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Onkyo TX-SV828THX Protect message

Hooked up some speakers after not using for a while and when I turn unit on after a few seconds the display reads PROTECT. I did find a speaker wire that shorted, corrected, unplugged and replugged everything hoping to reset, but same condition. I only see 3 fuses in the box and they look fine. The users manual says to contact service center, but given the age of the box and can't find a local place to work on, hoping someone can help me here. It's a great unit, but I don't want to spend a lot given the age and just using at this stage to drive some in house speakers.

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  • Theobaas Mar 15, 2009

    Hooked up some speakers after not using for a while and when I turn unit on after a few seconds the display reads PROTECT. I did find a speaker wire that shorted, corrected, unplugged and replugged everything hoping to reset, but same condition. I only see 3 fuses in the box and they look fine. The users manual says to contact service center, but given the age of the box and can't find a local place to work on, hoping someone can help me here. It's a great unit, but I don't want to spend a lot given the age and just using at this stage to drive some in house speakers.



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Audio amplifier IC damaged need to be replaced

Posted on Aug 31, 2009

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Hi,,My onkyo tx-sv828thx problem was it shows "protect" sometimes.then after 2 to 3 second its back to normal operation. What do you think the problem?can i do it by myself? anyway,i am using...


The protect message appears when the current powering an amplifier inside the receiver goes beyond the safety limit or the amplifiers overheat. So just check the wiring and the speakers impedance with an ohmmeter - each should be above 6 ohms
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When I push ON button I see in display " protect" mode...


It could be a short in your speaker wire or the crossover in your speakers.

1) Turn off your unit and disconnect your speaker wires at the amp, if the protect is no longer displayed when the unit is turned back on, check the connections on the speakers. If you do not visually see a short on the speaker wire connection, turn off the unit and disconnect the wires at the speaker and isolate them so they do not touch then connect the speaker wires at the amp. Turn on the amp and see if the protect is on. If it is on, the wire has a short somewhere in the line. If the protect is off then suspect the speaker has a short in the voice coil or crossover.

2) If the protect is still on after you disconnect the speaker wires at the amp, it could be the power IC in the amp is shorted and needs to be replaced.

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It could be a short in your speaker wire or the crossover in your speakers.

1) Turn off your unit and disconnect your speaker wires at the amp, if the protect is no longer displayed when the unit is turned back on, check the connections on the speakers. If you do not visually see a short on the speaker wire connection, turn off the unit and disconnect the wires at the speaker and isolate them so they do not touch then connect the speaker wires at the amp. Turn on the amp and see if the protect is on. If it is on, the wire has a short somewhere in the line. If the protect is off then suspect the speaker has a short in the voice coil or crossover.

2) If the protect is still on after you disconnect the speaker wires at the amp, it could be the power IC in the amp is shorted and needs to be replaced.

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Sounds like you have either a short in your speaker wire somewhere, wires touching in the back of the unit or a short inside the stereo itself... Try pulling the radio out and unhooking all of your speakers...Turn unit back on after all speakers are disconected...If unit still shows protect, then radio is bad...If it doesnt, power off and hook up speakers one by one and power it back on till it shows protect again....When it does, the last speaker wire you hooked up has either a crossed wire or the speaker is bad...

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Hello grammagrisbo, hi your Kenwood head units will show "protect" when there's a problem with the speaker outputs so check to see if the impedance load meets your radio, 8ohms or 4 ohms?. having parallel two speakers on a single channel may cause this dilemma. This might also mean a shorted speaker wire, a blown speaker, or an internal defect in the head unit. Once the condition that's causing the "protect" mode is fixed, the CD player should be back to normal, the next time you turn it on.
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Pull the Kenwood unit from the dash and disconnect all the speaker wires. power it on and see if the "protect" message displays. If it does, the stereo has an internal defect and will need to be serviced. If it doesn't, then turn it off, and re-connect one speaker only. Turn it on again and see if it will displays "protect" message.

If the radio works with one speaker connected, connect the other speaker to the second channel, you may have now the idea where the problem begun, you will identify the speaker that's causing the problem. There may be a wiring problem or defective speaker in that channel.

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1 Answer

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The most common problem found on FixYa for Audio Video2_bing.gif Receiver's is:

My 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.

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Protect mode


To view your owners manual, click here:
http://bit.ly/daGF4N

Or here:
http://63.148.251.135/redirect_service.cfm?type=own_manuals&file=TXSV828THXom.pdf

You'll need to read it to find your answer.

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