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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.

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.




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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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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.

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Not familiar with this model but seems like the protection circuit is kicking in, this could be caused by an imbalance of Ohms between channels or a short. remove & check all speakers and cables for continuity or shorts, does the unit power on without speakers or in a different mode (surround off).
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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

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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.


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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.

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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.


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