"protect" display when volume is high and volume cuts in and out.

Just freq. error, by lowering the input
freq. can fix the problem.

Hi,

Did you check that all the connections are fine and that the cables are not damaged?

bad soldering joints inside the receiver or faulty speaker relay.

Does it have a cooling fan? if it does, then check its actually working. Protecton circuit maybe cutting in.

disconnect speakers turn up to 60 and see if cuts out if it does not cut out check your speakers

if what Dark_Orbit said does not work try doing a master reset by ressing and holding the dvr/vcr button and stand by button simultaneously. This would erase all your assignments so you would need to reassign all your sources hooked up to your onkyo.

Hold the VCR/DVR button in and press the ON/OFF Standby button. The display should briefly read CLEAR and then the unit switches off. If that clears protect mode, you'll need to redo the Audyssey and configuration setup as these will have been cleared by the reset.

You can download the manual from the link below: http://www.intl.onkyo.com/downloads/manuals/pdf/tx-ds787_manual_e.pdf c. Power On Volume This sets a designated volume setting for the TX-DS787 to be set every time that the power is turned on. This prevents the TXDS787 from being turned on while it is set to an extremely high volume and suddenly output very loud sounds. For the absolute volume display method, this can be set between min and max. For the relative volume display method, this can be set between ?? and 18 decibels. If you do not mind having the TX-DS787 turned on with its current volume setting, set this to "Last." Please update the question & let us know if the information given was useful to you - Good Luck!

the system protect is usually displayed when a condition of short or shorting is occurring in the speaker wiring or the voice coil of any of your speakers.... thte circuit of you reciever is trying to protect itself and you from a very costly repair,,,so it you have another set of speakers try to use them and see if the condition still exists and if it does the problem is in the output section of the receiver,,,and if the protect no longer exists you have fixed your problem,,,good luck

The overload board is failing.