In that case unplugging the unit from main for some times can get
rid of electrostatic charges, and reset circuits by draining power
If that was the problem, you will not get Protect when plugging back power cable.
If you do all the above and still get Protect, then there is a real fault.
In that case the unit may be disassembled and tested to find the fault.
If that is the case I suggest contacting the manufacturer at the number
listed on the owners manual, or asking a quote on repair to a local
The easiest way is to hook up your DVD/VCR combo directly to the back of your Sharp LCD TV, then run a component audio output from the TV to the audio input in the back of the receiver. Make sure you hook up your front, center and rear speakers correctly to the receiver, then go through with the speaker calibration steps - per manual, then it should work with no problem. Good luck! Marc
If you do not here a click as soon as the power is turned on, (note you must be in a very quite environment no noise absolutely to hear this) then the amplifier has blown output transistors which are pushing DC current to the speakers.