Question about Yamaha RX-V800 Receiver

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Auto protect after operation of at least 6 years on daily basis as sound amplifier, the other day the auto protect mode shutdown the amp. I checked and rechecked my speaker wires to all speakers and unplugged the sub thinking it might be my problem. It ran a while then shutdown again, takes a long reset and now I muted after 5 mins operation and shutdown again. Does the auto protect get weak or the power amps? Or should I think new unit? J in colorado

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That is actually a sign that the reciever is bad. it usually means the amp is blown. Not in the sense that it wont work. But its overheating and thats where the problem lies. for this recieve it only costs 130 for the pcb board that goes bad. I know no one likes to hear that there stuff is broken. But when i worked for Square Trade i seen a few dozen of these units come through and it was always the amp which can still be serviced by yamaha. -Thanks Nate

Posted on Jun 14, 2008

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How intelligent is Pioneer's vsx amp/rec "power off" protecting mode? Hi, I would like to have an answer to the foregoing title in order to find out if it's worth repairing my Pioneer...


When you remove boards, you may be breaking a circuit somewhere that is causing the shutdown. Pioneer uses rear panel jacks for ground points a lot, and if even one of these screws is out it can cause it to shut down.

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Arcam A65 amplifier keep on go to standymode why?


Depending on the volume level and how many speakers you are driving factor into how the amp will react. Check the speaker wires for shorts, if okay! then we must look at the audio output stage, if the semiconductors are getting to hot, the satety circuits will cause a shutdown, if you run a pair of speakers the amp will run cooler, if you recently added more speakers that would explain the shutdown, if not! there is a problem in the audio output transistors and ic's that will need to be dealt with.

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Sony STR DE835 receiver - no sound from speakers and headphone jack


The problem is in the audio output semiconductors, they have shorted causing the fuses to blow and it is in auto protect mode to prevent further damage. I recommend a professional to assess.

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I just purchased a Yamaha RX-V667. To keep it simple for start, I attached two 4ohm speakers to the Front speaker terminals. I also changed the factory set speaker impedance to 6 omh option. I am noting...


I presume that your amplifier is not working after the impedance was changed. If the speaker connections had shorted while this was changed with the power ON then it is possible that the amplifier had encountered a fault with a higher current drain which had triggered it to a protection fault condition. The fault can be with your output drivers. Please check for short on the outputs fitted for both the channels. Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise which can be a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board. Maybe the protect circuit by itself is shutting off due to a faulty bias or there is a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the amplifier comes out of the protect mode then check for short on the speakers.

Oct 22, 2011 | Yamaha RXV667 Receiver

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Hi! I buyed a Stereo Panasonix SA-CH74 Model 14 years ago. It was a great thing. But I noticed a problem with it. After one or two years F61 error begun appearing on display and stereo switched off....


F61 usually means the amp has detected a short or a severe microprocessor error.

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 'nekkid'. 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.

Check for loose speaker connections at the speaker as another possible root cause for intermittent shutdown.

Aug 11, 2011 | Audio & Video Receivers

1 Answer

I have a KA-128 Integrated Amplifier Stereo system. Lately after it has been playing for a while the speaker seem to just turn off. The amplifier still works, is reading my media (Tuner or CD) but no...


The unnamed speaker turns off but you're SURE the amp still works? How so?

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 'naked'. 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.

Check for loose speaker connections at the speaker as another possible root cause for intermittent shutdown.

Jul 22, 2011 | Kenwood Audio & Video Receivers

1 Answer

Hello, My amplifier is switching over directly after start into protection mode. Do you know maybe why and a solution for this problem? Thanks in advance Brdgs Hirsch Tom


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 'naked'. 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.

Check for loose speaker connections at the speaker as a root cause for intermittent shutdown.

Apr 21, 2011 | Audio & Video Receivers

2 Answers

Very happy until loss of audio!!


If it affects all inputs and the headphones then it's amplification area has shut down...

No sound from any speaker; light around power switch is red
• Amplifier is in protection mode due to possible short
• Check speaker wire connections for shorts at receiver and speaker ends.

• Amplifier is in protection mode due to internal problems
• Contact your local Harman Kardon service center.


You could try a processor reset:

Processor Reset
In the rare case in which the unit’s operation or the displays
seem abnormal, the cause may involve the erratic
operation of the system’s memory or microprocessor.

To correct this problem, first unplug the unit from the
AC wall outlet and wait at least three minutes. After the
pause, reconnect the AC power cord and check the
unit’s operation. If the system still malfunctions, a system
reset may clear the problem.

To clear the AVR 235’s entire system memory including
tuner presets, output level settings, delay times and
speaker configuration data, press and hold the Tone
Mode Button5buttons for three seconds. The unit
will turn on automatically.

NOTE: Resetting the processor will erase any configuration
settings you have made for speakers, output
levels, surround modes and digital input assignments,
as well as the tuner presets. The unit will be returned
to the factory presets, and all settings for these items
must be reentered.

If the system is still operating incorrectly, there may
have been an electronic discharge or severe AC line
interference that has corrupted the memory or
microprocessor.

If these steps do not solve the problem, consult an
authorized Harman Kardon service center.

Mar 15, 2010 | Harman Kardon AVR 235 Receiver

1 Answer

The receiver says "overload, turn power off" and after a day of letting it set it won't turn on and repeats the message


This is a variant of the "protect" mode for receivers. This indicates that a problem was detected in the final stage of the output amplifier and the unit has shutdown to prevent further damage. The "fix" for this is to replace either the output transistors or the amp-pac. I don't know which variant is used in your specific model. If it is the output transistors, expect a parts cost in the $15-$30 range. If an amp-pac, the parts will run in the $75-$100 range. Dan

Jun 09, 2009 | Panasonic SA-HE200 Receiver

1 Answer

Random shutting down


This answer is generic to most sound system amplifiers:

Check to see if the speakers are too low impedance for your unit. For example, if you have 4 ohm speakers and the system is rated for 8 ohms only, it can go in to protect mode (shut-down). If you are running 2 sets of speakers at the same time, and the total load impedance is equal to less than the spec of the amplifier, this can cause a safety shutdown.

The output stage power devices (transistors or IC's) can be going over temperature. This you will not be able to feely with your hand unless it was extremely severe.

It is possible that there is a component(s) that have become thermo sensitive, and when reaching normal operation they go out of specs. It is also possible that there is a cold solder connection and with thermo expansion from the normal increase of temperature, there is a loss of contact and the amplifier goes in to protection.

One other thing I have seen, is where the customer uses the amplifier excessively loud where there is some distortion. This causes some clipping in the sound. Sometimes the distortion can be very low to the point where to the listener the sound appears to be clean sounding. After some time, the amplifier will be triggered in to protection. If this is the case, you need a higher powered amplifier, or more efficient speakers, and or both.

You should get this checked if your connections to the speakers are compliant to the spec of the amplifier.

Jerry G.


Apr 18, 2008 | Onkyo TX-SR875 Receiver

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