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Re: surround sound keeps shuting off
The system go to protect mode in case of trouble in output stage(power output component and cords and speakers. try to connect each speaker one by one until you find the bad one change cord first for the bad one and check if not working you must change speaker itself.if all above does not solve the problem you must pass your sony to service center
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If you are running at high volume for even a short period of time, the overload signal to the microprocessor(computer within your unit) will cause the unit to shut down. If you are running it that loud, try turning the level to 1/3 of your normal listening mode. If it runs, try to keep the volume with reason.
Knowledge Article C337191
Error: The message PROTECT or UNPLUG shows in the display.
Follow this procedure to troubleshoot when a PROTECT or UNPLUG error is displayed.
IMPORTANT: The top of the receiver must have proper ventilation to keep from over heating.
Reduce the volume level.
NOTE: If the receiver is played at the maximum volume level it may enter the PROTECT mode. Maximum volume listening will cause the receiver to run hot and drain the output capacitors.
If both the A and B speakers are being powered by the receiver at the same time, turn off the surround sound option.
If protect occurs only when using a DVD player, the sampling frequency may be set too high.
NOTE: Some receivers provide compatibility with the higher sampling frequencies through alternate connections. Consult the user manual for specific information.
Ensure the speaker wiring is not damaged and is properley connected to the back of the receiver and speakers.
If the issue is still unresolved after completing all of the troubleshooting steps, service may be required.
Created: Thu Sep 16 14:49 2004 | Last Modified: Wed Jan 11 09:02 2006 http://www.iq.sony.com/srvs/autoresponsev4.asp?id=337191
this is a protection circuit. When bypass mode then it means that something in the power supply module has failed and the unit then goes into protection mode to protect the board components. Your surround sound need service from a qualified tech. No other remedy.
Sony has protection in these receivers for two main reasons.
1 - Checking for DC voltages on the outputs to speakers. Not your particular problem.
2 - Excessive current being drawn from receiver on one or more of the speakers.
Number 2 should be your starting point in finding a solution. Put the volume level on Medium - 35 to 40 on the front panel. Now listen to all you speakers in turn. Any scratching noise will indicate a defective speaker. Remove this speaker from the receiver output and check again if the set goes into protection on high volume.
If you could not find any strange noises on the speakers, remove them one by one and test the set on high volume.
Never - attempt to disengage the protection on this amplifier. The only times we have found the amplifier to be defective with this protection error, it has done so no matter the volume level. Therefore I believe your problem to be a speaker or speakers.
Read your manual , there is a level setting for each channel as well as a test function. Also remember most media on pro-logic mode dont have to loud sound from the rear speakers. Only a forced mono mode may give you louder sound at the rear. Regards PSP
The unit may be experiencing an overload caused by a short circuit, internally or externally. Try disconnecting all the speakers, then turning up the volume. If nothing happens, connect one speaker at a time and turn up the volume to see if you get more sound. You may have a speaker that has shorted internally and this will help you discover the bad one. However, if when you have all the speakers disconnected, and the unit still goes into protection mode with the volume up, then there is a problem with the unit itself.
Hope this helps, and please rate my advice, good OR bad.