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I have a SX-780 receiver. When I turn it on the protection circuit kicks in. In the past there was a shorting of the left channel which got fixed temporarily.

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  • calipsok Apr 30, 2008

    My dilemma now is trying to find a place that will attempt to fix it. Because it is so old, I can't find anyone that will guarantee they'll be able to fix it based on parts availability.

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This unit needs an overhaul. There are probably poor solder connections &/or defective parts inside. Expect a parts cost around $20-$40. Add in the local labor rate for the total cost. These are nice units and are worth the repair cost.
Dan

Posted on Apr 30, 2008

  • ABRsvcs Apr 30, 2008

    The parts are generic enough that there should not be a problem fixing this. I do this all the time. If the exact replacement transistor is not available anymore, there are substitues that are available.

    Dan

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No sound output from turntable on sx-780 receiver


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Dec 18, 2012 | Pioneer Sx 780 Stereo Receiver

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I have a Sony STR-DH810 7.1 channel receiver. Everytime I turned it on, it shows the channel for a while then turn to PROTECTOR the turn off by itself. How to fix this problem, thank you...


You must be having a power Amp output problem. There must be a short circuit in one of the amplifiers and that is triggering the protection mode to prevent speaker damage. You will need professional help for this since the circuit is complicated and so is the construction. Getting access to the under side of the circuit board for removal and replacement of the components is very difficult on all modern AV receivers.

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Denon AVR-589 Center Channel Fault: I have a Denon AVR-589 that goes into ASO / DC protection and I've narrowed it down to the Center Channel. Instead of cycling thru various voltages on startup before...


For something to trip the protection circuit, it must be shorting somewhere. My bet would be an output transistor or IC, but if you think they are good, a bad capacitor would also do the trick. If the top of any electrolytic looks odd or there is any stuff coming out of them replace them.
You might want to look at the "Bad Caps Forum" website, it lists known capacitor makes that are known to cause trouble. If you see any them replace them.

Mar 19, 2017 | Denon Audio Players & Recorders

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GOES INTO PROTECT MODE


Before you throw it in the garbage check all the speaker wires, if you have one strand of wire touching the case of the receiver that acts as a short to ground and will make it trip into protect intermittently.

First things first unplug all speaker wires and see if it turns off, if not reconnect them one by one until the unit goes off.

Hope this helps,

Thanks!

Jan 04, 2010 | Sony STR-DE597 Receiver

1 Answer

Everytime a loud noise happens on this receiver, it automatically shuts off. I know there is a protection circuit, but it happens 20 -30 times a day


true the protection circuit is tripping when it gets past a safe current level. You can't alter this level, but start by seeing the ohm readings on your speakers (and the switch on the back if it has one)(and if you have a wire shorting). Too low a reading will cause more current to flow and it to trip earlier. Extra speakers added on are a common source of this problem

Oct 27, 2009 | Yamaha R-V702 5.1 Channels Receiver

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My Denon AVR 2805,has a problem. In a few seconds after switching on, it automatically turns itself off. What is the cause of this problem? How can I fix it?


This unit is in what is termed :protect mode". This means that one or more of the amplifier channels has a rpoblem that was detected by the protection circuit inside and the unit has been shutdown to prevent further damage. This is often shorted output transistors or a defective amp pac for the surround channels. Expect a parts cost in the $50 range for this repair.

Dan

Oct 08, 2009 | Denon AVR-2805 Receiver

1 Answer

The amp protection circuit was actived - what should we do?


Remove all speaker wires from the receiver and turn it on.

If it still goes into protect, I'll bet the house that one of the channels is shorted out and it needs repair. This is a job for a pro.

If it doesn't go into protect, check for a short in the speaker wire or for a bad speaker.

Jan 28, 2009 | Onkyo TX-SR605 Receiver

1 Answer

Pioneer SX-450 Receive: Left Channel is not working. The reason is a short circuit (cable)on an Exi tof the Channel. Thank your.


Hello. Receiver is been repared. I was told that a transistor and some resistors falled aut.
Thank you for assistance.
Regards,
Vladimir

Nov 03, 2008 | Pioneer Audio Players & Recorders

1 Answer

Automatic Shut-Off


It is important to know just what attemps have been made to repair the receiver. What parts have been replaced, who fixed it (a service center or a freind or yourself)? If it has a bad channel and if just one bad part was missed and not replaced, you can burn up all the parts that have just been replaced.

When a receiver shuts off seconds after turing it on, this is known as the protect mode. Most of the time is has a shorted output channel causing this. Sometimes it can be caused by a transistor in the protect circuit shorting out when the channel that is shorted goes bad. Even after repairing the bad channel, it will still go into protect if the protect transistor is bad and has not been replaced. Many times a bad channel can still have some components in it that are bad after it appears to have been repaired. This is were experience working with these type of circuits comes in handy.

Let me know exactly what has been done with full details and I may be able to help you locate the current problem.

Dave

Jul 09, 2008 | JVC RX-9010V Receiver

1 Answer

Reads PROTECT on the display of my Onkyo TX-SV525 ???


HOWDY,         NOW YOU COULD TRY THIS ONE: POWER THE RECEIVER UP , THEN PUSH&HOLD !THE VIDEO 1 BUTTON, THEN TURN THE PIECE IN THE OFF (STANDBY MODE ) ,IT WILL SAY "CLEAR SO IT SHOULD BE BACK TO IT,S ORIGINAL FACTORY SPECIFICATION,S.

SUCCES !                              AMSTERDAMCOWBOY-HOLLAND-NOW FLORIDA! 4-EVER

Apr 28, 2007 | Onkyo TX-SV525 Receiver

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